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ENaC activation by proteases.

Deepika Anand1,2, Edith Hummler1,2, Olivia J Rickman1,2

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Channel-activating proteases (CAPs) regulate the epithelial sodium channel (ENaC) and are implicated in diseases. Understanding CAPs offers potential therapeutic targets for aberrant sodium homeostasis.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Physiology

Background:

  • Proteases are crucial for biological processes; dysregulated activity causes disease.
  • Channel-activating proteases (CAPs) modulate ion transport, particularly epithelial sodium channels (ENaC).
  • Initial studies identified CAP1, CAP2, and CAP3 as in vitro ENaC regulators.

Purpose of the Study:

  • To review recent findings on CAPs and their role in ENaC activation.
  • To discuss the implications of dysregulated CAPs in pathophysiological conditions.
  • To explore the therapeutic potential of targeting CAPs for diseases involving sodium homeostasis.

Main Methods:

  • Review of literature on CAPs and ENaC.
  • Analysis of findings from animal models with organ-specific protease knockouts.
  • Discussion of evidence for protease involvement in ENaC activity.

Main Results:

  • Multiple proteases (serine, cysteine, metalloproteases) act as in vitro CAPs for ENaC.
  • Animal models show proteases increase ENaC activity, though specific activators remain unidentified.
  • Dysregulated CAPs are linked to epithelial phenotypes in various diseases.

Conclusions:

  • Proteases are key regulators of ENaC activity.
  • Dysfunctional CAPs contribute to epithelial disorders and aberrant sodium homeostasis.
  • Targeting CAPs presents a promising therapeutic strategy for related diseases.