title: Aflatoxin B1-4-hydroxylase is associated with cytochrome P3-450 in C57BL/6 mouse liver.
abstract: Messenger RNA from the livers of Aroclor 1254 treated mice was used to produce a cDNA library. cDNA clones corresponding to cytochromes P1-450 and P3-450 were isolated from this library by screening with a probe for the rat cytochrome P-450c gene. Specific non-cross hybridizing probes for P1-450 and P3-450 were prepared from unique restriction fragments. The radiolabeled probes were hybridized to RNA from mice treated with a low (15 mg/kg) and high (150 mg/kg, 400 mg/kg) doses of beta-naphthoflavone. The low dose of beta-naphthoflavone was found to induce only P3-450 mRNA, whereas higher doses induced both P1-450 and P3-450 mRNA. Similarly, a low dose of beta-naphthoflavone induced aflatoxin B1-4-hydroxylase, whereas higher doses induced both aflatoxin B1-4-hydroxylase and aryl hydrocarbon hydroxylase activities. These results suggest that P3-450 mRNA codes for the cytochrome that is associated with aflatoxin B1-4-hydroxylase activity.
mesh_terms: D000818:Animals; D001140:Aroclors / Q000494:pharmacology*; D001189:Aryl Hydrocarbon Hydroxylases / Q000235:genetics; D001571:Benzoflavones / Q000494:pharmacology; D020111:Chlorodiphenyl (54% Chlorine); D003577:Cytochrome P-450 Enzyme System / Q000235:genetics*; D004247:DNA / Q000235:genetics; D004790:Enzyme Induction / Q000187:drug effects; D005260:Female; D008099:Liver / Q000187:drug effects / Q000378:metabolism*; D008748:Methylcholanthrene / Q000494:pharmacology; D051379:Mice; D008810:Mice, Inbred C57BL; D006899:Mixed Function Oxygenases / Q000235:genetics*; D009693:Nucleic Acid Hybridization; D011078:Polychlorinated Biphenyls / Q000494:pharmacology*; D012333:RNA, Messenger / Q000096:biosynthesis; D019324:beta-Naphthoflavone
chemical_list: D001140:Aroclors; D001571:Benzoflavones; D012333:RNA, Messenger; D020111:Chlorodiphenyl (54% Chlorine); D008748:Methylcholanthrene; D019324:beta-Naphthoflavone; D004247:DNA; D003577:Cytochrome P-450 Enzyme System; D011078:Polychlorinated Biphenyls; D006899:Mixed Function Oxygenases; C019623:aflatoxin B1 hydroxylase; D001189:Aryl Hydrocarbon Hydroxylases