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Current Drug Metabolism


ISSN (Print): 1389-2002
ISSN (Online): 1875-5453

Research Article

Influence of the OATP Polymorphism on the Population Pharmacokinetics of Methotrexate in Chinese Patients

Author(s): Zhiqi Wang, Nan Zhang, Chaoyang Chen, Shuqing Chen, Junyu Xu, Ying Zhou, Xia Zhao* and Yimin Cui*

Volume 20, Issue 7, 2019

Page: [592 - 600] Pages: 9

DOI: 10.2174/1389200220666190701094756

open access plus


Background: The Pharmacokinetics of Methotrexate (MTX) has been reported to show significant intersubject variability. MTX is metabolized by SHMT1 and transported by OATP1B1 and OATP1B3 both of which show genetic polymorphisms. The non-genetic and genetic factors may influence the pharmacokinetics of MTX.

Objective: This study aimed to determine the pharmacokinetic parameters of MTX in Chinese patients and to investigate the effect of various non-genetic factors and genetic variants of OATP1B1, OATP1B3 on MTX’s pharmacokinetics.

Methods: MTX concentration and clinical characteristics data were collected from 71 rheumatoid arthritis patients. For each patient, SLC19A1, SHMT1, OATP1B1, and OATP1B3 genotyping were tested. Population pharmacokinetic analysis was performed by Nonlinear Mixed-Effect Modeling (NONMEM). MTX pharmacokinetic properties analysis was executed using the one-compartment pharmacokinetic model which incorporated first-order conditional estimation methods with interaction. Besides, the impact of genetic factors and demographic factors on MTX disposition were explored.

Results: All the genotypes of steady-state plasma concentrations and OATP1B1 rs4149056, OATP1B1 rs2306283, and OATP1B3 rs7311358 were determined. The detected blood drug concentration reached the standard. Genotypes were all measured. At the same time, the population pharmacokinetic model of methotrexate was obtained CL(L·h-1) =8.25× e0.167× SNP (SNP: SLCO1B1 388A/A=3; SLCO1B1 388A/G=2; SLCO1B1 388G/G=1); V(L)= 32.8; Ka(h- 1)=1.69.

Conclusion: In our study, it was showed that OATP1B1-388 G>A SNP had a significant effect on CL/F. The factor should be considered when determining MTX dosing. However, prospective studies with a large number of participants are needed to validate the results of this study.

Keywords: Rheumatoid arthritis, methotrexate, organic anion-transporting polypeptides (OATPs), nonlinear mixed-effect modeling (NONMEM), pharmacogenetics, population pharmacokinetics.

Graphical Abstract
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