Abstract
Cytochrome P450-dependent enzyme activities were measured in hepatocytes from adult male rats, induced in vivo with phenobarbitone, β-naphthoflavone, dexamethasone or isoniazid; the stability of the induced activities in culture was also determined. Each inducer produced a characteristically different pattern of enzyme activities with dexamethasone, isoniazid and β-naphthoflavone selectively inducing erythromycin N-demethylase, p-nitrophenol hydroxylase and ethoxyresorufin O-dealkylase respectively. In general, the induced activities were maintained for 24 hr in culture. This indicates the feasibility of an in vivo induction-hepatocyte culture system for the study of metabolism-mediated toxicity.
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