Summary
Two methods, the measurement of the response of the basolateral membrane potential (V bl) of proximal tubule cells ofNecturus to step changes in basolateral K+ concentration, and cellular cable analysis, were used to assess the changes in basolateral potassium conductance (G K) caused by a variety of maneuvers. The effects of some of these maneuvers on intracellular K+ activity (a iK ) were also evaluated using double-barreled ion-selective electrodes. Perfusion with 0mm K+ basolateral solution for 15 min followed by 45 min of 1mm K+ solution resulted in a fall in basolateral potassium (apparent) transference number (t K),V bl anda iK . Results of cable analysis showed that total basolateral resistance,R b , rose. The electrophysiological effects of additional manipulations, known to inhibit net sodium reabsorption across the proximal tubular epithelium ofNecturus, were also investigated. Ouabain caused a fall int K accompanied by large decreases ina iK andV bl. Lowering luminal sodium caused a fall int K and a small reduction inV bl. Selective reduction of peritubular sodium, a maneuver that has been shown to block sodium transport from lumen to peritubular fluid, also resulted in a significant decrease int K. These results suggest thatG K varies directly with rate of transport of the sodium pump, irrespective of the mechanism of change in pump turnover.
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Part of this material has been presented at the 10th International Conference on Biological Membranes (Cohen & Giebisch, 1984).
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Matsumura, Y., Cohen, B., Guggino, W.B. et al. Regulation of the basolateral potassium conductance of theNecturus proximal tubule. J. Membrain Biol. 79, 153–161 (1984). https://doi.org/10.1007/BF01872119
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DOI: https://doi.org/10.1007/BF01872119