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Wyświetlanie 1-99 z 99
Tytuł:
PDGF-BB homodimer serum level – a good indicator of the severity of alcoholic liver cirrhosis
Autorzy:
Kurys-Denis, E.
Prystupa, A.
Luchowska-Kocot, D.
Krupski, W.
Bis-Wencel, H.
Panasiuk, L.
Powiązania:
https://bibliotekanauki.pl/articles/2085441.pdf
Data publikacji:
2020
Wydawca:
Instytut Medycyny Wsi
Tematy:
alcohol
liver cirrhosis
Child-Pugh score
platelet derived growth factor AA
platelet growth factor AB
platelet derived
growth factor BB
Opis:
Introduction. Liver cirrhosis is a chronic disease in which progressive fibrosis is noted. This process leads to changed architectonics of the liver parenchyma and the appearance of regenerative nodules, all of which are caused by pathological activation of the hepatic stellate cells. This process is enhanced on a molecular level by many cytokines, with platelet-derived growth factors (PDGFs) playing the key role. Objective. The aim of the study was to assess serum concentrations of PDGFs active biodymers (PDGF-AA, PDGF-BB and PDGF-AB) in patients with alcoholic liver cirrhosis, and to correlate them with the stage of disease. Materials and method. 64 patients with alcoholic cirrhosis and a control group of 16 healthy individuals were analysed. Liver cirrhosis was determined based on clinical image, history of the patients’ alcohol consumption, laboratory findings and abdominal ultrasonography. The serum PDGF-AA, PDGF-BB and PDGF-AB concentrations were determined using ELISA kits. Results. Serum concentration of PDGF-AA and PDGF-BB homodimers increases in patients with alcoholic liver cirrhosis (p=0.034 and p<0.0001, respectively), unlike the serum concentration of PDGF-AB heterodimer (p>0.05). When the stage of the disease increases, the concentrations of PDGF-AA and PGFD-BB in blood also oncrease. Furthermore, the serum level of both PDGF-AA and PDGF-BB correlates significantly with the severity of alcoholic liver cirrhosis (measured by Pugh-Child’s scale), the correlation being stronger in the case of PDGF-BB levels than PDGF-AA (R=0.28; p=0.027 and R=0.26; p=0.038, respectively). Conclusions. The plasma levels of PDGF-AA and -BB may be indicators of alcohol-induced liver fibrosis process, and might be considered as future possible treatment targets, with PDGF-BB levels being an even better indicator than PDGF-AA levels.
Źródło:
Annals of Agricultural and Environmental Medicine; 2020, 27, 1; 80-85
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FGF binding by extracellular matrix components of Whartons jelly
Autorzy:
Malkowski, Andrzej
Sobolewski, Krzysztof
Jaworski, Stefan
Bankowski, Edward
Powiązania:
https://bibliotekanauki.pl/articles/1041086.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
umbilical cord
fibroblast growth factor
metalloproteinases
Opis:
Our earlier paper has reported that Wharton's jelly is a reservoir of several peptide growth factors, including acidic and basic fibroblast growth factors (aFGF and bFGF, respectively). Both can be extracted by buffered salts solutions in the form of high molecular mass complexes, probably with a component(s) of the extracellular matrix. Both aFGF and bFGF from such extracts hardly penetrate 10% polyacrylamide gels during electrophoresis. Pre-treatment of Wharton's jelly with hyaluronidase slightly increased the extractability of aFGF, but did not affect the extractability of bFGF. In contrast, the pre-treatment of tissue homogenate with bacterial collagenase (2000 U/ml, 37°C, 18 h) increased the extractability of bFGF. The presence of β-mercaptoethanol in the extracting solutions increased the extractability of both FGFs, but did not release FGFs in their free form, despite reducing the molecular mass of the FGF-containing complexes. We conclude that both aFGF and bFGF are bound through disulphide bonds to a protein component of Wharton's jelly. We propose that ground substance composed mainly of collagen fibrils and hyaluronate molecules, which surrounds the cells of Wharton's jelly, prevents the access of the extracting solution to aFGF and bFGF. Although hyaluronate and collagen do not bind aFGF or bFGF directly, they may constitute a barrier which prevents the dispersion of FGFs in Wharton's jelly. Thus, the high concentration of FGFs around the cells of Wharton's jelly may facilitate the interaction of these factors with membrane receptors, thereby resulting in stimulation of cell division and differentiation, as well as of the synthesis of extracellular matrix components.
Źródło:
Acta Biochimica Polonica; 2007, 54, 2; 357-363
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Differential expression of epidermal growth factor and transforming growth factor beta isoforms in dog endometrium during different periods of the estrus cycle
Autorzy:
Bukowska, D.
Kempisty, B.
Jackowska, M.
Wozna, M.
Antosik, P.
Piotrowska, H.
Jaskowski, J.M.
Powiązania:
https://bibliotekanauki.pl/articles/30107.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
expression
epidermal growth factor
transforming growth factor-beta
isoform
dog
endometrium
different period
oestrous cycle
Opis:
Both epidermal growth factor (EGF) and transforming growth factor (TGF) play an important physiological role in the processes of proliferation and differentiation of several different cell types. However, the expression profiles of these factors in domestic bitches endometrium are still poorly recognized. The aim of the present study was to identify and analyze the differential expression of these factors in various stages of the estrus cycle. Endometrial tissue from proestrus (n=17), estrus (n=10), day 10 diestrus (n=15), day 35 diestrus (n=18) and anestrus (n=25) was collected soon after ovariohysterectomy. Total RNA was isolated from the endometrium by means of Chomczyński and Sacchi method, treated by DNase I, and reverse- transcribed into cDNA. Quantitative analysis of EGF, TGFβ1, TGFβ2, and TGFβ3 cDNA was performed by real-time quantitative polymerase chain reaction (RT-PCR). EGF expression in canine endometrium was increased in the estrus stage as compared to proestrus (P<0.05), day 10 diestrus (P<0.05), day 35 diestrus (P<0.01) and anestrus (P<0.001). We also found the differences in EGF expression between day 10 and day 35 of estrus as well as between day 35 of estrus with anestrus (P<0.05, P<0.01, respectively). The TGFf1 transcript contents were also higher in estrus as compared to other stages (P<0.01). The TGFβ2 and TGFβ3 in the estrus stage was increased compared to proestrus, day 10 diestrus, day 35 diestrus and anestrus (P<0.05). We proved that expression of EGF and TGFβ transcript isoforms is related to the phase of estrus in bitches and therefore may be regulated by specific hormone concentrations during these periods. Our results confirm the hypothesis that these growth factors play a role in the regulation of biochemical changes in the endometrial tissues during the estrus cycle.
Źródło:
Polish Journal of Veterinary Sciences; 2011, 14, 2
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The potential impact of the hypovitaminosis D on metabolic complications in obese adolescents - preliminary results
Autorzy:
Wójcik, Małgorzata
Janus, Dominika
Kalicka-Kasperczyk, Anna
Sztefko, Krystyna
Starzyk, Jerzy B.
Powiązania:
https://bibliotekanauki.pl/articles/986678.pdf
Data publikacji:
2017
Wydawca:
Instytut Medycyny Wsi
Tematy:
obesity
hypovitaminosis d
uric acid
arterial hypertension
fibroblast growth factor 23
fibroblast growth factor 19
adolescents
Opis:
Introduction and objective. Vitamin D deficiency is common in obesity; however, its contribution in the development of metabolic complications remains uncertain. The aim of the study was to examine the relationships between vitamin D status and metabolic complications. Materials and method. The results of blood pressure measurements, biochemical tests and ultrasound of the liver were compared in both groups. The study was conducted at the Children’s University Hospital in Krakow, Poland. 30 obese adolescents (mean 13.23y.o.); 18 with 25OHD levels <20ng/mL, 12 with 25OHD>20 ng/mL. Results. The vitamin D deficient group presented with significantly higher values of the diastolic blood pressure (125.9vs.115mmHg), uric acid level (384.7vs.301.5umol/L) and lower phosphorus level (1.4vs.1.65mmol/L), higher prevalence of arterial hypertension (44vs.8.3%), and liver steatosis (25vs.8.3%); lower, but not significantly, levels of fibroblast growth factor 23 and fibroblast growth factor 19. Conclusions. Hypovitaminosis D in obese adolescents is associated with higher prevalence of arterial hypertension, liver steatosis, elevated serum uric acid and low phosphorus levels. The potential contribution of the fibroblast growth factor 23 and fibroblast growth factor 19 in these complications development needs further investigation.
Źródło:
Annals of Agricultural and Environmental Medicine; 2017, 24, 4
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
IGF-I and IGF-binding proteins in synovial fluid of patients with Lyme arthritis
Autorzy:
Bączyk, J.
Guszczyn, T.
Romanowicz, L.
Pancewicz, S.
Moniuszko, A.
Popko, J.
Powiązania:
https://bibliotekanauki.pl/articles/1917714.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Insulin-like Growth Factor-I
Insulinlike Growth Factor-Binding Protein
metalloproteinase
synovial fluid
Lyme arthritis
post-traumatic damage
Opis:
Purpose: Multiple cellular functions are stimulated by a Insulin-like Growth Factor-I (IGF-I). The biological activity of IGF-I is modulated by IGFbinding proteins (IGF-BPs) and at the same time, the availability of IGF-BPs may be regulated by the proteolytic activity of some metalloproteinases (MMPs). The aim of the present study was to compare the amounts of IGF-I and IGF-BPs in relation to the activity of MMP-9 in serum and knee synovial fluid from patients with Lyme arthritis (LA) and post-traumatic damage (PTD). Material and methods: Serum and synovial fluids were taken from knee joints of patients with PTD and LA. ELISA (for IGF-I assay), polyacrylamine gel electrophoresis following Western immuneblotting (for IGF-I and IGF-BPs expression), and zymography (for metalloproteinases detection), were used. Results: The concentration of IGF-I in serum and synovial fluid from LA patients were significantly lowered in comparison to PTD patients. Interesting, the synovial fluid /serum ratio of IGF-I concentrations was also lower in LA patients. Low expression IGF-BP3 and high activity of MMP-9 were detected in the LA synovial fluid. Conclusions: The high proteolytic activity of MMP- 9 results in a cleavage of both IGF-I and IGF-BP3 causing a decrease in content of these substances in LA synovial fluid. In addition, the reduction in IGF and IGF-BP amounts may affect the repair processes in joint tissues of LA patients. The low concentration of IGF-I and IGF-BP3 slows down the repair processes in the joint tissues of LA patients.
Źródło:
Progress in Health Sciences; 2016, 6(1); 49-56
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relation between expression of TNF alpha, iNOS, VEGF mRNA and development of heart failure after experimental myocardial infarction in rats
Autorzy:
Heba, G.
Krzeminski, T.
Porc, M.
Grzyb, J.
Dembinska-Kiec, A.
Powiązania:
https://bibliotekanauki.pl/articles/69900.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
nitric oxide synthase
tumour necrosis factor-alpha
cytokine
ischaemic myocardium
mRNA
thoracotomy
growth factor
rat
myocardial infarction
vascular endothelial growth factor
Źródło:
Journal of Physiology and Pharmacology; 2001, 52, 1
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of hydrazine derivatives of 3-formylchromones on angiogenic basic fibroblast growth factor and fibroblast growth factor receptor-1 in human melanoma cell line WM-115
Autorzy:
Łazarenkow, Andrzej
Michalska, Marta
Mirowski, Marek
Słomiak, Krzysztof
Nawrot-Modranka, Jolanta
Powiązania:
https://bibliotekanauki.pl/articles/1038629.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
angiogenesis
basic fibroblast growth factor
fibroblast growth factor receptor 1
human melanoma
hydrazone derivatives of benzo-γ-pyrones
Opis:
The hydrazine derivatives of benzopyrones remain an unexplored group of chemical compounds. This preliminary study investigates the influence of A-5, CH-3 and K-2 derivatives at concentrations of 1, 10, 100 nM and 1 μM on selected biochemical factors of a melanoma cell line WM-115, with regard to their potential angiogenic properties. The studied compounds were found to influence cell proliferation, as well as total protein, bFGF and FGFR1 concentration.
Źródło:
Acta Biochimica Polonica; 2017, 64, 3; 585-590
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Endocrine Responses to Physical Training and Tribulus Terrestris Supplememtation in Middle-Age Men
Autorzy:
Wilk, Michał
Michalczyk, Małgorzata
Chycki, Jakub
Czuba, Miłosz
Roczniok, Robert
Gołaś, Artur
Zając, Adam
Maszczyk, Adam
Powiązania:
https://bibliotekanauki.pl/articles/1054899.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
growth hormone
insulin-like growth factor
steroidal saponins
supplementation
testosterone
Opis:
The aim of this study was to evaluate the effects of steroidal saponin supplementation on blood concentration of T, GH and IGF-1. The research involved 14 men between the age of 45 and 60 years. The duration of the experiment was 12 weeks. There were two series of laboratory tests. Independent tests were conducted at the beginning and after 12 weeks of the intervention. A two-way repeated measures ANOVA revealed a statistically significant effect of the intervention on the following variables: T-Ch (η2 = 0.542), HDL-Ch (η2 = 0.522), LDL-Ch (η2 = 0.587), T (η2 = 0.603), IGF-1 (η2 = 0.512) and GH (η2 = 0.621). Thus, FFM significantly increased while TBF and BM decreased in comparison to pre-intervention levels. The analyzed results indicate that treatment or supplementation of individual hormone deficiencies can be a successful form of counteracting the aging process. Nevertheless, the effects of TT supplementation on the concentration of T as well as GH and IGF-1, requires further studies, especially in middle-aged and older subjects, along with different exercise programs. The analyzed results indicate that treatment or supplementation of individual hormone deficiencies can be a major form of counteracting the aging process.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2016, 13, 1; 65-71
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potential role of transforming growth factor β1 in drug resistance of tumor cells.
Autorzy:
Stoika, Rostyslav
Yakymovych, Mariya
Souchelnytskyi, Serhiy
Yakymovych, Ihor
Powiązania:
https://bibliotekanauki.pl/articles/1043628.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
tumor cells
drug resistance
transforming growth factor b1
Opis:
Acquired drug resistance of tumor cells is frequently observed in cancer patients undergoing chemotherapy. We studied murine leukemia L1210 cells sensitive and resistant to the cytotoxic action of cisplatin and showed that cisplatin-resistant leukemia cells were also refractory to TGF β1-dependent growth inhibition and apoptosis. Addressing the question about the mechanisms responsible for the cross-resistance to cisplatin and TGF β1, we found that cisplatin- and TGF β1-resistant L1210 cells possessed a decreased expression of type I TGF β1 receptor, while the expression of type II TGF β1 receptor was not affected. Western blot analysis of Smad proteins 2, 3, 4, 6, and 7, which participate in signal transduction pathway down-stream of the TGF b1 receptors, revealed an increased expression of Smad 6, inhibiting TGF b1 action, only in cisplatin- and TGF β1-resistant L1210 cells. TGF β1 and especially the cytotoxic mistletoe agglutinin increased Smad 6 expression in TGF β1-sensitive but not in TGF β1-resistant L1210 cells. TGF β1-resistant L1210 cells also differed from TGF β1-sensitive cells by the lack of expression of the pro-apoptotic p53 protein and higher level of expression of the anti-apoptotic Bcl-2 protein. Thus, the described co-expression of tumor cell refractoriness to an anti-cancer drug and to the inhibitory cytokine TGF β1 is accompanied by multiple changes in the TGF β1 signal transduction pathway and in other regulatory systems of the target cells. Besides, we found that various anti-tumor drugs and cytotoxic plant lectins increased the level of TGF b1 expression in both TGF β1-sensitive and -resistant L1210 cells. A hypothesis is proposed that TGF β1 can at least partly mediate the effect of cell-stressing agents and, thus, the development of TGF β1 resistance may be responsible for the appearance of tumor cell refractoriness to the action of some anti-cancer drugs.
Źródło:
Acta Biochimica Polonica; 2003, 50, 2; 497-508
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of serum and tissue magnesium, Vascular Endothelial Growth Factor and osteopontin levels in dogs with mammary tumor with/without pulmonary metastases and in healthy dogs
Autorzy:
Gunay Ucmak, Z.
Koenhemsi, L.
Ucmak, M.
Yalcin, E.
Gonul, R.
Ates, A.
Powiązania:
https://bibliotekanauki.pl/articles/1192810.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
canine mammary tumor
magnesium
osteopontin
vascular endothelial growth factor
Opis:
Mammary tumors in female dogs are usually malignant and tend to metastasize to distant organs, especially to regional lymph nodes and lungs. Radiography is the standard diagnostic method to detect pulmonary metastases in these animals. Magnesium (Mg), vascular endothelial growth factor (VEGF), and osteopontin (OPN) levels have been used in recent studies to make prognoses of human breast cancer. To the best of our knowledge, however, there are not many studies that have been performed on this subject, and there is no study on animals in which the three indicators are scrutinized together. The aim of this present study is to evaluate Mg, VEGF, and OPN levels in healthy dogs and in dogs with mammary tumors with/without pulmonary metastases, and to investigate the alterations of these parameters in the serum and tissue samples of dogs with mammary tumors in connection with the histological tumor type and tumor grade. Mammary tumor groups were designed according to the presence of pulmonary metastasis in radiography; group M1 consists of 20 dogs with metastatic mammary tumors to the lung, and group M0 consists of 20 dogs with nonmetastatic mammary tumors. Ten clinically healthy dogs composed group H. The dogs represented different breeds and ages. Threeview thoracic radiographs were taken to determine any metastasis in lungs by digital radiography. Magnesium, VEGF, and OPN were determined in the mammary gland samples and blood serum of 40 dogs with malignant mammary tumors and in 10 healthy dogs. The magnesium levels were measured by atomic absorption spectrophotometry, both in the tissue and serum samples. Also, the tissue and serum VEGF and OPN levels were determined by ELISA with commercially available kits. The tissue Mg levels in the M0 group were significantly (P<0.05) higher than in group H. However, the serum VEGF level was significantly associated with a tumor type. Additionally, the serum OPN levels exhibited a tendency to be higher in dogs with mammary tumors with pulmonary metastases, grade 3, and carcinosarcoma. It is concluded that Mg, VEGF, and OPN could have practical use for diagnosing and understanding the pathophysiology of CMT.
Źródło:
Journal of Elementology; 2021, 26, 1; 125-135
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vascular Endothelial Growth Factor and Survivin Immunostaining in Gastric Adenocarcinoma
Autorzy:
Bury, Jarosław
Szumiło, Justyna
Dąbrowski, Andrzej
Ciechański, Aleksander
Śliwińska, Justyna
Wallner, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/1396680.pdf
Data publikacji:
2012-07-01
Wydawca:
Index Copernicus International
Tematy:
vascular endothelial growth factor
VEGF
survivin
adenocarcinoma
stomach
survival
Opis:
Two molecules - vascular endothelial growth factor involved in new vessels formation and survivin - antiapoptotic protein, reported to be associated with worse prognosis in various malignancies have been chosen for the study. Both are potential target for novel therapiesThe aim of the study was to determine the immunostaining of VEGF and survivin in gastric carcinoma and to analyse their relationship to the selected clinicopathological features and survival.Material and methods. Formalin-fixed, paraffin-embedded sections from 41 gastric adenocarcinomas were used for immunohistochemical reaction with monoclonal antibodies against vascular endothelial growth factor and survivin. The results were compared with selected clinicopathological features and survival.Results. Positive immunohistochemical reaction for vascular endothelial growth factor and survivin was revealed in 24 (58,53%) and 30 (73,17%), gastric carcinomas respectively. Vascular endothelial growth factor-negative gastric carcinomas were significantly more common in cases without metastases to regional lymph nodes and distant organs and in less advanced cases. Similar, distant metastases were also statistically less common in survivin-negative carcinomas. The differences in immunohistochemical reactions for survivin between less and more advanced cases almost reach statistical significance. The only factors significantly influenced 1, 2 and 3-year survival were vascular endothelial growth factor and survivin status. Statistically significant higher percentage of survival was noted in patients with vascular endothelial growth factor- and survivin-negative tumors.Conclusions. It seems that vascular endothelial growth factor and survivin play role in local invasion and spread of gastric adenocarcinoma and negatively influences survival. However, further studies are required to assess their true usefulness in the clinical practice.
Źródło:
Polish Journal of Surgery; 2012, 84, 7; 341-347
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of undecanones and their derivatives on tumor angiogenesis and VEGF content
Autorzy:
Gibka, J
Wasiutynski, A.
Skopinska-Rozewska, E.
Siwicki, A.K.
Chorostowska-Wynimko, J.
Sommer, E.
Mazurkiewicz, M.
Glinski, M.
Skurzak, H.
Wojcik, R.
Jung, L.
Powiązania:
https://bibliotekanauki.pl/articles/31734.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mice
mouse
undecan-x-one
derivative
angiogenesis
tumour
VEGF zob.vascular endothelial growth factor
enantiomer
histological examination
vascular endothelial growth factor
sarcoma cell
Opis:
The in vivo effects of some derivatives of aliphatic ketones (2-undecanone, 3-undecanone, 4-undecanone and their derivatives) on L-l sarcoma tumor angiogenesis and VEGF content were studied in Balb/c mice. Mice that inhaled 10% solution of 3-undecanone(3-on) or 1% solution of 2-undecanone propylene acetal (Acpr2) for 3 days after tumor cells implantation, presented lower neovascular response measured by tumor-induced cutaneous angiogenesis test (TIA) and lower tumor VEGF content in 5-days tumors, than non-inhaled controls. Other substances presented various effects on tumor VEGF concentration and angiogenesis. Histological examination of lesions collected from mice inhaled Acpr2, or non-inhaled controls, revealed small diffused areas of necrosis in the former group. In both groups, slight to moderate inflammatory infiltrations were seen at the tumor's margin. In Acpr2 group, there were less small blood vessels at tumor's margin than in the control group.
Źródło:
Polish Journal of Veterinary Sciences; 2010, 13, 1; 105-115
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carbon monoxide - a "new" gaseous modulator of gene expression.
Autorzy:
Dulak, Józef
Józkowicz, Alicja
Powiązania:
https://bibliotekanauki.pl/articles/1043644.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
angiogenesis
vascular endothelial growth factor
atherosclerosis
nitric oxide
oxidative stress
Opis:
Carbon monoxide (CO) is an odorless, tasteless and colorless gas which is generated by heme oxygenase enzymes (HOs). HOs degrade heme releasing equimolar amounts of CO, iron and biliverdin, which is subsequently reduced to bilirubin. CO shares many properties with nitric oxide (NO), an established cellular messenger. Both CO and NO are involved in neural transmission and modulation of blood vessel function, including their relaxation and inhibition of platelet aggregation. CO, like NO, binds to heme proteins, although CO binds only ferrous (FeII) heme, whereas NO binds both ferrous and ferric (FeIII). CO enhances the activity of guanylate cyclase although it is less potent than NO. In contrast, CO inhibits other heme proteins, such as catalase or cytochrome P450. The effects of CO on gene expression can be thus varied, depending on the cellular microenvironment and the metabolic pathway being influenced. In this review the regulation of gene expression by HO/CO in the cardiovascular system is discussed. Recent data, derived also from our studies, indicate that HO/CO are significant modulators of inflammatory reactions, influencing the underlying processes such as cell proliferation and production of cytokines and growth factors.
Źródło:
Acta Biochimica Polonica; 2003, 50, 1; 31-47
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of local injection with basic fibroblast growth factor (BFGF) and neutralizing antibody to BFGF on gastric ulcer healing, gastric secretion, angiogenesis and gastric blood flow
Autorzy:
Ernst, H.
Konturek, P.C.
Hahn, E.G.
Stosiek, H.P.
Brzozowski, T.
Konturek, S.J.
Powiązania:
https://bibliotekanauki.pl/articles/70161.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
epidermal growth factor
gastric ulcer
gastric blood flow
ulcer healing
basic fibroblast growth factor
gastric secretion
angiogenesis
chronic gastric ulcer
healing
antibody
Źródło:
Journal of Physiology and Pharmacology; 2001, 52, 3
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationships between serum selenium and zinc concentrations versus profibrotic and proangiogenic cytokines (FGF-19 and endoglin) in patients with alcoholic liver cirrhosis
Autorzy:
Prystupa, Andrzej
Kiciński, Paweł
Luchowska-Kocot, Dorota
Błażewicz, Anna
Kurys-Denis, Ewa
Niedziałek, Jarosław
Sak, Jarosław
Panasiuk, Lech
Powiązania:
https://bibliotekanauki.pl/articles/990858.pdf
Data publikacji:
2017
Wydawca:
Instytut Medycyny Wsi
Tematy:
liver cirrhosis
alcohol
selenium
zinc
fibroblast growth factor-19
endoglin
Opis:
Introduction and objective. Liver cirrhosis is a disease involving the liver parenchyma, which is characterised by fibrosis. and impaired architectonics of the parenchyma with regenerative nodules. The aim of the study was to determine the relationship between stage of alcoholic liver cirrhosis, concentrations of selenium, zinc and profibrotic and proangiogenic cytokines (FGF-19, ENG). Materials and method. The study included 99 patients with alcoholic cirrhosis and 20 healthy subjects. Ion chromatography with UV/VIS detection was used for determination of zinc ions in the previously mineralized serum samples. The measurements of selenium were performed with the ContrAA700 high-resolution continuum source graphite tube atomic absorption spectrometer. ELISA was used to determine concentration of FGF-19 and ENG in serum samples. Results. Concentrations of zinc and selenium were significantly decreased in cirrhotic patients (p<0.001 for both). The highest concentration of FGF-19 was found in Child-Pugh stage C liver cirrhosis patients (806.9±650.3 pg/ml), and was significantly higher than observed in controls (p=0.005) and stage A patients (compensated cirrhosis) (p=0.02). The highest concentration of ENG was demonstrated in the control group (3.24±148 ng/ml) while the lowest in patients with decompensated cirrhosis (7.32±5.39 ng/ml and 7.92±4.18 ng/ml for stage B and C; p=0.03 and p=0.02, respectively). The use of the multiple-variable model demonstrated that the independent factors affecting the concentration of ENG were the concentration of bilirubin (p=0.02), INR (p=0.01) and duration of alcohol abuse (p=0.02). The independent determinants of FGF-19 concentrations were found to be the stage (severity) of liver cirrhosis (p=0.04) and INR (p=0.03). Conclusions. Concentrations of zinc and selenium in serum of patients with alcoholic liver cirrhosis are not independently related to concentrations of FGF-19 and ENG.
Źródło:
Annals of Agricultural and Environmental Medicine; 2017, 24, 3
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effects of adenoidectomy of serum insulin-like growth factor-1 (IGF-1) and ghrelin in hypertrophied adenoids in children with otitis media with effusion
Autorzy:
Żelazowska-Rutkowska, Beata
Jacewicz, Klaudia
Kasprzycka, Edwina
Skotnicka, Bożena
Cylwik, Bogdan
Powiązania:
https://bibliotekanauki.pl/articles/1397400.pdf
Data publikacji:
2020
Wydawca:
Index Copernicus International
Tematy:
ghrelin
hypertrophied adenoid
insulin-like growth factor-1 (IGF-1)
Opis:
Aim: The aim of the current study was to assess the serum levels of insulin-like growth factor-1 (IGF-1) and ghrelin in hypertrophied adenoids in children suffering with or without otitis media with effusion before and after adenoidectomy. Material and methods: Serum IGF-1 and ghrelin concentrations were measured with specific enzyme-linked immunoassay (ELISA) methods. The study was carried out in 20 children with otitis media with effusion. The reference group comprised 24 children with hypertrophied adenoid, while control group included 19 children. Results: This mean values of IGF-1 in children with otitis media with effusion and children with hypertrophied adenoid before adenoidectomy were significantly lower than those found in healthy children. Serum levels of IGF-1 were higher after adenoidectomy. There was a significant difference of serum ghrelin levels between both examined groups and the control group. Conclusion: Our results suggest that adenoidectomy in children with hypertrophied adenoids and in children with otitis media with effusion significantly increases the level of IGF-1 in serum compared to before surgery through the effect of the GH-IGF-1 axis, which could contribute to children’s growth.
Źródło:
Polish Journal of Otolaryngology; 2020, 74, 4; 13-17
0030-6657
2300-8423
Pojawia się w:
Polish Journal of Otolaryngology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Expression of vascular endothelial growth factor and microvessel density in oral squamous cell carcinoma and its correlation with various clinico-pathological parameters
Autorzy:
Panigrahi, Ranjita
Jha, Narendra Kumar
Hota, Subhransu Kumar
Powiązania:
https://bibliotekanauki.pl/articles/38695726.pdf
Data publikacji:
2024-03-30
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
microvessel density
oral squamous cell carcinoma
vascular endothelial growth factor
Opis:
Introduction and aim. Angiogenesis, which is accomplished by capillary sprouting, is the process by which new vessels are created from pre-existing ones. In tumor, once their initial blood supply is depleted, a tumour is unable to grow without additional blood flow. Additionally, a tumor’s microvasculature, or microvessel density (MVD), increases along with its capacity to produce angiogenesis. We aimed to observe the relationship between the expression of vascular endothelial growth factor (VEGF) and MVD (using CD34) in oral squamous cell carcinoma (OSCC). Material and methods. The expression of VEGF and CD34 antibodies was analysed using immunohistochemistry method on 50 cases of histopathologically proved OSCC. The expression was correlated with clinicopathological parameters. Results. A significant correlation was observed between VEGF expression and gender, LVSI. No correlation between any other factors and the difference in VEGF expression was statistically significant. Similarly, the MVD expression was not found to be statistically significant in any of the pathological parameters. Conclusion. VEGF positivity as well as MVD were found to be independent of the tumor pathology. Tumor MVD was found to be independent of the expression of VEGF. Further studies in a larger study group may establish a significant association so that antiangiogenic targeted therapy may be initiated.
Źródło:
European Journal of Clinical and Experimental Medicine; 2024, 22, 1; 82-87
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of selective COX-2 inhibitor on phase of healing surgical wounds: proliferation and secretion of bFGF by endothelial cells
Autorzy:
Jasiak, Łukasz
Kowalczyk, Mateusz
Mazan, Paula
Kowalczyk, Edward
Sienkiewicz, Monika
Jóźwiak-Bębnista, Marta
Wiktorowska-Owczarek, Anna
Powiązania:
https://bibliotekanauki.pl/articles/763865.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
angiogenesis, selective COX-2 inhibitor, fibroblast growth factor, vascular endothelial cell
Opis:
The process of wound healing consists of the following phases: inflammation, proliferation, remodeling. Non-steroidal antiinflammatory drugs may be important in this process, especially in a stage called angiogenesis. For this reason, it was decided to investigate the effect of selective COX-2 (cyclooxygenase 2) inhibitor (NS-398) on the proliferation of endothelial cells and their ability to secrete bFGF (fibroblast growth factor) for vascular endothelial cells (HMEC-1). For determination of the secretion of bFGF in a cell line HMEC-1 immunosorbent ELISA assays were used. In turn, the cell proliferation assay was performed using the MTT method. Using MTT method, it was found that NS-398 at 10 μM did not affect cell viability. Whereas selective COX-2 inhibitor at 100 μM decreased cell viability in a statistically significant manner and inhibited the proliferative effect of 100 μg/mL LPS at concentrations of 10 and 100 μM. In the further step, application of NS-398 (10 and 100 μM) with LPS (100 μg/mL; inflammatory environment) reduced the secretion of bFGF in a statistically significant manner. The investigations showed that NS-398 has an antiangiogenic effect which is based on reducing the proliferation of vascular endothelial cells and inhibiting the secretion of bFGF- factor responsible for angiogenesis during wound healing.
Źródło:
Annales Universitatis Mariae Curie-Sklodowska, sectio C – Biologia; 2017, 72, 1
2083-3563
0066-2232
Pojawia się w:
Annales Universitatis Mariae Curie-Sklodowska, sectio C – Biologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of protoporphyrins on production of nitric oxide and expression of vascular endothelial growth factor in vascular smooth muscle cells and macrophages.
Autorzy:
Józkowicz, Alicja
Dulak, Józef
Powiązania:
https://bibliotekanauki.pl/articles/1043649.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
cell viability
metalloporphyrins
vascular endothelial growth factor
nitric oxide
heme oxygenase
Opis:
Heme oxygenase-1 (HO-1), an inducible enzyme degrading heme to biliverdin, iron and carbon monoxide, is involved in regulation of inflammation and angiogenesis. Tin protoporphyrin (SnPPIX) and zinc protoporphyrin (ZnPPIX) are commonly used as competitive inhibitors of HO-1. We aimed to compare the effects of SnPPIX and ZnPPIX on the production of vascular endothelial growth factor (VEGF), activity of inducible nitric oxide synthase (iNOS) and cell viability. All experiments were performed on rat vascular smooth muscle cells and murine RAW264.7 macrophages treated with 3-10 μM protoporphyrins. Some cells were additionally stimulated with IL-1β or with lipopolysaccharide. After a 24 h incubation period SnPPIX and ZnPPIX significantly reduced the generation of VEGF in vascular smooth muscle cells and RAW264.7, both in resting and stimulated cells. The inhibitory potentials of both protoporphyrins on VEGF synthesis were very similar. In contrast, analysis of iNOS activity revealed that results obtained with different HO-1 inhibitors are discrepant. Generation of nitric oxide by iNOS was significantly increased by SnPPIX but strongly decreased by ZnPPIX. Similar differences were observed when cell viability was compared. SnPPIX improved the cell survival rate, whereas the same doses of ZnPPIX exerted some cytotoxic effects. In summary, SnPPIX and ZnPPIX can be used as HO-1 inhibitors in some experimental models. However, these compounds produce also HO-independent effects, which can make the interpretation of experiments very uncertain. Thus the involvement of the HO-1 pathway should be always confirmed by more specific methods.
Źródło:
Acta Biochimica Polonica; 2003, 50, 1; 69-79
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hepatokines and non-alcoholic fatty liver disease
Autorzy:
Lebensztejn, Dariusz
Flisiak-Jackiewicz, Marta
Białokoz-Kalinowska, Irena
Bobrus-Chociej, Anna
Kowalska, Irina
Powiązania:
https://bibliotekanauki.pl/articles/1038763.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
non-alcoholic fatty liver disease
fetuin-A
fibroblast growth factor-21
selenoprotein P
sex hormone-binding globulin
angiopoietin-related growth factor
leukocyte derived chemotaxin 2
Opis:
Nowadays non-alcoholic fatty liver disease (NAFLD) is becoming the most common chronic liver pathology both in adults and children. NAFLD manifestation ranges from a simple liver steatosis to steatohepatitis (nonalcoholic steatohepatitis - NASH), which may progress to advanced fibrosis, cirrhosis and end-stage liver disease. Due to the coexistence of visceral obesity, insulin resistance and dyslipidemia, NAFLD is considered to be the hepatic manifestation of metabolic syndrome. In recent years, in the pathogenesis of metabolic syndrome, type 2 diabetes mellitus, cardiovascular disease and also NAFLD, more and more attention has been paid to the so-called organokines, proteins with both paracrine or/and endocrine activities. These include most known adipokines (mainly produced by adipose tissue), myokines (mainly produced by skeletal muscles) and hepatokines exclusively or predominantly produced by the liver. It was shown that the liver may affect the lipids and glucose metabolism by hepatokines released into the blood and NAFLD seems to be associated with altered hepatokines production. Fetuin-A, fibroblast growth factor-21 (FGF-21), selenoprotein P, sex hormone-binding globulin (SHBG), angiopoietin-related growth factor (also known as angiopoietin-related protein 6) and leukocyte derived chemotaxin 2 (LECT2) are considered as the most important hepatokines. In this review, we provide an overview of the main hepatokines and we summarize the association of liver-derived proteins with the development and progression of NAFLD.
Źródło:
Acta Biochimica Polonica; 2016, 63, 3; 459-467
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Binding of the basic fibroblast growth factor (bFGF) by soluble components of human umbilical cord.
Autorzy:
Sobolewski, Krzysztof
Bańkowski, Edward
Pałka, Jerzy
Jaworski, Stefan
Powiązania:
https://bibliotekanauki.pl/articles/1043707.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
umbilical cord artery
fibroblast growth factor
Wharton's jelly
pre-eclampsia
EPH-gestosis
Opis:
Pre-eclampsia, the most common pregnancy associated syndrome, is connected with remodelling of extracellular matrix of the umbilical cord tissues. Since the fibroblast growth factor (FGF) is known to be a stimulator of collagen and glycosaminoglycan biosynthesis, one may expect that it plays an important role in such a remodelling. Studies performed on the umbilical cords of 10 control and 10 pre-eclamptic newborns demonstrated that both the umbilical cord arterial wall and Wharton's jelly contain FGF mainly in complexes with the components of different molecular mass. Pre-eclampsia is associated with a decrease of endogenous FGF-binding by soluble high molecular mass components of the umbilical cord. It is suggested that FGF released from these complexes may be actively bound by fibroblasts of the umbilical cord, stimulating them to produce collagen and sulphated glycosaminoglycans.
Źródło:
Acta Biochimica Polonica; 2002, 49, 4; 999-1004
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Does senile impairment of cholinergic system in rats concern only disturbances in cholinergic phenotype or the progressive degeneration of neuronal cell bodies?
Autorzy:
Niewiadomska, Grażyna
Wyrzykowska, Jolanta
Chechłacz, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/1044354.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
cholinergic neurons morphology and phenotype
aging
nerve growth factor
plasticity
basal forebrain
Opis:
The trophic effect of continuous intraventricular infusion of nerve growth factor (NGF) on morphology of the basal forebrain (BF) cholinergic neurons was tested in 4- and 28-month-old male Wistar rats. All studies were conducted using behaviorally uncharacterized animals from the same breeding colony. Immunohistochemical procedure for choline acetyltransferase (ChAT) and p75NTR receptor has been applied to identify cholinergic cells in the structures of basal forebrain (BF). Using a quantitative image analyzer, morphometric and densitometric parameters of ChAT- and p75NTR-positive cells were measured immediately after cessation of NGF infusion. In 28-month-old non-treated rats the number of intensively ChAT-positive cells in all forebrain structures was reduced by 50-70% as compared with young animals. The remaining ChAT-positive cells appeared shrunken and the neuropil staining was markedly reduced. In contrast, the same neurons when stained for p75NTR were numerous and distinctly visible with perfect morphology. Analysis of Nissl stained sections also showed that 28-month-old rats did not display significant losses of neuronal cell bodies. NGF restored the number of intensely stained ChAT-positive cells to about 90% of that for young controls and caused a significant increase in size of those cells in 28-month-old rats as compared with the control, age-matched group. NGF did not influence the morphology of p75NTR-positive neurons, which were well labeled, irrespective of treatment and age of the rats. In 4-month-old rats, NGF infusion decreased the intensity of both ChAT and p75NTR immunostaining. These data provide some evidence for preservation of BF cholinergic neurons from atrophy during aging and indicate that senile impairment of the cholinergic system in rats concerns decrease in ChAT-protein expression rather than an acute degeneration of neuronal cell bodies. Treatment with NGF resulted in restoration of cholinergic phenotype in the BF neurons of aged rats. However, the present study also rises issue of possible detrimental effects of NGF in young normal animals.
Źródło:
Acta Biochimica Polonica; 2000, 47, 2; 313-330
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polymorphism of insulin-like growth factor (IGF-1) gene in Polish Lowland sheep from Podlaskie voivodship
Polimorfizm genu czynnika insulinopodobnego IGF-1 u polskich owiec nizinnych utrzymywanych w województwie podlaskim
Autorzy:
Niznikowski, R.
Czub, G.
Kaminski, J.
Nieradko, M.
Swiatek, M.
Glowacz, K
Slezak, M.
Powiązania:
https://bibliotekanauki.pl/articles/2890.pdf
Data publikacji:
2014
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
gene polymorphism
insulin-like growth factor
Polish Lowland breed
sheep
Podlasie voivodship
Opis:
Research was carried out on 432 Polish Lowland Sheep (405 ♀ and 27♂) of three varieties: Corriedale, Żelaźnieńska Sheep and Polish Lowland Sheep of Podlasie region. All animals were subjected to gene identifi cation factor insulin – IGF-1, in the assessment of alleles C and T. In conclusion it should be noted that in the three examined varieties of Polish Lowland Sheep showed no polymorphism in exon 3 of the insulin-like growth factor (IGF-1) gene, limiting its scope to determine the allele C, respectively genotype CC. This result indicates the need for further research in this area in “culture” sheep imported and adapted to Polish conditions and the production environment.
Polimorfizm genu czynnika insulinopodobnego IGF-1 u polskich owiec nizinnych utrzymywanych w województwie podlaskim. Badania przeprowadzono na materiale 432 polskich owiec nizinnych (405 ♀ i 27♂) trzech odmian: corriedale, owcy żelaźnieńskiej i polskiej owcy nizinnej regionu podlaskiego. Wszystkie zwierzęta były poddane identyfikacji genu czynnika insulinopodobnego IGF-1, w zakresie oceny występowania alleli C i T. Podsumowując, należy stwierdzić, iż u badanych trzech odmian polskich owiec nizinnych nie wykazano polimorfizmu występowania alleli i genotypów genu czynnika insulinopodobnego IGF-1, ograniczając jego zakres do ustalenie jedynie do allelu C i genotypu CC. Wynik ten wskazuje na potrzeby przeprowadzenia dalszych badań z tego zakresu u owiec kulturowych pochodzących z importu i adaptowanych do polskich warunkach środowiska produkcyjnego.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Animal Science; 2014, 53
1898-8830
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Animal Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The evaluation of the efficacy and toxicity of targeted treatment in non-small cell lung cancer patients – single centre experience
Autorzy:
Kardas, Joanna
Buraczewska, Agnieszka
Chrom, Paweł
Waśko-Grabowska, Anna
Młot, Beata
Szczylik, Cezary
Powiązania:
https://bibliotekanauki.pl/articles/773534.pdf
Data publikacji:
2017
Wydawca:
Medical Education
Tematy:
endothelial growth factor receptor
non-small cell lung cancer
tyrosine kinase inhibitor
Opis:
Introduction: Tyrosine kinase inhibitors (TKI) are the standard of treatment in patients with advanced non-small cell lung cancer (NSCLC) with EGFR (endothelial growth factor receptor) gene activating mutation. Objective: The evaluation of the efficacy and toxicity of TKI drugs in NSCLC patients treated in single centre. Material and methods: NSCLC patients treated with TKI (gefitinib, erlotynib, afatinib) between 2012– 2016 were retrospectively analysed. We evaluated: overall response rate (ORR) which is the sum of complete responses (CR) and partial remissions (PR), progression free survival (PFS), overall survival (OS) and adverse events (AE) according to CTCAE (Common Terminology Criteria for Adverse Events) scale. Results: The study group were 16 patients ORR was 50% (CR: 1, PR: 7). Median PFS and OS was 8,7 and 22,9 months respectively. Adverse events observed mainly in stage 1 and 2 were related to hyponatraemia, hyperbilirubinemia, skin toxicity and mucositis. There was one death reported due to infectious complications. Conclusion: The efficacy and toxicity of TKI in study group were found to be similar to those described in the literature.
Źródło:
OncoReview; 2017, 7, 2; 92-97
2450-6125
Pojawia się w:
OncoReview
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cardiovascular complications of selected antibodies used in oncological immunotherapy
Autorzy:
Kufel-Grabowska, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/1062897.pdf
Data publikacji:
2017
Wydawca:
Medical Education
Tematy:
bevacizumab
immunotherapy
monoclonal antibodies
pertuzumab
trastuzumab
trastuzumab-emtansine
vascular endothelial growth factor
Opis:
Immunotherapy supports other therapeutic methods and is an important element in the fight against cancer. Its main tasks include stimulation and guidance of the immune system to fight cancer, inhibition of the mechanisms that block the immune system, and direct destruction of neoplastic cells. Different from chemotherapy or hormonal therapy, its mechanism of action is associated with a different profile of adverse events. HER2 receptor inhibitors may cause symptoms of heart failure, which usually recede, once the treatment has been discontinued. Bevacizumab, an anti-VEGF antibody, induces numerous cardiovascular complications, including arterial hypertension, arterial embolism, haemorrhage and haemoptysis as well as venous thromboembolism.
Źródło:
OncoReview; 2017, 7, 2; 78-82
2450-6125
Pojawia się w:
OncoReview
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reciprocal regulation between nitric oxide and vascular endothelial growth factor in angiogenesis.
Autorzy:
Kimura, Hideo
Esumi, Hiroyasu
Powiązania:
https://bibliotekanauki.pl/articles/1043646.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
angiogenesis
vascular endothelial growth factor
hypoxia inducible factor 1
hypoxia
reciprocal regulation
nitric oxide
Opis:
Physiologically, angiogenesis is tightly regulated, or otherwise it leads to pathological processes, such as tumors, inflammatory diseases, gynecological diseases and diabetic retinopathy. The vascular endothelial growth factor (VEGF) is a potent and critical inducer of angiogenesis. The VEGF gene expression is regulated by a variety of stimuli. Hypoxia is one of the most potent inducers of the VEGF expression. The hypoxia inducible factor 1 (HIF-1) plays as a key transcription factor in hypoxia-mediated VEGF gene upregulation. Nitric oxide (NO) as well as hypoxia is reported to upregulate the VEGF gene by enhancing HIF-1 activity. The Akt/protein kinase B (PKB) pathway may be involved in NO-mediated HIF-1 activation in limited cell lines. There are some reports of negative effects of NO on HIF-1 and VEGF activity. These conflicting data of NO effects may be attributed mainly to the amount of released NO. Indeed, NO can be a positive or negative modulator of the VEGF gene under the same conditions simply by changing its amounts. The VEGF-mediated angiogenesis requires NO production from activated endothelial NO synthase (eNOS). Activation of eNOS by VEGF involves several pathways including Akt/PKB, Ca2+/calmodulin, and protein kinase C. The NO-mediated VEGF expression can be regulated by HIF-1 and heme oxygenase 1 (HO-1) activity, and the VEGF-mediated NO production by eNOS can be also modulated by HIF-1 and HO-1 activity, depending upon the amount of produced NO. These reciprocal relations between NO and VEGF may contribute to regulated angiogenesis in normal tissues.
Źródło:
Acta Biochimica Polonica; 2003, 50, 1; 49-59
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The associations between the growth hormone/insulin-like growth factor-1 axis, adiponectin, resistin and metabolic profile in children with growth hormone deficiency before and during growth hormone treatment
Autorzy:
Witkowska-Sędek, Ewelina
Rumińska, Małgorzata
Stelmaszczyk-Emmel, Anna
Majcher, Anna
Pyrżak, Beata
Powiązania:
https://bibliotekanauki.pl/articles/1038412.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
adiponectin
resistin
metabolic profile
growth hormone/insulin-like growth factor-1 axis
growth hormone deficiency
children
Opis:
This study investigated associations between the growth hormone/insulin-like growth factor-1 (GH/IGF-1) axis, adiponectin, resistin and metabolic profile in 47 GH-deficient children before and during 12 months of GH treatment. 23 short age-matched children without growth hormone deficiency (GHD) or any genetic or chronic disorders were recruited as controls at baseline. Metabolic evaluation included measurements of adiponectin, resistin, IGF-1, total cholesterol (total-C), low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), triglycerides (TG), glucose, insulin, glycated haemoglobin (HbA1c), thyroid stimulating hormone (TSH) and free thyroxine (free T4) concentrations. The GH-deficient children had significantly higher adiponectin (p<0.05) and total cholesterol (p<0.05) levels, and a significantly lower level of resistin (p<0.05) than the controls. Resistin at 6 months of GH treatment significantly correlated with changes in height SDS in that period (r=0.35) and with the level of fasting insulin (r=0.50), the HOMA-IR (r=0.56) and the QUICKI (r=-0.53) at 12 months of therapy. Adiponectin level at 12 months of GH treatment was significantly associated with changes in HDL-C within the first 6 (r=0.73) and within 12 (r=0.56) months of therapy, while resistin significantly correlated with an increment in IGF-1 within 12 months of treatment (r=0.49) and with total-C at 12 months (r=0.56). Untreated GH-deficient children had higher adiponectin and lower resistin levels than healthy short children without GHD. Adiponectin and resistin levels did not change significantly during the first 12 months of GH therapy. Good responders to GH treatment had a tendency for higher resistin level during GH therapy, which positively correlates with the insulin resistance parameters.
Źródło:
Acta Biochimica Polonica; 2018, 65, 2; 333-340
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary results of blood growth differentiation factor-9 (GDF-9) measurement in cats: future aspects of GDF-9 on stage of the cycle and spaying history
Autorzy:
Evkuran Dal, G.
Baykal, A.
Toydemir Karabulut, T.S.F.
Dokuzeylul Gungor, N.
Turna, O.
Powiązania:
https://bibliotekanauki.pl/articles/16539104.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
cats
growth differentiation factor 9
ovarian cycle
ovary
Opis:
Growth differentiation factor-9 (GDF-9), an oocyte-derived member of the TGF-β superfamily, plays an essential role in regulation of follicular development. This study aimed to determine the cyclic changes in serum GDF-9 concentration, compare its levels before and after ovariohysterectomy (OHE), and investigate its potential as a tool in ovarian remnant syndrome (ORS) diagnosis in cats. GDF-9 measurements were performed on 50 cats referred for routine OHE. The stage of the estrous cycle was determined by vaginal cytology and measurement of serum estradiol and progesterone levels was carried out to detect the cyclic changes in circulating GDF-9. One week after OHE, serum samples were collected again from 30 cats to reveal differences in GDF-9 levels. GDF-9 levels in the follicular phase were significantly higher than those in the interestrus (p<0.05). The postoperative analysis could be performed. GDF-9 levels slightly decreased one week after OHE (p=0.053). In conclusion, blood GDF-9 levels change during the estrous cycle, and may decrease with age in cats. However, further studies are needed to reveal the efficiency of GDF-9 in ORS diagnosis.
Źródło:
Polish Journal of Veterinary Sciences; 2022, 25, 1; 149-154
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of integrins and vascular endothelial growth factor isoforms mRNA expression in the canine uterus during perimplantation period
Autorzy:
Bukowska, D.
Kempisty, B.
Jackowska, M.
Wozna, M.
Antosik, P.
Piotrowska, H.
Jaskowski, J.M.
Powiązania:
https://bibliotekanauki.pl/articles/31799.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
integrin
vascular endothelial growth factor
isoform
mRNA expression
dog
uterus
pregnancy
bitch
Opis:
Integrins are the major receptors within the extracellular matrix (ECM) that mediate several functions connected with cell life and metabolism, such as cell adhesion, migration, cytoskeletal organization, proliferation, survival, and differentiation. A vascular endothelial growth factor (VEGF) is one of the most important angiogenic factors. It has been suggested that the expression of this gene may play crucial physiological roles in reproductive organs. All investigated endometrial tissues were isolated on day 10-12 after mating. Control bitches, used in this study, were in metestrus, which was determined according to the vaginal cytology and progesterone level in blood. Early pregnancy was verified by flushing the uterine horns with PBS. Total RNA was isolated from the bitches endometrium by means of the Chomczyński and Sacchi method, treated by DNase I, and reverse-transcribed into cDNA. A quantitative analysis of integrins α2b, β2 and β3, VEGF 164, 182 and 188 cDNA was performed by RT-PCR. In results we have shown an increased expression of all investigated genes (integrins α2b, β2 and β3, VEGF 164, 182, and 188) in pregnant bitches uterus as compared to non-pregnant females (P<0.001). Our results indicated that the expression of genes encoding integrins and vascular endothelial growth factors is different in relation to the time of the embryo implantation and it is increased in the first period of this process. This may be associated with the induction of specific mechanisms responsible for receptivity of uterus following the embryo attachment. In addition, all of investigated genes are up-regulated in a pregnancy-specific manner and the increased expression of these genes may regulate the uterus function during the implantation of canine embryos.
Źródło:
Polish Journal of Veterinary Sciences; 2011, 14, 2
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Clinical parameters of inflammatory bowel disease in children do not correlate with four common polymorphisms of the transforming growth factor β1 gene
Autorzy:
Liberek, Anna
Jakóbkiewicz-Banecka, Joanna
Kloska, Anna
Świderska, Joanna
Kmieć, Zbigniew
Łuczak, Grażyna
Wierzbicki, Piotr
Liberek, Tomasz
Marek, Krzysztof
Plata-Nazar, Katarzyna
Sikorska-Wiśniewska, Grażyna
Kamińska, Barbara
Węgrzyn, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/1039871.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
pediatric patients
gene polymorphism
Transforming growth factor β1
inflammatory bowel disease
Opis:
Transforming growth factor β1 (TGF-β1) is a cytokine affecting cell proliferation and development, which also has an immunomodulatory activity. Correlations between polymorphisms of the TGF-β1 gene and clinical parameters of inflammatory bowel disease (IBD) were reported previously in adults. Here, we tested whether such correlations occur in pediatric patients suffering from IBD. One hundred and four pediatric IBD patients were involved in this study. Among them, 36 were diagnosed with Crohn's Disease (CD) and 68 were diagnosed with ulcerative colitis (UC). The control group consisted of 103 children, in which IBD was excluded. TGF-β1 levels were determined in plasma and intestinal mucosa samples. The presence of the TGF β1 protein and the amount of TGF β1 mRNA were estimated in intestinal mucosa by immunohistochemistry and reverse transcription Real-Time PCR, respectively. Four common polymorphisms of the TGF-β1 gene were investigated: -800G/A, -509C/T, 869T/C and 915G/C. No significant correlation between TGF-β1 genotypes and (i) TGF-β1 levels in plasma and tissue samples, (ii) TGF-β1 gene expression efficiency in intestinal mucosa, (iii) IBD clinical parameters and (iv) inflammatory activity could be detected in children suffering from IBD. We conclude that, contrary to previous suggestions, the four common polymorphisms of the TGF-β1 gene do not influence the susceptibility to or clinical parameters of IBD in the tested population of children.
Źródło:
Acta Biochimica Polonica; 2011, 58, 4; 641-644
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pentoxifylline and its active metabolite lisofylline attenuate transforming growth factor β1-induced asthmatic bronchial fibroblast-to-myofibroblast transition
Autorzy:
Wójcik-Pszczoła, Katarzyna
Hińcza, Kinga
Wnuk, Dawid
Kądziołka, Dominika
Koczurkiewicz, Paulina
Sanak, Marek
Madeja, Zbigniew
Pękala, Elżbieta
Michalik, Marta
Powiązania:
https://bibliotekanauki.pl/articles/1038759.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
theophylline
pentoxifylline
lisofylline
transforming growth factor type β
fibroblast-to-myofibroblast transition
asthma
Opis:
Bronchial asthma is characterized by persistent airway inflammation and airway wall remodeling. Among many different cells and growth factors triggering changes in bronchi structure, transforming growth factor β1-induced fibroblast to myofibroblast transition is believed to be very important. The aim of this study was to evaluate whether theophylline (used in asthma therapy) and two other methylxanthines (pentoxifylline and its active metabolite lisofylline), may affect transforming growth factor β1-induced fibroblast to myofibroblast transition in bronchial fibroblasts derived from asthmatic patients. We show here for the first time that selected methylxanthines effectively reduce transforming growth factor β1-induced myofibroblast formation in asthmatic bronchial fibroblast populations. PTX was found to be the most effective methylxanthine. The number of differentiated myofibroblasts after PTX, LSF and THEO administration was reduced at least twofold. Studies on the use of methylxanthines opens a new perspective in the development of novel strategies in asthma therapy through their two-pronged, anti-inflammatory and anti-fibrotic action. In the future they can be considered as promising anti-fibrotic drugs.
Źródło:
Acta Biochimica Polonica; 2016, 63, 3; 437-442
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the frequency of the transforming growth factor beta-1 sequence polymorphisms in patients with alcohol dependence syndrome
Autorzy:
Augustyńska, Beata
Araszkiewicz, Aleksander
Woźniak, Marcin
Grzybowski, Tomasz
Skonieczna, Katarzyna
Woźniak, Alina
Żyła, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/1039134.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
transforming growth factor TGFβ-1
alcohol dependence syndrome
TGF-β1 gene
Opis:
Alcohol abuse is one of the most significant factors in the development of liver fibrosis. The pathomechanism of liver fibrosis is the same regardless of its etiology. Fibrosis is a sign of an imbalance between the synthesis of the extracellular matrix components and their degradation. Among the many cytokines that affect hepatic stellate cell activation it seems that transforming growth factor beta (TGF-β) is the most significant, either as the direct factor stimulating polymerase chain reaction (HSC) proliferation and transformation into myofibroblasts, or as the direct factor causing an increase in the activity of genes responsible for the synthesis of extracellular matrix components. The aim of the study was to reveal possible dependencies and differences between the presence of certain alleles of the TGF-β1 gene and its blood level in the study and control group. Blood samples were obtained from 39 patients, the control group consisted of 21 patients. The results obtained in the course of this study showed no statistically significant differences between the frequencies of particular polymorphisms. In the case of haplotype frequencies, insignificant differences were found for the algorithm Excoffier-Laval-Balding predicted haplotypes while one significant difference between the study and control groups was detected in case of the TC haplotype frequency predicted using the Expectation-Maximization algorithm. However, the difference in frequency of TC haplotype predicted by both algorithms was not significant. Genetic analysis of two single nucleotide polymorphisms (SNPs) in exon I of the TGF-β1 gene did not show significant differences between the occurrence of particular polymorphisms and haplotypes in the populations under study.
Źródło:
Acta Biochimica Polonica; 2015, 62, 1; 63-67
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elevated level of ambient glucose stimulates the synthesis of high-molecular-weight hyaluronic acid by human mesangial cells. The involvement of transforming growth factor β1 and its activation by thrombospondin-1
Autorzy:
Yevdokimova, Natalia
Powiązania:
https://bibliotekanauki.pl/articles/1041253.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
mesangial cells
high glucose
transforming growth factor β1
hyaluronic acid
thrombospondin-1
Opis:
The dysregulation of the metabolism of glycosaminoglycan and protein components of extracellular matrix (ECM) is a typical feature of diabetic complications. High glucose-induced enrichment of ECM with hyaluronan (HA) not only affects tissue structural integrity, but influences cell metabolic response due to the variety of effects depending on the HA polymer molecular weight. TSP-1-dependent activation of TGFβ1 axis is known to mediate numerous matrix disorders in diabetes, but its role concerning HA has not been studied so far. In this work we demonstrated that 30 mM D-glucose increased the incorporation of [3H]glucosamine in high-molecular-weight (> 2000 kDa) HA of medium and matrix compartments of human mesangial cultures. Simultaneously, the synthesis of HA with lower molecular weight and HA degradation were not altered. The cause of the increased high-molecular-weight HA synthesis consisted in the up-regulation of hyaluronan synthase (HAS) 2 mRNA without alterations of the expression of HAS3, which generates HA of lower molecular weight. D-Glucose at 30 mM also stimulated the production of transforming growth factor β1 (TGFβ1), the excessive activation of which was determined by the up-regulation of thrombospondin-1 (TSP-1). The blockage of TGFβ1 action either by neutralizing anti-TGFβ1 antibodies or by quenching the TGFβ1 activation (with TSP-1-derived synthetic GGWSHW peptide) abolished the effect of high glucose on HAS2 mRNA expression and normalized the synthesis of HA. Exogenous human TGFβ1 had the same effect on HAS2 expression and HA synthesis as high glucose treatment. Therefore, we supposed that TSP-1-dependent TGFβ1 activation is involved in the observed high glucose effect on HA metabolism. Since high-molecular-weight HA polymers, unlike middle- and low-molecular weight HA oligosaccharides, are known to possess anti-inflammatory and anti-fibrotic functions, we suppose that the enrichment of mesangial matrix with high-molecular-weight HA may represent an endogenous mechanism to limit renal injury in diabetes.
Źródło:
Acta Biochimica Polonica; 2006, 53, 2; 383-393
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Expression of RUNX2 and its signaling partners TCF7, FGFR1/2 in cleidocranial dysplasia
Autorzy:
Pawłowska, Elżbieta
Wójcik, Katarzyna
Synowiec, Ewelina
Szczepańska, Joanna
Błasiak, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/1039147.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
RUNX2
Wnt signaling
TCF7
fibroblast growth factor signaling
FGFR1
FGFR2
Opis:
RUNX2 is a member of the PEBP2/CBF transcription factors family controlling the expression of genes whose products are essential for bone formation. Mutations in the RUNX2 gene may be associated with cleidocranial dysplasia (CCD), a rare skeletal disease characterized by stature aberrations, delayed closure of the cranial sutures, hypoplastic or aplastic clavicles, and multiple dental abnormalities. As RUNX2 is involved in many signaling pathways, we hypothesize that CCD may be associated with their changes. We determined the expression of RUNX2 and its signaling partners TCF7, involved in canonical Wnt signaling, and fibroblast growth factor receptors, FGFR1 and FGFR2 in periodontum of CCD patients and control individuals. We did not observe any differences between the level of RUNX2, TCF7 and FGFR1/2 mRNA, determined by real-time PCR, in CDD patients and controls. Therefore, RUNX2 signaling pathways with their partners TCF7 and FGFR1/2 may not be involved in CCD pathogenesis.
Źródło:
Acta Biochimica Polonica; 2015, 62, 1; 123-126
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polymorphism of insulin-like growth factor IGF-1 gene in selected Polish sheep breeds
Polimorfizm genu insulinopodobnego czynnika wzrostu IGF-1 u wybranych polskich ras owiec
Autorzy:
Niznikowski, R.
Czub, G.
Swiatek, M.
Slezak, M.
Glowacz, K.
Powiązania:
https://bibliotekanauki.pl/articles/2986.pdf
Data publikacji:
2015
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
polymorphism
insulin-like growth factor 1
genotype
allele
selected breed
Polska
sheep
animal breed
Opis:
Polymorphism of insulin like growth factor IGF-1gene in selected Polish sheep breeds. Research was carried out in 2009-2013 on 1751 sheep bred in Poland (1366 ♀; 385♂) - 4 meat-wool breeds: Polish Merino, Old type Polish Merino, Corriedale and Żelaźnieńska sheep and 3 meat breeds (Berrichone du cher, Suffolk, Charolaise) from 34 flocks selected randomly across the country. All animals were subjected to identification factor insulin-IGF-1 gene, in the assessment of C and T alleles. Summing up, it should be noted that in 4 meat-wool breeds and 2 meat breeds (Berrichone du cher , Suffolk) there were no polymorphism of alleles and genotypes of insulin-like growth factor (IGF-1) gene, limiting its scope to determine C allele and CC genotype. Only one Charolaise ewe (breed imported from France) had T allele and C:T genotype. That result indicates the need for further research about sheep imported and adapted in Polish production conditions and assess the adaptation process.
Polimorfizm genu insulinopodobnego czynnika wzrostu IGF-1 u wybranych polskich ras owiec. Badania przeprowadzono na 1751 owcach ras hodowanych w Polsce (1366♀ i 385♂) – 4 ras wełnisto-mięsnych: merynos polski, merynos polski starego typu, corriedale i owca żelaźnieńska oraz 3 ras mięsnych (berrichone du cher, suffolk i charolaise) w latach 2009-2013, pochodzących z 34 stad wybranych losowo na obszarze całego kraju. Wszystkie zwierzęta poddane były identyfikacji genu czynnika insulinopodobnego IGF-1, w zakresie oceny występowania alleli C i T. Podsumowując, stwierdzić należy iż u badanych 4 ras wełnisto-mięsnych oraz 2 ras mięsnych (berrichone du cher i suffolk) nie wykazano polimorfizmu występowania alleli i genotypów genu insulinopodobnego czynnika wzrostu IGF-1, ograniczając jego zakres do ustalenia jedynie do allelu C i genotypu CC. U importowanej z Francji rasy charolaise stwierdzono odstępstwo od tej reguły tylko u 1 maciorki posiadającej allel T i genotyp C:T. Wynik ten wskazuje na potrzeby prowadzenia dalszych badań z tego zakresu u owiec pochodzących z importu i adaptowanych w polskich warunkach środowiska produkcyjnego, na podstawie którego można będzie ocenić zakres procesów adaptacyjnych.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Animal Science; 2015, 54[2]
1898-8830
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Animal Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Iodine supplementation activates folliculogenesis in rabbit ovary
Autorzy:
Abadjieva, D.
Petkova, M.
Grigorova, S.
Kistanova, E.
Powiązania:
https://bibliotekanauki.pl/articles/2087684.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ovary
growing rabbits
growth-differentiation factor 9
iodine supplement
Źródło:
Polish Journal of Veterinary Sciences; 2018, 21, 3; 559-566
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical model of endothelial cell proliferation and maturation
Autorzy:
Bajger, Piotr
Bodzioch, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/747425.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Angiogenesis, mathematical modelling, tumour growth, vascular endothelial growth factor
Angiogeneza, modelowanie matematyczne, wzrost guza, czynnik wzrostu sródbłonka naczyniowego.
Opis:
Angiogeneza jest jedna z cech charakterystycznych raka. Lepsze ilosciowe zrozumienie tego procesu pozwoliłoby na opracowanie skuteczniejszych terapii antyangiogennych. Postawiono hipoteze, ze nie tylko liczba komórek sródbłonka, ale takze jakosc układu naczyniowego, odgrywa wazna role w sposobie, w jaki chemio- iradioterapie sa dostarczane do guza. W zwiazku z tym rozwazamy minimalnie sparametryzowany matematyczny model proliferacji i dojrzewania komórek sródbłonka. Komórki sródbłonka dziela sie na dwa rodzaje - dojrzałe i niedojrzałe (lub proliferujace). Zakłada sie, ze komórki ulegaja samoistnemu dojrzewaniu, podczas gdy utracie jakosci naczyn krwionosnych posredniczy zewnetrzny czynnik wzrostu (tutaj VEGF). Rozwazany model został dopasowany do danych eksperymentalnych. Pokazuje on, w jaki sposób hamowanie VEGF prowadzi do lepszej jakosci układu naczyniowego i wolniejszej proliferacji.
Blood vessel sprouting (angiogenesis) is one of the hallmarks of cancer. Better quantitative understanding of this process would allow more effective antiangiogenic therapies to be developed. It has been hypothesised that not only the number of endothelial cells, but also the quality of the vasculature play an important role in how chemo- and radiotherapies are delivered to tumour site. Hence in this study a minimally-parametrised mathematical model of endothelial cell proliferation and maturation is developed. Endothelial cells are subdivided into two compartments -- mature and immature (or proliferating). The cells are assumed to undergo a self-mediated maturation, while loss of blood vessel quality is mediated by an external growth factor (here VEGF). The model is fitted to experimental data. The model shows how inhibition of VEGF results in better quality vasculature and slower proliferation.
Źródło:
Mathematica Applicanda; 2018, 46, 1
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ligands of peroxisome proliferator-activated receptor-γ increase the generation of vascular endothelial growth factor in vascular smooth muscle cells and in macrophages.
Autorzy:
Jozkowicz, Alicja
Dulak, Jozef
Piatkowska, Ewa
Placha, Wojciech
Dembinska-Kiec, Aldona
Powiązania:
https://bibliotekanauki.pl/articles/1044268.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
angiogenesis
ciglitazone
vascular endothelial growth factor
thiazolidinediones
prostaglandin-J2
peroxisome proliferator-activated receptor-γ
Opis:
Peroxisome proliferator-activated receptors-γ (PPARγ) are ligand-inducible transcription factors of the nuclear hormone receptor superfamily. We examined the effect of PPARγ activation on the generation of vascular endothelial growth factor (VEGF), one of the major angiogenic agents. Rat vascular smooth muscle cells (VSMC) and murine macrophages RAW264.7 were incubated for 24 h with PPARγ activators: prostaglandin J2 and ciglitazone. PPARγ were expressed in VSMC and RAW cells and their activity was upregulated in the presence of PGJ2 and ciglitazone. Incubation of the cells with PPARγ activators significantly augmented the release of VEGF protein into the media, both in resting and in IL-1β- or LPS-stimulated cultures. The higher protein generation was connected with the increased expression of mRNA and transcriptional activation of VEGF promoter. We conclude that the activation of PPARγ upregulates the generation of VEGF and may be involved in the regulation of angiogenesis.
Źródło:
Acta Biochimica Polonica; 2000, 47, 4; 1147-1157
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationship between receptors for insulin-like growth factor - I, steroid hormones and apoptosis-associated proteins in canine mammary tumors
Autorzy:
Dolka, I.
Motyl, T.
Malicka, E.
Sapierzynski, R.
Fabisiak, M.
Powiązania:
https://bibliotekanauki.pl/articles/32455.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
relationship
receptor
insulin-like growth factor
steroid hormone
apoptosis-associated protein
dog
mammary tumour
cancer
Opis:
In the veterinary literature there are few data concerning the expression of insulin-like growth factor type I (IGF-IR) in the canine mammary gland tumors. The aim of the present study was the evaluation of IGF-IR expression and its correlation to the expression of estrogen receptor α (ERα) and progesterone receptor (PR), proteins: Bcl-2, Bax, p53 in canine mammary gland tumors, and also a correlation with other features: bitch’s age, tumor diameter, histologic type of tumor, degree of histologic malignancy, proliferate activity. The study was done on 112 epithelial neoplasms: 21 (19%) were adenoma, 38 (34%) complex carcinoma (adenocarcinoma), 47 (42%) simple carcinoma (adenocarcinoma) and 6 (5%) solid carcinoma. Histochemistry and immunohistochemistry methods were employed. It was shown that more common and/or higher IGF-IR expression in cells of canine mammary gland tumors was related to the histologic type of cancer of worse prognostic (solid and simple carcinoma), high histologic degree of malignancy (IIIo) but the statistical analysis did not reveal any significant differences. We observed the high degree of IGF-IR expression in tumors which displayed the high ERα and PR expression. These results suggest the involvement of IGF-IR in the development of hormonosensitive canine mammary tumors. Additionally, the significant positive correlation between expression of IGF-IR and p53, Bax was found. Our study provides some evidence that interactions exist between the IGF-IR and these apoptosis-associated proteins may contribute to the development and progression of canine mammary gland tumors. These results require further investigations.
Źródło:
Polish Journal of Veterinary Sciences; 2011, 14, 2
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of physical activity on IGF-1 and IGFBP levels in the context of civilization diseases prevention
Autorzy:
Majorczyk, M.
Smolag, D.
Powiązania:
https://bibliotekanauki.pl/articles/871756.pdf
Data publikacji:
2016
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
physical activity
insulin-like growth factor 1
human disease
civilization disease
rheumatic disease
cardiovascular disease
prevention
Opis:
Background. Insulin-like growth factor 1 (IGF-1) is known as somatomedin C. This polypeptide hormone is functionally and structurally similar to insulin. IGF-1 effects on tissue by the IGF-1R and the insulin-like growth factor-binding protein also known as IGFBP. Abnormal IGF-1 and IGFBP signaling are positively correlated with a high risk of selected civilization diseases development. Physical inactivity is a one of the main causes of majority of chronic diseases and it is associated with eg. IGF-1 and IGFBPs level. Objective. The aim of the study was to explanation the effect of physical activity on IGF-1 and its binding protein – IGFBPs concentration in the context of selected civilization diseases prevention. The review of clinical trial. Material and Methods. The review of articles had published in databases: MEDLINE, EMBASE, Scopus and Web of Science until December 2015. The selected prospective studies about the effect of exercise on IGF-1 level and its binding protein IGFBP in the context of selected civilization diseases prevention were collected. Results. The majority of the included studies indicate that mechanical loading is a key mechanism linking IGF-1/IGFBPs concentration and selected chronic diseases development. The duration and intensity of physical activity have a significant impact on IGF-1 and IGFBP serum. The highest concentration of IGF-1 in serum was after eccentric training. “Overtraining” increases unfavorable and unbound IGF-1 levels and contributes to the increased incidence of hormone-cancer and osteoarthritis. Conclusions. Irregularity of the GH/IGF-1 axis may affect on the development of rheumatic diseases, cardiovascular diseases (regulate cardiac growth and metabolism) and metabolic syndrome.
Wprowadzenie. Insulinopodobny czynnik wzrostu 1 (IGF-1, insulin-like growth factor 1), zwany inaczej somatomedyną C. IGF-1 to hormon polipeptydowy, który funkcjonalnie i strukturalnie jest podobny do insuliny. IGF-1 oddziałuje na tkanki za pomocą receptora IGF-1R i białek wiążących IGFBP. Nieprawidłowości w produkcji IGF-1 i IGFBP są związane z wysokim ryzykiem rozwoju wielu chorób cywilizacyjnych. Brak aktywności fizycznej i związany z tym nieprawidłowy poziom krążącego IGF-1 przyczyniają się do rozwoju wielu przewlekłych chorób. Cel. Celem badania była próba wyjaśnienia wpływu zmian stężenia IGF-1 i jego białka wiążącego IGFBP pod wpływem aktywności fizycznej na profilaktykę chorób cywilizacyjnych na podstawie analizy badań klinicznych. Materiał i metody. Dokonano przeglądu artykułów opublikowanych do grudnia 2015 i zamieszczonych w bazach: MEDLINE, EMBASE, Scopus i Web of Science. Zebrano najnowsze badania prospektywne dotyczące znaczenia wysiłku fizycznego dla utrzymania prawidłowego poziomu IGF-1 i jego białka wiążącego IGFBP w kontekście profilaktyki wybranych chorób cywilizacyjnych. Wyniki. Większość analizowanych badań wskazuje, że aktywność fizyczna regulując stężenie IGF-1 i IGFBPs wpływa na rozwój wybranych chorób cywilizacyjnych. Długość trwania i intensywność wysiłku fizycznego ma istotne znaczenie dla stężenia IGF-1 i IGFBPs. Największy wzrost IGF-1 obserwuje się w wyniku escentrycznej pracy mięśni. Stan „przetrenowania” powoduje wzrost niekorzystnego, niezwiązanego IGF-1 w surowicy. Wzrost poziomu IGF-1 niezwiązanego przyczynia się do zwiększonej zachorowalności na nowotwory hormonozależne i chorobę zwyrodnieniową stawów. Wnioski. Nieprawidłowości osi GH/IGF-1 mogą wpływać na rozwój chorób reumatycznych, chorób układu krążenia i zespołu metabolicznego.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2016, 67, 2
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transforming growth factor β1 protein and mRNA levels in inflammatory bowel diseases: towards solving the contradictions by longitudinal assessment of the protein and mRNA amounts
Autorzy:
Liberek, Anna
Kmieć, Zbigniew
Wierzbicki, Piotr
Jakóbkiewicz-Banecka, Joanna
Liberek, Tomasz
Łuczak, Grażyna
Plata-Nazar, Katarzyna
Słomińska-Frączek, Magdalena
Kaszubowska, Lucyna
Gabig-Cimińska, Magdalena
Węgrzyn, Alicja
Powiązania:
https://bibliotekanauki.pl/articles/1039466.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Crohn's disease
ulcerative colitis
Transforming Growth Factor-β1
longitudinal assessment of TGF-β1 level
Opis:
Previously published studies on levels of the transforming growth factor-β1 (TGF-β1) protein and mRNA of the corresponding gene in patients suffering from inflammatory bowel diseases (IBD) gave varying results, leading to contradictory conclusions. To solve the contradictions, we aimed to assess longitudinally TGF-β1 protein and mRNA levels at different stages of the disease in children suffering from IBD. The study group consisted of 19 pediatric patients with IBD at the age between 3.5 and 18.4 years. The control group consisted of 42 children aged between 2.0 and 18.0 years. The plasma TGF-β1 concentration was measured with ELISA. mRNA levels of the TGF-β1 gene isolated from samples of the intestinal tissue were assessed by reverse transcription and real-time PCR. Levels of TGF-β1 protein in plasma and corresponding mRNA in intestinal tissue were significantly higher in IBD patients than in controls. TGF-β1 and corresponding transcripts were also more abundant in plasma and intestinal tissue, respectively, in patients at the active stage of the disease than during remission. In every single IBD patient, plasma TGF-β1 level and mRNA level in intestinal tissue was higher at the active stage of the disease than during remission. Levels of TGF-β1 and corresponding mRNA are elevated during the active stage of IBD but not during the remission. Longitudinal assessment of this cytokine in a single patient may help to monitor the clinical course of IBD.
Źródło:
Acta Biochimica Polonica; 2013, 60, 4; 683-688
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Involvement of cyclooxygenase (COX)-2 products in acceleration of ulcer healing by gastrin and hepatocyte growth factor
Autorzy:
Brzozowski, T.
Konturek, P.C.
Konturek, S.J.
Pajdo, R.
Schuppan, D.
Drozdowicz, D.
Ptak, A.
Pawlik, M.
Nakamura, T.
Hahn, E.G.
Powiązania:
https://bibliotekanauki.pl/articles/69750.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
gastric ulcer
gastric blood flow
prostaglandin
ulcer healing
hepatocyte
cyclooxygenase-2
cyclooxygenase-1
growth factor
gastrin
Źródło:
Journal of Physiology and Pharmacology; 2000, 51, 4,1
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Clinical usefulness of assessing VEGF and soluble receptors sVEGFR-1 and sVEGFR-2 in women with breast cancer
Autorzy:
Thielemann, A.
Baszczuk, A.
Kopczynski, Z.
Kopczynski, P.
Grodecka-Gazdecka, S.
Powiązania:
https://bibliotekanauki.pl/articles/50027.pdf
Data publikacji:
2013
Wydawca:
Instytut Medycyny Wsi
Tematy:
clinical usefulness
vascular endothelial growth factor
soluble receptor
woman
breast cancer
patient
human disease
tumour metastasis
Opis:
Introduction. The biological activity of VEGF depends on the presence of its specific receptors on the endothelial surface: VEGFR-1, VEGFR-2, and on their soluble forms sVEGFR-1 and sVEGFR-2. The binding of the membrane-bound receptors with VEGF affects the permeability, proliferation and migration of vascular endothelial cells. This creates the necessary conditions for the vascularisation of solid tumours and for the spread of remote metastases. The sVEGFR-1 and sVEGFR-2 receptors are believed to be natural inhibitors of VEGF. Objective. To determine the clinical usefulness of VEGF and the sVEGFR-1 and sVEGFR-2 receptors level assay in women with primary breast cancer. The assessment also took into account: patient’s age, stage of the disease, histological grade, status of the axillary lymph nodes and size of the primary tumour. Material and methods. The concentrations of VEGF, sVEGFR-1 and sVEGFR-2 were ascertained in 103 women with primary breast cancer. The concentrations of VEGF in the plasma, and those of the soluble receptors sVEGFR-1 and sVEGFR-2 in the serum, were assessed by ELISA, R&D Systems. Results. The study found significantly raised concentrations of VEGF, sVEGFR-1 and sVEGFR-2 in the serum of women with breast cancer, relative to the values obtained from the control group. It was found that with increasing clinical stages of the disease, the levels of VEGF and concentrations of sVEGFR-1 and sVEGFR-2 also increased. Similar findings were noted when assessing the degree of the histological grade of the tumours. Significantly higher values of VEGF protein and the assessed receptors were obtained from women with metastases to the axillary lymph nodes. A positive relationship, though without statistical significance, was noted between the concentration of sVEGFR-2 and the size of the tumour. Conclusions. The high concentrations of the VEGF cytokine and the sVEGFR-1 and sVEGFR-2 receptors in women with breast cancer are responsible for giving rise to the processes of tumour angiogenesis. The concentrations of the VEGF protein and the soluble forms of the receptors sVEGFR-1 and sVEGFR-2 in the serum of breast cancer patients showed positive correlations with the clinical stage of the disease. These results point to the usefulness of VEGF assessment and its soluble receptors in the clinical evaluation of patients with breast cancer.
Źródło:
Annals of Agricultural and Environmental Medicine; 2013, 20, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Latent factor growth models for forecasting Polish GDP growth, inflation and unemployment using survey data
Autorzy:
Białowolski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/500358.pdf
Data publikacji:
2015
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
latent factor growth modelling
forecasting
GDP growth
inflation
unemployment
Opis:
In this paper a novel application of latent factor growth models is applied to responses to the manufacturing industry tendency survey conducted by the Research Institute for Economic Development, Warsaw School of Economics. An approach based on a common factor was assumed to explain variation in time response to specific questions drawn from the survey questionnaire. It was demonstrated that responses to questions relating to general economic situation in Poland, inflation and employment were explained by a latent growth factor, which was confirmed by RMSEA. Using cross-correlation and an ARIMAX model, it was shown that slopes obtained from latent factor growth models could be applied to forecasting or at least nowcasting of GDP growth and unemployment rate. Survey data of the type described clearly offer potential for refinement of economic projections and it is hoped that this work might stimulate further discussion of the methodology based on latent factor growth modeling for forecasting main macroeconomic time series.
Źródło:
Prace i Materiały Instytutu Rozwoju Gospodarczego SGH; 2015, 96: Analyzing and forecasting economic fluctuations; 69-93
0866-9503
Pojawia się w:
Prace i Materiały Instytutu Rozwoju Gospodarczego SGH
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of cow nutrition in the dry period on colostrum quality and immune status of calves
Autorzy:
Nowak, W.
Mikula, R.
Zachwieja, A.
Paczynska, K.
Pecka, E.
Drzazga, K.
Slosarz, P.
Powiązania:
https://bibliotekanauki.pl/articles/31995.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cow
animal nutrition
dry period
colostrum
quality
calf
immunological status
immunoglobulin
insulin-like growth factor 1
Opis:
The objective of the study was to evaluate the effect of energy contents in a dry period diets in “7+1” feeding strategy of dry cow including 7 weeks of the dry period (far-off) and 1 week of a close-up period, on colostrum quality and the immune status of calves. Forty Holstein multiparous cows were dried at 56d before the expected date of calving and were assigned to the higher energy diet group (HE; 0.69 UFL/kg DM, NDF 52% DM), or the lower energy diet group (LE; 0.61 UFL/1kg DM, NDF 56% DM). From -7d to the expected calving date up to 21 d of lactation, all cows were fed the same fresh, lactation diet. Samples of colostrum were collected within 2h after parturition and its density, dry matter content and concentrations of immunoglobulins, fat, protein, lactose, urea and somatic cell counts were measured. Calves were weighed 2 h after calving and on the 21d of life. On 3d and 21d of calves’ life blood samples were collected and the concentration of IgG, IgA, IgM, insulin-like growth factor 1 (IGF-1) as well as total protein and albumin concentrations were determined. Treatments had no significant effect on composition of colostrum and serum immunoglobulins and IGF-1 concentration. In both groups the weight of calves at birth was similar, still daily body weight gain during 21 day of rearing period in HE group was higher than in the LE group (P=0.05).
Źródło:
Polish Journal of Veterinary Sciences; 2012, 15, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ 8-miesięcznego treningu sportowego na stężenie naczyniowo-śródbłonkowego czynnika wzrostu u młodych lekkoatletów – udział adaptacyjnej angiogenezy w kształtowaniu wydolności tlenowej
The effects of an 8-month sports training on the levels of vascular endothelial growth factor in young athletes – the role of adaptive angiogenesis in the development of the aerobic capacity
Autorzy:
Krenc, Zbigniew
Mazurowski, Wojciech
Wosik-Erenbek, Marzenna
Wiszniewska, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/1033854.pdf
Data publikacji:
2015
Wydawca:
Medical Communications
Tematy:
angiogenesis
angiogeneza
athletes
physical efficiency
vascular endothelial growth factor
naczyniowo-śródbłonkowy czynnik wzrostu
wydolność fizyczna
sportowcy
Opis:
A long-term sports training induces morphological and functional changes in the cardiovascular system, with the activation of angiogenesis being one of the most significant ones. Aim: The aim of the study was to assess the impact of an 8-month sports training on the serum levels of vascular endothelial growth factor and the physical performance in young athletes. Material and methods: A total of 28 sports middle school students (athletics faculty) aged 13 years, including 14 boys and 14 girls, were included in the study. All participants underwent clinical assessment at each stage of the study. Electrocardiographic and echocardiographic examinations were performed. Furthermore, the levels of vascular endothelial growth factor were measured and a cardiac stress test was performed, the outcome of which was used to calculate the physical working capacity (PWC170). Results: There was a statistically significant decrease (274.3 ± 195.7 vs. 193.8 ± 153.8 ng/ml, p < 0.001) in the serum levels of vascular endothelial growth factor during the 8-month sports training. The levels were significantly lower in male athletes both at baseline (196.2 ± 157.3 vs. 352.4 ± 204.0 ng/ml, p = 0.02), and at the end of the observation period (139.6 ± 110.9 vs. 247.9 ± 174.6 ng/ml, p = 0.003). In the same period, the average PWC170 value increased throughout the study group (108.6 ± 28.1 vs. 119.0 ± 34.1 W, p = 0.02), and sex-related statistically significant changes occurred only on the male group of athletes. No statistically significant correlations were found between the relative changes in the levels of vascular endothelial growth factor and the PWC170 index (Spearman’s rank correlation coefficient – Rs 0.158, p > 0.05). Conclusions: Long-term sports training results in a decrease in the levels of vascular endothelial growth factor. At the same time, physical efficiency improvement is observed, which may suggest the involvement of adaptive, exerciseinduced angiogenesis in the skeletal muscles. However, the observed changes show distinct differences depending on the sex.
Długotrwały trening sportowy prowadzi do morfologicznych i czynnościowych zmian w układzie sercowo-naczyniowym, wśród których ważne miejsce zajmuje aktywacja procesów angiogenezy. Cel pracy: Celem pracy była ocena wpływu 8-miesięcznego treningu sportowego na stężenie naczyniowo-śródbłonkowego czynnika wzrostu w surowicy oraz wydolność fizyczną u młodych lekkoatletów. Materiał i metody: Badaniem objęto 28 uczniów gimnazjum sportowego o profilu lekkoatletycznym w wieku 13 lat, w tym 14 chłopców i 14 dziewcząt. Na każdym etapie badania wszyscy uczestnicy zostali poddani ocenie klinicznej. Wykonano u nich badania elektrokardiograficzne oraz echokardiograficzne. Oznaczono także stężenie naczyniowo-śródbłonkowego czynnika wzrostu oraz przeprowadzono próbę wysiłkową, której wynik posłużył do wyliczenia wskaźnika wydolności tlenowej PWC170. Wyniki badań: Podczas 8-miesięcznego treningu stężenie naczyniowo- -śródbłonkowego czynnika wzrostu w surowicy zmniejszyło się istotnie statystycznie (274,3 ± 195,7 vs 193,8 ± 153,8 ng/ml, p < 0,001). Jego stężenie było też istotnie niższe w grupie sportowców płci męskiej, zarówno na początku (196,2 ± 157,3 vs 352,4 ± 204,0 ng/ml, p = 0,02), jak i na końcu okresu obserwacji (139,6 ± 110,9 vs 247,9 ± 174,6 ng/ml, p = 0,003). W tym samym okresie średnia wartość wskaźnika PWC170 zwiększyła się w całej badanej grupie (108,6 ± 28,1 vs 119,0 ± 34,1 W, p = 0,02), a w odniesieniu do płci zmiany istotne statystycznie wystąpiły tylko u sportowców płci męskiej. Nie stwierdzono istotnych statystycznie korelacji pomiędzy względnymi zmianami stężenia naczyniowo-śródbłonkowego czynnika wzrostu i wartości wskaźnika PWC170 (współczynnik korelacji rang Spearmana – Rs 0,158, p > 0,05). Wnioski: Podczas długotrwałego treningu sportowego dochodzi do obniżenia stężenia naczyniowo-śródbłonkowego czynnika wzrostu. Jednocześnie obserwowana poprawa wydolności fizycznej może sugerować, że odbywa się to przy udziale adaptacyjnej, indukowanej wysiłkiem fizycznym angiogenezy w mięśniach szkieletowych. Zmiany te wykazują jednak wyraźne różnice zależne od płci.
Źródło:
Pediatria i Medycyna Rodzinna; 2015, 11, 4; 402-409
1734-1531
2451-0742
Pojawia się w:
Pediatria i Medycyna Rodzinna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Endogenous nitric oxide proves not to be involved in the inhibition by IL-1beta of TGF-alpha-stimulated proliferation of RGM1 cells
Autorzy:
Ishikawa, M.
Tsukimi, Y.
Ogawa, T.
Okabe, S.
Powiązania:
https://bibliotekanauki.pl/articles/70156.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
epidermal growth factor
interleukin 1
interleukin
cell
proliferation
DNA synthesis
nitric oxide
gastric mucosal cell
rat
Źródło:
Journal of Physiology and Pharmacology; 2000, 51, 3
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The growth differentiation factor-15 (GDF-15) can be useful in the detection of distant metastases in sera of colorectal cancer patients
Autorzy:
Jakubowska, K.
Pryczynicz, A.
Dymicka-Piekarska, V.
Cepowicz, D.
Jagodzińska, D.
Lewczuk, Ł.
Lebelt, A.
Ozimkiewicz, M.
Kiszło, P.
Guzińska-Ustymowicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/1917712.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Colorectal cancer
Growth differentiation factor-15
macrophage inhibitory cytokine-1
serum.
Opis:
Purpose: Growth differentiation factor-15 (GDF- 15) protein belongs to a transforming growth factor-β family which determines the growth and differentiation of cells. In cancers, GDF-15 influences on the proliferation, differentiation, viability, migration and invasiveness of cancer cells. The aim of our study was to evaluate the expression of GDF-15 in the tissue and its levels in sera of patients with colorectal cancer. Materials and methods: The level of GDF-15 in the sera of 55 patients diagnosed with colorectal cancer was determined using the ELISA method whereas expression of this protein was performed by immunohistochemical method. Results: The mean value of GDF-15 levels in the sera of patients with colorectal cancer was significantly higher than in healthy control group (p<0.001). The expression of GDF-15 in the tissue was weak, moderate and strong in 23.6%, 15.7% and 60.7% cases, respectively. Statistical analysis showed that the expression of GDF-15 correlated with patients’ age (p<0.005) and non-mucinous type of cancer (p<0.001). The high GDF-15 levels in the serum was associated with tumor size (p<0.01) and distant metastases (p<0.05). Conclusions: According to our results, we postulate that the level of GDF-15 in serum can be use to assess the metastatic behavior of colorectal cancer
Źródło:
Progress in Health Sciences; 2016, 6(1); 40-48
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The shRNA-mediated silencing of VEGF-C illustrates its role in proliferation, chemosensitization, tumour colonization, and anchorage independence
Autorzy:
Tambe, P.
Purohit, I.
Suneja, D.
More, S.
Desai, P.
Shrivastava, N.
Powiązania:
https://bibliotekanauki.pl/articles/80325.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
vascular endothelial growth factor
gene expression
endothelial cell
breast cancer
lymphangiogenesis
metastasis
proliferation
chemosensitivity
tumour cell
RNAi
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2015, 96, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transcriptional pattern of TGF-beta1 inhibitory effect on mouse C2C12 myoblasts differentiation
Autorzy:
Wicik, Z.
Sadkowski, T.
Jank, M.
Motyl, T.
Powiązania:
https://bibliotekanauki.pl/articles/30377.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transforming growth factor-beta 1
myogenesis
microarray
DNA microarray
differentiation
myoblast
mouse
mice
muscle cell
myosin heavy chain
Opis:
The aim of the present study was to define the effect of TGF-β1 on C2C12 myoblasts myogenesis. TGF-β1 together with its receptor is a negative auto-paracrine regulator of myogenesis, which influences the proliferation, differentiation, and functions of muscle cells. TGF-β1 exerts highly significant inhibitory effect on differentiation of C2C12 mouse myoblasts manifested by the impairment of cell fusion and very low expression of myosin heavy chain. The study of differentiating C2C12 mouse myoblasts treated with TGF-β1 revealed 502 genes (436 down-regulated and 66 up-regulated) with statistically different expression. TGF-β1-regulated genes were identified to be involved in 29 biological processes, 29 molecular functions groups and 59 pathways. The strongest inhibiting effect of TGF-β1 was observed in the cadherin and Wnt pathways. The key-genes that could play the role of TGF-β1 targets during myoblasts differentiation was identified such as: Max, Creb1, Ccna2, Bax, MdfI, Tef, Tubg1, Cxcl5, Rho, Calca and Lgals4.
Źródło:
Polish Journal of Veterinary Sciences; 2010, 13, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acromegaly: the effect of somatostatin analogues on tumour volume shrinkage
Autorzy:
Witek, Przemysław
Gutowska, Marta
Powiązania:
https://bibliotekanauki.pl/articles/1064786.pdf
Data publikacji:
2016
Wydawca:
Medical Education
Tematy:
acromegaly
growth hormone
insulin-like growth factor 1
lanreotide
long-acting somatostatin analogues
octreotide
pasireotide
somatotroph pituitary adenoma
tumour volume reduction
Opis:
Acromegaly is a rare disease, caused by growth hormone (GH) hypersecretion and secondarily elevated insulin-like growth factor 1 (IGF-1) level. Nearly all patients with acromegaly suffer from somatotroph pituitary adenoma. The main goal of treatment is to normalise both GH and IGF-1 levels, which reduces symptoms, complications and mortality. Transsphenoidal selective adenomectomy performed by an experienced neurosurgeon is the first-line therapy. Therapy with somatostatin analogues (SSA) is used as a neoadjuvant treatment prior to surgery and in a persistent disease following the surgery. The long-acting somatostatin analogues reduce serum GH/IGF-1 levels and tumour volume. In this clinical review, mechanisms and role of 1st and 2nd generation somatostatin analogues in the treatment of patients with acromegaly are presented, with particular emphasis on the effects on somatotroph pituitary adenoma volume reduction.
Źródło:
OncoReview; 2016, 6, 4; A162-168
2450-6125
Pojawia się w:
OncoReview
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bevacizumab in age-related macular degeneration – comparison of subjective estimation of vision with objective test results
Bevacizumab w zwyrodnieniu plamki związanym z wiekiem – porównanie subiektywnej oceny widzenia z obiektywnymi wynikami badań
Autorzy:
Piotrowska-Gwóźdź, Anna
Piotrowska-Seweryn, Agnieszka
Mazur-Piotrowska, Grażyna
Powiązania:
https://bibliotekanauki.pl/articles/1037681.pdf
Data publikacji:
2015
Wydawca:
Śląski Uniwersytet Medyczny w Katowicach
Tematy:
ge-related macular degeneration
bevacizumab
retina
vascular endothelial growth factor
zwyrodnienie plamki związane z wiekiem
beviacizumab
naczyniowy czynnik wzrostu
Opis:
PURPOSE: Anti-VEGF therapy plays a great role in medicine, especially in opthalmology. The aim of the therapy is to inhibit the VEGF-A factors that are responsible for the angiogenesis in diseases such as the wet form of age-related macular degeneration (AMD). One of the monoclonal anti-VEGF antibodies is bevacizumab (Avastin®; Genentech, Inc., South San Francisco, CA). The aim of the study was to compare the subjective estimation of visual acuity with objective test results in patients undergoing anti-VEGF therapy using Avastin. MATERIALS AND METHODS: The authors report a study of 57 patients (37 females and 20 males) with exudative AMD whose near and distance visual acuity was examined before the first dose of Avastin and 1 month after the third injection. Additionally, an original questionnaire evaluating the subjective state of vision during the activities of daily routine was performed. RESULTS: When examining distance visual acuity, 29 patients made an improvement, deterioration was reported in 5 cases and in 23 cases the results remained unaltered. The results were correlated with the subjective estimation. CONCLUSIONS 1. Avastin stabilizes the degeneration process of AMD in most patients and sometimes improves visual acuity. 2. There is a positive correlation between the objective test results and subjective opinion in patients undergoing anti-VEGF therapy using Avastin.
WSTĘP: Terapia anti-VEGF odgrywa niezwykle istotną rolę w medycynie, zwłaszcza w okulistyce. Polega na hamowaniu czynnika VEGF-A, który jest odpowiedzialny za angiogenezę w takich chorobach, jak wysiękowa postać zwyrodnienia plamki związanego z wiekiem (age-related macular degeneration – AMD). Jednym z przeciwciał monoklonalnych skierowanych przeciwko VEGF jest bevacizumab (Avastin®; Genentech, Inc., South San Francisco, CA). Celem badania jest porównanie subiektywnej oceny widzenia z obiektywnymi wynikami badań u pacjentów poddanych terapii anty-VEGF z zastosowaniem Avastinu. MATERIAŁ I METODY: Badaniem objęto 57 pacjentów (37 kobiet 20 mężczyzn) z wysiękową postacią AMD, u których dokonano oceny ostrości wzorku do bliży i dali przed pierwszą dawką i miesiąc po trzeciej iniekcji doszklistkowej Avastinu. Dodatkowo przeprowadzono autorską ankietą oceniającą widzenie podczas wykonywania czynności życia codziennego. WYNIKI: Analizując wyniki ostrości wzroku dla dali 29 pacjentów wykazało poprawę, 5 pogorszenie widzenia, a w 23 przypadkach ostrość wzroku nie uległa zmianie. Wykazano dodatnią korelację powyższych danych z wynikami subiektywnej oceny. WNIOSKI: 1. Avastin stabilizuje proces chorobowy w wysiękowej postaci AMD, a u niektórych pacjentów obserwowana jest poprawa ostrości widzenia. 2. Istnieje dodatnia korelacja między obiektywnymi wynikami ostrości wzroku a subiektywną oceną widzenia u pacjentów poddanych terapii anty-VEGF z zastosowaniem Avastinu.
Źródło:
Annales Academiae Medicae Silesiensis; 2015, 69; 33-41
1734-025X
Pojawia się w:
Annales Academiae Medicae Silesiensis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Serum levels of VEGF-A, sVEGFR-2 and galectin-3 do not correlate with clinical stage, tumor size, or effectiveness of perioperative chemotherapy in patients with non-metastatic breast cancer
Stężenie VEGF-A, sVEGFR-2 i galektyny-3 w surowicy pacjentek z rakiem piersi nie koreluje ze stopniem zaawansowania klinicznego, wielkością guza ani skutecznością chemioterapii okołooperacyjnej
Autorzy:
Grochoła-Małecka, Iga
Czajka-Francuz, Paulina
Owczarek, Aleksander J.
Wojnar, Jerzy
Handzlik, Gabriela
Francuz, Tomasz
Chudek, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/2122930.pdf
Data publikacji:
2022-09-29
Wydawca:
Śląski Uniwersytet Medyczny w Katowicach
Tematy:
breast cancer
angiogenesis
galectin-3
vascular endothelial growth factor
chemotherapy
rak piersi
angiogeneza
galektyna-3
czynnik wzrostu śródbłonka naczyń
chemioterapia
Opis:
INTRODUCTION: Tumor angiogenesis is regulated by numerous cytokines and growth factors, with vascular endothelial growth factor (VEGF), soluble vascular endothelial growth factor receptor 2 (sVEGFR-2), and galectin-3, playing a significant role in the process. There are conflicting data concerning changes in serum VEGF, sVEGFR-2 and galectin-3 levels in breast cancer (BC) patients during the course of the disease and chemotherapy (CTH). This study aimed to assess the serum levels of VEGF-A, sVEGFR-2, and galectin-3 in women starting adjuvant and neoadjuvant therapy for BC, and their changes during the treatment. MATERIAL AND METHODS: This single-center study enrolled 98 women with non-metastatic BC, including 56 who started adjuvant therapy and 42 preoperative (neoadjuvant/induction) CTH. The serum levels of VEGF-A, sVEGFR-2, and galectin-3 were assessed at the beginning of CTH and after 2 subsequent months. RESULTS: There were no significant differences in the serum levels of VEGF-A, sVEGFR-2, and galectin-3 between patients starting adjuvant and preoperative therapy. In addition, there was no correlation between the serum levels and the clinical stage of BC. During CTH, a significant increase in VEGF-A, sVEGFR-2, and galectin-3 was noted, however, without a predictive significance for obtaining complete pathological response (pCR) both for the initial levels and changes in the serum levels. CONCLUSIONS: The serum levels of VEGF-A, sVEGFR-2, and galectin-3 do not correlate with the clinical stage or tumor size in patients with non-metastatic BC. The baseline levels of VEGF-A, sVEGFR-2 and galectin-3, and the observed increase in the serum levels of VEGF-A and sVEGFR-2 during CTH do not predict its efficacy.
WSTĘP: Angiogeneza nowotworowa jest procesem regulowanym przez wiele cytokin i czynników wzrostu, spośród których znaczącą rolę odgrywają czynnik wzrostu śródbłonka naczyń (vascular endothelial growth factor – VEGF), drugi rozpuszczalny receptor dla śródbłonkowego czynnika wzrostu (soluble vascular endothelial growth factor recep-tor 2 – sVEGFR-2) i galektyna-3. Dane literaturowe dotyczące oceny zmian stężenia VEGF, sVEGFR-2 oraz galekty-ny-3 w trakcie chemioterapii (chemotherapy – CTH) raka piersi (breast cancer – BC) są niejednoznaczne. Celem niniej-szej pracy była analiza stężenia VEGF-A, sVEGFR-2 oraz galektyny-3 w surowicy pacjentek z rakiem piersi, rozpoczynających adjuwantową i neoadjuwantową chemioterapię oraz ocena zmian stężenia tych cytokin w trakcie leczenia. MATERIAŁ I METODY: Jednoośrodkowe badanie objęło 98 pacjentek z miejscowo zaawansowanym rakiem piersi, w tym 56 poddanych adjuwantowej i 42 neoadjuwantowej terapii. Stężenie VEGF-A, sVEGFR-2 i galektyny-3 w surowicy krwi oceniono na początku leczenia oraz po 2 miesiącach terapii. WYNIKI: Nie stwierdzono istotnych różnic pomiędzy stężeniami VEGF-A, sVEGFR-2 oraz galektyny-3 w surowicy pacjentek poddanych adjuwantowej i neoadjuwantowej chemioterapii. Nie wykazano również zależności między stężeniem tych cytokin w surowicy a stopniem zaawansowania klinicznego raka piersi. W trakcie przedoperacyjnej chemio-terapii odnotowano znaczące zwiększenie stężenia VEGF-A, sVEGFR-2 i galektyny-3, jednakże zarówno wyjściowe stężenia cytokin, jak i zmiany w czasie nie miały znaczenia predykcyjnego dla uzyskania całkowitej odpowiedzi pato-ogicznej. WNIOSKI: Stężenia VEGF-A, sVEGFR-2 oraz galektyny-3 w surowicy nie korelują ze stopniem zaawansowania klinicznego ani masą nowotworu u pacjentek z miejscowo zaawansowanym rakiem piersi. Wyjściowe stężenia VEGF-A, sVEGFR-2 i galektyny-3 oraz zaobserwowany wzrost stężeń tych cytokin w surowicy w trakcie chemioterapii nie mają wartości predykcyjnej dla jej skuteczności.
Źródło:
Annales Academiae Medicae Silesiensis; 2022, 76; 96-105
1734-025X
Pojawia się w:
Annales Academiae Medicae Silesiensis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Lambda-Cyhalothrin - An Insecticide from the Group of Synthetic Pyrethroids - on the Concentrations of NF-ĸB and VEGFR2 in the Liver of Albino Swiss Mice as Markers of its Damage
Wpływ lambda-cyhalothrin - insektycydu z grupy syntetycznych pyretroidów - na stężenia NF-ĸB i VEGFR2 w wątrobie myszy Albino Swiss jako markerów jego uszkodzenia
Autorzy:
Świerszcz, Łukasz
Roszkowska, Anna
Ruszel, Kinga
Wójciak-Czuła, Marta
Borzęcki, Andrzej
Nieradko-Iwanicka, Barbara
Siermontowski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/32703708.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Medycyny i Techniki Hiperbarycznej
Tematy:
lambda-cyhalothrin
nuclear factor ĸB
vascular endothelial growth factor2
liver damage
lambda-cyhalotryna
czynnik jądrowy ĸB
czynnik wzrostu śródbłonka naczyniowego 2
uszkodzenie wątroby
Opis:
Background: Lambda-cyhalothrin (LCH) is a one of the type II synthetic pyrethroids which is widely used in veterinary medicine and in agriculture to protect crops from pest insects. In previous studies, there are few reports about the influence of pyrethroids on the liver and its damage. Analyzing numerous publications, nuclear factor-ĸB (NF-ĸB) and vascular endothelial growth factor 2 (VEGFR2) seem to be sensitive indicators of microdamages occurring at the cellular level in the liver. The aim of the study was to investigate the effect of subacute poisoning with LCH on the concentration of NFĸB and VEGFR2 in the livers. Methods: The experiment was carried on 32 Albino Swiss mice (16 females and 16 males). The animals were divided into 4 groups. Controls received canola oil, the rest received LCH orally in oil at a dose of 2 mg/kg bw for 7 days. The NF-ĸB and VEGFR2 were mesuredin mice livers with ELISA kits. Results: The mean NF-ĸB concektration in control femals’ livers was 3.27ng/mL and after LCH it was 6.12ng/mL (p<0.05). In control males it was 5.49ng/mL and it did not significantly differ after LCH when it was 5.27ng/mL. The mean VEGFR2 in control females was 84.28ng/mL and after LCH it was 173.81ng/mL (p<0.05). In control males it was 170.61ng/mL and after LCH 170.06ng/mL. Conclusion:The NF-ĸB and VEGFR2 can be used as markers of liver damage after subacute poisoning with LCH on female mice. Females are more sensitive to LCH than males.
Wstęp: Lambda-cyhalotryna (LCH) jest jednym z syntetycznych pyretroidów typu II, szeroko stosowanym w weterynarii i rolnictwie do ochrony upraw przed owadami. We wcześniejszych badaniach niewiele jest doniesień o wpływie pyretroidów na wątrobę i jej uszkodzenia. Analizując liczne publikacje, czynnik jądrowy-ĸB (NF-ĸB) i czynnik wzrostu śródbłonka naczyniowego 2 (VEGFR2) wydają się być czułymi wskaźnikami mikrouszkodzeń występujących na poziomie komórkowym w wątrobie. Celem pracy było zbadanie wpływu podostrego zatrucia LCH na stężenie NFĸB i VEGFR2 w wątrobie. Metody: Doświadczenie przeprowadzono na 32 myszach Albino Swiss (16 samic i 16 samców). Zwierzęta podzielono na 4 grupy. Kontrolne grupy samic i samców otrzymywały olej rzepakowy, pozostałe otrzymywały LCH doustnie w oleju w dawce 2 mg/kg mc przez 7 dni. NF-ĸB i VEGFR2 były w wątrobach myszy były mierzone z użyciem zestawów ELISA. Wyniki: Średnie stężenie NF-ĸB w wątrobach kontrolnych samic wynosiło 3,27 ng/ml, a po LCH 6,12 ng/ml (p<0,05). U samców kontrolnych wynosił on 5,49 ng/ml i nie różnił się istotnie po LCH, gdzie wynosił 5,27 ng/ml. Średnie stężenie VEGFR2 u samic z grupy kontrolnej wynosił 84,28 ng/ml, a narażonych na LCH 173,81 ng/ml (p<0,05). U samców z grupy kontrolnej wynosiło 170,61 ng/ml, a narażonych na LCH 170,06 ng/ml. Wniosek: NF-ĸB i VEGFR2 można stosować jako markery uszkodzenia wątroby po podostrym zatruciu LCH u samic myszy. Samice są bardziej wrażliwe na LCH niż samce.
Źródło:
Polish Hyperbaric Research; 2021, 2(75); 57-68
1734-7009
2084-0535
Pojawia się w:
Polish Hyperbaric Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Gas6 gene rs8191974 and Ap3s2 gene rs2028299 are associated with type 2 diabetes in the northern Chinese Han population
Autorzy:
Kazakova, Elena
Zghuang, Tianwei
Li, Tingting
Fang, Qingxiao
Han, Jun
Qiao, Hong
Powiązania:
https://bibliotekanauki.pl/articles/1038636.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Type 2 diabetes mellitus
Gas6 gene
Ap3s2 gene
single nucleotide polymorphisms
epidermal growth factor (EGF)-like
Opis:
Previous studies in other countries have shown that single nucleotide polymorphisms (SNPs) in the growth arrest-specific gene 6 (Gas6; rs8191974) and adapter-related protein complex 3 subunit sigma-2 (Ap3s2; rs2028299) were associated with an increasedrisk for type 2 diabetes mellitus (T2DM). However, the association of these loci with T2DM has not been examined in Chinese populations. We performed a replication study to investigate the association of these susceptibility loci with T2DM in the Chinese population.We genotyped 1968 Chinese participants (996 with T2DM and 972controls) for rs8191974 in Gas6 and rs2028299 near Ap3s2, and examined their association with T2DM using a logistic regression analysis. We also analyzed the correlation of genotypes and clinical phenotypes. The distribution of the T allele of SNP rs8191974 in the Gas6 gene was significantly different between T2DM cases and controls when compared with the C allele (P<0.05, OR: 0.80, 95% CI: 0.69-0.94). The occurrence of the CT genotype and the dominant model was also significantly less frequent in the T2DM cases vs. controls when compared with the CC genotype (CT vs. CC: P<0.05, OR: 0.75, 95% CI:0.62-0.90; TT+CT vs. CC: P<0.05, OR:0.75, 95% CI:0.63-0.90). In SNP rs2028299, the allele C showed no statistically significant differencein distribution between the control and T2DM groups when compared with allele A. However, in male populations, the dominant model was statistically more frequent when compared with genotype AA (CC+CA vs. AA: P<0.05, OR:1.29, 95% CI:1.02-1.64), and in obesity-stratified analysis, we also observed a significant difference in the distribution of the dominant model between the T2DM cases and controls in subjects with BMI≥24 kg/m2 and BMI<28kg/m2 (CC+CA vs. AA: P<0.05, OR: 6.33, 95% CI:4.17-9.61). In conclusion, our study shows that SNPsrs8191974 and rs2028299 are significantly associated with T2DM in the Chinese population.
Źródło:
Acta Biochimica Polonica; 2017, 64, 2; 227-231
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena właściwości kulinarnych wybranych makaronów bezglutenowych
Culinary evaluation of selected gluten-free pasta
Autorzy:
Ruszkowska, M.
Rogowska, O.
Powiązania:
https://bibliotekanauki.pl/articles/2073200.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
makaron bezglutenowy
współczynnik przyrostu wagowego
minimalny czas gotowania
ocena organoleptyczna
gluten-free pasta
weight growth factor
minimal cooking time
organoleptic assessment
Opis:
W pracy dokonano oceny właściwości kulinarnych makaronów bezglutenowych. Wyznaczono minimalny i optymalny czas gotowania, współczynnik przyrostu wagowego, współczynnik strat suchej substancji oraz dokonano oceny organoleptycznej. Zbadano trzy wybrane makarony bezglutenowe z grupy makaronów drobnych fusilli: Sam Mills; Shar; Bezgluten oraz makaron pszenny Lubella jako próba odniesienia.
The properties of culinary gluten-free pasta were evaluated in the paper. The minimal and optimal cooking time, weight growth factor, dry matter loss factor and sensory evaluation were determined. Three examples of gluten-free pasta selected from a group of small fusilli pasta: Sam Mills, Shar, Bezgluten and wheat noodles Lubella as a reference level were tested.
Źródło:
Inżynieria i Aparatura Chemiczna; 2015, 5; 277--278
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Density of tumor-associated macrophages (TAMs) and expression of their growth factor receptor MCSF-R and CD14 in canine mammary adenocarcinomas of various grade of malignancy and metastasis
Autorzy:
Krol, M.
Pawlowski, K.
Majchrzak, K.
Dolka, I.
Abramowicz, A.
Szyszko, K.
Motyl, T.
Powiązania:
https://bibliotekanauki.pl/articles/32107.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
adenocarcinoma
canine adenocarcinoma
density
dog
expression
growth factor
immunohistochemistry
immunology
malignancy
mammary adenocarcinoma
metastasis
tissue sample
tumour microenvironment
tumour-associated macrophage
Opis:
Several years ago, the presence of macrophages in the tumor microenvironment was thought to be an inflammatory response to kill the cancer cells. Now, this is clear that the inflammatory cells that exit blood vessels and migrate to the tumor tissue play an important role in cancer progression. Various cells present in the tumor microenvironment enhance cancer growth and invasiveness by secretion of tumor-enhancing products. That is why tumors should not be treated as only aggregates of cancer cells but as separate structures. Macrophages form a major component of the inflammatory infiltration in tumors, where they are termed tumor-associated macrophages (TAMs). To the best of our knowledge, up-to-date there were no studies on tumor associated macrophages and the role of the tumor microenvironment in tumor invasion/metastasis in dogs. This is the first study performed to asses if the number of TAMs and expression of MCSF-R (macrophages colony stimulating factor receptor) and CD14 (LPS co-receptor) are associated with the grade of tumor malignancy and its ability to metastasize. We have performed immunohistochemical analysis of 50 canine mammary adenocarcinomas of various grade of malignancy (1st, 2nd, 3rd) and tumors that gave local or distant metastases. The results indicate that in dogs, similarly to humans and mice, the number of tumor associated macrophages is related to the cancer ability to metastasize. Our results also indicate that the expression of MCSF-R and, what is particularly new finding, CD14 is associated with tumor malignancy and its ability to metastasize. Hence, these molecules play a role in tumor progression, metastasis and microenvironment interactions. These results show that in dogs we should treat the tumor as a whole organ rather than just try to eliminate the cancer cells.
Źródło:
Polish Journal of Veterinary Sciences; 2011, 14, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mikologiczne skazenia zywnosci
Autorzy:
Wieczorek, C
Powiązania:
https://bibliotekanauki.pl/articles/825985.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Technologów Żywności
Tematy:
plesnie
przemysl spozywczy
zywnosc
zanieczyszczenia mikrobiologiczne
mikotoksyny
czynniki wzrostu
skazenie zywnosci
mould
food industry
food
microbiological contamination
mycotoxin
growth factor
food contamination
Opis:
W artykule opisano zanieczyszczenie żywności pleśniami i omówiono warunki sprzyjające wytwarzaniu mikotoksyn. Wzrost pleśni powoduje pogorszenie jakości lub zepsucie produktów spożywczych, co może prowadzić do zmiany wyglądu, nieprzyjemnego zapachu, obniżonej zdolności kiełkowania nasion, skażenia mikotoksynami i/lub alergii i infekcji u ludzi. Wysoka toksyczność metabolitów pleśni jest dużym zagrożeniem dla konsumentów. Tworzenie mikotoksyn następuje wyłącznie w wyniku wzrostu pleśni toksynotwórczych. Szczególny wpływ na rodzaj występujących pleśni ma skład żywności. Natomiast rozwój i wzrost pleśni w znaczącym stopniu uwarunkowane są: aktywnością wody (aw), temperaturą, wartością pH, zawartością O2 i CO2, rodzajem substratu i składem mikoflory.
The article describes results of food contamination by molds and conditions fostering mycotoxin contamination of foods. The molds growth leads to quality deterioration or spoiling of different kind of foodstuffs. It may result in an unpleasant odour and appearance of the product, reduced seed germination, mycotoxin pollution and/or human allergy and infection. The highly toxic fungal metabolites are particulary dangerous for consumers. Mycotoxins formation in foodstuffs takes place only as a result of growth of toxin-creating molds. Substrates composition influences specially the mold spectrum in foods. Whereas the mold growth and expansion are considerably determined by aw, temperature, pH, atmosphere and microbial competition.
Źródło:
Żywność Nauka Technologia Jakość; 2003, 10, 3; 119-129
1425-6959
Pojawia się w:
Żywność Nauka Technologia Jakość
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Local effect of progesterone infusion into ovarian artery on activin A and inhibin alpha-subunit secretion during the middle luteal phase in gilts
Autorzy:
Wasowska, B
Stefanczyk-Krzymowska, S.
Powiązania:
https://bibliotekanauki.pl/articles/30684.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dimeric glycoprotein
activin
inhibin
growth factor-beta
progesterone infusion
ovarian artery
alpha-subunit
secretion
exogenous progesterone
local feedback
gilt
middle luteal phase
Opis:
The present study was undertaken to elucidate whether an increased, but physiological, amount of progesterone (P4) supplied to the porcine corpus luteum affects luteal secretion of activin A and inhibin a-subunit (Inha) in freely moving gilts. On day 9 of the estrous cycle (EC), both ovarian arteries and both ovarian veins of gilts (n=5) were cannulated. Progesterone was infused into the right ovarian arteries in gilts on days 10, 11 and 12 of the EC at a rate adequate to its physiological retrograde transfer found during the middle luteal phase of the EC. The P4 infusion rate was 0.62 μg/min (day 10), 2x0.62 μg/min (day 11) and 3x0.62 μg/min (day 12). The left ovarian arteries were infused with saline (control). Blood samples were collected from both ovarian veins on days 10-12 of the EC before and after P4 or saline infusion. The mean plasma activin A level in the ovarian vein ipsilateral to the P4-infused ovary was higher (PcO.OOOl) on days 10-12 of the EC than this found in the contralateral ovarian vein. The level of activin A in the ovarian vein ipsilataral to the infusion of P4 was higher on days 11 (PcO.Ol) and 12 (P<0.0001) and tended to be higher (P<0.07) on day 10 of the EC than this in contralateral ovarian vein. The level of Inha in the ovarian vein ipsilateral to the P4-infused ovary on days 10-12 of the EC was not significantly different (P>0.05) than this found in the contralateral ovarian vein. The results of the present study indicate that a local elevation of P4 concentration in blood supplying the ovary during the middle luteal phase of the porcine EC affects ovarian secretion of activin A. The effect of P4 on the secretion of activin A suggested the existence of a short regulatory loop of a positive feedback between P4 being retrogradely transferred into the ovary and the secretion of this peptide.
Źródło:
Polish Journal of Veterinary Sciences; 2010, 13, 1; 97-104
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The presence of CD25 on bovine WC1 plus gamma delta T cells is positively correlated with their production of IL-10 and TGF-beta, but not IFN-gamma
Autorzy:
Maslanka, T.
Jaroszewski, J.J.
Markiewicz, W.
Ziolkowski, H.
Barski, D.
Powiązania:
https://bibliotekanauki.pl/articles/32183.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cattle
WC1 cell
T cell
T lymphocyte
transforming growth factor-beta
interleukin 10
interferon-gamma
CD25 antigen
CD25 molecule
Opis:
WC1+ cells in cattle exhibit both regulatory and effector activities. However, it has not been elucidated whether they are so plastic that both activities co-exist in one cell or there are separate subpopulations of effector and regulatory cells. Since the production of IFN-γ and IL-10 seems to be related to WC1+ cells’ effector and regulatory function, respectively, the main aim of this study was to determine whether those cytokines are produced by separate subpopulations of WC1+, or are co-produced by the same cells. Due to increasingly frequent emphasised role of consumption of IL-2 in the mechanism of suppressor action of mouse CD25+CD4+ T regulatory cells, expression of the receptor’s α chain for interleukin 2 (CD25) on WC1+ lymphocytes has been evaluated. An average of 5.21% of WC1+ cells obtained from PBMCs of 12-month-old heifers show constitutive expression of the CD25 molecule, with CD25highWC1+ and CD25lowWC1+ cells accounting for 1.05% and 4.10% of WC1+ lymphocytes, respectively. For detection of intracellular cytokine production, PBMCs were stimulated with concanavalin A. Both IFN-γ- and IL-10-producing cells within the CD25-WC1+ and CD25+WC1+ subpopulations were mainly separate subpopulations. The average percentage of IFN-γ+IL-10-, IFN-γ-IL-10+ and IFN-γ+IL-10+ cells among CD25-WC1+ lymphocytes was 4.03%, 2.67% and 0.51%, respectively. A positive correlation was observed between the presence of the CD25 molecule on WC1+ lymphocytes and production of IL-10 and TGF-β, because the average percentage of IFN-γ-IL-10+ and IFN-γ+IL-10+ among CD25+WC1+ lymphocytes was 3 and 4.5 times higher as compared to the corresponding cells in the CD25-WC1+ subpopulation, whereas the percentage of IFN-γ+IL-10- cells in both the subpopulations was not significantly different. The percentage of TGF-β+ cells within the CD25+WC1+ subpopulation was 2.72 times as high as that of CD25-WC1+ lymphocytes. Therefore, with respect to the production of IFN-γ, IL-10 and TGF-β, CD25+WC1+ lymphocytes turn out to have a more suppressor profile than CD25-WC1+.
Źródło:
Polish Journal of Veterinary Sciences; 2012, 15, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Histopathologic and immunohistochemical lesions in liver of mink infected with Aleutian disease virus
Autorzy:
Valdovska, A.
Pilmane, M.
Powiązania:
https://bibliotekanauki.pl/articles/30104.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Aleutian disease
Aleutian mink disease parvovirus
animal infection
beta-defensin-2
histopathology
immunohistochemistry
liver
liver parenchyma
mink
nerve growth factor receptor
metalloproteinase
Opis:
Parvovirus of Aleutian disease causes mainly damage to kidneys, but immune complexes deposition and damage may occur also in other organs. In mink farms of Latvia the liver dystrophy or hepatic lipidosis of mink is widely distributed. The goal of this study was to examine probability of liver damage and regeneration of mink infected with Aleutian disease virus. Liver injury was assessed histologically. The mink liver demonstrated inflammation of liver parenchyma and foci of fatty liver. In immunohistochemistry, during liver regeneration the matrix metalloproteinases MMP-9, vascular endothelial growth factor and β-defensin 2 expressions were lower, but MMP-2 and nerve growth factor receptor p75 expression was increased.
Źródło:
Polish Journal of Veterinary Sciences; 2011, 14, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Osocze bogatopłytkowe, a proces starzenia się skóry
A rich plasma vs. the aging process
Autorzy:
Kurek, Monika
Powiązania:
https://bibliotekanauki.pl/articles/526838.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Opolski. Instytut Nauk o Zdrowiu
Tematy:
starzenie się skóry
PRP, osocze bogatopłytkowe
białka krwi
czynnik wzrostu
biostymulacja
skin aging process
PRP
rich plasma
blood proteins
growth factor
biostimulation
Opis:
Organizm człowieka ma ogromne zdolności regeneracyjne, dlatego od kilku lat w medycynie estetycznej trwają intensywne badania nad zastosowaniem przeszczepów własnych komórek w celu „odmłodzenia skóry“. Własny materiał jest zawsze najbezpieczniejszy, a elementy składowe stanowiące o właściwościach skóry,takie jak: kolagen, elastyna czy kwas hialuronowy tworzą bardzo skomplikowane wzajemnie łączące się struktury. PRP - to zabieg z grupy zabiegów biostymulacyjnych. Biostymulacja w ostrzykiwaniu krwią opiera się głównie na wykorzystaniu czynników wzrostu uwalnianych z trombocytów, a wpływających bezpośrednio na procesy regeneracyjne skóry. Dzięki zastosowaniu osocza bogatopłytkowego możemy uniknąć powikłań powstających podczas używania innych wolumetrycznch wypełniaczy syntetycznych, a dzięki wykorzystaniu czynników wzrostu z własnej krwi dłużej cieszyć się młodością.
The human body has enormous regenerative abilities. Therefore, for the last several years, there has been an intensive research going on in the field of esthetic medicine on the use of our own cell transplantations in order to rejuvenate the skin. The material is always the safest and the components forming the properties of the skin, such as collagen, elastin and hyaluronic acid, form very complicated and mutualy connected structures. PRP is a procedure which belongs to a group of biostimulating treatments. Biostimulation in injecting the blood is mainly based on the use of growth factors released from thrombocytes and affecting the skin regeneration process directly. By the use of rich plasma and the growth factors from our own blood, we can avoid complications arising during the process of using other synthetic and volumetric fi llers and enjoy longer youth.
Źródło:
Puls Uczelni; 2012, 1; 11-13
2080-2021
Pojawia się w:
Puls Uczelni
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zaburzenia kaskady transformujących czynnikow wzrostu typu β w wybranych patologiach człowieka
Aberrations in the signalling cascade of transforming growth factor β type in selected human pathologies
Autorzy:
Zakrzewski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/1032754.pdf
Data publikacji:
2012
Wydawca:
Łódzkie Towarzystwo Naukowe
Tematy:
transformujące czynniki wzrostu typu β - tgfβ
sygnalizacja
komórkowa
patofizjologia
polimorfizm
mutacje
transforming growth factor β type - tgfβ
cellular signalling
pathophysiology
polymorphism
mutations
Opis:
A transforming growth factor β type (TGFβ) cascade is a multifactorial signalling pathway, which controls the plethora of cellular processes responsible for human organism homeostasis. The importance of alterations of TGFβ-induced signalling remains unknown. Up till now, impaired TGFβ signalling has been observed in pathologies of the musculoskeletal, cardiovascular and reproductive systems. Abnormalities in the TGFβ pathway can be either genetically determined or appear as spontaneous disorders which emerged during embryonic development. Understanding the role of the TGFβ pathway in the aetiology of various diseases appears to be necessary as it may serve in developing new strategies for therapeutic or diagnostic methods.
Kaskada sygnalizacyjna transformujących czynników wzrostu typu β (TGFβ) stanowi indukowany przez wiele cytokin szlak przekazywania sygnału w komórce, pod kontrolą którego znajduje się szereg procesów komórkowych odpowiedzialnych za prawidłowe funkcjonowanie ludzkiego organizmu. Znaczenie zaburzeń sygnalizacji indukowanej czynnikami TGFβ pozostaje nadal nie do końca poznane. Niemniej jednak już na obecnym etapie badań stwierdzić można ich bezsprzeczny udział w patologiach układu kostno-mięśniowego, układu krwionośnego czy układu rozrodczego.
Źródło:
Folia Medica Lodziensia; 2012, 39, 2; 265-292
0071-6731
Pojawia się w:
Folia Medica Lodziensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polymorphism of insulin like growth factor IGF-1 in position 211 in national sheep breeds with carped wool compared to Polish Merino and European Muflon (Ovis aries musimon)
Polimorfizm genu czynnika insulinopodobnego IGF-1 w pozycji 211 u krajowych owiec o wełnie mieszanej w porównaniu do merynosa polskiego i muflona europejskiego (Ovis aries musimon)
Autorzy:
Niznikowski, R.
Czub, G.
Glowacz, K.
Swiatek, M.
Slezak, M.
Powiązania:
https://bibliotekanauki.pl/articles/2867.pdf
Data publikacji:
2013
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
polymorphism
insulin-like growth factor
IGF1 protein
national breed
sheep
animal breed
carped wool
Polish Merino breed
Ovis aries musimon
European mouflon
allele
genotype
distribution
Opis:
Research was carried out on 1,684 sheep (1,093 F and 591 M) originating from European Mouflon (Ovis aries musimon), its hybrids with Polish heat sheep and four sheep breeds that are characterized by a mixed wool compared to Polish Merino. All animals were subjected to gene identification factor insulin-IGF-1, in the assessment of allele C and T. In conclusion it should be noted that in the 7 examined breed groups sheep showed no polymorphism alleles and genotypes of insulin-like factor gene IGF-1, limiting its scope to determine the C allele and genotype CC. This result indicates the need for further research in this area in "culture" sheep imported and adapted to Polish conditions and the production environment.
Polimorfizm genu czynnika insulinopodobnego IGF-1 w pozycji 211 u krajowych owiec o wełnie mieszanej w porównaniu do merynosa polskiego i muflona europejskiego (Ovis aries musimon). Badania przeprowadzono na materiale 1684 owiec (1093 samic i 591 samców) pochodzących od muflona europejskiego (Ovis aries musimon), jego mieszańców z wrzosówką oraz czterech ras owiec charakteryzujących się okrywą wełnistą mieszaną porównywanych do merynosa polskiego. Wszystkie zwierzęta poddane były identyfikacji genu czynnika insulinopodobnego IGF-1, w zakresie oceny występowania alleli C i T. Podsumowując, należy stwierdzić, iż u badanych 7 grup rasowych owiec nie wykazano polimorfizmu występowania alleli i genotypów genu czynnika insulinopodobnego IGF-1, ograniczając jego zakres do ustalenie jedynie do allelu C i genotypu CC. Wynik ten wskazuje na potrzeby przeprowadzenia dalszych badań z tego zakresu u owiec kulturalnych pochodzących z importu i adaptowanych w polskich warunkach środowiska produkcyjnego.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Animal Science; 2013, 52
1898-8830
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Animal Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Therapeutic potential of heme oxygenase-1 in cardiovascular disease
Autorzy:
Jazwa, A.
Florczyk, U.
Stepniewski, J.
Jozkowicz, A.
Dulak, J.
Powiązania:
https://bibliotekanauki.pl/articles/80176.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
angiogenesis
angiogenic factor
antiapoptotic effect
antiinflammatory effect
antioxidant effect
carbon monoxide
cardiovascular disease
cytoprotection
endothelial cell
ferrous iron
heme oxygenase-1
hypoxia
iron
stem cell
stromal cell
therapeutic potential
vascular endothelial growth factor-A
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2011, 92, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationships between EGFR-initiated signalling, DNA double-strand break rejoining and survival in X-irradiated human glioma M059 cells
Autorzy:
Grądzka, I.
Buraczewska, I.
Szumiel, I.
Powiązania:
https://bibliotekanauki.pl/articles/146764.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
human glioma M059 K and J cells
DNA-dependent protein kinase (DNA-PK)
radiosensitivity
DNA double-strand break (DSB) rejoining
epidermal-growth-factor-receptor (EGFR)
signalling inhibitors: tyrphostin
Opis:
The aim of this study was to investigate the effect of signalling inhibition on survival and double-strand break (DSB) rejoining in cells differing in sensitivity to inhibitors, X-rays and bleomycin. Human glioma M059 cells, K (relatively radioresistant) and J (radiosensitive, defective in DSB rejoining for lack of DNA-dependent protein kinase catalytic subunit, DNA-PKcs) were pretreated with signalling inhibitors: tyrphostin AG 1478, specific for epidermalgrowth- factor-receptor (EGFR) kinase or PD 98059, specific for kinase MEK 1/2 (mitogen-activated, extracellular signal-activated kinases 1 and 2). Subsequently, the cells were X-irradiated or treated with bleomycin. Cell survival was determined by clonogenicity test. DSB rejoining was monitored with the use of pulsed-field gel electrophoresis (PFGE). We found that in X-irradiated M059 K cells EGFR kinase activity was necessary for efficient DSB rejoining and the kinase inhibitor, tyrphostin AG 1478, acted as radiosensitizer in the dose range that reduced cell survival to 0.7-0.8. Inhibition of EGFR kinase, however, did not decrease survival or affect DSB rejoining in DNA-PKcs-deficient M059 J cells. These results indicated that the decrease in cell survival was due to a disturbed DSB rejoining by the DNA-PK dependent system. In contrast, inhibition of MEK 1/2 kinase on EGFR downstream signalling pathway by PD 98059 did not affect DSB rejoining in either cell line and exerted a radioprotective effect.
Źródło:
Nukleonika; 2008, 53, 2; 37-44
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rola VEGF, czynnika neurotroficznego i proangiogennego w patogenezie choroby Alzheimera
Role of VEGF, neurotrophic and proangiogenic factor in pathogenesis of Alzheimer’s disease
Autorzy:
Nowacka, Marta
Obuchowicz, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/1057990.pdf
Data publikacji:
2011
Wydawca:
Medical Communications
Tematy:
Alzheimer’s disease
b-amyloid
modele transgeniczne choroby Alzheimera
transgenic models
treatment of AD
vascular endothelial growth factor (VEGF)
leczenie
naczyniowo-śródbłonkowy czynnik wzrostu (VEGF)
choroba Alzhaimera
modele transgeniczne choroby Alzhaimer'a
Opis:
Currently, neurodegenerative disorders represent one of the most serious diseases the mankind is struggling with. An increased morbidity rate of Alzheimer’s disease seems to be associated with general population aging. Despite the fact that the intensive studies have been conducted in many research centres for several years, etiopathogenesis of Alzheimer’s disease is still not fully understood. Furthermore, there is no drug which could, at least, inhibit progress of this disease effectively. Vascular endothelial growth factor (VEGF) is well-characterized proangiogenic substance, essential for the formation of new blood vessels during embryogenesis as well as others pathological condition. Recently, a new role for VEGF as a neurotrophic factor has been emerged. In the developing nervous system, VEGF plays a pivotal role in neuronal proliferation and guidance of neuronal development process. As proangiogenic and neurotrophic factor, VEGF has been suggested to be involved in the pathogenesis of Alzheimer’s disease. In patients suffering fromthis disease patients abnormal regulation of VEGF expression have been reported. Moreover, an interaction between VEGF and b-amyloid has been evidenced in in vitro studies on cell cultures and in vivo studies conducted on transgenic lab animals. In consequence, these data have stimulated an increasing interest in assessing the therapeutic potential of VEGF pharmacological modulation in treatment of Alzheimer’s disease.
Choroby neurodegeneracyjne należą do najpoważniejszych schorzeń, z jakimi zmaga się obecnie medycyna. Wydaje się, iż obserwowany wzrost częstości występowania choroby Alzheimera w dużej mierze wiąże się z ogólnym starzeniem się ludzkiej populacji. Mimo intensywnych badań prowadzonych od kilkudziesięciu lat etiopatogeneza tej choroby nie jest poznana, nie znamy również leku, który przynajmniej hamowałby skutecznie postęp tej choroby. Naczyniowo-śródbłonkowy czynnik wzrostu (vascular endothelial growth factor, VEGF) jest dobrze scharakteryzowanym czynnikiem proangiogennym, niezbędnym do powstawania nowych naczyń krwionośnych zarówno podczas rozwoju zarodkowego, jak i w warunkach patologicznych. Badania przeprowadzone w ostatnich latach wskazały na nową rolę VEGF jako czynnika neurotroficznego. Podczas rozwoju układu nerwowego VEGF odgrywa kluczową rolę nie tylko w różnicowaniu i tworzeniu sieci naczyń w rozwijającym się mózgu, lecz także w proliferacji neuronów oraz w kierowaniu procesem rozwoju neuronalnego. Obecnie uważa się, że VEGF jako czynnik proangiogenny i neurotroficzny prawdopodobnie bierze udział w patogenezie choroby Alzheimera. U osób cierpiących na tę chorobę stwierdzono nieprawidłową regulację ekspresji VEGF. Zarówno w badaniach in vitro przeprowadzonych na hodowlach komórkowych, jak i w badaniach in vivo na zwierzęcych modelach transgenicznych stwierdzono występowanie interakcji między VEGF a b-amyloidem. Te przesłanki zainspirowały badaczy do podjęcia badań nad ewentualnym wykorzystaniem farmakologicznej modulacji VEGF w terapii choroby Alzheimera.
Źródło:
Aktualności Neurologiczne; 2011, 11, 2; 123-130
1641-9227
2451-0696
Pojawia się w:
Aktualności Neurologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of season on plasma concentration of insulin-like growth factor-I and 1.25-dihydroxycholecalciferol in horses
Wpływ sezonu na koncentrację insulinopodobnego czynnika wzrostu I oraz 1,25 dwuhydroksycholekalcyferolu w osoczu krwi koni
Autorzy:
Luszczynski, J.
Pieszka, M.
Powiązania:
https://bibliotekanauki.pl/articles/44817.pdf
Data publikacji:
2011
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
animal breed
horse
animal sex
vitamin D3
plasma concentration
insulin-like growth factor-1
1,25-dihydroxycholecalciferol
summer season
purebred Arabian breed
Anglo-Arabian horse
Hucul horse
winter season
feeding system
Opis:
During the summer season, plasma concentrations of insulin-like growth factor I (IGF-I) inArabian,Anglo-Arabian and Hucul horses as well as colts and fillies were higher compared to the winter season. Significant differences in IGF-I concentration between the seasons were found in Hucul horses (P≤0.01) and in colts (P≤0.05). Season had no significant effect on 1.25(OH)2-D3 concentration in the horse breeds studied. However, plasma concentrations of this hormone were always higher in the summer than in the winter season regardless of the breed (exceptAnglo-Arabians) and sex. Knowledge and monitoring of the physiological concentrations of IGF-1 and vitamin D3 metabolites in different seasons of the year, combined with analysis of growth rate during these periods may contribute to the improvement of the horse management and feeding system. Because of the association between these hormones and the frequency of developmental orthopaedic diseases, this information could be potentially used in veterinary practice.
W sezonie letnim koncentracja IGF-I w osoczu krwi koni czystej krwi arabskiej, angloarabskich i huculskich a także ogierków i klaczek była wyższa w porównaniu z sezonem zimowym. Istotne różnice w stężeniu IGF-I pomiędzy sezonami wykazano u koni huculskich (P≤0,01) i ogierków (P≤0,05). Nie stwierdzono istotnego wpływu sezonu na koncentrację 1,25(OH)2-D3 u badanych ras koni. Obserwowano jednak, że stężenie tego hormonu w osoczu krwi koni bez względu na rasę (oprócz koni angloarabskich) i płeć było zawsze wyższe w sezonie letnim niż zimowym. Znajomość i monitorowanie fizjologicznych stężeń IGF-I i metabolitów witaminy D3 w różnych porach roku w powiązaniu z analizą tempa wzrostu w tych okresach może przyczynić się do usprawnienia systemu utrzymania i żywienia koni. Ze względu na istniejący związek pomiędzy tymi hormonami a częstotliwością występowania ortopedycznych chorób rozwojowych informacje te mogą też być potencjalnie wykorzystane w praktyce weterynaryjnej.
Źródło:
Acta Scientiarum Polonorum. Zootechnica; 2011, 10, 3
1644-0714
Pojawia się w:
Acta Scientiarum Polonorum. Zootechnica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Is There any Improvement in Total Factor Productivity Growth of Indian Pharmaceutical Industry after TRIPS Agreement? : Evidence from Biennial Malmquist Index
Autorzy:
Pal, Dipyaman
Chakraborty, Chandrima
Ghose, Arpita
Powiązania:
https://bibliotekanauki.pl/articles/14459584.pdf
Data publikacji:
2018-09-27
Wydawca:
Wyższa Szkoła Bankowa we Wrocławiu
Tematy:
Total Factor Productivity Growth (TFPG)
TRIPS
Indian Pharmaceutical Industry
Data Envelopment Analysis (DEA)
Biennial Malmquist Index
Opis:
Aim: Indian Pharmaceutical Industry (IPI) has undergone a massive makeover–from a modest beginning of “process patents regime” in the seventies to a modern and WTO compatible regime under the Trade Related Intellectual Property Rights System (TRIPS) in 2005. This paper estimates Total Factor Productivity Growth (TFPG) of Indian Pharmaceutical Industry (IPI) using firm level data from 2000 to 2013.   Design / Research methods: We have used nonparametric approach of Data Envelopment Analysis (DEA) using Biennial Malmquist Index.   Conclusions / findings: The results of estimation suggest an increase in overall TFPG of IPI after TRIPS agreement and also those vertically integrated firms involved in both bulk drugs production and formulation activities are less productive compared to firms that are involved in production of only bulk drug or formulation activity.   Originality / value of the article: This paper examines whether productivity of IPI has increased after 2005 i.e. after the period of TRIPS, by estimating TFPG for two sub-periods, i.e., from 2000 to 2005 and 2006 to 2013.   Implications of the research: The decomposition of TFPG suggests that for overall period 2000-2013, scale changes are the most important factor causing the productivity changes and among the other two alternative sources of TFPG, efficiency change dominates over technical changes. For the sub-period 2006-2013, the improvement in the scale efficiency may push the firms to a higher TFPG, whereas for 2000-2005 the better utilization of factors of production is the main driver of TFPG. A second stage panel regression suggests that R&D expenditure, Marketing expenditure, Market size, Capital-Labour ratio, import intensity and export intensity have positive and significant influence on TFPG.
Źródło:
Central European Review of Economics and Management; 2018, 2, 3; 55-80
2543-9472
Pojawia się w:
Central European Review of Economics and Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GLOBALISATION EFFECT MEASURE VIA HIERARCHICAL DYNAMIC FACTOR MODELLING
Autorzy:
Reklaitė, Agnė
Powiązania:
https://bibliotekanauki.pl/articles/517170.pdf
Data publikacji:
2015
Wydawca:
Instytut Badań Gospodarczych
Tematy:
leading indicator
hierarchical dynamic factor model
globalisation
economic growth
Opis:
In this paper the issue of globalisation and deteriorating precision of domestically oriented frameworks is addressed. A hypothesis that the effect of international trends on the growth of economy is increasing over time is formed. In order to validate this, a method of composing foreign series with local indicators in a hierarchical dynamic factor model is presented. The novelty of this approach is that globalisation effect is measured focusing on prediction rather than similarity. This way the measure presents the country's sensitivity to global shocks and reveals how much focal country's economy is intertwined with global economy. The application was performed on the basis of Lithuanian data and the hypothesis was validated. The results indicate that globalisation effect has an increasing effect over time.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2015, 10, 3; 139-149
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of silicon in plant resistance to water stress
Rola krzemu w odpornosci roslin na stres wodny
Autorzy:
Sacala, E
Powiązania:
https://bibliotekanauki.pl/articles/13900.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
silicon
plant resistance
water stress
plant growth
environmental factor
Opis:
Agricultural productivity is strongly affected by different abiotic stresses, among which water stress is the major environmental constraint limiting plants growth. The primary reason for water stress is drought or high salt concentration in soil (salinity). Because both of these stress factors lead to numerous physiological and biochemical changes in plants and result in serious loss in yields, there is a pressing need for finding the effective ways for increasing crops’ resistance to stress factors. One of the alternative methods involving alleviation of negative stress effects might be application of silicon as a fertiliser (root or foliar supply). Many plants, particularly monocotyledonous species, contain large amounts of Si (up to 10% of dry mass). In spite of the high Si accumulation in plants (its amount may equal concentration of macronutrients), until now it has not been considered as an essential element for higher plants. Many reports have shown that silicon may play a very important role in increasing plant resistance to noxious environmental factors. Hence, Si is recognised as a beneficial element for plants growing under biotic and abiotic stresses. The main form of Si which is available and easily taken up by plants is monosilicic acid (H4SiO4). Plants take up Si from soil solution both passively and actively. Some dicotyledonous plants such as legumes tend to exclude Si from tissues – rejective uptake. These plants are unable to accumulate Si and they do not benefit from silicon. Under water stress conditions, silicon might enhance plants’ resistance to stress and ameliorate growth of plants. These beneficial effects may result from better and more efficient osomoregulation, improved plant water status, reduction in water loss by transpiration, maintenance of adequate supply of essential nutrients, restriction in toxic ions uptake and efficient functioning of antioxidative mechanisms. Based on the current knowledge and presented data, it can be concluded that the role of Si in plants is not restricted to formation of physical or mechanical barrier (as precipitated amorphous silica) in cell walls, lumens and intercellular voids. Silicon can also modulate plants’ metabolism and alter physiological activities, particularly in plants subjected to stress conditions. However, in some plants, increased silicon supply does not improve plant growth. Hence, a better understanding of the interactions between silicon application and plant responses will contribute to more efficient fertiliser practices, especially under stress conditions.
Produktywność roślin uprawnych jest w znacznym stopniu ograniczana przez różne abiotyczne czynniki stresowe, wśród których stres wodny jest jednym z głównych problemów, na który narażone są rośliny. Stres wodny najczęściej jest spowodowany suszą glebową lub nadmiernym zasoleniem gleb. Ponieważ te czynniki powodują liczne fizjologiczne i biochemiczne zmiany w roślinach oraz prowadzą do poważnych strat plonów, konieczne jest znalezienie skutecznych sposobów zwiększenia odporności roślin na stresy. Jednym ze sposobów pozwalających na złagodzenie ujemnych skutków stresu wodnego może być zasilanie roślin krzemem (w formie oprysku lub dodatku do podłoża). Wiele roślin, szczególnie jednoliściennych, zawiera duże ilości krzemu (do 10% s.m.). Pomimo że procentowa zawartość krzemu w roślinach może dorównywać zawartości makroelementów, to nie jest on uznawany za pierwiastek niezbędny do prawidłowego wzrostu i rozwoju roślin. Wyniki wielu badań wskazują jednak na ważną rolę krzemu w podnoszeniu odporności roślin na różne niekorzystne czynniki środowiska. Dlatego krzem jest uważany za pierwiastek wpływający korzystnie na rośliny, szczególnie poddane działaniu abiotycznych i biotycznych czynników stresowych. Główną formą krzemu dostępną dla roślin i łatwo przez nie pobieraną jest kwas ortokrzemowy (H4SiO4). Może on być pobierany z roztworu glebowego w sposób pasywny lub aktywny. Niektóre rośliny (głównie motylkowate) wykluczaj¹ krzem ze swoich tkanek (ang. rejective uptake). Rośliny te nie mają zdolności akumulowania tego pierwiastka, i w związku z tym nie mogą doświadczać jego korzystnego działania. W warunkach stresu wodnego krzem może zwiększać odporność roślin oraz poprawiać ich wzrost. Ten pozytywny wpływ może wynikać z: lepszej i bardziej sprawnej osmoregulacji, lepszego statusu wodnego, ograniczenia strat wody w procesie transpiracji, odpowiedniego zaopatrzenia w składniki mineralne, ograniczenia pobierania toksycznych jonów oraz sprawnego funkcjonowania mechanizmów antyoksydacyjnych. Opierając się na obecnym stanie wiedzy i przedstawionych danych, można stwierdzić, że rola krzemu nie ogranicza się jedynie do tworzenia mechanicznej lub fizycznej bariery (w postaci amorficznej krzemionki) w ścianach komórkowych, przestrzeniach międzykomórkowych oraz wewnątrz komórek. Pierwiastek ten może wpływać na metaboliczną i fizjologiczną aktywność roślin, szczególnie tych, które narażone są na niekorzystne wpływy środowiskowa. Jednakże w przypadku niektórych roślin nie stwierdzono pozytywnego wpływu krzemu na ich wzrost. Dlatego zrozumienie interakcji między zastosowaniem krzemu a reakcją roślin na ten pierwiastek przyczyni się do bardziej efektywnego nawożenia roślin, szczególnie w warunkach stresowych.
Źródło:
Journal of Elementology; 2009, 14, 3; 619-630
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Economic openness versus economic growth: a correlation study in long-term and short periods based on a selection of European Union countries
Autorzy:
Machowska-Okrój, Sylwia
Powiązania:
https://bibliotekanauki.pl/articles/969922.pdf
Data publikacji:
2016
Wydawca:
Akademia Ignatianum w Krakowie
Tematy:
Economic growth
economic openness factor
correlation research
positive dependency
Opis:
Objective: The objective of this paper is to show the connection between economic openness with economic growth and attempt to answer the following question: Did the accession to EU had any affect on correlation between economic growth and the economic openness? Research Design & Methods: The research method adopted here was a study of correlation among the variables. Program "Statistica" have been used to study this correalation. Economic growth plays the role of a dependent variable and is estimated according to GDP. An economy’s openness is an independent variable and is estimated by the openness factor calculated using this formula: the sum of exports and imports divided by GDP. Findings: Not all research agrees with the idea of the positive influence of openness in the economy on economic growth. In 2004, the former ‘Eastern Bloc’ countries (Czech Republic, Estonia, Hungary, Lithuania, Latvia, Poland, Slovak Republic, Slovenia) joined the European Union, offering an opportunity to study the effects of accession. Implications & Recommendations: The study has been divided into two phases. The first phase examines the relation between the economic growth rate and the openness factor for the 24 countries which were members of the EU in 2004. The results show a positive correlation between the studied variables. Afterwards, each of the eight listed countries were researched concerning two time periods: the first from before their accession to the EU and the second after their accession to the EU. Correlation research does not satisfactorily settle this aspect. In the second phase of the study, a longer time horizon was allowed and the former Eastern Bloc countries were researched again. The results were explicit and credible. A positive and statistically substantial correlation for the researched countries was achieved. Contribution & Value Added: On the basis of the conducted research the following conclusions were drawn.An analysis of the correlation between economic growth and economic openness shows a positive dependency with the following assumptions: the researched group consists of the 24 EU countries in 2004 and the research is done within the 2004-2015 period.The twice-run correlation research for the time periods 1995-2004 and 2004-2015 respectively and for the eight selected countries does not present explicit results. Consequently, it cannot be concluded that accession to the EU has positively influenced the correlation between economic growth and economic openness.The correlation research for 1995-2015 and the eight selected countries do confirm the popularity of the idea of the positive influence of the economic openness on economic growth.
Źródło:
Horyzonty Polityki; 2016, 7, 21; 141-165
2082-5897
Pojawia się w:
Horyzonty Polityki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
W jaki sposób słabiej rozwinięta gospodarka może dogonić liderów? Znaczenie zagregowanej produktywności
How a less developed economy can catch up with the leaders? The role of aggregate productivity
Autorzy:
Orłowski, Witold
Powiązania:
https://bibliotekanauki.pl/articles/31343829.pdf
Data publikacji:
2024
Wydawca:
Kancelaria Sejmu. Biuro Ekspertyz i Oceny Skutków Regulacji
Tematy:
total factor productivity
economic growth
growth accounting
technological progress
industrial policy
Productivity Strategy 2030
Opis:
There exist many examples of countries that have seriously reduced, over the past 150 years, the development gap vis-à-vis economic leaders. The decisive factor was the rapid increase of the total factor productivity (TFP), possible due to the technological progress. In the article, the author verified 6 important hypotheses underlying the Productivity Strategy 2030 published by the Polish government, on the basis of the experience of 96 countries around the world over the last 60 years. Most of these hypotheses were positively verified. However, when implementing the Strategy, one should remember that the increase in the aggregate productivity observed throughout the economy is only the combined effect of the increase in productivity occurring at the enterprise level. Therefore, the pursuit of more developed countries requires, first of all, the creation of appropriate conditions for the development of enterprises.
Źródło:
Studia BAS; 2024, 1(77); 7-28
2080-2404
2082-0658
Pojawia się w:
Studia BAS
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of physico-chemical conditions on the shape of growth curves of Anodonta anatina (Linnaeus, 1758)
Autorzy:
Czarnoleski, M.
Dragosz-Kluska, D.
Labecka, A.M.
Muller, T.
Powiązania:
https://bibliotekanauki.pl/articles/83865.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
physicochemical condition
shape
growth curve
Anodonta anatina
life strategy
biotic factor
abiotic factor
female
male
lake
Źródło:
Folia Malacologica; 2012, 20, 1
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the compliance of aircraft wing flap with use of the fracture mechanics
Autorzy:
Kłysz, S.
Baran, M.
Powiązania:
https://bibliotekanauki.pl/articles/243350.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
airplane wing flap
crack growth
stress intensity factor
Irwin-Kies theory
Opis:
Research in the field of fracture mechanics and determination of material characteristics are used for practical purposes, such as the assessment of static and dynamic strength of structural components, analysis of their fatigue life or extending the life span of their operation. A structural component, considered to be safe from fatigue cracking point of view, was investigated and results were presented in this article. In particular, an analysis was made to determine the stress intensity factor for the cracked wing flap construction, based on static and fatigue tests, using the Irwin-Kies theory. The flap with a service crack was subjected to fatigue tests with a load similar to the one registered during flight measurements. The flap without a service crack was subjected to static tests, after cutting the cracks of specified lengths and shapes (similar to the service crack) in the skin of the flap. The article presents changing the length of the flap crack in subsequent load cycles, change in the maximum values of force and the crack opening displacement in subsequent load cycles, dependence of P-COD in the first and second stage of fatigue testing of the wing flap, dependence of the wing flap compliance on the length of the crack and experimentally determined dependence for wing flap. The occurrence of a flap crack up to approximately 230 mm does not cause a significant growth of the stress intensity factor.
Źródło:
Journal of KONES; 2018, 25, 4; 547-554
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Success factors for micro and small agribusiness enterprises (MSEs) - the case of Ghana
Autorzy:
Asuming Boakye, A.
Ampadu-Ameyaw, R.
Essegbey, G.O.
Onumah, J.A.
Powiązania:
https://bibliotekanauki.pl/articles/43874.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu. Wydawnictwo Uczelniane
Tematy:
Ghana
micro-enterprise
small enterprise
success factor
entrepreneurship
economic growth
business success
Źródło:
Journal of Agribusiness and Rural Development; 2018, 47, 1
1899-5241
Pojawia się w:
Journal of Agribusiness and Rural Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of light and gravity on growth directions in a root system of Cucumis sativus L.
Autorzy:
Otreba, P
Powiązania:
https://bibliotekanauki.pl/articles/57921.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
plant architecture
growth response
growth
root system
phototropism
growing
lateral root
gravity
gravitropism
seedling
light
environmental factor
Cucumis sativus
light condition
behaviour
Opis:
While each individual root responds to such environmental factors as light or gravity the question arises how these reactions subordinate to the whole root system, which is supposed to maintain its primary functions. Data presented here confirm that in cucumber the gravity and light modulate the growth direction of the lateral roots subunits of the system. Another important factor affecting behavior of lateral roots is an orientation of the main root. These facts all together suggest that the root system functions as an integrated entity, capable of adapting its architecture to changing environmental conditions. Its flexibility, based on unknown signaling network, guarantees optimal functioning of the system.
Źródło:
Acta Societatis Botanicorum Poloniae; 2009, 78, 1; 7-12
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nitric oxide trascriptional players during seed dormancy and germination
Autorzy:
Albertos, P.
Mateos, I.
Fernandez-Arbaizar, A.
Romero-Puertas, M.
Lorenzo, O.
Powiązania:
https://bibliotekanauki.pl/articles/80484.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
nitric oxide
seed dormancy
germination
phytohormone
abscisic acid
plant growth regulator
transcription factor
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On constant-weight TSP-tours
Autorzy:
Jones, Scott
Kayll, P.
Mohar, Bojan
Wallis, Walter
Powiązania:
https://bibliotekanauki.pl/articles/743167.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
graph labelling
complete graph
travelling salesman problem
Hamilton cycle
one-factor
two-factor
k-factor
constant-weight
local matching conditions
edge label growth-rate
Sidon sequence
well-spread sequence
Opis:
Is it possible to label the edges of Kₙ with distinct integer weights so that every Hamilton cycle has the same total weight? We give a local condition characterizing the labellings that witness this question's perhaps surprising affirmative answer. More generally, we address the question that arises when "Hamilton cycle" is replaced by "k-factor" for nonnegative integers k. Such edge-labellings are in correspondence with certain vertex-labellings, and the link allows us to determine (up to a constant factor) the growth rate of the maximum edge-label in a "most efficient" injective metric trivial-TSP labelling.
Źródło:
Discussiones Mathematicae Graph Theory; 2003, 23, 2; 287-307
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gibberellin metabolism pathway activity with relation to LEC2 and FUS3 transcription factors during the induction phase of Medicago truncatula cv. Jemalong somatic embryogenesis
Autorzy:
Igielski, R.
Kepczynska, E.
Powiązania:
https://bibliotekanauki.pl/articles/951238.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
somatic embryogenesis
totipotency
hormone
transcription factor
leafy cotyledon2
plant growth regulator
Medicago sativa
gibberellin
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2015, 96, 1
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Is the division of Western and Eastern Poland still valid? The evolution of regional convergence in Poland
Autorzy:
Misiak, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/2058085.pdf
Data publikacji:
2022-07-11
Wydawca:
Uniwersytet Ekonomiczny w Poznaniu
Tematy:
club convergence
catch-up eefct
log(t) convergence test
economic growth
time-varying factor model
Opis:
The primary aim of the paper is the empirical vericfiation of the hypothesis on the convergence of real GDP per capita of the regions (NUTS-2) in Poland and the catch-up eefct of Eastern towards Western Poland. The empirical study is based on a relatively new analytical approach of Phillips and Sul convergence tests which consider signicfiant diefrences in technological advancement between regions. The results show that the convergence hypothesis was rejected in the group of all regions of Poland and the group of Western Poland regions. Convergence was conrfimed in the group of Eastern Poland regions. The strict catch-up eefct of the Eastern towards the Western Poland regions was not observed. Nevertheless, thirteen of seventeen regions of Poland were characterised by convergence but within distinct convergence clubs. The identicfiation of convergence clubs, however, was not determined by a sharp EastWest Poland dividing line.
Źródło:
Economics and Business Review; 2022, 8, 2; 145-169
2392-1641
Pojawia się w:
Economics and Business Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wzrost gospodarczy a zatrudnienie w Polsce w latach 1995–2014
Economic Growth in View of Employment Poland in Years 1995–2014
Autorzy:
Kotlorz, Dorota
Sojka, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/596451.pdf
Data publikacji:
2017
Wydawca:
Łódzkie Towarzystwo Naukowe
Tematy:
wzrost gospodarczy
bezzatrudnieniowy wzrost gospodarczy
współczynnik absorpcji siły roboczej
kryzys gospodarczy
economic growth
employment non-augmenting growth rate
labour force absorption factor
economic crisis
Opis:
Wzrost gospodarczy jest jednym z warunków kształtujących rynek pracy. Dodatnia zależność obu tych kategorii co do zasady nie budzi wątpliwości, ale bardziej skomplikowana jest kwestia ilościowych relacji zachodzących między nimi. W opracowaniu podjęto próbę analizy zależności między stopami wzrostu PKB i liczby pracujących w Polsce w latach 1995–2014 oraz próbę ustalenia charakteru wzrostu gospodarczego w badanym okresie. Starano się uzyskać odpowiedź na kilka pytań badawczych, tj.: Jaka była dynamika zmian PKB i liczby pracujących w latach 1995–2014? Jak kształtował się współczynnik absorbcji zatrudnienia w różnych okresach rozwoju polskiej gospodarki oraz w wybranych sekcjach gospodarki? Jaka jest granica bezzatrudnieniowego wzrostu gospodarczego w Polsce? Z przeprowadzonych badań wynika, że rynek pracy stosunkowo późno reagował na wzrost gospodarczy, zatrudnienie wzrastało dopiero wtedy, gdy stopa wzrostu gospodarczego kształtowała się na poziomie ok. 4,5%.
Economic growth is one of the determinants shaping the labour market. Generally, there is no doubt that there is a positive relationship between these two categories, however the issue of quantitative relationships observed between them is more complicated. The paper attempts to analyse the relationship between GDP growth rates and the number of working people in Poland between 1995 and 2014, as well as to determine the nature of economic growth over the studied period. The paper also seeks to answer several research questions, i.e. What was the dynamics of GDP changes and the number of working people between 1995 and 2014? What was the employment absorption rate in different periods of Polish economy development and in selected economy sectors? What is the limit of jobless economic growth in Poland? Results of conducted research show that the labour market relatively slowly reacted to economic growth, and employment was increasing only when economic growth rate reached the level of about 4.5%.
Źródło:
Studia Prawno-Ekonomiczne; 2017, 105; 259-275
0081-6841
Pojawia się w:
Studia Prawno-Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dekompozycje czynnikowe przyrostu wartości dodanej brutto według sekcji PKD i województw
Factor decompositions of gross value added growth by NACE sections and voivodships
Autorzy:
Kotlewski, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/962826.pdf
Data publikacji:
2019
Wydawca:
Główny Urząd Statystyczny
Tematy:
czynniki produkcji
wynagrodzenie czynników produkcji
zasoby czynników produkcji
total factor productivity
dekompozycje wartości dodanej brutto
zatrudnieni
pracujący
production factors
factor remunerations
factor stocks
total factor productivity
gross value added growth decompositions
employees
employed persons
Opis:
Celem artykułu jest wykazanie, że wykonanie dekompozycji przyrostu wartości dodanej brutto w czterech wariantach umożliwia pogłębienie obserwacji procesów zachodzących w gospodarce. Warianty te uzyskano na podstawie dwóch zasadniczych dychotomii. Pierwsza dotyczyła dekompozycji na kontrybucje wynagrodzeń czynników produkcji z jednej strony oraz na kontrybucje zasobów czynników produkcji i ich produktywności (total factor productivity – TFP) z drugiej strony. Druga polegała na wykonaniu dekompozycji równolegle dla zatrudnionych oraz dla pracujących. Opracowana metodologia umożliwiła dokonanie obliczeń dla lat 2001–2015 na poziomie zagregowanym według sekcji PKD, województw oraz jednocześnie sekcji i województw. Przeprowadzono je na podstawie danych z Banku Danych Lokalnych i rachunków narodowych GUS. Wyniki potwierdzają, że wykonanie dekompozycji według ww. dychotomii umożliwia pogłębienie analiz wzrostu gospodarczego, co jest szczególnie istotne w aspekcie regionalnym.
The aim of this paper is to demonstrate that performing gross value added growth decompositions in four variants makes it possible to deepen the observation of economic processes. These variants have been obtained on the basis of two fundamental dichotomies. The first of them involved performing a decomposition of the gross value added growth into the contributions of production factor remunerations, and, in parallel, a decomposition into the contributions of production factor stocks and total factor productivity (TFP). The second dichotomy involved performing separate but parallel decompositions for employees and for employed persons. The devised methodology made it possible to perform computations for the years 2001–2015 at the aggregate level, according to NACE sections, according to voivodships and according to both the NACE sections and the voivodships. The decompositions were performed basing on Statistics Poland’s data from the Bank of Local Data and the National Accounts. The presented results confirm that performing decompositions according to the two above-mentioned dichotomies makes it possible to deepen the analyses of the economic growth, which is especially important in the regional aspect.
Źródło:
Wiadomości Statystyczne. The Polish Statistician; 2019, 64, 9; 37-59
0043-518X
Pojawia się w:
Wiadomości Statystyczne. The Polish Statistician
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kapitał wiedzy i osiągnięcia gospodarcze a dynamika rozwoju społeczno-gospodarczego krajów
Knowledge Capital and economic achievements versus the dynamics of socio-economic growth in countries
Autorzy:
Soszyńska, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/1194908.pdf
Data publikacji:
2011-01-01
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
knowledge capital
economic growth
total factor productivity
technology
kapitał wiedzy
wzrost gospodarczy
ogólna produktywność czynników produkcji
technologia
Opis:
Artykuł stanowi przyczynek do dyskusji na temat relacji między kapitałem wiedzy a wzrostem gospodarczym. Autorka przeprowadza - zarówno w kontekście teoretycznym, jak i poprzez proces weryfikacji empirycznej - analizę relacji między kapitałem ludzkim (kapitałem edukacji) a osiągnięciami i wzrostem gospodarczym krajów. Badaniem objęty został również wpływ sektora B+R na wzrost gospodarczy w sposób bezpośredni, jak i pośrednio, poprzez kanał ogólnej produktywności czynników produkcji. Analizowana jest m.in. interakcja między kapitałem edukacji i kapitałem nauki z jednej strony a odległością od światowej granicy technologicznej z drugiej. Autorka poszukuje również innych warunków koniecznych stymulujących wzrost gospodarczy.
This article contributes to the discussion concerning the relation between knowledge Capital and economic growth. The author draws on theoretical background and empirical verification in order to analyse the relation between human capital (educational Capital) and countries' economic performance and economic growth. The analysis also looks at the nexus R&D capital and economic growth, both directly and indirectly, through the total factor productivity channel. The paper discusses, among others, the interaction between educational capital and R&D capital on the one hand, and, on the other, the country distance from the world technology frontier. Other essential drivers of economic growth and TFP growth are also explored.
Źródło:
Nauka i Szkolnictwo Wyższe; 2011, 1, 37; 178-212
1231-0298
Pojawia się w:
Nauka i Szkolnictwo Wyższe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wzrost gospodarczy, konwergencja technologiczna oraz ich determinanty – analiza ekonometryczna
Economic growth, technological convergence and their determinants – (an econometric analysis)
Autorzy:
Soszyńska, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/453397.pdf
Data publikacji:
2011
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:
wzrost gospodarczy
technologia
ogólna produktywność czynników produkcji
gotowość technologiczna
economic growth
technology
total factor productivity
technological readness
Opis:
Artykuł stanowi przyczynek do dyskusji nad wpływem wiedzy, w szczególności wiedzy technologicznej we wzroście gospodarczym, w sposób bezpośredni jak i pośrednio poprzez kanał ogólnej produktywności czynników produkcji. Podkreślona jest konieczność tworzenia odpowiedniego potencjału społeczno- technologicznego na rzecz tworzenia wiedzy technologicznej oraz jej adaptacji. Nie zachodzi konwergencja technologiczna między krajami znajdującymi się w różnych stadiach rozwoju społeczno-gospodarczego, jeśli nie kontrolowany jest poziom zdolności kraju na rzecz tworzenia i absorpcji wiedzy.
This article represents a contribution to the discussion on the technological influence on the economic growth, directly and indirectly through total factor productivity channel. It is emphasized the necessity of the suitable social - technological capabilities creation for technological knowledge generation and adaptation.
Źródło:
Metody Ilościowe w Badaniach Ekonomicznych; 2011, 12, 2; 343-356
2082-792X
Pojawia się w:
Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth responses of Picea abies to climate in the central part of the Ceskomoravska Upland (Czech Republic)
Autorzy:
Rybnicek, M.
Cermak, P.
Zid, T.
Kolar, T.
Powiązania:
https://bibliotekanauki.pl/articles/41537.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
growth response
Picea abies
Norway spruce
precipitation
temperature
climate
environmental factor
tree ring
biomass
Ceskomoravska Upland
Czech Republic
Opis:
The aims of the study were to determine the effect of temperatures and precipitation on the ring width and to compare the results with the results of previous studies conducted in other mountain ranges of the Czech Republic. The research was performed in the central part of the Ceskomoravská Upland in the vicinity of Herálec municipality in selected 70- up to 110-year-old spruce stands at altitudes from 680ma.s.l. to 779 m a.s.l. Measuring of tree-ring widths and synchronization of individual ring series were conducted in PAST4. The age trend was removed by ARSTAN and climatic effects were modelled in DendroClim2002. The correlation of tree-ring width with monthly precipitation is positive and statistically significant for July of the previous year and for the entire summer period from June to September of the current year. The correlation of tree-ring width with mean monthly temperatures is negative and statistically significant for July and September and positive and statistically significant for October of the previous year. Negative correlation was also found for temperatures of the entire summer period from June to September of the previous year. The regional tree-ring chronology mainly shows two periods of highly reduced increment: from 1992 to 1996 and from 2003 to the end of the analysed period. The results thus confirm the hypothesis that the tree-ring width is in positive correlation with summer precipitation and negative correlation with summer temperatures. Also the results of the habitual diagnostics have shown a relatively low degree of crown transformation which indicates a weak or short-term stress load.
Źródło:
Dendrobiology; 2012, 68
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wzrost gospodarczy w krajach Europy Środkowo-Wschodniej na tle wybranych krajów wschodzących
Economic Growth Paths in Central and Eastern European Countries and in Selected Emerging Economies
Autorzy:
Rapacki, Ryszard
Próchniak, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/575551.pdf
Data publikacji:
2012-02-29
Wydawca:
Szkoła Główna Handlowa w Warszawie. Kolegium Analiz Ekonomicznych
Tematy:
wzrost gospodarczy
konwergencja
rachunek wzrostu
łączna produktywność czynników wytwórczych
TFP
kraje Europy Środkowo-Wschodniej
economic growth
convergence
growth accounting
total factor productivity (TFP)
Central and Eastern Europe
Opis:
The paper offers an empirical analysis of economic growth paths in two groups of countries. The first group consists of 10 Central and Eastern European (CEE10) countries. The second group constitutes a benchmark and encompasses 29 emerging economies in other regions of the world. The authors compare the growth paths of the CEE10 countries and the reference emerging economies. They use two econometric methods to test their research hypotheses: income-level convergence analysis and growth accounting exercise. The existence of convergence is checked using linear regression equations estimated with the least squares method (the explanatory variable is the rate of real GDP per capita growth in the case of β convergence and standard GDP per capita deviation between countries in the case of σ convergence. Total factor productivity (TFP), on the other hand, is calculated using the residual method, by subtracting from the overall rate of real GDP growth the average weighted growth rate of measurable factors of production: labor and physical capital. The main findings from the analysis are as follows: (1) individual CEE countries and the CEE10 group, as a whole, displayed relatively fast economic growth, compared with the remaining 29 emerging economies; (2) the analysis did not confirm that the fast economic growth of the CEE10 countries (in comparison with the other emerging economies) resulted from the mechanism of absolute convergence. There were signs, however, that the former group was subject to conditional β convergence; (3) rapid economic growth in the CEE10 countries was to a large extent (more considerably than in other analyzed countries) driven by the increase in total factor productivity.
Artykuł przedstawia empiryczną analizę ścieżek wzrostu gospodarczego dwóch grup krajów. Pierwsza obejmuje 10 państw Europy Środkowo-Wschodniej (EŚW-10). Druga grupa stanowi punkt odniesienia i uwzględnia 29 gospodarek wschodzących z innych regionów świata. Analiza dotyczy okresu 1993-2007. W artykule porównano ścieżki wzrostu gospodarczego krajów EŚW-10 i pozostałych krajów wschodzących. Do weryfikacji hipotez badawczych wykorzystano analizę konwergencji dochodowej i rachunek wzrostu gospodarczego. Występowanie zjawiska zbieżności weryfikowano za pomocą równań regresji liniowej, które estymowano metodą najmniejszych kwadratów (zmienną objaśnianą jest tempo wzrostu realnego PKB per capita w przypadku zbieżności β lub odchylenie standardowe PKB per capita między krajami w przypadku zbieżności σ). Natomiast łączną produktywność czynników wytwórczych (TFP) policzono metodą rezydualną, odejmując od tempa wzrostu realnego PKB ogółem średnie ważone tempo wzrostu mierzalnych czynników wytwórczych: pracy i kapitału rzeczowego. Główne wnioski z przeprowadzonej analizy są następujące: (1) Poszczególne kraje Europy Środkowo-Wschodniej oraz grupa EŚW-10 jako całość zanotowały względnie szybki wzrost gospodarczy w porównaniu z pozostałymi 29 krajami odniesienia. (2) Badanie nie potwierdziło, aby szybki wzrost gospodarczy krajów EŚW-10 (w porównaniu z krajami referencyjnymi) wynikał z mechanizmu konwergencji absolutnej, chociaż okazuje się, że analizowane kraje rozwijały się zgodnie z hipotezą konwergencji warunkowej typu β. (3) Szybki wzrost gospodarczy krajów EŚW-10 był w dużym (znacznie większym niż w pozostałych badanych krajach) stopniu determinowany przez wzrost łącznej produktywności czynników wytwórczych.
Źródło:
Gospodarka Narodowa. The Polish Journal of Economics; 2012, 253, 1-2; 65-96
2300-5238
Pojawia się w:
Gospodarka Narodowa. The Polish Journal of Economics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rape glucosinolates and alfalfa saponins as allelopathic factors for lettuce seeds germination
Autorzy:
Waligora, D
Powiązania:
https://bibliotekanauki.pl/articles/66032.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
glucosinolate
allelopathic factor
development
root hair
allelopathy
seed
germination
seed germination
oilseed rape
alfalfa
saponin
seedling growth
lettuce
Opis:
Secondary plant substances - glucosinolates and saponins reduced seed germination and seedling growth of lettuce. Saponins showed greater inhibitory effect on both germination and growth of lettuce seedlings than glucosinolates. The effect depended on the concentration of these compounds in the ground. Tested compounds caused abbreviation of roots, browning their tips and prevented root hair development.
Testowano wpływ roślinnych metabolitów wtórnych: saponin lucerny i glukozynolanów rzepaku na kiełkowanie nasion sałaty. Stwierdzono hamujący wpływ obu badanych związków na kiełkowanie. Znacznie silniejsze działanie wykazywały saponiny, przy czym efekt ten zależny był od ich stężenia w podłożu. Badane związki wpływały nie tylko na liczbę skiełkowanych nasion, ale również na wygląd siewek (skrócenie korzonków, brunatnienie ich końców, brak włośników).
Źródło:
Journal of Plant Protection Research; 1997, 37, 1-2
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sustainable growth rate, corporate value of US firms within capital and labor market distortions: The moderating effect of institutional quality
Autorzy:
Bagh, Tanveer
Naseer, Mirza Muhammad
Khan, Muhammad Asif
Pypłacz, Paula
Oláh, Judit
Powiązania:
https://bibliotekanauki.pl/articles/39827486.pdf
Data publikacji:
2023
Wydawca:
Instytut Badań Gospodarczych
Tematy:
factor market distortion
capital and labor market distortions
corporate value
institutional quality
corporate sustainable growth rate
micro-level analysis
Opis:
Research background: Understanding how distortions in capital and labor markets affect corporate value and sustainable growth is crucial in today's economy. These distortions can disrupt resource allocation and economic sustainability. Additionally, the role of institutional quality in shaping these dynamics requires thorough exploration. Purpose of the article: We quantify the effect of capital and labor market distortions on corporate value and sustainable growth rate (SGR) and how this association is moderated by institutional quality. Methods: Stemming from the sample criteria, we calibrated a final sample of 1971 United States-listed manufacturing firms for 2012–2022. This research offers insights into market inefficiencies and institutional effects. Progressing towards objectives, we use advanced techniques like feasible generalized least squares and generalized methods of moments. These methods help us rigorously analyze complex relationships among study variables. Findings & value added: Three key findings emerge: first, capital and labor market distortions have a negative and significant influence on corporate value and sustainable growth. Our primary finding implies that increasing distortions significantly reduce sustainable growth's value and potential. Second, we find institutional quality has a positive significant effect on corporate value and sustainable growth. Third, institutional quality positively moderates the association between capital and labor market distortions, corporate value, and sustainable growth. Findings suggest that institutional quality, as a potential mechanism, improves the efficiency of resource allocation and optimizes the sustainable economic system to lessen the negative effect of factor market distortions on corporate value and SGR. Besides, we conduct robustness checks to validate our findings. Finally, we offer policymakers and stakeholders actionable insights.
Źródło:
Oeconomia Copernicana; 2023, 14, 4; 1211-1255
2083-1277
Pojawia się w:
Oeconomia Copernicana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nierówności ekonomiczne a pułapka średniego poziomu rozwoju. Wnioski dla Polski
Economic inequality and the middle-income trap. Implications for Poland
Autorzy:
Kowalski, Ryszard
Powiązania:
https://bibliotekanauki.pl/articles/2127622.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet w Białymstoku. Wydawnictwo Uniwersytetu w Białymstoku
Tematy:
teoria wzrostu gospodarczego
pułapka średniego poziomu rozwoju
łączna produktywność czynników wytwórczych
nierówności ekonomiczne
growth theory
middle income trap
total factor productivity
economic inequality
Opis:
Cel – W pracy scharakteryzowano kontrowersje definicyjne związane z empirycznym ujęciem zjawiska pułapki średniego poziomu rozwoju, zbadano relacje zachodzące między nierównościami ekonomicznymi a pułapką średniego poziomu rozwoju oraz oceniono znaczenie nierówności jako potencjalnej bariery dla wzrostu gospodarczego w Polsce w długookresowej perspektywie. Metoda badań – Do oceny wpływu nierówności na wzrost gospodarczy i ich znaczenia jako czynnika ryzyka dla trwałości wzrostu gospodarczego w Polsce wykorzystano metodę analizy i krytyki piśmiennictwa oraz posłużono się danymi statystycznymi publikowanymi przez OECD. Wyniki – Ograniczenia empirycznych ujęć zjawiska pułapki są związane z arbitralnością założeń dotyczących okresu oraz poziomu dochodu wyznaczających uwięzienie kraju w pułapce średniego poziomu dochodu. Analiza wykazała, że większość spowolnienia wzrostu gospodarczego w przypadku krajów „złapanych” w pułapkę wynika z obniżenia wzrostu łącznej produktywności czynników wytwórczych oraz że duże nierówności ekonomiczne negatywnie oddziałują na determinanty produktywności, w konsekwencji na wzrost gospodarczy. Ze względu na umiarkowany poziom nierówności dochodowych wydaje się jednakże, że w przypadku Polski większe znaczenie mogą mieć inne wewnętrzne bariery wzrostu niż nierówności. Oryginalność/wartość – Świadomość roli, jaką nierówności ekonomiczne pełnią w procesie wzrostu łącznej produktywności czynników wytwórczych, ma kluczowe znaczenie dla wypracowania odpowiednich rozwiązań w zakresie polityki publicznej, służących uniknięciu pułapki.
Purpose – This paper examines empirical controversies about the middle-income trap concept and presents the analysis of the relationship between economic inequality and the middle income trap. It also discusses the significance of inequality as a potential barrier for Poland’s economic growth in the long-term perspective. Research method – A critical literature review and data from OECD statistics database were used to assess the impact of inequalities on economic growth and the significance of inequality as a risk factor for Poland’s economic growth. Results – Empirical approaches are subject to the limitations as they rely on arbitrary assumptions to define time and income thresholds when assessing whether a country is caught in a middle-income trap. The analysis shows that the growth slowdown in the countries “trapped” at the middle-income level result mainly from the slowdown of the total factor productivity growth and that high levels of inequality have negative impact on productivity determinants, therefore on growth. However, given the moderate level of income inequality, it seems that in the case of Poland some other internal barriers to growth are among the most important ones. Originality/value – Understanding the role of economic inequality in explaining total factor productivity growth is crucial in devising appropriate policy measures that may help to avoid the middle-income trap.
Źródło:
Optimum. Economic Studies; 2019, 2(96); 37-52
1506-7637
Pojawia się w:
Optimum. Economic Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of KLEMS Economic Productivity Accounts in Poland
Implementacja rachunku produktywności gospodarki KLEMS w Polsce
Autorzy:
Kotlewski, Dariusz Cezary
Błażej, Mirosław
Powiązania:
https://bibliotekanauki.pl/articles/657740.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
rachunek produktywności
KLEMS
czynniki produkcji
czynniki pierwotne
czynnik praca
czynnik kapitał
przyrost produktywności
dekompozycja
kompozycja pracy
godziny przepracowane
pracownicy
godziny na pracownika
productivity accounting
production factor
primary factors
labour factor
capital factor
productivity growth
decompositions
labour composition
hours worked
employees
hours per employee
Opis:
Celem artykułu jest pokazanie, w jaki sposób zrealizowano rachunek produktywności gospodarki KLEMS dla Polski. Głównym problemem badawczym było znalezienie sposobu uporania się ze specyficznym dla kraju niedostatkiem danych. W związku z tym postawiono hipotezę, że dzięki pewnym innowacyjnym, ale akceptowalnym technikom oszacowania brakujących danych możliwe jest dostarczenie odpowiednich danych do tego rachunku dla Polski. Po zaprezentowaniu podstawowych informacji o rachunku produktywności gospodarki KLEMS oraz metodologii w artykule pokazano, jak zostały rozwiązane specyficzne problemy, które ujawniły się z danymi.
The aim of the article is to demonstrate how the KLEMS economic productivity accounts for Poland have been performed. The main research problem was to find solutions to certain country‑specific data insufficiencies. On this basis, a hypothesis was put forward that by using some innovative but acceptable missing data assessment techniques, it is possible to supply sufficient data for Poland for the mentioned accounts. After an overview of KLEMS economic productivity accounts and the relevant fundamental methodology, the article presents further how specific data problems that have arisen have been solved.    
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2018, 2, 334
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control of Aedes aegypti larvae with Aea-TMOF mimics: aromatic derivatives of enoic acid
Autorzy:
Borovsky, D.
Powiązania:
https://bibliotekanauki.pl/articles/55331.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
insecticide
insect growth inhibition
enoic acid
Aedes aegypti
bioorganic insecticide
trypsin biosynthesis
trypsin modulating oostatic factor
mosquito
insect
organic mimics
larva
gut receptor
Opis:
Based on the 3D conformation of the N-terminus of TMOF in solution, six aromatic derivatives of enoic acid: 7-biphenyl-4-yl-hept-4-enoic acid (BPHE), 7-(4-butyl-phenyl)-hept-4-enoic acid (BuPHE), 7-cyclohexyl-hept-4-enoic acid (CyHE), 10-phenyl-dec-7-enoic acid (PDE), 7-p-tolyl-hept-2-enoic acid ethyl ester (THEEE) and 7-(4-methoxy-phenyl)-hept-2-enoic acid ethyl ester (MPEEE) were computer-modeled and synthesized. Treating first instar Aedes aegypti larvae with different concentrations of the TMOF mimics showed that addition of butyl to the benzyl ring, use of p-tolyl or converting the benzyl ring into cyclohexane increased the biological activity of the mimics by 5.2, 5.0 and 3.8-fold, respectively. Esterifying the carboxyl terminus into ethyl ester and addition of a methoxy group to the benzyl ring also increased, by 2-fold, the biological activity of the derivative. The position of the double bond in the aliphatic chain is important for enhanced biological activity. Aea-TMOF and CyHE fed to mosquito larvae equally inhibited trypsin biosynthesis in larvae for the first 24 h. The biological activity of CyHE, however, rapidly declined 2-3 days later, whereas TMOF activity stayed stable. These results indicate that TMOF organic mimics, although potent, need to be formulated in order to be more stable for future field applications.
Źródło:
Pestycydy; 2008, 1-2; 27-34
0208-8703
Pojawia się w:
Pestycydy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessing surface fatigue crack growth in railway wheelset axle
Autorzy:
Rudavskyi, D. V.
Kaniuk, Yu. I.
Duriagina, Z. A.
Kulyk, V. V.
Shefer, M. S.
Dolinska, I. Ya.
Powiązania:
https://bibliotekanauki.pl/articles/1818483.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
fatigue crack growth
mixed mode
railway axles
stress intensity factor
estimation model
wzrost pęknięć zmęczeniowych
tryb mieszany
osie kolejowe
współczynnik intensywności naprężeń
model szacowania
Opis:
Purpose: The aim of the proposed research is to create a calculation model of surface fatigue crack growth at the axle of railway wheelset working under operational loads. Design/methodology/approach: The energy approach of the fracture mechanics was used to formulate the calculation model of fatigue crack propagation at the wheelset axle surface. The method of least squares was used to determine the investigated material mechanical constants that the kinetic equations of the calculation model contain. The system of differential equations of crack growth kinetics was solved numerically using the Runge-Kutta method. Findings: On the basis of the energy approach of the fracture mechanics the calculation model of fatigue macrocrack growth in three-dimensional elastic-plastic body in case of a mixed-mode I+II+III macromechanism of fracture has been built. On the basis of the created calculation model, the kinetics of the growth of fatigue cracks was investigated both in the middle part of the wheelset axle and in the axle journal. Research limitations/implications: The results obtained on laboratory specimens should be tested during a real railway wheelset axle investigation. Practical implications: The created calculation model can be used in practice to formulate method of residual lifetime estimation of railway wheelset axle. Originality/value: It was shown, that surface crack kinetics depends not only on the crack initial area but also significantly depends on the crack edge geometry and comparatively small crack-like defects at the wheelset axle surface can reach critical sizes in comparatively short run. It has been found that mechanical shear stresses caused by the weight of the loaded railway wagon in the cross section of the wheelset axle journal can significantly accelerate the growth of the transverse fatigue crack at the axle surface, reducing the period of crack subcritical growth by about 20%.
Źródło:
Archives of Materials Science and Engineering; 2020, 106, 2; 59--67
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dolny Śląsk jako najdynamiczniejszy region w kraju - efekt statystyczny czy rzeczywisty wszechstronny rozwój?
Lower Silesia - the Most Dynamic Region in Poland. Statistical Effect or Real Versatile Development?
Autorzy:
Cybulski, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/585599.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Analiza czynnikowa
Analiza statystyczna
Innowacyjność regionu
Rozwój regionalny
Wzrost gospodarczy regionu
Economic growth of the region
Factor analysis
Regional development
Regional innovation
Statistical analysis
Opis:
Regional development analyses are often affected by simplifications coming from heuristic reasoning. It is assumed that the Lower Silesia region has the highest growth rate since 2005 due to proper configuration of growth factors. But this hypothesis is false when one takes into account persistent high unemployment rate and low employment, average innovativeness, increase in interregional disproportions and low domestic demand due to slow increase of households' disposable incomes. Author tries to identify real sources of the Lower Silesias economic growth.
Źródło:
Studia Ekonomiczne; 2015, 209; 42-53
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Natural Aging and Fatigue Crack Propagation Rate on Welded and Non-Welded Aluminum Alloy (AA2219-T87)
Autorzy:
Ijaz, Mudasir
Qayyum, Faisal
Elahi, Hassan
Ullah, Mudaser
Eugeni, Marco
Badshah, Saeed
Gaudenzi, Paolo
Powiązania:
https://bibliotekanauki.pl/articles/102921.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
natural aging
AA2219
crack growth rate
structure health
fatigue
microstructure
stress intensity factor
naturalne starzenie się
tempo wzrostu pęknięć
zmęczenie
mikrostruktura
współczynnik intensywności stresu
Opis:
Aluminum alloys are widely used for fabrication of aircraft, civil structures, and space vehicles. Fatigue life consideration of a material is the most important design criteria in many such critical applications. In this research work, a widely used Aluminum alloy AA2219-T87 was TIG welded using AA2319 as a filler material. The effect of natural aging on Fatigue Crack Propagation Rate (FCPR) of welded and non-welded compact tension (CT) specimens (AA2219˗T87) is studied. The relationship between stress intensity factor (ΔK) and crack ratio (a/W) for different value of the crack length in base metal and the welded zone is presented. Paris curves for both welded and non-welded specimens and compared to study the effect of natural aging (NA) on FCGR and compared with non-aged specimens. The results obtained provide a base for the development of Structural Health Monitoring systems for the propagation of crack growth in such components.
Źródło:
Advances in Science and Technology. Research Journal; 2019, 13, 3; 129-143
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanism of fatigue crack growth of bridge steel structures
Mechanizm rozwoju pęknięć zmęczeniowych stalowych konstrukcji mostów
Autorzy:
Zhu, H.
Powiązania:
https://bibliotekanauki.pl/articles/231146.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
współczynnik intensywności naprężenia
metoda elementów skończonych
metoda rozszerzona
symulacja
rozwój pęknięć
pęknięcie zmęczeniowe
most
stress intensity factor
extended method
finite element method
simulation
fatigue crack
crack growth
bridge
Opis:
This study was carried out on the background of Sutong Bridge project based on fracture mechanics, aiming at analyzing the growth mechanism of fatigue cracks of a bridge under the load of vehicles. Stress intensity factor (SIF) can be calculated by various methods. Three steel plates with different kinds of cracks were taken as the samples in this study. With the combination of finite element analysis software ABAQUS and the J integral method, SIF values of the samples were calculated. After that, the extended finite element method in the simulation of fatigue crack growth was introduced, and the simulation of crack growth paths under different external loads was analyzed. At last, we took a partial model from the Sutong Bridge and supposed its two dangerous parts already had fine cracks; then simulative vehicle load was added onto the U-rib to predict crack growth paths using the extended finite element method.
Ostatnimi laty, wraz z gwałtownym rozwojem chińskiego przemysłu transportowego, budowa mostów w Chinach weszła w nowy etap rozwoju robiąc duży krok naprzód i coraz więcej mostów rzecznych i morskich wyrasta z ziemi, a mosty te stały się niezastąpioną osią chińskiej sieci transportowej. Konstrukcja stalowa jest głównym komponentem budowy mostu; jednakże, może ulec zniszczeniu poprzez ciągłe obciążanie doprowadzając w ten sposób do pęknięć zmęczeniowych. Wraz ze wzrostem budowy mostów zwiększa się liczba fatalnych wypadków spowodowanych pęknięciami zmęczeniowymi, prowadząc do wysokich praktycznych wymagań dotyczących bezpieczeństwa i niezawodności konstrukcji. Współczynnik intensywności naprężenia (WIN) i kryteria rozwoju pęknięć to dwa kluczowe problemy w mechanice pęknięć. Metody obliczania WIN obejmują metodę analityczną i numeryczną, przy czym numeryczna metoda obejmuje metodę elementów skończonych, metodę objętości skończonej oraz metodę elementów brzegowych itd. Metoda elementów skończonych jest najczęściej stosowana do obliczania WIN, a metody obliczania WIN obejmują metodę zależną od przemieszczeń, wirtualną metodę zamykania szczelin, metodę całki J itd. Teoretyczny proces dedukcji WIN jest skomplikowany. Dla różnych modeli pęknięć zmiany warunków brzegowych spowodują brak przydatności pierwotnej metody obliczeniowej, tak więc należy wydedukować nową metodę obliczeniową. Dlatego symulacja elementów skończonych jest obecnie szeroko stosowana do modelowania obliczeń różnych modeli, ponieważ może znacząco skrócić czas tradycyjnych obliczeń, jak również poprawić ich wydajność. Na podstawie mechaniki pękania przestudiowano WIN oraz ścieżki rozwoju pęknięć biorąc za przykład model mostu „Sutong”, zasymulowano małe pęknięcia na dwóch niebezpiecznych częściach mostu oraz zastosowano obciążenie pojazdem względem ceownika, aby przewidzieć ścieżki rozwoju pęknięć.
Źródło:
Archives of Civil Engineering; 2016, 62, 4/I; 153-169
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fem analysis of pressure vessel with an investigation of crack growth on cylindrical surface
Analiza mes zbiornika ciśnieniowego z badaniem rozwoju pęknięć na powłoce walcowej
Autorzy:
Balac, M.
Grbovic, A.
Petrovic, A.
Popovic, V.
Powiązania:
https://bibliotekanauki.pl/articles/301614.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
XFEM
pressure vessel
3D digital image correlation
stress intensity factor
crack growth
rozszerzona metoda elementów skończonych (XFEM)
zbiornik ciśnieniowy
cyfrowa korelacja obrazu 3D
współczynnik intensyfikacji naprężeń
rozwój pęknięć
Opis:
To ensure reliability of pressure vessels during service it is necessary to (1) know properties of materials used in their design and (2) evaluate vessels’ behaviour under different working conditions with satisfying accuracy. Due to various technical and/or technological requirements, nozzles are usually welded on vessel’s shell producing geometrical discontinuities that reduce the safety factor. To evaluate their influence, vessels with two different nozzles were experimentally studied and critical areas for crack initiation have been identified by 3D Digital Image Correlation (DIC) method. After that, the numerical analysis of equivalent 3D finite element model was performed and obtained results were compared with experimental values. In the most critical area, next to the one of the nozzles, crack was initiated and then growth of the damage was simulated using extended finite element method (XFEM). In this paper evaluation of stress intensity factors (SIFs) along crack path is presented, as well as the most probable direction of the crack propagation on the shell. Based on SIFs values, critical length of the crack and number of pressure cycles to the final failure were estimated.
Aby zapewnić niezawodność zbiorników ciśnieniowych podczas pracy, konieczna jest (1) znajomość właściwości materiałów zastosowanych do ich konstrukcji oraz (2) wystarczająco dokładna ocena zachowania zbiornika w różnych warunkach pracy. Ze względu na różne wymagania techniczne i/lub technologiczne, króćce zwykle spawa się do płaszcza zbiornika, w wyniku czego powstają geometryczne nieciągłości, które zmniejszają współczynnik bezpieczeństwa. Aby ocenić ich wpływ, przeprowadzono eksperymentalne badania zbiorników z dwoma różnymi króćcami i określono obszary krytyczne dla inicjacji pęknięć wykorzystując metodę trójwymiarowej cyfrowej korelacji obrazu (DIC). Następnie przeprowadzono analizę numeryczną równoważnego modelu elementów skończonych 3D, a uzyskane wyniki porównano z wartościami eksperymentalnymi. W najbardziej krytycznym obszarze, w pobliżu jednego z króćców, inicjowano pęknięcie, a następnie symulowano rozwój uszkodzenia przy użyciu rozszerzonej metody elementów skończonych (XFEM). W artykule przedstawiono ocenę współczynników intensyfikacji naprężeń (SIF) wzdłuż ścieżki pękania oraz najbardziej prawdopodobnego kierunku propagacji pęknięć na płaszczu zbiornika. Na podstawie wartości SIF, oszacowano krytyczną długość pęknięcia i liczbę cykli ciśnieniowych do ostatecznego uszkodzenia.
Źródło:
Eksploatacja i Niezawodność; 2018, 20, 3; 378-386
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metodologia rachunku produktywności KLEMS i jego implementacja w warunkach polskich
The methodology of using account KLEMS productivity and its implementation in Polish conditions
Методология использования счета производительности KLEMS и реализация в польских условиях
Autorzy:
Kotlewski, Dariusz
Błażej, Mirosław
Powiązania:
https://bibliotekanauki.pl/articles/962670.pdf
Data publikacji:
2016-09
Wydawca:
Główny Urząd Statystyczny
Tematy:
rachunek produktywności
KLEMS
czynniki produkcji
czynniki pierwotne
czynnik praca
czynnik kapitał
przyrost produktywności
dekompozycja
kompozycja pracy
godziny przepracowane
pracownicy
godziny na pracownika
KLEMS Growth and Productivity Accounts
production factors
the primary factors
labor factor
capital factor
productivity increase
decomposition
work composition
worked hours
employees
hours per worker
счет производительности
факторы
производства
основные факторы
фактор труда
фактор капитала
рост производительности труда
разложение
состав труда
количество отработанных часов
сотрудники
часы на одного сотрудника
Opis:
W artykule omówiono pochodzenie i status rachunku produktywności KLEMS. Podano szczegóły metodologiczne rachunku, przedstawiono jego międzynarodowy kontekst oraz aspekty implementacyjne w warunkach polskich. Wskazano, że rachunek ten jest prowadzony w GUS. Opisano dostępność danych wykorzystywanych do rachunku w Polsce oraz zaprezentowano metodę uwzględnienia w tych rachunkach pracy i kapitału.
The article presents the origins of the KLEMS Growth and Productivity Accounts, that is descendant from the Solow’s well known economic growth decomposition. They discuss further the methodological details of the Accounts, present the international context and the implementation aspects of the KLEMS Growth and Productivity Accounts in Poland, that is actually being performed in the Central Statistical Office of Poland (CSO). They focus on the specific data environment for this productivity accounts in Poland. Specific techniques of data pre-calculation are presented for the two primary factors — labour and capital.
В статье рассматривается происхождение и состояние счета производительности KLEMS. Были сообщены методологические детали счета, был представлен также его международный контекст и аспекты использования в польских условиях. Было отмечено, что учетная запись проводится в ЦСУ. Авторы представили доступность данных, используемых для счета в Польше, а также представили метод включения в эти счета труда и капитала.
Źródło:
Wiadomości Statystyczne. The Polish Statistician; 2016, 9; 86-108
0043-518X
Pojawia się w:
Wiadomości Statystyczne. The Polish Statistician
Dostawca treści:
Biblioteka Nauki
Artykuł
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