title: Effect in vitro of arachidonic acid, eicosapentaenoic acid and docosahexaenoic acid on the hepatic activation of dietary genotoxins by rat post-mitochondrial fractions.
abstract: The effect of arachidonic acid, eicosapentaenoic acid and docosahexaenoic acid on the conversion of the heterocyclic amine 2-amino-3-methylimidazo[4,5-f]quinoline (IQ) to its genotoxic metabolites was investigated using a modified bacterial mutation assay. The assay used Salmonella typhimurium TA98 as an indicator of the mutagenicity and hepatic post-mitochondrial fractions (S-9) from male Sprague-Dawley rats as the activating system. All three fatty acids 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 three other food mutagens, 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 these fatty acids.
authors.affiliation: Department of Microbiology, BIBRA Toxicology International, Carshalton, Surrey, UK.
authors.forename: T A
authors.initials: TA
authors.lastname: Hô
authors.forename: A J
authors.initials: AJ
authors.lastname: Alldrick
authors.forename: I R
authors.initials: IR
authors.lastname: Rowland
mesh_terms: D000818:Animals; D016718:Arachidonic Acid / Q000494:pharmacology*; D001711:Biotransformation; D004260:DNA Repair / Q000187:drug effects; D004281:Docosahexaenoic Acids / Q000494:pharmacology*; D015118:Eicosapentaenoic Acid / Q000494:pharmacology*; D005506:Food Contamination; D066298:In Vitro Techniques; D008297:Male; D008862:Microsomes, Liver / Q000378:metabolism*; D009152:Mutagenicity Tests; D009153:Mutagens / Q000493:pharmacokinetics*; D011804:Quinolines / Q000493:pharmacokinetics; D051381:Rats; D017207:Rats, Sprague-Dawley; D012486:Salmonella typhimurium / Q000187:drug effects / Q000235:genetics
chemical_list: D009153:Mutagens; D011804:Quinolines; D004281:Docosahexaenoic Acids; D016718:Arachidonic Acid; C029216:2-amino-3-methylimidazo(4,5-f)quinoline; D015118:Eicosapentaenoic Acid