title: Musk xylene is a novel specific inducer of cytochrome P-450IA2.
abstract: The effect of musk xylene on contents of both cytochrome P-450IA1 and cytochrome P-450IA2 in rat liver was investigated using Western blotting analysis. Rats were treated i.p. for five consecutive days with either 50, 100 or 200 mg musk xylene/kg body weight. Musk xylene increased both total cytochrome P-450 and cytochrome b5 contents in rat liver microsomes. Musk xylene induced cytochrome P-450IA2 (384 pmol/mg protein) strongly and preferentially and the ratio of cytochrome P450IA2/P-450IA1 was about 12 at the lowest dose tested. Musk xylene also induced the cytochrome P-450IA1 dose-dependently, but these extents were very small (32-174 pmol/mg protein). These results suggest that musk xylene may be a more specific inducer for cytochrome P-450IA2 than any other inducers reported.
authors.affiliation: Division of Xenobiotic Metabolism and Disposition, National Institute of Hygienic Sciences, Tokyo, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Iwata
authors.forename: K
authors.initials: K
authors.lastname: Minegishi
authors.forename: K
authors.initials: K
authors.lastname: Suzuki
authors.forename: Y
authors.initials: Y
authors.lastname: Ohno
authors.forename: T
authors.initials: T
authors.lastname: Kawanishi
authors.forename: A
authors.initials: A
authors.lastname: Takahashi
mesh_terms: D000818:Animals; D015153:Blotting, Western; D019388:Cytochrome P-450 CYP1A2; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis*; D015786:Cytochromes b5 / Q000096:biosynthesis; D004305:Dose-Response Relationship, Drug; D004790:Enzyme Induction; D007700:Kinetics; D008297:Male; D008862:Microsomes, Liver / Q000187:drug effects / Q000378:metabolism*; D010088:Oxidoreductases / Q000096:biosynthesis*; D010476:Perfume; D051381:Rats; D011919:Rats, Inbred Strains; D012016:Reference Values; D014992:Xylenes / Q000494:pharmacology*
chemical_list: D010476:Perfume; D014992:Xylenes; C031447:musk xylene; D015786:Cytochromes b5; D003577:Cytochrome P-450 Enzyme System; D010088:Oxidoreductases; D019388:Cytochrome P-450 CYP1A2