title: [Biosynthesis in the rat liver of a common form of monooxygenase induced by xenobiotics of a methylcholanthrene series].
abstract: Injection of Wistar rats with five structurally different inducers of methylcholanthrene-type (polycyclic aromatic and heterocyclic hydrocarbons, chloro-derivatives of biphenyl and dibenzo-p-dioxin) results in the de novo synthesis of two P-448 hemoproteins (molecular weight 56 000 and 53 000 Da) differing in their functional and immunochemical properties in liver microsomes. A comparison of catalytic and immunochemical characteristics of five cytochrome P-448 forms (Mr = 56 000 Da) as well as the data from electrophoretic, proteolytic and inhibitory analyses revealed no differences in the preparations used, with the exception of 2,3,7,8-tetrachloro-dibenzo-p-dioxin-induced microsomes characterized by a low level of this cytochrome P-448 form and a higher molecular activity as compared with 3,4-benzpyrene and 7-ethoxyresorufin-induced microsomes. The experimental results do not confirm the hypothesis on the feasibility of induced synthesis of a variety of individual forms of monooxygenase that would correlate with the number of structural variants of inducers.
mesh_terms: D000818:Animals; D001564:Benzo(a)pyrene / Q000378:metabolism; D019388:Cytochrome P-450 CYP1A2; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis*; D003580:Cytochromes / Q000096:biosynthesis*; D004591:Electrophoresis, Polyacrylamide Gel; D004790:Enzyme Induction / Q000187:drug effects; D006900:Hydroxylation; D005779:Immunodiffusion; D008297:Male; D008748:Methylcholanthrene / Q000494:pharmacology*; D008862:Microsomes, Liver / Q000201:enzymology*; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D003580:Cytochromes; D001564:Benzo(a)pyrene; D008748:Methylcholanthrene; D003577:Cytochrome P-450 Enzyme System; C017170:Cyp1a2 protein, rat; D019388:Cytochrome P-450 CYP1A2
vernacular_title: Biosintez v pecheni krys obshcheĭ formy monooksigenazy, indutsiruemoĭ ksenobiotikami metilkholantrenovogo riada.