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Related Experiment Videos

[The amiloride sensitive sodium channel]

P Barbry1, G Champigny, E Lingueglia

  • 1Institut de pharmacologie moléculaire et cellulaire, CNRS, Valbonne.

Nephrologie
|January 1, 1996
PubMed
Summary
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The epithelial sodium channel (ENaC) comprises alpha, beta, and gamma subunits, crucial for sodium reabsorption. Mutations in ENaC subunits cause Liddle syndrome, a form of genetic hypertension, highlighting its role in blood pressure regulation.

Area of Science:

  • Molecular Biology
  • Physiology
  • Genetics

Context:

  • The amiloride-sensitive epithelial sodium channel (ENaC) is a heterotrimeric protein complex.
  • ENaC plays a critical role in sodium ion (Na+) transport across epithelial tissues.
  • ENaC shares homology with degenerins and FaNaCh, indicating conserved structural and functional domains.

Purpose:

  • To elucidate the structure and function of the epithelial sodium channel (ENaC).
  • To investigate the role of ENaC subunits in hormonal regulation and disease.
  • To understand the molecular mechanisms underlying ENaC activity modulation.

Summary:

  • ENaC is composed of alpha, beta, and gamma subunits, featuring extracellular loops and cytoplasmic termini.
  • Mutations in the beta and gamma subunits' cytoplasmic tails cause Liddle syndrome, leading to hyperactive ENaC and hypertension.

Related Experiment Videos

  • Hormonal regulation by aldosterone and glucocorticoids differentially affects ENaC subunit transcription in various tissues.

    • Impact:

    • Provides insights into the molecular basis of genetic hypertension (Liddle syndrome).
    • Clarifies the differential regulation of ENaC by hormones in kidney, colon, and lung.
    • Establishes ENaC as a key target for understanding and potentially treating disorders of sodium balance.