Ji-Hong Kim

Sungkyunkwan University, Sŏul, Seoul, South Korea

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Publications (2)5.92 Total impact

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    ABSTRACT: The genetically polymorphic CYP2C9 metabolizes many non-steroidal anti-inflammatory agents, including naproxen. This study examined the effects of a CYP2C9 genetic polymorphism on the pharmacokinetics of naproxen in Korean subjects. Twenty healthy male subjects carrying a CYP2C9*1/*1 (n=14) or CYP2C9*1/*3 (n=6) polymorphism were enrolled. After a single-dose of 275 mg naproxen Na, blood samples were collected at various times over a 72 h period and the plasma naproxen concentration was measured. The plasma concentration of naproxen was determined by HPLC analysis with UV detection, and the pharmacokinetic parameters were calculated. The mean plasma concentration-time profiles of naproxen in the CYP2C9*1/*3 and CYP2C9*1/*1 individuals were similar. There were no significant differences in the pharmacokinetics of naproxen between CYP2C9*1/*1 and CYP2C9*1/*3 genotypes. The AUC(0-infinity) (p = 0.759) and oral clearance (p = 0.823) of naproxen were also similar in individuals with CYP2C9*1/*3 and CYP2C9*1/*1. Overall, a genetic polymorphism of CYP2C9 does not significantly affect the pharmacokinetics of naproxen. Therefore, naproxen does not require a dose adjustment for individuals with the CYP2C9*1/*3 genotype.
    No preview · Article · Mar 2009 · Archives of Pharmacal Research
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    ABSTRACT: To determine the frequencies of the variant alleles and the genotypes of CYP2C9 in a Korean population. Three hundred and fifty-eight healthy Korean subjects were studied. CYP2C9 alleles were detected by polymerase chain reaction-restriction fragment length polymorphism assays and direct sequencing assays. The allele frequencies were 0.934 for CYP2C9*1, 0.060 for CYP2C9*3 and 0.006 for CYP2C9*13. The CYP2C9*2,*4,*5 and *11 alleles were not detected. The frequencies of the CYP2C9*1/*1, *1/*3 and *1/*13 genotypes were 0.869, 0.120 and 0.011, respectively. The frequency of the CYP2C9*3 allele in the Korean population studied was significantly higher than reported elsewhere, and a novel allele, CYP2C9*13, was found at a frequency of 0.006 (95% confidence interval 0, 0.012). Only three genotypes of CYP2C9, CYP2C9*1/*1,*1/*3 and *1/*13 were observed in this Korean population.
    Preview · Article · Nov 2005 · British Journal of Clinical Pharmacology