title: Inhibition of the metabolism of mutagens occurring in food by arachidonic acid.
abstract: Hepatic microsomal fractions (microsomes) were prepared from male Sprague-Dawley rats. The effect of arachidonic acid on the conversion of the heterocyclic aromatic amine 2-amino-3-methylimidazo[4,5-f]quinoline (IQ) to its genotoxic metabolites was investigated using a modified bacterial mutation assay (indicator: Salmonella typhimurium TA98). Arachidonic acid inhibited the mutagenicity of IQ without effect on the uptake of the active metabolites and/or on the DNA-repair processes within the bacterial cell. The activation of 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline (MeIQx), 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) and aflatoxin B1 (AFB1) was also inhibited by this polyunsaturated fatty acid.
authors.affiliation: BIBRA, Carshalton, Surrey, UK.
authors.forename: T A
authors.initials: TA
authors.lastname: Ho
authors.forename: T M
authors.initials: TM
authors.lastname: Coutts
authors.forename: I R
authors.initials: IR
authors.lastname: Rowland
authors.forename: A J
authors.initials: AJ
authors.lastname: Alldrick
mesh_terms: D016604:Aflatoxin B1 / Q000378:metabolism / Q000494:pharmacology; D000818:Animals; D016587:Antimutagenic Agents / Q000494:pharmacology*; D016718:Arachidonic Acid / Q000494:pharmacology*; D001711:Biotransformation; D004260:DNA Repair; D005502:Food; D007093:Imidazoles / Q000378:metabolism / Q000494:pharmacology; D008297:Male; D008862:Microsomes, Liver / Q000187:drug effects / Q000378:metabolism*; D009152:Mutagenicity Tests; D009153:Mutagens / Q000378:metabolism* / Q000494:pharmacology; D011804:Quinolines / Q000378:metabolism / Q000494:pharmacology; D011810:Quinoxalines / Q000378:metabolism / Q000494:pharmacology; D051381:Rats; D017207:Rats, Sprague-Dawley; D012486:Salmonella typhimurium / Q000187:drug effects
chemical_list: D016587:Antimutagenic Agents; D007093:Imidazoles; D009153:Mutagens; D011804:Quinolines; D011810:Quinoxalines; D016718:Arachidonic Acid; C029216:2-amino-3-methylimidazo(4,5-f)quinoline; C036990:2-amino-3,8-dimethylimidazo(4,5-f)quinoxaline; C049584:2-amino-1-methyl-6-phenylimidazo(4,5-b)pyridine; D016604:Aflatoxin B1