title: In vitro effects of L-ascorbic acid (vitamin C) on aryl hydrocarbon hydroxylase activity in hepatic microsomes of mice.
abstract: When aromatic hydrocarbon (Ah)-responsive and -non-responsive strains of mice were pretreated with 3-methylcholanthrene (MC) or 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), vitamin C reduced the microsomal aryl hydrocarbon hydroxylase (AHH) activity. The AHH inhibitors 7,8-benzoflavone (7,8-BF) and 3-methylsulfonyl-3',4,4',5-tetrachlorobiphenyl (3-MSF-3',4,4',5-tetraCB) showed various inhibitory effects depending upon the types of microsomes, whereas vitamin C exhibited inhibition irrespective of the types of microsomes. 7,8-BF and 3-MSF-3',4,4',5-tetraCB as well as vitamin C suppressed the reverse mutation of the Salmonella typhimurium tester strains TA98 and TA100 induced by benzo[a]pyrene.
authors.affiliation: Department of Public Health, Faculty of Medicine, Kyushu University, Fukuoka, Japan.
authors.forename: C
authors.initials: C
authors.lastname: Kiyohara
authors.forename: M
authors.initials: M
authors.lastname: Omura
authors.forename: T
authors.initials: T
authors.lastname: Hirohata
mesh_terms: D000818:Animals; D001189:Aryl Hydrocarbon Hydroxylases / Q000187:drug effects / Q000378:metabolism*; D001205:Ascorbic Acid / Q000494:pharmacology*; D004789:Enzyme Activation; D006801:Humans; D008748:Methylcholanthrene / Q000494:pharmacology; D051379:Mice; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D008862:Microsomes, Liver / Q000187:drug effects / Q000201:enzymology*; D009152:Mutagenicity Tests; D009153:Mutagens / Q000494:pharmacology; D000072317:Polychlorinated Dibenzodioxins / Q000494:pharmacology; D014407:Tumor Cells, Cultured
chemical_list: D009153:Mutagens; D000072317:Polychlorinated Dibenzodioxins; D008748:Methylcholanthrene; D001189:Aryl Hydrocarbon Hydroxylases; D001205:Ascorbic Acid