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Effect of CYP2C19 polymorphisms on serum valproic level acid in Chinese Han patients with schizophrenia
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Effect of CYP2C19 polymorphisms on serum valproic level acid in Chinese Han patients with schizophrenia
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Journal Article
Effect of CYP2C19 polymorphisms on serum valproic level acid in Chinese Han patients with schizophrenia
2021
Overview
Valproic acid is an anticonvulsant, which is also widely used for treating psychiatric disorders. Some clinical trials have demonstrated benefits of valproic acid augmentation therapy in schizophrenia. Interindividual variability in valproic acid dose and serum concentration may reflect functional consequences of genetic polymorphisms in genes encoding drug-metabolizing enzymes. The aim of this study was to determine the relationship between serum concentrations of valproic acid and single nucleotide polymorphisms of the
cytochrome P450 (CYP) 2C19
gene in patients with schizophrenia. All patients had been receiving fixed dose of valproic acid for at least 2 weeks. The daily doses were 0.5–1.5 g. No other drugs except olanzapine were coadministered. Serum concentrations of valproic acid were measured using the ultra-high performance liquid chromatography method with mass-spectrometric detection. The
CYP2C19
(
CYP2C19*2 G681A
rs4244285 and
CYP2C19*3 G636A
rs4986893) genotypes were identified by real-time PCR analyses. The mean concentration/dose ratios of valproic acid were significantly higher in patients with
CYP2C19 *1/*2
genotype (
P
< 0.01) or
CYP2C19 *2/*3
genotype (
P
< 0.01) than in those with
CYP2C12 *1/*1
genotype. The mean concentration/dose ratios of valproic acid were significantly higher in patients with 1 (
P
< 0.01) or 2 (
P
< 0.01) mutated alleles for
CYP2C19
than in those without mutated alleles. And the post hoc analysis revealed that the result has acceptable statistical (power (1 – β) = 0.8486 at type I level of 0.05) to support the observed significant associations for
CYP2C19
SNPs and serum C/D ratios of valproic acid. The findings of this study suggest that the genetic polymorphisms of CYP2C19 significantly affect the steady-state serum concentrations of valproic acid in Chinese Han population. The determination of the CYP2C19 genotypes may be useful for dosing adjustment in schizophrenia patients on valproic acid therapy.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ Acids
/ Adult
/ Alleles
/ Asians
/ China
/ Chromatography, High Pressure Liquid
/ Cytochrome P-450 CYP2C19 - genetics
/ Dosage
/ Female
/ Genotype
/ High-performance liquid chromatography
/ Humanities and Social Sciences
/ Humans
/ Male
/ Olanzapine - administration & dosage
/ Patients
/ Polymorphism, Single Nucleotide
/ Real-Time Polymerase Chain Reaction
/ Schizophrenia - drug therapy
/ Science
