Title : Different enantioselective 9-hydroxylation of risperidone by the two human CYP2D6 and CYP3A4 enzymes.

Pub. Date : 2001 Oct

PMID : 11560868






4 Functional Relationships(s)
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1 The antipsychotic agent risperidone, is metabolized by different cytochrome P-450 (CYP) enzymes, including CYP2D6, to the active 9-hydroxyrisperidone, which is the major metabolite in plasma. Paliperidone Palmitate cytochrome P450 family 2 subfamily D member 6 Homo sapiens
2 Two enantiomers, (+)- and (-)-9-hydroxyrisperidone might be formed, and the aim of this study was to evaluate the importance of CYP2D6 and CYP3A4/CYP3A5 in the formation of these two enantiomers in human liver microsomes and in recombinantly expressed enzymes. Paliperidone Palmitate cytochrome P450 family 2 subfamily D member 6 Homo sapiens
3 The formation of (+)-9-hydroxyrisperidone was strongly inhibited by quinidine, a potent CYP2D6 inhibitor, whereas ketoconazole, a CYP3A4 inhibitor, strongly inhibited the formation of (-)-9-hydroxyrisperidone. Paliperidone Palmitate cytochrome P450 family 2 subfamily D member 6 Homo sapiens
4 Recombinant human CYP2D6 produced only (+)-9-hydroxyrisperidone, whereas a lower formation rate of both enantiomers was detected with expressed CYP3A4 and CYP3A5. Paliperidone Palmitate cytochrome P450 family 2 subfamily D member 6 Homo sapiens