title: Cytochrome P-450 and monooxygenase activity in hepatic microsomes from N-phenylimidazole-treated rats.
abstract: Repeated administration of N-phenylimidazole (PI) to rats (3 daily doses of 200 mumol/kg/day) enhanced hepatic microsomal cytochrome P-450 levels (approx. 130%) and aminopyrine N-demethylase (APDM) and aniline p-hydroxylase (APH) activities (approx. 140%); aryl hydrocarbon (benzo[a]pyrene) hydroxylase (AHH) and 7-ethoxycoumarin O-deethylase (ECOD) activities were not enhanced over control values under similar conditions. Spectral studies with PI-induced microsomes indicated that although type II PI-binding characteristics were similar to those observed in controls, the 427 nm/455 nm absorbance ratio of the type III dihydrosafrole metabolite-cytochrome P-450 complex was lower than that in control microsomes. The results suggest that the inducing characteristics of PI bear some resemblance to those of phenobarbital (PB).
mesh_terms: D015660:7-Alkoxycoumarin O-Dealkylase; D000633:Aminopyrine N-Demethylase / Q000096:biosynthesis; D000815:Aniline Hydroxylase / Q000096:biosynthesis; D000818:Animals; D001571:Benzoflavones / Q000494:pharmacology; D001579:Benzopyrene Hydroxylase / Q000096:biosynthesis; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis*; D004790:Enzyme Induction / Q000187:drug effects; D007093:Imidazoles / Q000633:toxicity*; D008297:Male; D008862:Microsomes, Liver / Q000187:drug effects* / Q000201:enzymology; D006899:Mixed Function Oxygenases / Q000096:biosynthesis*; D010105:Oxygenases / Q000096:biosynthesis; D010634:Phenobarbital / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D013053:Spectrophotometry; D019324:beta-Naphthoflavone
chemical_list: D001571:Benzoflavones; D007093:Imidazoles; D019324:beta-Naphthoflavone; C037738:1-phenylimidazole; D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases; D010105:Oxygenases; D015660:7-Alkoxycoumarin O-Dealkylase; D000815:Aniline Hydroxylase; D001579:Benzopyrene Hydroxylase; D000633:Aminopyrine N-Demethylase; D010634:Phenobarbital