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Updated: Feb 7, 2026

Demonstration of Proteolytic Activation of the Epithelial Sodium Channel ENaC by Combining Current Measurements with Detection of Cleavage Fragments
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Differential Assembly of Native ENaC Complexes Across Mouse Epithelial Tissues.

Arpita Bharadwaj1, Joshua Curry2, Xiao-Tong Su2

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Researchers developed a new mouse model to study the epithelial sodium channel (ENaC) in its native state. This allows for a better understanding of how ENaC assembly and regulation differ across tissues.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Physiology

Background:

  • The epithelial sodium channel (ENaC) is crucial for sodium and fluid absorption in vital organs like the lungs, kidneys, and colon.
  • Defining the structure of native ENaC complexes is challenging due to their low abundance and biochemical instability.

Purpose of the Study:

  • To develop a method for direct analysis of intact native ENaC complexes.
  • To investigate tissue-specific differences in ENaC abundance, assembly, and regulation.

Main Methods:

  • Generated a knock-in mouse model (ENaCγ-VF) with a tagged γ subunit to preserve ENaC function.
  • Employed fluorescence-detection size-exclusion chromatography and single-molecule pull-down assays.
  • Utilized dual-color analysis to distinguish fully assembled channels from broader populations.

Main Results:

  • The ENaCγ-VF mouse model accurately reflects physiological ENaC function.
  • Direct monitoring revealed significant tissue-specific variations in ENaC abundance and complex size.
  • Demonstrated heterogeneous ENaC architecture in vivo.

Conclusions:

  • The ENaCγ-VF mouse line provides a valuable tool for studying native ENaC complexes.
  • This platform facilitates the identification of proteins interacting with ENaC.
  • Epithelial environments significantly influence ENaC assembly, composition, and regulation.