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Epithelial sodium channels: function, structure, and regulation

H Garty1, L G Palmer

  • 1Department of Membrane Research and Biophysics, Weizmann Institute of Science, Rehovot, Israel.

Physiological Reviews
|April 1, 1997
PubMed
Summary
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Epithelial sodium channels (ENaC) are crucial for electrolyte balance. This review details their biophysical, molecular, and regulatory properties, focusing on amiloride-blockable channels.

Area of Science:

  • Physiology
  • Molecular Biology
  • Biophysics

Background:

  • High-resistance epithelia utilize Na+ channels on apical membranes, historically identified by amiloride sensitivity.
  • These channels are vital for active sodium reabsorption and maintaining electrolyte and water homeostasis across vertebrates.
  • Previous classifications relied on biophysical and pharmacological traits.

Purpose of the Study:

  • To review the biophysical characteristics, molecular properties, and regulatory mechanisms of epithelial amiloride-blockable Na+ channels.
  • To highlight recent advancements in understanding these channels, particularly those involving cloned epithelial Na+ channels (ENaC) subunits.
  • To discuss the role of purified amiloride-binding proteins in channel characterization.

Main Methods:

Related Experiment Videos

  • Characterization of amiloride-blockable Na+ channels in various epithelia.
  • Cloning and molecular definition of epithelial Na+ channel (ENaC) subunits (alpha, beta, gamma).
  • Analysis of biophysical properties, molecular structures, and regulatory pathways.

    • Main Results:

    • Identified epithelial Na+ channels (ENaC) as a molecularly defined class of amiloride-blockable channels.
    • Established ENaC as a key Na+ conductor in absorbing and secretory epithelia.
    • Linked ENaC to mechanosensation pathways.

    Conclusions:

    • Epithelial Na+ channels (ENaC) are fundamental to epithelial function and ion transport.
    • Molecular cloning has provided a precise definition for a significant subset of amiloride-sensitive Na+ channels.
    • Further research using cloned subunits and purified proteins continues to elucidate channel regulation and function.