title: Potent suppressive effect of green tea polyphenols on tobacco-induced mutagenicity.
abstract: Antimutagenic activity of green tea (Camellia sinensis) was studied using Salmonella typhimurium strains (TA 102) (Ames test). Aqueous tobacco extract was found to be mutagenic to S. typhimurium TA 102 at concentration of 50 mg/plate. Green tea polyphenols was found to inhibit the mutagenicity of tobacco in a concentration-dependent manner. Concentrations needed for 50% inhibition of mutagen-induced revertant formation was found to be 5 mg/plate. Green tea polyphenols was also found to inhibit the urinary mutagenicity in rats induced by tobacco extract. Moreover green tea polyphenols were found to inhibit in vitro nitrosation reaction produced by reaction sodium nitrite and methyl urea and further inhibition of mutagenicity indicating that green tea has dual action to bring out a reduction in the mutagenic and carcinogenic potential of tobacco.
authors.affiliation: Amala Cancer Research Centre, Thrissur, Kerala 680553, India.
authors.forename: K T
authors.initials: KT
authors.lastname: Santhosh
authors.forename: J
authors.initials: J
authors.lastname: Swarnam
authors.forename: K
authors.initials: K
authors.lastname: Ramadasan
mesh_terms: D000818:Animals; D016587:Antimutagenic Agents / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D002273:Carcinogens / Q000633:toxicity; D004305:Dose-Response Relationship, Drug; D005419:Flavonoids / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use; D008297:Male; D009152:Mutagenicity Tests; D010636:Phenols / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use; D008517:Phytotherapy; D059808:Polyphenols; D051381:Rats; D017208:Rats, Wistar; D012486:Salmonella typhimurium / Q000187:drug effects / Q000235:genetics; D013662:Tea; D014026:Nicotiana / Q000633:toxicity
chemical_list: D016587:Antimutagenic Agents; D002273:Carcinogens; D005419:Flavonoids; D010636:Phenols; D059808:Polyphenols; D013662:Tea