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Related Experiment Videos

Amiloride-sensitive Na channels

J D Horisberger1

  • 1Institute of Pharmacology and Toxicology, Lausanne, Switzerland. Jean-Daniel.Horisberger@ipharm.unil.ch

Current Opinion in Cell Biology
|August 28, 1998
PubMed
Summary
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New epithelial sodium channels in mammalian neurons may play a role in pain. Research is uncovering how these channels are regulated by hormones, degradation, and proteases.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Physiology

Background:

  • The epithelial sodium channel/degenerin (ENaC/Deg) family is expanding, with new members found in mammalian neurons.
  • These channels are implicated in pain transmission, and their structure (e.g., four-subunit stoichiometry) and function (e.g., pore, selectivity filter, amiloride binding site, gating) are being elucidated.
  • Understanding ENaC/Deg regulation is crucial for comprehending neuronal function and pain pathways.

Purpose of the Study:

  • To review recent advances in understanding the regulatory mechanisms of the epithelial sodium channel/degenerin family, particularly in mammalian neurons.
  • To highlight progress in identifying functional domains and regulatory processes controlling these channels.

Main Methods:

  • Literature review of recent experimental evidence.

Related Experiment Videos

  • Analysis of studies investigating channel structure, function, and regulation.
  • Focus on hormonal control, protein degradation pathways, and protease activity.

    • Main Results:

    • Progress has been made in attributing specific functional elements to protein domains.
    • Key regulatory mechanisms identified include mineralocorticoid hormone control of ENaC translation.
    • Endocytosis and ubiquitination-mediated degradation control channel density.
    • Extracellular proteases also play a role in channel regulation.

    Conclusions:

    • Significant progress has been made in understanding the regulation of ENaC/Deg channels in the past year.
    • These channels, particularly neuronal members, are complex and subject to multiple layers of control.
    • Further research is needed to fully elucidate their roles in physiological processes like pain transmission.