Cytochrome P450 2C9-CYP2C9

Cytochrome P450 2C9 (CYP2C9) and vitamin K epoxide reductase (VKORC1) genotypes as determinants of acenocoumarol sensitivity.

The aim of the study is to explore the contribution of genetic factors related either to drug metabolism (cytochrome P450 2C9) or to drug target (vitamin K epoxide reductase) to variability in the response to acenocoumarol among 222 healthy volunteers after a single oral dose. Associations between a pharmacodynamic index (reduction in factor VII activity and international normalized ratio [INR]...

Effects of pomegranate juice on human cytochrome P450 2C9 (CYP2C9) and tolbutamide pharmacokinetics in rats

The impact of CYP2C9 genetics and oral contraceptives on cytochrome P450 2C9 phenotype.

CYP2C9-dependent drug metabolism is subject to large interindividual variation. To some extent, this is explained by genetic polymorphism with expression of enzyme variants that differ in catalytic activity. The aim of this study was to characterize the variation in CYP2C9 phenotype in relation to genotype, with further analysis of the CYP2C9 gene in metabolic outliers. A study population of 12...

Frequency of Cytochrome P450 2C9 (CYP2C9) Alleles in Three Ethnic Groups in Malaysia

Cytochrome P450 2C9 (CYP2C9) is the major enzyme involved in the metabolism of S-warfarin, an oral anticoagulant drug. Genetic polymorphisms of CYP2C9 gene have been reported and may play significant roles in pharmacogenomics. To date, over 5 CYP2C9 allelic variants have been reported. The most common allelic variants identified include CYP2C9*2 and CYP2C9*3. We conducted an investigation to de...

Substrate-dependent effect of acetonitrile on human liver microsomal cytochrome P450 2C9 (CYP2C9) activity.

Acetonitrile is an organic solvent commonly used to increase the solubility of lipophilic substrates for in vitro studies. In this study, we examined its effect on four reactions (diclofenac hydroxylation, tolbutamide methyl hydroxylation, phenytoin hydroxylation, and celecoxib methyl hydroxylation) catalyzed by human liver microsomes and by the recombinant CYP2C9. In both cases, the effect of ...