title: Relationship between induction of aryl hydrocarbon hydroxylase and de novo synthesis of cytochrome P-448 (P1-450) in mice.
abstract: Phenobarbital, 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane (DDT), benzpyrene, 3-methylcholanthrene (3-MC) or 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) were administered i.p. for 1 or 3 days to genetically "responsive" (C57BL/6J) and genetically "non-responsive" (DBA/2J) mice. 3-MC or benzpyrene stimulated aryl hydrocarbon hydroxylase (AHH) activity in C57BL/6J (B6) mice but not in DBA/2J (D2) mice. TCDD induced AHH activity in both B6 and D2 mice. Time-course studies showed that in the first 12 h after a single injection of 3-MC to B6 mice there was no shift in the reduced cytochrome P-450-CO complex absorption spectra from 450 to 448 nm, although AHH activity increased 4-5 times over (above) that of the control group. The relationship between induction of AHH activity by polycyclic hydrocarbons in B6 mice and the concomitant synthesis of cytochrome P-448 is discussed.
mesh_terms: D000818:Animals; D001189:Aryl Hydrocarbon Hydroxylases / Q000378:metabolism*; D001580:Benzopyrenes / Q000494:pharmacology; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis*; D003634:DDT / Q000494:pharmacology; D004790:Enzyme Induction / Q000187:drug effects; D007700:Kinetics; D008297:Male; D008748:Methylcholanthrene / Q000494:pharmacology; D051379:Mice; D008815:Mice, Inbred Strains; D008862:Microsomes, Liver / Q000187:drug effects / Q000201:enzymology*; D010634:Phenobarbital / Q000494:pharmacology; D000072317:Polychlorinated Dibenzodioxins / Q000494:pharmacology; D013045:Species Specificity
chemical_list: D001580:Benzopyrenes; D000072317:Polychlorinated Dibenzodioxins; D008748:Methylcholanthrene; D003577:Cytochrome P-450 Enzyme System; D003634:DDT; D001189:Aryl Hydrocarbon Hydroxylases; D010634:Phenobarbital