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Related Experiment Videos

Associated proteins and renal epithelial Na+ channel function

I I Ismailov1, B K Berdiev, A L Bradford

  • 1Department of Physiology and Biophysics, University of Alabama at Birmingham 35294, USA.

The Journal of Membrane Biology
|January 1, 1996
PubMed
Summary

The study found that the epithelial sodium channel (ENaC) is a core component of renal sodium channels. Dithiothreitol (DTT) treatment revealed ENaC

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Area of Science:

  • Nephrology
  • Molecular Biology
  • Ion Channel Physiology

Background:

  • Amiloride-sensitive Na+ channels are crucial for renal sodium reabsorption.
  • The precise molecular composition of these channels, particularly in the renal collecting tubule, remains incompletely understood.
  • Epithelial sodium channel (ENaC) subunits are known components of sodium channels in various epithelia.

Purpose of the Study:

  • To investigate whether ENaC subunits form the core conduction component of amiloride-sensitive Na+ channel complexes from bovine renal papillary collecting tubules.
  • To functionally and immunologically characterize these renal Na+ channel complexes.

Main Methods:

  • Incorporation of purified renal Na+ channels into planar lipid bilayers for electrophysiological recordings.

Related Experiment Videos

  • Treatment with dithiothreitol (DTT) to reduce disulfide bonds.
  • Bi-ionic potential measurements to assess cation permeability.
  • Measurement of amiloride binding affinity (K(amil)i).
  • Assessment of mechanosensitivity and PKA regulation.
  • Immunological detection using antibodies against alpha bENaC.

    • Main Results:

    • DTT treatment reduced single channel conductance and uncoupled PKA regulation, suggesting structural changes.
    • DTT treatment did not alter cation permeability sequence or basal amiloride affinity.
    • DTT-treated channels exhibited mechanosensitivity, similar to ENaC, with stretch decreasing amiloride affinity.
    • Stretch activation led to altered cation selectivity and Ca2+ permeability.
    • Antibodies against alpha bENaC recognized a 70 kDa polypeptide in the renal channel complex.

    Conclusions:

    • ENaC is likely a fundamental subunit within the immunopurified renal Na+ channel complex.
    • PKA sensitivity appears to be conferred by associated proteins rather than ENaC itself.
    • These findings elucidate the molecular basis of sodium transport in the renal collecting tubule.