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Wyświetlanie 1-5 z 5
Tytuł:
In vivo effect of diallyl sulfide and cimetidine on phenacetin metabolism and bioavailability in rat.
Autorzy:
Szutowski, Mirosław
Zalewska, Katarzyna
Jadczak, Marta
Marek, Monika
Powiązania:
https://bibliotekanauki.pl/articles/1043835.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
diallyl sulfide
cimetidine
phenacetin
Opis:
Numerous cytochrome P450 inhibitors have been described as effective modulators of cytochrome P450 isoforms activity in vitro. Their inhibitory efficiency may be considerably modified after in vivo application. The aim of this study was to examine the effect of oral administration of diallyl sulfide - a cytochrome P450 2E1 inhibitor and cimetidine - a cytochrome P450 2C6 and 2C11 inhibitor on rat serum concentration of phenacetin and its metabolite acetaminophen. Both inhibitors increased area under the curve (AUC04h) for phenacetin by 50%. Only cimetidine reduced AUC04h for acetaminophen indicating inhibition of O-deethylation activity. Quinidine - a cytochrome P450 2D subfamily and P-glycoprotein inhibitor did not change significantly phenacetin bioavailability. These results suggest that diallyl sulfide inhibits the deacetylation pathway catalysed by arylamine N-acetyl transferase. Beside cytochrome P450 1A2 other cytochrome P450 isoforms (2A6 and/or 2C11) are involved in phenacetin O-deethylation in rat.
Źródło:
Acta Biochimica Polonica; 2002, 49, 1; 249-256
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The chaperone-usher pathway of bacterial adhesin biogenesis - from molecular mechanism to strategies of anti-bacterial prevention and modern vaccine design*
Autorzy:
Piątek, Rafał
Zalewska, Beata
Bury, Katarzyna
Kur, Józef
Powiązania:
https://bibliotekanauki.pl/articles/1041367.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
chaperone-usher pathway
pili
adhesion
fimbriae
Opis:
The chaperone-usher system determines the biogenesis of surface-exposed adhesive structures responsible for virulence of many Gram-negative bacteria. Investigations of the last 20 years have resolved the mechanism of this pathway on a structural level for different species of pathogenic bacteria. The purpose of this review is to present the molecular mechanisms of the biogenesis of adhesive structures assembled via the chaperone-usher pathway. The obtained mechanistic data allow one to propose potential strategies of anti-bacterial action. Additionally, the specific properties of the polymeric adhesive structures (pili and fimbriae) of the chaperone-usher system allow their use as effective and safe recombinant vaccines carrying foreign epitopes in thousands of copies on bacterial cell surface.
Źródło:
Acta Biochimica Polonica; 2005, 52, 3; 639-646
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The activity of antioxidant enzymes in colorectal adenocarcinoma and corresponding normal mucosa
Autorzy:
Strzelczyk, Joanna
Wielkoszyński, Tomasz
Krakowczyk, Łukasz
Adamek, Brygida
Zalewska-Ziob, Marzena
Gawron, Katarzyna
Kasperczyk, Janusz
Wiczkowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1039648.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
antioxidant enzymes
corresponding normal mucosa
colorectal adenocarcinoma
oxidative stress
Opis:
Oxidative stress is one of several factors which contribute to the development of colorectal carcinogenesis. The aim of the study was an assessment of the activity of antioxidant enzymes in tumour and corresponding normal distal mucosa in a group of patients with colorectal adenocarcinoma. Samples of tumour and corresponding normal mucosa were obtained during a resection of colorectal cancer from 47 patients aged between 26 and 82 years. The average distance of corresponding normal distal mucosa from the tumour was 4.49 cm. Activities of antioxidant enzymes: superoxide dismutase (SOD), glutathione reductase (GR), glutathione peroxidase (GPx), glutathione S-transferase (GST), and catalase (CAT) were measured in tissue homogenates. The patients were grouped according to the tumour stage (Duke's staging), grading, localization, and size of tumour, as well as age and sex. Statistical analysis was performed. The activity of SOD and GPx was considerably increased, while the activity of GST decreased significantly in tumour as compared with normal mucosa. GR activity in colorectal cancer was evidently higher in tumours of proximal location compared with the distal ones. The distance of corresponding normal distal mucosa from the tumour was analyzed and related to all assayed parameters. A decreased GST activity was observed in corresponding normal mucosa more than 5 cm distant from the tumour in patients with CD Duke's stage. The higher activity of superoxide dismutase and glutathione peroxidase in tumour compared to corresponding normal mucosa could indicate higher oxidative stress in colorectal adenocarcinoma cells.
Źródło:
Acta Biochimica Polonica; 2012, 59, 4; 549-556
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Clinical and prognostic value of hTERT mRNA expression in patients with non-small-cell lung cancer
Autorzy:
Zalewska-Ziob, Marzena
Dobija-Kubica, Katarzyna
Biernacki, Krzysztof
Adamek, Brygida
Kasperczyk, Janusz
Bruliński, Krzysztof
Ostrowska, Zofia
Powiązania:
https://bibliotekanauki.pl/articles/1038550.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
non-small-cell lung cancer
telomerase
hTERT expression
survival rate
prognosis
Opis:
Telomerase, undetectable in normal somatic cells, plays a critical role in carcinogenesis of the majority of human tumors including lung carcinoma. The aim of our study was to determine human telomerase reverse transcriptase (hTERT) mRNA expression in patients with non-small cell lung cancer (NSCLC) in order to estimate its usefulness as diagnostic and/or prognostic factor. hTERT expression was analyzed in a group of 12 females and 28 males with NSCLC using Quantitative Real-Time Polymerase Chain Reaction (QRT-PCR method) in cancerous and non-cancerous lung tissues. Results were analyzed according to clinical data and one-, two-, and five-year survival rates. hTERT expression in the cancerous tissue was significantly higher than in the lung parenchyma free from neoplasm infiltration (p<0.05). There was no significant association between hTERT expression in the tumor tissue and age, gender, grading or clinical stage. A significant difference in hTERT expression between two types of histopathological patterns (adenocarcinoma and squamous cell carcinoma) was detected (p=0.01). No association between hTERT expression in NSCLC specimens and survival rates was found. hTERT mRNA detection by QRT-PCR in tumor and corresponding cancer-free tissues can be used as a diagnostic marker in patients with NSCLC, but seems not to be a prognostic factor.
Źródło:
Acta Biochimica Polonica; 2017, 64, 4; 641-646
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Activity of lysosomal exoglycosidases in submandibular glands of rats intoxicated by cadmium at doses related to human chronic environmental and occupational exposures.
Autorzy:
Zalewska, Anna
Brzó;ska, Małgorzata
Marciniak, Justyna
Karaszewska, Katarzyna
Zwierz, Krzysztof
Moniuszko-Jakoniuk, Janina
Powiązania:
https://bibliotekanauki.pl/articles/1041566.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
exoglycosidases
β-galactosidase
α-mannosidase
cadmium
salivary glands of rats
β-N-acetylhexosaminidase
Opis:
Work in cadmium (Cd) smelter and smoking cigarettes damages teeth and oral mucosa which are protected by tissue and salivary glycoconjugates: glycoproteins, glycolipids, and proteoglycans. We worked out a rat model imitating human "environmental" and "occupational" exposure to cadmium using 5 mg Cd and 50 mg Cd/l in drinking water, respectively. In submandibulary glands of exposed to Cd rats, we found the time and dose dependent accumulation of Cd and simultanous decrease in activity of β-N-acetylhexosaminidase (HEX). In homogenates of submandibulary glands of control rats, β-N-acetylhexosaminidase showed the highest activity. The activities of α;-mannosidase and β-galactosidase were very low. None of these exoglycosidases were inhibited by Cd even at 44 mM concentration.
Źródło:
Acta Biochimica Polonica; 2004, 51, 3; 831-837
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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