Effects of CYP2C19 variants on the metabolism of tapentadol in vitro

Document Type : Original Article

Authors

1 The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China

2 The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China

3 School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China

4 The Key Laboratory of Geriatrics, Beijing Institute of Geriatrics, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Hospital/National Center of Gerontology of National Health Commission, Beijing, China

Abstract

Objective(s): This study aims to evaluate the catalytic activities of 31 CYP2C19 alleles and their effects on the metabolism of tapentadol in vitro. 
Materials and Methods: Insect microsomes expressing the CYP2C19 alleles were incubated with 50–1250 μM tapentadol for 40 min at 37 °C and terminated by cooling to -80 °C, immediately. Tapentadol and N-desmethyl tapentadol were analyzed by a UPLC-MS/MS system. The kinetic parameters Km, Vmax, and intrinsic clearance (Vmax/Km) of N-desmethyl tapentadol were determined. 
Results: As a result, the intrinsic clearance (Vmax/Km) values of most variants were significantly altered, while CYP2C19.3 and 35FS had no detectable enzyme activity. Only one variant, N277K, showed no significant difference from CYP2C19.1B. Two variants CYP2C19.29 and L16F displayed markedly increased intrinsic clearance values of 302.22% and 199.97%, respectively; whereas 24 variants exhibited significantly decreased relative clearance ranging from 0.32% to 79.15% of CYP2C19.1B. Especially, CYP2C19.2G, 2H, R124Q, and R261W exhibited a drastic decrease in clearance (>80%) compared with wild-type CYP2C19.1B. 
Conclusion: As the first study of all aforementioned alleles for tapentadol metabolism, the comprehensive data in vitro may provide novel insights into the allele-specific and substrate-specific activity of CYP2C19.

Keywords

References

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Iranian Journal of Basic Medical Sciences
Volume 25, Issue 5
May 2022
Pages 659-663

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