RENAL TUBULE TRANSPORT AND ELECTROLYTE EFFECTS OF AMILORIDE IN THE CHICKEN

  • 1 January 1981
    • journal article
    • research article
    • Vol. 219  (2) , 435-441
Abstract
By using the Sperber technique in nonanesthetized chickens, amiloride [K-sparing mild diuretic] was actively secreted by the renal tubule. This active secretion could be blocked by the simultaneous infusions of the organic cations guanidine, quinine and mepiperphenidol, but not by the organic anion probenecid. Amiloride was transported by the organic cation transport system of the renal tubule. A significant part of the amiloride which bypassed the infused kidney was taken up by the peripheral tissues, resulting in a recovery of amiloride smaller than that of simultaneously infused p-aminohippurate. During the infusion of amiloride, a dose-dependent ipsilateral mild natriuresis was observed. A maximum ipsilateral antikaliuretic effect and increase in pH were found when 5 .times. 10-9 mol/kg .cntdot. min of amiloride were reaching the infused kidney. Amiloride probably is secreted from blood to urine by the proximal tubule and exerts its natriuretic and kaliuretic effects as the luminal surface of the distal tubule.

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