Abstract
This report describes a potent and selective inhibitor of multidrug and toxin extrusion (MATE) protein, pyrimethamine (PYR), and examines its effect on the urinary and biliary excretion of typical Mate1 substrates in mice. In vitro inhibition studies demonstrated that PYR is a potent inhibitor of mouse (m)Mate1 (Ki = 145 nM) among renal organic cation transporters mOctn1 and mOctn2 (Ki > 30 μM), mOct1 (Ki = 3.6 μM), and mOct2 (Ki = 6.0 μM). PYR inhibited the uptake of metformin by kidney brush-border membrane vesicles (BBMVs) (Ki = 41 nM) and canalicular membrane vesicles in the presence of outward gradient of H+. PYR treatment significantly increased the kidney-to-plasma ratio of tetraethylammonium, and both the liver- and kidney-to-plasma ratios of metformin in mice, whereas it did not affect their plasma concentrations and urinary excretion rates. Furthermore, the plasma lactate concentration, a biomarker for inhibition of gluconeogenesis by metformin, was significantly higher in the PYR-treated group than in the control group. These results not only suggest the importance of mMate1 in the efflux of organic cations into the urine and bile in mice but also the importance of canalicular efflux mediated by MATE proteins for the therapeutic efficacy of metformin. PYR is a potent inhibitor of human (h)MATE1 and hMATE2-K (Ki = 77 and 46 nM, respectively) and H+ and organic cation exchanger in human kidney BBMVs (Ki = 31 nM) in the presence of outward gradient of H+. Taken together, PYR can be used as a potent probe inhibitor of human MATE transporters.
Footnotes
- Received November 11, 2009.
- Accepted January 6, 2010.
This study was supported by the Translational Research Promotion Project, New Energy and Industrial Technology Development Organization of Japan (in 2008 to Y.S.); the Ministry of Education, Culture, Sports, Science and Technology, Jpan [Grant-in-Aid for Scientific Research on Priority Areas KAKENHI 20056005] (to H.K.); Japan Research Foundation for Clinical Pharmacology (to H.K.); and The Smoking Research Foundation (to Y.M.).
Article, publication date, and citation information can be found at http://jpet.aspetjournals.org.
doi:10.1124/jpet.109.163642.
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The online version of this article (available at http://jpet.aspetjournals.org) contains supplemental material.
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ABBREVIATIONS:
- OCT
- organic cation transporter
- TEA
- tetraethylammonium
- h
- human
- BBMV
- brush-border membrane vesicle
- OCTN
- organic cation/carnitine transporter
- MATE
- multidrug and toxin extrusion
- SNP
- single-nucleotide polymorphism
- PYR
- pyrimethamine
- HEK
- human embryonic kidney
- m
- mouse
- MES
- 2-(N-morpholino)ethanesulfonic acid
- CMV
- canalicular membrane vesicle
- GFR
- glomerular filtration rate
- LC/MS
- liquid chromatography/mass spectrometry.
- Copyright © 2010 by The American Society for Pharmacology and Experimental Therapeutics
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