title: [Functional characteristics of cytochromes P-4501A1 and P-4501A2 in rodent liver].
abstract: Antibodies to mouse liver cytochrome P3-450 (anti-P3-450) and antibodies to rat liver cytochrome P-450d (anti-P-450d-c) inhibit the 0-deethylation of 7-ethoxyresorufin (ER) in liver microsomes of benz(a)pyrene-induced (BP) mice but do not inhibit the 0-deethylase activity in liver microsomes of BP-induced rats. Anti-P3-450 and anti-P-450c inhibit BP-hydroxylation in BP-induced mouse liver microsomes by 20%, but they do not inhibit this reaction at all in BP-induced rat liver microsomes. In a reconstituted monooxygenase system isolated cytochrome P3-450 metabolized 7-ER and BP. In contrast, its homologue, cytochrome P-450d, did not metabolize these substrates. The fraction containing cytochrome P1-450 metabolized 7-ER at a low rate and BP at a rate of 3.6 nmol product/min/nmol cytochrome. Western blot analysis with anti-P-450c + d revealed two bands in SDS-PAGE gels containing BP-induced mouse liver microsomes. The interaction of mouse liver BP-microsomes with anti-P3-450 and anti-P-450d-c was accompanied by the appearance of a single band (cytochrome P3-450).
authors.forename: T G
authors.initials: TG
authors.lastname: Duzhak
authors.forename: V M
authors.initials: VM
authors.lastname: Mishin
authors.forename: V V
authors.initials: VV
authors.lastname: Liakhovich
authors.forename: I B
authors.initials: IB
authors.lastname: Tsyrlov
mesh_terms: D000818:Animals; D001564:Benzo(a)pyrene / Q000633:toxicity; D015153:Blotting, Western; D002384:Catalysis; D019388:Cytochrome P-450 CYP1A2; D003577:Cytochrome P-450 Enzyme System / Q000302:isolation & purification / Q000378:metabolism*; D004591:Electrophoresis, Polyacrylamide Gel; D004790:Enzyme Induction; D008297:Male; D051379:Mice; D008862:Microsomes, Liver / Q000187:drug effects / Q000201:enzymology*; D010078:Oxazines / Q000378:metabolism; D010088:Oxidoreductases / Q000302:isolation & purification / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D010078:Oxazines; D001564:Benzo(a)pyrene; C007649:ethoxyresorufin; D003577:Cytochrome P-450 Enzyme System; D010088:Oxidoreductases; D019388:Cytochrome P-450 CYP1A2
vernacular_title: Funktsional'nye osobennosti tsitokhromov P-4501A1 i P-4501A2 v pecheni gryzunov.