PMID: 8945995Nov 1, 1996Paper

Inhibition of basolateral potassium conductance by taurine in the proximal convoluted tubule

The American Journal of Physiology
S BretonR Laprade

Abstract

The effect of taurine on the electrophysiological properties of the basolateral membrane of the rabbit proximal convoluted tubule was examined. Short-duration isosmotic pulses of 40 mM taurine in the bath solution induced basolateral membrane depolarizations (delta Vbl) of 6.44 +/- 0.5 mV, which were reduced by 58% in absence of Na+. In presence of barium and quinine, delta Vbl values were reduced by 55% in Na(+)-containing bath solutions and were completely abolished in Na(+)-free solutions. Continuous addition of taurine into the bath solutions for a period of 5 min induced 1) a decrease in the partial conductance of the basolateral membrane to K+ (tK) from 0.39 to 0.23; 2) an increase in the partial conductance to Cl- (tcl) from 0.055 to 0.172; 3) a rapid and transient increase of the partial conductance mediated by the Na-HCO3 cotransporter (tNaHCO3) from 0.37 to 0.52, followed by a progressive decrease to 0.29; and 4) a depolarization of the basolateral membrane of 16 mV. The absolute membrane conductance mediated by the Na-HCO3 cotransporter was not initially affected by taurine, whereas that to K (GK) initially decreased by a maximal factor of 2 after 1 min, followed by a partial recovery after 5 min, and that to Cl (GCl...Continue Reading

Citations

Dec 25, 2004·Physiological Reviews·Steven C HebertWenhui Wang

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