Nov 1, 1975

Ionic requirements of proximal tubular sodium transport. II. Hydrogen ion

The American Journal of Physiology
R Green, G Giebisch

Abstract

Simultaneous perfusion to proximal convoluted tubules and peritubular capillaries was used to study the effects of different perfusion fluids on sodium reabsorption and hydrogen secretion, which was calculated as bicarbonate reabsorption and titratable acid. Results show that sodium reabsorption was not tightly coupled to hydrogen secretion. Bicarbonate stimulates both sodium reabsorption and hydrogen secretion, but Tris stimulates only sodium reabsorption. Imposing an adverse chloride gradient across the proximal tubule (C1- peritubular greater than C1- luminal) decreased sodium reabsorption but did not diminish hydrogen secretion. Diamox inhibited both net sodium and hydrogen transport. It is concluded that there is not firm linkage between sodium reabsorption and hydrogen secretion and that bicarbonate probably stimulates sodium transport by a number of mechanisms, including an effect on the sodium transport unrelated to its ability to increase hydrogen ion secretion.

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Mentioned in this Paper

Depression, Chemical
Sodium Ion Transport
Tromethamine
Carbonic Acid Ions
Hydrogen
Process of Secretion
Body Fluids
Sodium
Bicarbonate Measurement
Capillary Vessel

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