title: Influence of phenobarbital and 3-methylcholanthrene on the metabolism of aminopyrine in isolated hepatocyte system.
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.
mesh_terms: D000632:Aminopyrine / Q000031:analogs & derivatives / Q000378:metabolism*; D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004177:Dipyrone / Q000031:analogs & derivatives / Q000378:metabolism; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D066298:In Vitro Techniques; D008099:Liver / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D008748:Methylcholanthrene / Q000494:pharmacology*; D010634:Phenobarbital / Q000494:pharmacology*; D047069:Pyrazolones; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D047069:Pyrazolones; D000632:Aminopyrine; C011256:4-formylaminoantipyrine; D008748:Methylcholanthrene; D004177:Dipyrone; C008667:noramidopyrine; D010634:Phenobarbital