Abstract
Background and Objectives
In the proximal tubule, basic drugs are transported from the renal cells to the tubule lumen through the concerted action of the H+/organic cation antiporters, multidrug and toxin extrusion (MATE) 1 and MATE2K. Dual inhibitors of the MATE transporters have been shown to have a clinically relevant effect on the pharmacokinetics of concomitantly administered basic drugs. However, the clinical impact of selective renal organic cation transport inhibition on the pharmacokinetics and pharmacodynamics of basic drugs, such as metformin, is unknown. This study sought to identify a selective MATE2K inhibitor in vitro and to determine its clinical impact on the pharmacokinetics and pharmacodynamics of metformin in healthy subjects.
Methods
Strategic cell-based screening of 71 US Food and Drug Administration (FDA)-approved medications was conducted to identify selective inhibitors of renal organic cation transporters that are capable of inhibiting at clinically relevant concentrations. From this screen, nizatidine was identified and predicted to be a clinically potent and selective inhibitor of MATE2K-mediated transport. The effect of nizatidine on the pharmacokinetics and pharmacodynamics of metformin was evaluated in 12 healthy volunteers in an open-label, randomized, two-phase crossover drug–drug interaction (DDI) study.
Results
In healthy volunteers, the MATE2K-selective inhibitor nizatidine significantly increased the apparent volume of distribution, half-life, and hypoglycemic activity of metformin. However, despite achieving unbound maximum concentrations greater than the in vitro inhibition potency (concentration of drug producing 50 % inhibition [IC50]) of MATE2K-mediated transport, nizatidine did not affect the renal clearance (CLR) or net secretory clearance of metformin.
Conclusion
This study demonstrates that a selective inhibition of MATE2K by nizatidine affected the apparent volume of distribution, tissue concentrations, and peripheral effects of metformin. However, nizatidine did not alter systemic concentrations or the CLR of metformin, suggesting that specific MATE2K inhibition may not be sufficient to cause renal DDIs with metformin.
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Acknowledgments
We thank Jennifer Hibma for assistance in preparing the clinical study protocol. We thank Hector Vizoso and all the staff at the General Clinical Research Center (GCRC) at San Francisco General Hospital (SFGH) for their professionalism and enthusiastic assistance in our clinical study. We thank Yong Huang at the UCSF Drugs Services Unit for access to their bioanalytical facilities and Chav Doherty from UCSF SFGH Clinical Laboratory for excellent service.
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This project was supported by National Institutes of Health/National Center for Research Resources (NIH/NCRR) University of California, San Francisco (UCSF)-Clinical & Translational Science Institute (CTSI) Grant UL1 RR024131 & NIH Grant GM61390. The authors are solely responsible for the contents and do not necessarily represent the official views of the NIH. This work was also made possible in part by core services provided by the General Clinical Research Center (GCRC) at San Francisco General Hospital (SFGH), funded by the NCRR (NIH MO1-RR00083-44). The authors also acknowledge the following funding sources for SLS. (Allergan) and ECC and KMM (NIH Training Grant T32 GM007175, FDA-CDER/ORISE).
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The authors have no conflicts of interest that might be relevant to the content of this manuscript.
Ethical approval
The Committee on Human Research at the University of California, San Francisco (Institutional Review Board [IRB] 11-06968) approved the clinical drug–drug interaction study, and all subjects were recruited directly from the Study of Pharmacogenetics in Ethnically Diverse Populations (IRB 10-03167). Informed consent was obtained from all study participants.
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Morrissey, K.M., Stocker, S.L., Chen, E.C. et al. The Effect of Nizatidine, a MATE2K Selective Inhibitor, on the Pharmacokinetics and Pharmacodynamics of Metformin in Healthy Volunteers. Clin Pharmacokinet 55, 495–506 (2016). https://doi.org/10.1007/s40262-015-0332-9
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DOI: https://doi.org/10.1007/s40262-015-0332-9