title: Inhibitory effect of selective cyclooxygenase-2 inhibitor etoricoxib on human organic anion transporter 3 (hOAT3).
abstract: It is well known that nonsteroidal anti-inflammatory drugs (NSAIDs) delay the elimination of methotrexate. One of the mechanisms is thought to be inhibition of methotrexate uptake via human organic anion transporter 3 (hOAT3, SLC22A8) in the renal proximal tubule by NSAIDs. In this study, we evaluated the inhibitory effects of selective cyclooxygenase-2 inhibitor etoricoxib on hOAT3 by uptake experiments using Xenopus laevis oocytes. The injection of hOAT3 cRNA stimulated the uptake of methotrexate into the oocytes, and its transport was inhibited by etoricoxib. Etoricoxib inhibited estrone sulfate uptake by hOAT3 dose dependently, and the 50% inhibitory concentration was estimated to be 9.8 µM. Eadie-Hofstee plot analysis showed that etoricoxib inhibited hOAT3 in a competitive manner. These findings show that etoricoxib has inhibitory effect on hOAT3, and that the potential is comparable to that of traditional NSAIDs.
authors: Laboratory of Clinical Pharmacodynamics, School of Pharmacy, Aichi Gakuin University, 1-100, Nagoya-shi 464-8650, Japan.
authors: Hiroaki
authors: H
authors: Honjo
authors: Yuichi
authors: Y
authors: Uwai
authors: Kikuo
authors: K
authors: Iwamoto
mesh_terms: D000818:Animals; D052246:Cyclooxygenase 2 Inhibitors / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D000077613:Etoricoxib; D006801:Humans; D008727:Methotrexate / Q000378:metabolism; D029362:Organic Anion Transporters, Sodium-Independent / Q000037:antagonists & inhibitors*; D011725:Pyridines / Q000494:pharmacology*; D013450:Sulfones / Q000494:pharmacology*; D014982:Xenopus laevis
chemical_list: D052246:Cyclooxygenase 2 Inhibitors; D029362:Organic Anion Transporters, Sodium-Independent; D011725:Pyridines; D013450:Sulfones; C114338:organic anion transport protein 3; D000077613:Etoricoxib; D008727:Methotrexate