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Related Experiment Videos

Update on renal acidification: a physiological view

G Capasso1, C Saviano, M Rizzo

  • 1Chair of Nephrology, Second University of Naples, Italy. gcapasso@cds.unina.it

Mineral and Electrolyte Metabolism
|January 1, 1997
PubMed
Summary
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The kidney regulates acid-base balance using Na+/H+ exchangers and H(+)-ATPases. The Na+/H+ exchanger is key for proximal tubule acid secretion, while H(+)-ATPase dominates in the distal tubule.

Area of Science:

  • Nephrology
  • Physiology
  • Molecular Biology

Background:

  • The kidney is crucial for maintaining acid-base homeostasis.
  • Acid secretion in the tubular lumen is primarily mediated by two key proteins: the sodium-hydrogen exchanger (Na+/H+ exchanger) and the hydrogen-translocating ATPase (H(+)-ATPase).

Purpose of the Study:

  • To elucidate the roles of Na+/H+ exchangers and H(+)-ATPases in renal acid-base regulation.
  • To investigate the involvement of these proteins in intracellular pH (pHi) regulation and their specific contributions along different nephron segments.

Main Methods:

  • In vivo and in vitro microperfusion studies.
  • Analysis of isolated membrane vesicles.
  • Molecular biology techniques to identify and characterize protein isoforms.

Related Experiment Videos

Main Results:

  • The Na+/H+ exchanger is the primary mechanism for H+ secretion and HCO3- reabsorption in the proximal nephron.
  • At least five isoforms of the Na+/H+ exchanger exist, with NHE-1 as the housekeeping isoform and NHE-3 implicated in transepithelial transport.
  • H(+)-ATPase is the main acid extruder in the distal nephron and contributes to bicarbonate reabsorption in the proximal tubule, especially during high acid loads.

Conclusions:

  • The Na+/H+ exchanger and H(+)-ATPase play distinct yet vital roles in renal acid-base balance and pHi regulation.
  • Dysfunction or absence of H(+)-ATPase in the distal nephron may lead to distal tubular acidosis.