Genetic polymorphisms of metabolic enzymes and the pharmacokinetics of indapamide in Taiwanese subjects.

Published

Journal Article

To understand the genetic makeup and impact on pharmacokinetics (PK) in the Taiwanese population, we analyzed the pharmacogenetic (PG) profile and demonstrated its effects on enzyme metabolism using indapamide as an example. A multiplex mass spectrometry method was used to examine the single nucleotide polymorphism (SNP) profile of eight major phases I and II metabolic enzymes in 1,038 Taiwanese subjects. A PG/PK study was conducted in 24 healthy subjects to investigate the possible effects of 28 SNPs on drug biotransformation. Among the genetic profile analyzed, eight SNPs from CYP2A6, CYP2C19, CYP2D6, CYP2E1, CYP3A5, and UGT2B7 showed higher variant frequencies than those previously reported in Caucasians or Africans. For instance, we observed 14.7% frequency of the SNP rs5031016 (I471T) from CYP2A6 in Taiwanese, whereas 0% variation was reported in Caucasians and Africans. The PG/PK study of indapamide demonstrated that the polymorphic SNPs CYP2C9 rs4918758 and CYP2C19 rs4244285 appeared to confer lowered enzyme activity, as indicated by increased C max (25% ∼ 64%), increased area under the plasma level-time curves (30~76%), increased area under the time infinity (43% ∼ 80%), and lower apparent clearance values than PK for wild-type indapamide. Our results reinforce the biochemical support of CYP2C19 in indapamide metabolism and identify a possible new participating enzyme CYP2C9. The PG/PK approach contributed toward understanding the genetic makeup of different ethnic groups and associations of enzymes in drug metabolism. It could be used to identify two genetic markers that enable to differentiate subjects with varied PK outcomes of indapamide.

Full Text

Duke Authors

Cited Authors

  • Wang, T-H; Hsiong, C-H; Ho, H-T; Shih, T-Y; Yen, S-J; Wang, H-H; Wu, J-Y; Kuo, BP-C; Chen, Y-T; Ho, S-T; Hu, OY-P

Published Date

  • March 2014

Published In

Volume / Issue

  • 16 / 2

Start / End Page

  • 206 - 213

PubMed ID

  • 24357089

Pubmed Central ID

  • 24357089

Electronic International Standard Serial Number (EISSN)

  • 1550-7416

Digital Object Identifier (DOI)

  • 10.1208/s12248-013-9535-x

Language

  • eng

Conference Location

  • United States