Carboxylesterase 1 polymorphism impairs oseltamivir bioactivation in humans

Clinical Pharmacology and Therapeutics
E K TarkiainenM Niemi

Abstract

Bioactivation of the antiviral agent oseltamivir to active oseltamivir carboxylate is catalyzed by carboxylesterase 1 (CES1). After the screening of 860 healthy Finnish volunteers for the CES1 c.428G>A (p.Gly143Glu, rs121912777) polymorphism, a pharmacokinetic study with 75 mg oseltamivir was carried out in c.428G>A carriers and noncarriers. Heterozygous c.428GA carriers (n = 9) had 18% larger values of oseltamivir area under the plasma concentration-time curve from 0 h to infinity (AUC(0-∞)) (P = 0.025) and 23% smaller carboxylate-to-oseltamivir AUC(0-∞) ratio (P = 0.006) than noncarriers (n = 12). This shows that the CES1 c.428G>A polymorphism impairs oseltamivir bioactivation in humans.

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Citations

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