title: Polyphenols action against oxidative stress formation in endothelial cells.
abstract: The aim of this study was to investigate the influence of epigallocatechin-3-gallate (EGCG), theaflavins (TFs) and black tea extract (BTE) on oxidative stress formation as well as on antioxidant system of human vein endothelial cells (HUVEC). HUVEC were incubated for 0,5 h with 100 mM tert-butyl hydroperoxide (t-BHP) for oxidative stress formation. The influence of EGCG, TFs, and BTE on oxidative stress and antioxidant system parameters was investigated by the pre-incubation for 2 h with 50 mg/mL of each compound. Half hour exposure to t-BHP caused statistically significant decrease in GSH-Px activity and in the content of GSH, vitamin A, vitamin E as well as tryptophan. Moreover, pretreatment of cells with t-BHP caused statistically significant increase in activities of Cu,Zn-SOD, GSSG-R and in the level of MDA and dityrosine. Pretreated with t-BHP endothelial cells, subjected to EGCG, TFs and black tea extract, are partially protected against oxidative activity of t-BHP causing statistically significant increase in GSH-Px activity, GSH and tryptophan level and decrease in MDA and dityrosine level in comparison with HUVEC pretreated with t-BHP group. These results indicate the beneficial effect of tea polyphenolic compounds on HUVEC antioxidant abilities and, in consequence, their protective effect in cell components.
authors.affiliation: Department of Analytical Chemistry, Medical University of Białystok, Mickiewicza 2a, 15-222 Białystok, Poland.
authors.forename: Wojciech
authors.initials: W
authors.lastname: Łuczaj
authors.forename: Ewa
authors.initials: E
authors.lastname: Zapora
authors.forename: Marek
authors.initials: M
authors.lastname: Szczepański
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Wnuczko
authors.forename: Elzbieta
authors.initials: E
authors.lastname: Skrzydlewska
mesh_terms: D044946:Biflavonoids / Q000494:pharmacology; D002392:Catechin / Q000031:analogs & derivatives / Q000494:pharmacology; D002478:Cells, Cultured; D042783:Endothelial Cells / Q000187:drug effects* / Q000378:metabolism; D005419:Flavonoids / Q000494:pharmacology*; D006801:Humans; D008315:Malondialdehyde / Q000032:analysis; D018384:Oxidative Stress / Q000187:drug effects*; D010636:Phenols / Q000494:pharmacology*; D059808:Polyphenols; D013482:Superoxide Dismutase / Q000378:metabolism; D020122:tert-Butylhydroperoxide / Q000494:pharmacology
chemical_list: D044946:Biflavonoids; D005419:Flavonoids; D010636:Phenols; D059808:Polyphenols; C056068:theaflavin; D008315:Malondialdehyde; D002392:Catechin; D020122:tert-Butylhydroperoxide; C045651:epigallocatechin gallate; D013482:Superoxide Dismutase