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Molecular Pharmacology

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Research ArticleArticle

Transport Properties of Nonsteroidal Anti-Inflammatory Drugs by Organic Anion Transporter 1 Expressed in Xenopus laevisOocytes

Nopporn Apiwattanakul, Takashi Sekine, Arthit Chairoungdua, Yoshikatsu Kanai, Noriko Nakajima, Samaisukh Sophasan and Hitoshi Endou
Molecular Pharmacology May 1999, 55 (5) 847-854;
Nopporn Apiwattanakul
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Takashi Sekine
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Arthit Chairoungdua
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Yoshikatsu Kanai
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Noriko Nakajima
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Samaisukh Sophasan
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Hitoshi Endou
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Abstract

Organic anion transporter 1 (OAT1) is thepara-aminohippurate (PAH) transporter in the basolateral membrane of the proximal tubule. The present study investigated whether or not nonsteroidal anti-inflammatory drugs (NSAIDs) are transported by OAT1. All of the NSAIDs tested inhibited [14C]PAH uptake via OAT1 expressed in Xenopus laevis oocytes. Ibuprofen, indomethacin, salicylurate, and naproxen showed the strongest potency to inhibit [14C]PAH uptake (Ki∼ 2–10 μM); acetylsalicylate, salicylate, and phenacetin exhibited moderate potency (Ki ∼ 300–400 μM), and acetaminophen (paracetamol) exhibited the weakest inhibitory potency (Ki ∼ 2 mM). Radiolabeled acetylsalicylate, salicylate, and indomethacin were taken up by OAT1 and the uptake rate of these three NSAIDs was enhanced by the outwardly directed dicarboxylate gradient. The efflux of the preloaded [14C]PAH from the oocytes via OAT1 wastrans-stimulated by PAH and glutarate added to the media. The addition of salicylate, acetylsalicylate, or salicylurate into the media also trans-stimulated the efflux of PAH, whereas indomethacin did not. The present study indicates that OAT1 is responsible for the renal uptake and secretion of NSAIDs.

Footnotes

  • Send reprint requests to: Dr. Hitoshi Endou, Department of Pharmacology and Toxicology, Kyorin University School of Medicine, 6-20-2 Shinkawa, Mitaka, Tokyo 181-8611, Japan. E-mail:endouh{at}kyorin-u.ac.jp

  • This work was supported in part by grants from the Japanese Ministry of Education, Science, Sports, and Culture; the Science Research Promotion Fund of the Japan Private School Promotion Foundation; Uehara Memorial Foundation; and the Tokyo Biochemical Research Foundation.

  • Abbreviations:
    OAT1
    organic anion transporter 1
    rNaDC-1
    rat sodium-dependent dicarboxylate transporter
    PAH
    para-aminohippurate
    NSAID
    nonsteroidal anti-inflammatory drug
    • Received August 31, 1998.
    • Accepted February 12, 1999.
  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 55 (5)
Molecular Pharmacology
Vol. 55, Issue 5
1 May 1999
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Research ArticleArticle

Transport Properties of Nonsteroidal Anti-Inflammatory Drugs by Organic Anion Transporter 1 Expressed in Xenopus laevisOocytes

Nopporn Apiwattanakul, Takashi Sekine, Arthit Chairoungdua, Yoshikatsu Kanai, Noriko Nakajima, Samaisukh Sophasan and Hitoshi Endou
Molecular Pharmacology May 1, 1999, 55 (5) 847-854;

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Research ArticleArticle

Transport Properties of Nonsteroidal Anti-Inflammatory Drugs by Organic Anion Transporter 1 Expressed in Xenopus laevisOocytes

Nopporn Apiwattanakul, Takashi Sekine, Arthit Chairoungdua, Yoshikatsu Kanai, Noriko Nakajima, Samaisukh Sophasan and Hitoshi Endou
Molecular Pharmacology May 1, 1999, 55 (5) 847-854;
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