title: Induction of a high spin form of microsomal cytochrome P-448 in rat liver by 4-aminoazobenzene derivatives.
abstract: Male Sprague-Dawley rats were treated with 4-aminoazobenzene derivatives or other drug metabolizing enzyme inducers such as phenobarbital, 3-methylcholanthrene and isosafrole. The expression of hepatic microsomal cytochrome P-450 of the rats, principally that of a high spin form of cytochrome P-448 (cytochrome P-448H), was assessed by a bacterial mutation test and by immunological methods. The results of the mutation test with use of Salmonella typhimurium TA9 and 3 aromatic amine substrates showed that 2-methoxyl, 3-methoxyl and 2',3-dimethoxyl derivatives of AAB and methyl derivatives of AAB such as o-aminoazotoluene, N-methyl-4-aminoazobenzene and N,N-dimethyl-4-aminoazobenzene have a large capacity for the selective induction of cytochrome P-448H. Activity of the cytochrome increased by 6 hr after an azo dye treatment, reached a maximum after 24 hr, and then declined. In contrast, 4'-methoxy-AAB has a small, and AAB has no, capacity for the cytochrome induction. The aminoazo dye-induced enzymes differ in their substrate specificities from those induced with 3-methylcholanthrene or phenobarbital, and the induced enzyme was identified to be cytochrome P-448H, as determined by an enzyme-linked immunosorbent assay and immunoblotting with use of anti-cytochrome P-448 monoclonal antibodies. These observations indicate that several methoxyl and methyl derivatives of 4-aminoazobenzene are potent and selective inducers of cytochrome P-448H in the rat.
mesh_terms: D000818:Animals; D001391:Azo Compounds / Q000494:pharmacology*; D001571:Benzoflavones / Q000494:pharmacology; D019388:Cytochrome P-450 CYP1A2; D003580:Cytochromes / Q000096:biosynthesis*; D004305:Dose-Response Relationship, Drug; D008297:Male; D008748:Methylcholanthrene / Q000494:pharmacology; D008862:Microsomes, Liver / Q000187:drug effects / Q000201:enzymology*; D010634:Phenobarbital / Q000494:pharmacology; D000072317:Polychlorinated Dibenzodioxins / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D012451:Safrole / Q000494:pharmacology; D019324:beta-Naphthoflavone; D010128:p-Aminoazobenzene / Q000031:analogs & derivatives / Q000494:pharmacology*
chemical_list: D001391:Azo Compounds; D001571:Benzoflavones; D003580:Cytochromes; D000072317:Polychlorinated Dibenzodioxins; D008748:Methylcholanthrene; D010128:p-Aminoazobenzene; D019324:beta-Naphthoflavone; C017170:Cyp1a2 protein, rat; D019388:Cytochrome P-450 CYP1A2; D012451:Safrole; C015959:isosafrole; D010634:Phenobarbital