Title : Differentiated induction of cytochrome P450b/e and P450p mRNAs by dose of phenobarbital in primary cultures of adult rat hepatocytes.

Pub. Date : 1990 Oct

PMID : 2233686






5 Functional Relationships(s)
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1 Phenobarbital induces cytochromes P450 (P450s) of not only the class IIB gene subfamily (i.e., P450b and P450e) but also the class IIIA gene subfamily (P450p and P450pcn2). Phenobarbital cytochrome P450, family 3, subfamily a, polypeptide 2 Rattus norvegicus
2 Phenobarbital also produced a weak dose-dependent induction of P450pcn2 mRNA, with a potency (ED50 = 3.4 x 10(-5) M) intermediate between those for P450b/e and P450p. Phenobarbital cytochrome P450, family 3, subfamily a, polypeptide 2 Rattus norvegicus
3 In a similar experiment using two phenobarbital-like inducers, (trans)nonachlor and clotrimazole, the relative inductions of P450b, P450e, P450p, and P450pcn2 mRNAs proved to be similar to those produced by phenobarbital (P450p/P450b potency ratios = 14- and 16-fold, respectively). Phenobarbital cytochrome P450, family 3, subfamily a, polypeptide 2 Rattus norvegicus
4 In a similar experiment using two phenobarbital-like inducers, (trans)nonachlor and clotrimazole, the relative inductions of P450b, P450e, P450p, and P450pcn2 mRNAs proved to be similar to those produced by phenobarbital (P450p/P450b potency ratios = 14- and 16-fold, respectively). Clotrimazole cytochrome P450, family 3, subfamily a, polypeptide 2 Rattus norvegicus
5 In a similar experiment using two phenobarbital-like inducers, (trans)nonachlor and clotrimazole, the relative inductions of P450b, P450e, P450p, and P450pcn2 mRNAs proved to be similar to those produced by phenobarbital (P450p/P450b potency ratios = 14- and 16-fold, respectively). Phenobarbital cytochrome P450, family 3, subfamily a, polypeptide 2 Rattus norvegicus