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• W2000668649 abstract "1. Amiloride, applied at millimolar concentrations, results in the blockade of K+ conductance in amphibian proximal convoluted cells (PCT), fused into giant cells. 2. Amiloride results directly in a blockade of K+ conductance that is not related to inhibition of the Na(+)-H+ antiport, which would lower intracellular pH, adversely affecting K+ conductance. On the contrary, high amiloride concentrations promote entry of this lipophilic base in the cell, leading to higher cell pH. 3. Under voltage clamp conditions, control vs. amiloride, current-voltage curves from PCT fused giant cells intersect at -86.2 +/- 3.4 mV, a value close to the equilibrium potential for potassium. 4. Hexamethylene amiloride, 10(-5) M, irreversibly depolarizes the membrane potential. 5. Barium decreased by 50% the initial slope of realkalinization, following removal of a solution containing NH4Cl, as did amiloride. In addition, these blockers reduced membrane conductance by 40%, suggesting that a fraction of the amiloride-suppressible NH4+ efflux may be conductive. 6. Amiloride does not directly inhibit the Na(+)-K+, ATPase in our preparation, contrary to the prevalent belief. 7. In vivo studies show that amiloride interferes with an apical K+ conductance but it does not alter basolateral K+ conductance." @default.
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• W2000668649 date "1992-10-01" @default.
• W2000668649 modified "2023-09-26" @default.
• W2000668649 title "Millimolar amiloride concentrations block K conductance in proximal tubular cells" @default.
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• W2000668649 doi "https://doi.org/10.1111/j.1476-5381.1992.tb12779.x" @default.
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