The effect of terpenoid compounds on cytochrome P-450 levels in rat liver.
We have investigated the ability of camphor, menthol, pinene, limonene and myrcene to induce in rats members of a cytochrome P-450 sub-family termed PB P-450. These proteins have recently been designated as members of the P450IIB sub-family. None of these naturally occurring terpenoids significantly changed the total content of cytochromes P-450 or cytochrome b5. Radioimmunoassay results showed that PB P-450 was induced 6-fold by camphor and to a lesser extent by menthol and pinene. The induction was confirmed by Western blotting. It was shown by nucleic acid hybridization that induction of PB P-450 by terpenoids was mediated by an increase in the amount of the corresponding mRNA. Analysis of the denaturation of mRNA-cDNA hybrids demonstrated that the mRNA induced by the terpenoids was encoded by a member of the P450IIB sub-family. None of the terpenoids had an effect on the amount of mRNA coding for P450IA2 (a cytochrome P-450 inducible by beta-naphthoflavone and isosafrole). The results indicate that cytochromes P-450 induced by a synthetic compound, phenobarbital, may have originally evolved in response to terpenoid compounds normally present in the environment.
Austin
C A
CA
Department of Biochemistry, University College London, U.K.
Shephard
E A
EA
Pike
S F
SF
Rabin
B R
BR
Phillips
I R
IR
D000818:Animals; D002164:Camphor / Q000494:pharmacology; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis* / Q000235:genetics / Q000276:immunology; D004790:Enzyme Induction; D008610:Menthol / Q000494:pharmacology; D008862:Microsomes, Liver / Q000201:enzymology*; D009693:Nucleic Acid Hybridization; D010634:Phenobarbital / Q000494:pharmacology; D012333:RNA, Messenger / Q000032:analysis; D051381:Rats; D011919:Rats, Inbred Strains; D013729:Terpenes / Q000494:pharmacology*
D012333:RNA, Messenger; D013729:Terpenes; D008610:Menthol; D002164:Camphor; D003577:Cytochrome P-450 Enzyme System; D010634:Phenobarbital