measurements of the ouabain-sensitive qo2 in the presence of nystatin , the tissue sodium and potassium contents of the tubules in suspension , and the sodium- and potassium-dependent adenosinetriphosphatase ( na , k-atpase ) activity of lysed tubule membranes indicated that the effect of amiloride was due to a direct inhibition of the na , k-atpase activity of the proximal tubule .
C0032821
potassium
C0002502
amiloride