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The amiloride-sensitive Na+ channel: from primary structure to function

N Voilley1, A Galibert, F Bassilana

  • 1Institut de Pharmacologie, Moléculaire et Cellulaire, CNRS UPR 411 600, Sophia Antipolis, Valbonne, France.

Comparative Biochemistry and Physiology. Part A, Physiology
|November 20, 1997
PubMed
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Researchers cloned amiloride-sensitive sodium channels (alpha, beta, gamma subunits) from rat and human tissues. These channels are crucial for epithelial sodium reabsorption and hormone regulation.

Area of Science:

  • Molecular Biology
  • Physiology
  • Biochemistry

Background:

  • The amiloride-sensitive sodium channel is vital for sodium reabsorption in epithelial cells.
  • This channel's activity is modulated by hormones, particularly corticosteroids.
  • Understanding its structure and regulation is key to osmoregulation.

Purpose of the Study:

  • To clone and characterize the homologous subunits (alpha, beta, gamma) of the amiloride-sensitive sodium channel.
  • To investigate the structural similarities between these subunits and degenerins.
  • To elucidate the hormonal control mechanisms influencing epithelial sodium channel activity.

Main Methods:

  • Cloning of alpha, beta, and gamma subunits from rat distal colon and human lung.
  • Sequence analysis to identify structural motifs and homologies.

Related Experiment Videos

  • Review of existing literature on hormonal regulation and channel function.

    • Main Results:

    • Successfully cloned three homologous subunits (alpha, beta, gamma) of the amiloride-sensitive Na+ channel.
    • Identified structural similarities with Caenorhabditis elegans degenerins, including extracellular domains and transmembrane helices.
    • Established these subunits as the first members of a new gene superfamily of ionic channels.

    Conclusions:

    • The cloned subunits form the amiloride-sensitive epithelial sodium channel, critical for Na+ reabsorption.
    • Hormonal regulation, including transcriptional and post-transcriptional control by corticosteroids, fine-tunes channel activity.
    • These findings offer new insights into the function of this important osmoregulatory system.