title: Comparative efficacy as antioxidants between ascorbic acid and epigallocatechin gallate on cells of two human lymphoblastoid lines.
abstract: Both ascorbic acid and epigallocatechin gallate, which is one of the key polyphenols contained in green tea leaves, have been considered excellent antioxidants. The present study compared the efficacy as antioxidants between the two agents on an equimolar basis. Cells of two lymphoid lines were used as test material to determine the reduction of chromosome damage induced by the radiomimetic antibiotic bleomycin. Without bleomycin, both agents, at concentrations of 10(-7), 10(-6), 10(-5), and 10(-4) M, showed chromosome damage similar to the untreated controls. With bleomycin, the weakest concentration of both showed no protective effect. At concentrations of 10(-6) and 10(-5) M, especially the latter, a significant reduction in frequencies of chromatid breaks was recorded. However, at the highest concentration, 10(-4) M, the chromatid break frequencies rose to the same level as that of cells treated with bleomycin alone, suggesting that both behaved like pro-oxidants.
authors.affiliation: Department of Cancer Biology, University of Texas M.D. Anderson Cancer Center, Houston, TX 77030, USA.
authors.forename: T C
authors.initials: TC
authors.lastname: Hsu
authors.forename: Y J
authors.initials: YJ
authors.lastname: Zhao
authors.forename: R Y
authors.initials: RY
authors.lastname: Wang
authors.forename: Y F
authors.initials: YF
authors.lastname: Wu
authors.forename: M R
authors.initials: MR
authors.lastname: Spitz
authors.forename: W K
authors.initials: WK
authors.lastname: Hong
mesh_terms: D000975:Antioxidants / Q000494:pharmacology*; D001205:Ascorbic Acid / Q000494:pharmacology*; D001761:Bleomycin / Q000494:pharmacology; D002392:Catechin / Q000031:analogs & derivatives* / Q000494:pharmacology*; D002460:Cell Line; D004305:Dose-Response Relationship, Drug; D004353:Drug Evaluation, Preclinical; D006801:Humans; D008214:Lymphocytes / Q000187:drug effects / Q000473:pathology; D009153:Mutagens / Q000494:pharmacology
chemical_list: D000975:Antioxidants; D009153:Mutagens; D001761:Bleomycin; D002392:Catechin; C045651:epigallocatechin gallate; D001205:Ascorbic Acid