Abstract
Previous experiments in the early distal tubule of the doubly perfused kidney ofAmphiuma demonstrated net reabsorption of potassium (K) which is reversed to net K secretion after K adaptation. Furthermore, it is known that this particular segment exhibits extensive chloride (Cl) net reabsorption which depends on the presence of sodium (Na) and which is inhibited by furosemide. In order to test for a possible interrelationship between NaCl and K transport, K activity in lumen and cell, transepithelial electrical potential difference, peritubular cell membrane potentials and volume reabsorption were measured in control animals and after K adaptation, in presence and absence of furosemide.
In control animals the direction of net K transport is reversed from reabsorption to secretion upon addition of furosemide or following the removal of Cl from the tubular lumen. Volume reabsorption is inhibited by some 80%. In K adapted animals a similar inhibition of volume reabsorption is observed, however K secretion is not further enhanced. In control as well as in K-adpated animals intracellular K activities are still above electrochemical equilibrium after furosemide.
The data suggest that a common transport system for Na, Cl and K is present in the luminal cell membrane which is inhibited by furosemide, K secretion observed in controls after furosemide and in K-adapted animals is driven by the cell to lumen electrochemical gradient for K across the K permeable luminal cell membrane. The shift of the luminal pump-leak system towards K secretion following K adaptation may be explained by an increase of the luminal K conductance and/or by a reduction of the activity of the luminal cotransport system. However, other mechanisms may also contribute to the observed phenomenon of K adaptation and cannot be ruled out at present.
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This work was supported by NIH Grant PHS AM 17633 and AM 29848. Dr. H. Oberleithner received support from Fogarty International Fellowship SF505 TWO 3865-02.
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Oberleithner, H., Guggino, W. & Giebisch, G. The effect of furosemide on luminal sodium, chloride and potassium transport in the early distal tubule ofAmphiuma kidney. Pflugers Arch. 396, 27–33 (1983). https://doi.org/10.1007/BF00584694
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DOI: https://doi.org/10.1007/BF00584694