Role for epithelial Na+ channels and putative Na+/H+ exchangers in salt taste transduction in rats

The American Journal of Physiology
R F LundyR J Contreras

Abstract

The effects of the epithelial Na+ channel antagonists amiloride and benzamil and the Na+/H+ exchange antagonist 5-(N,N-dimethyl)-amiloride (DMA)-Cl on the integrated responses of the chorda tympani nerve to 30, 75, 150, 300, and 500 mM concentrations of NaCl, KCl, and NH4Cl were assessed in male Sprague-Dawley rats. Based on evidence from other systems, 1 and 25 microM amiloride and benzamil were chosen to selectively inhibit epithelial Na+ channels and 1 microM DMA was chosen to selectively inhibit Na+/H+ exchange. When added to stimulating salt solutions, amiloride, benzamil, and DMA were each effective in inhibiting responses to all three salts. The degree of inhibition varied with drug, salt, and salt concentration, but not drug dose. Amiloride suppressed NaCl responses to a greater degree than KCl and NH4Cl responses, whereas DMA suppressed NH4Cl responses to a greater degree than NaCl and KCl responses. In all but one case (25 microM amiloride added to KCl), drug suppression of taste nerve responses decreased with an increase in salt concentration. The present results suggest that 1) epithelial Na+ channels in rat taste receptor cells may play a role in KCl and NH4Cl taste transduction; 2) a Na+/H+ exchange protein may be...Continue Reading

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Citations

Aug 20, 2002·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Laura C GeranAlan C Spector
Oct 12, 2002·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Lynnette Phillips McCluskey, David L Hill
Apr 30, 2020·Nutrients·Albertino Bigiani

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