Effects of Angiotensin II Receptor Blockers on Renal Handling of Uric Acid in Rats

  • LI Yan
    Tokyo University of Science, Faculty of Pharmaceutical Sciences
  • SATO Masanobu
    Tokyo University of Science, Faculty of Pharmaceutical Sciences Faculty of Parmacy, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • YANAGISAWA Yuichi
    Tokyo University of Science, Faculty of Pharmaceutical Sciences
  • MAMADA Hideaki
    Tokyo University of Science, Faculty of Pharmaceutical Sciences Faculty of Parmacy, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • FUKUSHI Akimasa
    Tokyo University of Science, Faculty of Pharmaceutical Sciences Faculty of Parmacy, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • MIKAMI Kentaro
    Tokyo University of Science, Faculty of Pharmaceutical Sciences
  • SHIRASAKA Yoshiyuki
    Tokyo University of Science, Faculty of Pharmaceutical Sciences Faculty of Parmacy, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • TAMAI Ikumi
    Tokyo University of Science, Faculty of Pharmaceutical Sciences Faculty of Parmacy, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University

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  • Effects of angiotensin II receptor blockers on renal handling of urate in rats

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Abstract

  Elevated serum uric acid level has been associated with increased cardiovascular risk in hypertensive patients. Several angiotensin II receptor blockers exhibit differential effects on regulation of serum uric acid level in humans. We have demonstrated that some angiotensin II receptor blockers trans-stimulate the uptake of uric acid by human URAT1 and others inhibit the transport of uric acid mediated by human URAT1, OAT1, OAT3 and MRP4 in vitro. This study investigated the effects of candesartan, pratosartan and telmisartan on renal handling of uric acid in rats in vivo and in vitro. Candesartan (0.1 mg/kg) significantly decreased the urinary excretion of uric acid and increased the plasma uric acid concentration. The kidney candesartan level after low-dose treatment is close to that required to trans-stimulate uric acid uptake in vitro. Pratosartan exhibited dose-dependent hypouricemic and uricosuric effects, while telmisartan showed no effects on plasma uric acid level. Furthermore, we confirmed the effects of the tested drugs on uric acid transport by rat renal brush border membrane transporter(s) and basolateral Oat1 and Oat3. Effects of angiotensin II receptor blockers in rats may be mainly determined by their intrinsic effects (cis-inhibition and trans-stimulation) on uric acid reabsorption transporter(s) and their pharmacokinetic properties in rats.<br>

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