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Updated: Aug 13, 2026

Analysis of Nephron Composition and Function in the Adult Zebrafish Kidney
Published on: August 9, 2014
Intracellular pH in diluting segment of frog kidney
High potassium levels stimulate acid secretion in frog kidneys. This study reveals an amiloride-sensitive mechanism, likely sodium-hydrogen exchange, responsible for maintaining intracellular pH balance in kidney cells.
Area of Science:
- Renal Physiology
- Cellular Biology
- Ion Transport
Background:
- Chronic high potassium (K+ adaptation) enhances H+ secretion in the frog kidney's diluting segment.
- Understanding the cellular mechanisms of this H+ secretion is crucial for renal physiology.
Purpose of the Study:
- To investigate the cellular mechanism of H+ secretion in K+ adapted frog diluting segment.
- To determine the role of ion transport in maintaining intracellular pH (pHi).
Main Methods:
- Intracellular pH (pHi) measurements using pH-sensitive microelectrodes in isolated frog kidneys.
- Rapid perfusion of the tubule lumen with various solutions to alter ion concentrations and drug exposure.
- Monitoring cell membrane potential changes in response to luminal ion modifications.
Main Results:
- Complete removal of luminal Na+ significantly decreased pHi (7.61 to 7.18).
- Luminal amiloride application also caused a significant decrease in pHi (0.15).
- Neither furosemide nor luminal Cl- reduction altered pHi, suggesting these are not primary regulators of pHi in this context.
Conclusions:
- An amiloride-sensitive H+ extrusion mechanism is present in the luminal membrane of the K+ adapted frog diluting segment.
- This mechanism is consistent with Na+/H+ exchange, which plays a key role in maintaining cellular pHi under varying conditions.
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