title: Green tea protection against age-dependent ethanol-induced oxidative stress.
abstract: Ethanol intoxication leads to oxidative stress, which may be additionally enhanced by aging. The aim of this study was to investigate the influence of green tea as a source of water-soluble antioxidants on the ability to prevent oxidative stress in aged rats sub-chronically intoxicated with ethanol. Two-, 12-, and 24-mo-old male Wistar rats were divided into 4 experimental groups: (1) control, (2) green tea, (3) ethanol, and (4) ethanol and green tea. Ethanol intoxication produced age-dependent decrease in the activity of serum superoxide dismutase, glutathione peroxidase, and reductase and in levels of glutathione (GSH), vitamins C, E, and A, and beta-carotene. Changes in the serum antioxidative ability were accompanied by enhanced oxidative modification of lipid (increase in lipid hydroperoxides, malondiadehyde, and 4-hydroxynonenal levels) and protein (rise in carbonyl group levels). Green tea partially protected against changes in antioxidant enzymatic as well as nonenzymatic parameters produced by ethanol and enhanced by aging. Administration of green tea significantly protects cellular components such as lipids and proteins against oxidative modification. Results indicate that green tea effectively protects blood serum against oxidative stress produced by ethanol as well as aging.
authors.affiliation: Department of Analytical Chemistry, Medical University of Białystok, Białystok, Poland.
authors.forename: Wojciech
authors.initials: W
authors.lastname: Łuczaj
authors.forename: Ewa
authors.initials: E
authors.lastname: Waszkiewicz
authors.forename: Elzbieta
authors.initials: E
authors.lastname: Skrzydlewska
authors.forename: Wiesława
authors.initials: W
authors.lastname: Roszkowska-Jakimiec
mesh_terms: D000375:Aging; D020268:Alcohol-Induced Disorders, Nervous System / Q000517:prevention & control*; D000818:Animals; D000975:Antioxidants / Q000494:pharmacology / Q000627:therapeutic use*; D005979:Glutathione Peroxidase / Q000097:blood; D005980:Glutathione Reductase / Q000097:blood; D008297:Male; D018384:Oxidative Stress / Q000187:drug effects; D008517:Phytotherapy; D051381:Rats; D017208:Rats, Wistar; D013482:Superoxide Dismutase / Q000097:blood; D013662:Tea
chemical_list: D000975:Antioxidants; D013662:Tea; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D005980:Glutathione Reductase