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Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane
07:38

Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane

Published on: March 30, 2015

Na+/H+ exchangers in the human eccrine sweat duct

D Granger1, M Marsolais, J Burry

  • 1Université de Montréal, GEPROM, C.P. 6128, Succursale Centre-ville, Montréal, Québec, Canada H3C 3J7.

American Journal of Physiology. Cell Physiology
|July 4, 2003
PubMed

Insights

The Na+/H+ exchanger 1 (NHE1) is present in human eccrine sweat ducts, particularly at the basolateral membrane. This exchanger plays a crucial role in regulating intracellular pH within the sweat duct.

Area of Science:

  • Physiology
  • Molecular Biology
  • Cell Biology

Background:

  • The Na+/H+ exchanger 1 (NHE1) is a key protein involved in cellular pH homeostasis.
  • Its role in the human eccrine sweat duct, a critical component of thermoregulation and electrolyte balance, remains largely uncharacterized.

Purpose of the Study:

  • To investigate the presence and functional role of Na+/H+ exchanger isoform 1 (NHE1) in the human eccrine sweat duct.
  • To elucidate the contribution of NHE1 to intracellular pH regulation in this tissue.

Main Methods:

  • Immunohistochemical analysis using an anti-NHE1 antibody to localize NHE1 expression in human eccrine sweat ducts.
  • In vitro perfusion of isolated straight sweat duct portions to assess Na+/H+ mediated proton transport under various conditions, including EIPA treatment and ion removal.

Main Results:

  • NHE1 was localized to the basolateral and lateral membranes of eccrine sweat duct cells, but not the luminal membrane.
  • Basolateral EIPA induced significant intracellular acidification, while luminal EIPA had no effect.
  • Removal of bath sodium resulted in stronger acidification, and manipulation of luminal sodium and chloride levels suggested functional activity of NHE1 at the intercellular junction.

Conclusions:

  • NHE1 is expressed in the human eccrine sweat duct, primarily at the basolateral and lateral membranes.
  • Functional studies confirm that NHE1 is actively involved in regulating intracellular pH within the sweat duct epithelium.
  • These findings highlight the importance of NHE1 in maintaining cellular homeostasis in eccrine sweat glands.

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