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Wyszukujesz frazę "metabolism" wg kryterium: Wszystkie pola


Tytuł:
The ins and outs of maternal-fetal fatty acid metabolism
Autorzy:
Bobiński, Rafał
Mikulska, Monika
Powiązania:
https://bibliotekanauki.pl/articles/1038991.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
fatty acids
fetal metabolism
pregnancy
Opis:
Fatty acids (FAs) are one the most essential substances in intrauterine human growth. They are involved in a number of energetic and metabolic processes, including the growth of cell membranes, the retina and the nervous system. Fatty acid deficiency and disruptions in the maternal-placental fetal metabolism of FAs lead to malnutrition of the fetus, hypotrophy and preterm birth. What is more, metabolic diseases and cardiovascular conditions may appear later in life. Meeting a fetus' need for FAs is dependent on maternal diet and on the efficiency of the placenta in transporting FAs to fetal circulation. "Essential fatty acids" are among the most important FAs during the intrauterine growth period. These are α-linolenic acid, which is a precursor of the n-3 series, linoleic acid, which is a precursor of the n-6 series and their derivatives, represented by docosahexaenoic acid and arachidonic acid. The latest studies have shown that medium-chain fatty acids also play a significant role in maternal-fetal metabolism. These FAs have significant effect on the transformation of the precursors into DHA, which may contribute to a relatively stable supply of DHA - even in pregnant women whose diet is low in FAs. The review discusses the problem of fatty acid metabolism at the intersection between a pregnant woman and her child with reference to physiological pregnancy, giving birth to a healthy child, intrauterine growth restriction, preterm birth and giving birth to a small for gestational age child.
Źródło:
Acta Biochimica Polonica; 2015, 62, 3; 499-507
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of daidzein, a soy isoflavone, on bone metabolism in Cd-treated ovariectomized rats
Autorzy:
Om, Ae-Son
Shim, Jae-Young
Powiązania:
https://bibliotekanauki.pl/articles/1041054.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
soy isoflavone
bone metabolism
daidzein
Opis:
This study compared the ability of daidzein, a soy isoflavone, with that of 17β-estradiol to prevent bone loss in cadmium (Cd)-exposed ovariectomized (OVX) rats during growth. Four week-old female Wistar rats were randomly assigned to five treatment groups of 9 rats each, either (1) sham-operated (SH); (2) OVX and placed on experimental diets (OVX); (3) OVX fed 50 ppm of CdCl2 (OVX-Cd); (4) OVX fed 50 ppm of CdCl2 and 10 µg of daidzein per kg of body mass (OVX-CD-D); or (5) OVX fed 50 ppm of CdCl2 and 10 µg of estrogen per kg of body mass (OVX-CD-E). All rats were given free access to AIN-76 modified diet and drinking water, with or without Cd, for 8 weeks. The OVX groups gained more (P < 0.05) body mass than the SH group. Femoral mass was increased by feeding daidzein and estradiol, whereas femoral length was not (P > 0.05) significantly different among groups. Femoral breaking force was not significantly different among groups, however, femoral BMD was significantly lower in OVX-Cd than in the SH and OVX groups. Morphologically proliferative cartilage and hypertrophic cells in femur showed normal distribution in OVX-Cd-D and OVX-Cd-E groups unlike those in OVX-Cd group. These findings suggest that Cd-OVX-induced osteopenia or osteoporosis probably results from an increase in bone turnover.
Źródło:
Acta Biochimica Polonica; 2007, 54, 3; 641-646
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Starch metabolism in leaves
Autorzy:
Orzechowski, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/1040696.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
chloroplast
starch degradation
starch biosynhesis
Opis:
Starch is the most abundant storage carbohydrate produced in plants. The initiation of transitory starch synthesis and degradation in plastids depends mainly on diurnal cycle, post-translational regulation of enzyme activity and starch phosphorylation. For the proper structure of starch granule the activities of all starch synthase isoenzymes, branching enzymes and debranching enzymes are needed. The intensity of starch biosynthesis depends mainly on the activity of AGPase (adenosine 5'-diphosphate glucose pyrophosphorylase). The key enzymes in starch degradation are β-amylase, isoamylase 3 and disproportionating enzyme. However, it should be underlined that there are some crucial differences in starch metabolism between heterotrophic and autotrophic tissues, e.g. is the ability to build multiprotein complexes responsible for biosynthesis and degradation of starch granules in chloroplasts. The observed huge progress in understanding of starch metabolism was possible mainly due to analyses of the complete Arabidopsis and rice genomes and of numerous mutants with altered starch metabolism in leaves. The aim of this paper is to review current knowledge on transient starch metabolism in higher plants.
Źródło:
Acta Biochimica Polonica; 2008, 55, 3; 435-445
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sclerostin and bone metabolism markers in hyperthyroidism before treatment and interrelations between them
Autorzy:
Sarıtekin, İlker
Açıkgöz, Şerefden
Bayraktaroğlu, Taner
Kuzu, Fatih
Can, Murat
Güven, Berrak
Mungan, Görkem
Büyükuysal, Çağatay
Sarıkaya, Selda
Powiązania:
https://bibliotekanauki.pl/articles/1038540.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
hyperthyroidism
sclerostin
bone metabolism markers
Opis:
Sclerostin, which is a glycoprotein produced by osteocytes, reduces the formation of bones by inhibiting the Wnt signal pathway. Thyroid hormones are related with Wnt signal pathway and it has been reported that increased thyroid hormones in hyperthyroidism fasten epiphysis maturation in childhood, and increase the risk of bone fractures by stimulating the bone loss in adults. The aim of this study was to examine the sclerostin serum levels, the relation between sclerostin and thyroid hormones as well as the biochemical markers of the bone metabolism in patients with hyperthyroidism (including multinodular goiter and Graves' disease), whose treatments have not started yet. No difference was found in the serum sclerostin levels between the hyperthyroidism group (n=24) and the control group (n=24) (p=0.452). The serum osteocalcin levels and 24-hour urinary phosphorus excretion were found to be higher in the hyperthyroid group than in the control group (p<0.001, p=0.009). A positive correlation was determined between the sclerostin and bone alkaline phosphatase levels (p<0.001); a negative correlation between the osteocalcin and thyroid stimulating hormone (TSH) (p<0.05); a positive correlation between the osteocalcin and thyroid hormones (FT3,FT4) (p<0.001); and a positive correlation between the deoxypyridinoline and hydroxyproline (p<0.001). No correlation was determined between sclerostin and TSH,FT3,FT4 (p>0.05). Therefore, we consider that a long-term study that covers the pre-post treatment stages of hyperthyroidism, including both the destruction and construction of the skeleton would be more enlightening. Moreover, the assessment of the synthesis of sclerostin in the bone tissue and in the serum level might show differences.
Źródło:
Acta Biochimica Polonica; 2017, 64, 4; 597-602
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Japanese quince (Chaenomeles japonica L.) fruit polyphenolic extract modulates carbohydrate metabolism in HepG2 cells via AMP-activated protein kinase
Autorzy:
Zakłos-Szyda, Małgorzata
Pawlik, Nina
Powiązania:
https://bibliotekanauki.pl/articles/1038525.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
AMPK
diabetes
glucose metabolism
HepG2
Japanese quince
polyphenols
Opis:
Type 2 diabetes mellitus (T2D) is a chronic diet-related disease which due to many dangerous complications has become a prominent health problem of the world. The aim of the study was to explore the in vitro activity of Japanese quince (Chaenomeles japonica L., family Rosaceae, JQ) fruit polyphenolic extract as modulator of carbohydrates metabolism. The research was designed to investigate the effect of JQ polyphenolic extract on glucose metabolism in human hepatoma HepG2 cell line cultured under normal non-metabolically changed and hyperglycemic conditions. Pretreatment of the cells with JQ preparation caused decrease of intracellular ROS generation and influenced mitochondrial membrane polarization which seemed to lead to AMPK activation. Further effects observed in HepG2 cells were associated with activation of the enzyme: elevation of glucose uptake and glycogen content, and alleviation of gluconeogenesis through modulation of PEPCK, PTP1B, FOXO1 and GLUT2/4 expression. These findings suggest that JQ polyphenols exhibit hypoglycemic effects via modulation of AMPK signaling in hepatocytes.
Źródło:
Acta Biochimica Polonica; 2018, 65, 1; 67-78
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of thyme and tea tree oils on morphology and metabolism of Candida albicans
Autorzy:
Rajkowska, Katarzyna
Kunicka-Styczyńska, Alina
Maroszyńska, Marta
Dąbrowska, Mariola
Powiązania:
https://bibliotekanauki.pl/articles/1039294.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Candida albicans
essential oils
morphology
metabolism
enzymatic activity
biochemical properties
Opis:
Members of Candida species cause significant problems in medicine and in many industrial branches also. In order to prevent from Candida sp. development, essential oils are more and more frequently applied as natural, non-toxic, non-pollutive and biodegradable agents with a broad spectrum of antimicrobial activity. The aim of the research was to determine changes in morphology and metabolic properties of Candida albicans in the presence of thyme and tea tree oils. Changes of enzymatic activity of isolates were observed in the presence of both tested essential oils, and they were primarily associated with loss or decrease of activity of all enzymes detected for control. Furthermore, only for 3 out of 11 isolates additional activity of N-acetyl-β-glucosaminidase, α-mannosidase, α-fucosidase and trypsin was detected. Vivid changes in biochemical profiles were found after treatment with tea tree oil and they were related to loss of ability to assimilate d-xylose, d-sorbitol and d-trehalose. The main differences in morphology of isolates compared to the control strain concerned formation of pseudohyphae structures. Both examined essential oils caused changes in cell and colony morphology, as well as in the metabolism of Candida albicans. However, the extent of differences depends on the type and concentration of an essential oil. The most important finding is the broad spectrum of changes in yeast enzymatic profiles induced by thyme and tea tree oils. It can be supposed that these changes, together with loss of ability to assimilate saccharides could significantly impact Candida albicans pathogenicity.
Źródło:
Acta Biochimica Polonica; 2014, 61, 2; 305-310
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Skin metabolism established with the use of MetaSite for selected retinoids employed in topical and systemic treatment of various skin disorders and found in cosmeceuticals
Autorzy:
Słoczyńska, Karolina
Gunia-Krzyżak, Agnieszka
Żelaszczyk, Dorota
Waszkielewicz, Anna
Marona, Henryk
Powiązania:
https://bibliotekanauki.pl/articles/1039091.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
cytochrome P450
MetaSite
retinoids
skin metabolism
Opis:
Purpose. Besides being widely used in cosmetics, retinoids are potent therapeutic agents used topically and systemically as anti-acne agents. The aim of this study was to predict with the use of MetaSite the skin metabolism of selected retinoids employed in treatment of skin disorders and found in cosmeceuticals. The following compounds were studied: retinol, retinaldehyde, retinoic acid, retinyl acetate, retinyl palmitate, acitretin, etretinate, adapalene and bexarotene. Methods. MetaSite, Molecular Discovery Ltd. is a computational model that enables prediction of cytochrome P450-dependant metabolism. This software indicates atoms in the molecule structure that are mostly vulnerable to metabolic changes and predicts the metabolite structures. Results. MetaSite indicated that retinol and retinal metabolites were obtained through hydroxylation of the methyl group located in the position 3 of the aliphatic chain, whereas retinoic acid biotransformation would occur principally in the carbon atom situated in the position 4 in the cyclohexene ring. In acitretin molecule, carbon atom of the methoxy group attached to the benzene ring displayed the highest probability of biotransformation. In etretinate, metabolic reactions would occur principally on the carbon atom of the final ethyl group of the molecule. Conclusions. MetaSite metabolism predictions for retinoic acid, acitretin, etretinate, adapalene and bexarotene were in agreement with experimental findings. In case of compounds being converted by catalysts other than cytochrome P450 enzymes, the primary metabolites predicted by MetaSite differ from those reported previously. In conclusion, MetaSite is a useful tool that can aid identification of the major metabolites of compounds being administered topically.
Źródło:
Acta Biochimica Polonica; 2015, 62, 2; 201-206
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł

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