Effects of CYP2C19 variants on methadone metabolism in vitro.

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Lan T, Yuan LJ, Hu XX, Zhou Q, Wang J, Huang XX, Dai DP, Cai JP, Hu GX

Effects of CYP2C19 variants on methadone metabolism in vitro.

Drug Test Anal. 2017 Apr;9(4):634-639. doi: 10.1002/dta.1997. Epub 2016 May 19.

PubMed ID

27199033 [ View in PubMed

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Abstract

CYP2C19 is an important member of the cytochrome P450 (CYP450) enzyme super family and is responsible for clearing approximately 10% of commonly used clinical drugs that undergo phase I metabolism. Genetic polymorphisms of CYP2C19 significantly influence the efficacy and safety of some drugs, which might cause undesirable adverse effects or cure failure at standard dosages. The aim of this study was to clarify the catalytic activities of 31 CYP2C19 alleles on the oxidative in vitro metabolism of methadone. Insect microsomes expressing the CYP2C19 alleles were incubated with 50-2000 muM methadone for 30 min at 37 degrees C and terminated by cooling to -80 degrees C immediately. Methadone and its metabolite EDDP were analyzed by an ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) system. Of the 31 tested CYP2C19 allelies variants, CYP2C19*1 is the wild-type. Compared with CYP2C19*1, two CYP2C19 variants (CYP2C19*3 and *35FS) had no detectable enzyme activity, one variant L16F exhibited slightly increased intrinsic clearance values, and one variant N277K showed no significant difference. In addition, 26 variants exhibited significantly decreased values (from 1.48% to 80.40%). These findings suggest that more attention should be paid in clinical administration of methadone to individuals carrying these CYP2C19 alleles. Copyright (c) 2016 John Wiley & Sons, Ltd.

DrugBank Data that Cites this Article

Drug Enzymes

Drug	Enzyme	Kind	Organism	Pharmacological Action	Actions
Methadone	Cytochrome P450 2C19	Protein	Humans	Unknown	Substrate	Details