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Related Experiment Video

Updated: Jan 3, 2026

Demonstration of Proteolytic Activation of the Epithelial Sodium Channel ENaC by Combining Current Measurements with Detection of Cleavage Fragments
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Regulating ENaC's gate.

Thomas R Kleyman1, Douglas C Eaton2

  • 1Renal-Electrolyte Division, Department of Medicine, and Departments of Cell Biology and of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, Pennsylvania.

American Journal of Physiology. Cell Physiology
|November 14, 2019
PubMed
Summary
This summary is machine-generated.

Epithelial sodium channels (ENaCs) sense the environment and are regulated by proteases, Na+, and lipids. Understanding these factors is key to ENaC function and related human disorders.

Keywords:
ASICENaCgatingpalmitoylationphosphatidylinositolproteasesodium

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Physiology

Background:

  • Epithelial sodium channels (ENaCs) are crucial cation channels involved in sensing the extracellular environment.
  • ENaCs regulate ion transport and cellular function through complex activation and inhibition mechanisms.

Purpose of the Study:

  • To review the regulatory factors influencing ENaC open probability.
  • To discuss the impact of ENaC dysregulation on human disorders.

Main Methods:

  • Structural analysis of ENaC and related channels.
  • Review of biochemical and physiological studies on ENaC regulation.

Main Results:

  • ENaCs possess highly organized extracellular regions with inhibitory tracts and protease cleavage sites.
  • Activation involves protease cleavage, while inhibition occurs via Na+ binding.
  • Inositol phospholipids and Cys-palmitoylation enhance ENaC open probability.

Conclusions:

  • Multiple factors, including proteases, Na+, lipids, and palmitoylation, concertedly regulate ENaC activity.
  • Understanding these regulatory mechanisms is vital for addressing ENaC-associated human diseases.