Abstract
Candesartan cilexetil is an angiotensin II receptor antagonist, and candesartan, its active metabolite, is metabolized by CYP2C9. However, the effect of CYP2C9*3 on candesartan metabolism is not established. We characterized the kinetics of candesartan by CYP2C9*1/*1 and CYP2C9*1/*3 in human liver microsomes. The difference between the two was not significant. Subsequently, CYP2C9*1 and CYP2C9*3 (Leu359) were expressed in yeast, and the kinetics of candesartan were determined. The wild-type showed the lower Km (345 vs 439 μM; 3/4) and higher Vmax/Km (1/3) than the Leu359 variant. Also, we investigated potential interaction between candesartan and warfarin with both the wild-type and the Leu359 variant. Candesartan had no effect on S-warfarin 7-hydroxylation. In contrast, S-warfarin inhibited candesartan metabolism by the wild-type (Ki = 17 μM) greater than by the Leu359 variant (Ki = 36 μM). These findings suggest that CYP2C9*3 may change not only the metabolic activity but also the inhibitory susceptibility compared with CYP2C9*1.
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Hanatani, T., Fukuda, T., Ikeda, M. et al. CYP2C9*3 influences the metabolism and the drug-interaction of candesartan in vitro. Pharmacogenomics J 1, 288–292 (2001). https://doi.org/10.1038/sj.tpj.6500063
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DOI: https://doi.org/10.1038/sj.tpj.6500063
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