Abstract
The effect of phenobarbital (PB) and 3-methylcholanthrene (3-MC) on the metabolic behavior of aminopyrine (AM) was studied using an isolated hepatocyte system prepared from male Wistar rats. The formation of 4-formylaminoantipyrine (FAA) was increased after pretreatment with PB, but not 3-MC. However, the total amounts of AM and its main metabolites recovered from hepatocyte system after the incubation for 30 min were considerably reduced both by PB and 3-MC-pretreatment. Furthermore, when using 4-monomethylaminoantipyrine (MAA), the first metabolite of AM, as a substrate, 3-MC-pretreatment resulted in a more significant decrease in the total amounts of MAA and its further metabolites recovered than did PB. Present observation suggests the participation of cytochrome P-448 as well as cytochrome P-450 in the metabolism of AM.
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