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Research ArticleArticle

PREDOMINANT CONTRIBUTION OF OATP1B3 TO THE HEPATIC UPTAKE OF TELMISARTAN, AN ANGIOTENSIN II RECEPTOR ANTAGONIST, IN HUMANS

Naoki Ishiguro, Kazuya Maeda, Wataru Kishimoto, Asami Saito, Akiko Harada, Thomas Ebner, Willy Roth, Takashi Igarashi and Yuichi Sugiyama
Drug Metabolism and Disposition July 2006, 34 (7) 1109-1115; DOI: https://doi.org/10.1124/dmd.105.009175
Naoki Ishiguro
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Kazuya Maeda
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Wataru Kishimoto
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Asami Saito
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Akiko Harada
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Thomas Ebner
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Willy Roth
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Takashi Igarashi
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Yuichi Sugiyama
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Abstract

Telmisartan, a nonpeptide angiotensin II receptor antagonist, is selectively distributed to liver. In the present study, we have characterized the contribution of organic anion transporting polypeptide (OATP) isoforms to the hepatic uptake of telmisartan by isolated rat hepatocytes, human cryopreserved hepatocytes, and human transporter-expressing cells. Because it is difficult to evaluate the transport activity of telmisartan because of its extensive adsorption to cells and culture materials, we performed the uptake study in the presence of human serum albumin. The saturable uptake of telmisartan into isolated rat hepatocytes took place in a Na+-independent manner and was inhibited by pravastatin, taurocholate, and digoxin, which are Oatp substrates and inhibitors, but not by organic cation, tetraethylammonium, indicating the involvement of Oatp isoforms in its uptake into rat hepatocytes. To identify which human OATP transporters are important for the hepatic uptake of telmisartan, the uptake assay was carried out using OATP1B1- and OATP1B3-expressing human embryonic kidney 293 cells and cryopreserved human hepatocytes. The uptake of telmisartan by OATP1B3-expressing cells was saturable (Km = 0.81 μM) and significantly higher than that by vector-transfected cells. In contrast, no significant uptake was observed in OATP1B1-expressing cells. We also observed the saturable uptake of telmisartan by human hepatocytes. Thirty micromolar estrone-3-sulfate, which can selectively inhibit OATP1B1-mediated uptake compared with OATP1B3, did not inhibit the uptake of telmisartan in human hepatocytes, whereas it could inhibit the uptake of estradiol 17β-d-glucuronide mediated by OATP1B1. These results suggest that OATP1B3 is predominantly involved in the hepatic uptake of telmisartan in humans.

Footnotes

  • This work was supported in part by a Health and Labor Sciences Research Grants from Ministry of Health, Labor, and Welfare for the Research on Advanced Medical Technology and Grant-in Aid for Young Scientists (B) (17790113) from the Ministry of Education, Culture, Sports, Science, and Technology.

  • Article, publication date, and citation information can be found at http://dmd.aspetjournals.org.

  • doi:10.1124/dmd.105.009175.

  • ABBREVIATIONS: AUC, area under the plasma concentration-time curve; OATP, organic anion transporting polypeptide; E217βG, estradiol 17β-d-glucuronide; CCK-8, cholecystokinin octapeptide; E-sul, estrone-3-sulfate; TEA, tetraethylammonium; HEK, human embryonic kidney; HSA, human serum albumin.

  • The American Society for Pharmacology and Experimental Therapeutics
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Drug Metabolism and Disposition: 34 (7)
Drug Metabolism and Disposition
Vol. 34, Issue 7
1 Jul 2006
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Research ArticleArticle

PREDOMINANT CONTRIBUTION OF OATP1B3 TO THE HEPATIC UPTAKE OF TELMISARTAN, AN ANGIOTENSIN II RECEPTOR ANTAGONIST, IN HUMANS

Naoki Ishiguro, Kazuya Maeda, Wataru Kishimoto, Asami Saito, Akiko Harada, Thomas Ebner, Willy Roth, Takashi Igarashi and Yuichi Sugiyama
Drug Metabolism and Disposition July 1, 2006, 34 (7) 1109-1115; DOI: https://doi.org/10.1124/dmd.105.009175

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Research ArticleArticle

PREDOMINANT CONTRIBUTION OF OATP1B3 TO THE HEPATIC UPTAKE OF TELMISARTAN, AN ANGIOTENSIN II RECEPTOR ANTAGONIST, IN HUMANS

Naoki Ishiguro, Kazuya Maeda, Wataru Kishimoto, Asami Saito, Akiko Harada, Thomas Ebner, Willy Roth, Takashi Igarashi and Yuichi Sugiyama
Drug Metabolism and Disposition July 1, 2006, 34 (7) 1109-1115; DOI: https://doi.org/10.1124/dmd.105.009175
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