title: [Effect of platinum derivatives on the inducible and repressible liver microsomal enzyme systems in the rat: inhibition of zoxazolamine-hydroxylase and induction of dimethyl-nitrosamine demethylase isoenzymes by cis-dichlorodiamine platinum (cis-PtCl2(NH3)2) and ammonium hexachloroplatinum (PtC16(NH4)2)].
abstract: Two platinum derivatives, cis-PtCl2(NH3)2 and PtCl6(NH4)2 have been studied for their effects on the Rat on cytochrome P450 in hepatic parenchyma on zoxazolamine-hydroxylase, a typical inducible system and on the two isoenzymes of dimethyl-nitrosamine demethylase, typical repressible systems. The inhibitory effect of PtCl6(NH4)2 on zoxazolamine-hydroxylase activity, previously shown by the authors, has been confirmed. The cis-PtCl2(NH3)2 also significantly inhibits zoxazolamine-hydroxylase activity. On the other hand, both of the platinum derivatives decrease cytochrome P450 level and enhance the dimethyl-nitrosamine metabolism. These various effects and their relationship are discussed.
mesh_terms: D000818:Animals; D002945:Cisplatin / Q000494:pharmacology*; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism; D004128:Dimethylnitrosamine / Q000378:metabolism; D004790:Enzyme Induction / Q000187:drug effects; D004794:Enzyme Repression / Q000187:drug effects; D007527:Isoenzymes / Q000096:biosynthesis; D008297:Male; D008862:Microsomes, Liver / Q000187:drug effects / Q000201:enzymology*; D006899:Mixed Function Oxygenases / Q000378:metabolism*; D010089:Oxidoreductases, N-Demethylating / Q000378:metabolism*; D051381:Rats; D015049:Zoxazolamine
chemical_list: D007527:Isoenzymes; D003577:Cytochrome P-450 Enzyme System; D015049:Zoxazolamine; D006899:Mixed Function Oxygenases; D010089:Oxidoreductases, N-Demethylating; D004128:Dimethylnitrosamine; D002945:Cisplatin
vernacular_title: Influence des dérivés du platine sur les systèmes enzymatiques microsomaux hépatiques inductibles et répressible chez le Rat : inhibition de la zoxazolaminehydroxylase et induction des isoenzymes de la diméthyl-nitrosamine déméthylase par le cis-dichlorodiammine platine (cis-PtCl2(NH3)2) et l'hexachloro platinate d'ammonium (PtCl6(NH4)2).