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Related Experiment Videos

Na+-H+ antiporter in posthypercapnic state.

W C Yang1, J A Arruda, Z Talor

  • 1Department of Medicine, University of Illinois at Chicago.

The American Journal of Physiology
|November 1, 1987
PubMed
Summary
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Posthypercapnic metabolic alkalosis is linked to an enhanced Na+-H+ antiporter. This transporter

Area of Science:

  • Nephrology
  • Renal Physiology
  • Acid-Base Balance

Background:

  • Posthypercapnic metabolic alkalosis is a complex acid-base disturbance.
  • Previous research indicated chronic hypercapnia enhances Na+-H+ antiporter Vmax.
  • The role of this enhanced antiporter in maintaining alkalosis was unclear.

Purpose of the Study:

  • To investigate the role of the Na+-H+ antiporter's Vmax in posthypercapnic metabolic alkalosis.
  • To determine if enhanced antiporter activity contributes to bicarbonate retention.

Main Methods:

  • Kinetics of the Na+-H+ antiporter were measured using acridine orange fluorescence quenching.
  • Brush-border membranes were isolated from control and posthypercapnic rabbits.
  • Measurements were taken at various time points after returning to normocapnia.

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Main Results:

  • Vmax of the Na+-H+ antiporter was significantly increased at 3 and 24 hours posthypercapnia, but not at 48 hours.
  • No significant changes in Km were observed, indicating altered transporter capacity, not affinity.
  • Increased Vmax was attributed to electroneutral Na+-H+ exchange, not conductive pathways.

Conclusions:

  • Enhanced Na+-H+ antiporter Vmax contributes to the maintenance of posthypercapnic metabolic alkalosis.
  • This effect is primarily mediated by the electroneutral exchange mechanism.
  • Bicarbonate concentration was elevated at early posthypercapnic time points.