Reduced renal clearance of a zwitterionic substrate cephalexin in MATE1-deficient mice.

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Citation

Watanabe S, Tsuda M, Terada T, Katsura T, Inui K

Reduced renal clearance of a zwitterionic substrate cephalexin in MATE1-deficient mice.

J Pharmacol Exp Ther. 2010 Aug;334(2):651-6. doi: 10.1124/jpet.110.169433. Epub 2010 May 19.

PubMed ID
20484555 [ View in PubMed
]
Abstract

Multidrug and toxin extrusion 1 (MATE1/solute carrier 47A1) mediates the transport of not only organic cations but also zwitterions such as cephalexin. However, the contribution of MATE1 to tubular secretion of cephalexin in vivo has not been elucidated. In the present study, we carried out transport experiments of cephalexin via MATE1 and performed pharmacokinetic analyses of cephalexin in Mate1 knockout [Mate1(-/-)] mice. Cephalexin uptake by human MATE1-expressing human embryonic kidney 293 cells exhibited saturable kinetics (K(m) = 5.9 +/- 0.5 mM) and a bell-shaped pH profile with a maximum at pH 7.0. We confirmed that mouse MATE1 also transported cephalexin. After a single intravenous administration of cephalexin (5 mg/kg), Mate1(-/-) mice showed higher plasma concentrations of cephalexin than wild-type [Mate1(+/+)] mice. The urinary excretion of cephalexin for 60 min was significantly reduced, and the renal concentration was markedly increased in Mate1(-/-) mice compared with Mate1(+/+) mice. The renal clearance of cephalexin in Mate1(-/-) mice was approximately 60% of that in Mate1(+/+) mice and seemed to be near the creatinine clearance. In contrast, there were no significant differences between both mice in the pharmacokinetics of anionic cefazolin, which is not a substrate for MATE1. In this study, we demonstrated that MATE1 is responsible for renal tubular secretion of a zwitterionic substrate cephalexin in vivo.

DrugBank Data that Cites this Article

Drug Transporters
DrugTransporterKindOrganismPharmacological ActionActions
CephalexinMultidrug and toxin extrusion protein 1ProteinHumans
Unknown
Substrate
Details