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Related Experiment Videos

Sodium channels in ocular epithelia.

M A Watsky1, K Cooper, J L Rae

  • 1Department of Physiology and Biophysics, Mayo Foundation, Rochester, MN 55905.

Pflugers Archiv : European Journal of Physiology
|November 1, 1991
PubMed
Summary

Voltage-gated sodium channels, crucial for cell excitability, were found in non-cultured rabbit corneal endothelium and frog lens epithelium. These channels are also present in six cultured ocular epithelial cell types.

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Area of Science:

  • Physiology
  • Molecular Biology
  • Ophthalmology

Background:

  • Voltage-gated sodium channels (TTX-blockable) are vital for action potentials in excitable cells.
  • Previous research identified these channels in limited non-cultured and cultured ocular epithelial cells.

Purpose of the Study:

  • To investigate the presence and characteristics of sodium currents in non-cultured and cultured ocular epithelial cells.
  • To expand the understanding of sodium channel distribution in ocular tissues.

Main Methods:

  • Electrophysiological recordings (current/voltage relationships) were performed on freshly dissociated and cultured ocular epithelial cells.
  • Pharmacological analysis using tetrodotoxin (TTX) and quinidine, along with ion substitution experiments (Na+ with Cs+ or K+).

Main Results:

  • Sodium currents, consistent with voltage-gated sodium channels, were identified in non-cultured rabbit corneal endothelium and frog lens epithelium.
  • These currents were also found in six additional cultured ocular epithelial cell types across three species.
  • The observed currents were sensitive to TTX and quinidine and were dependent on extracellular sodium ions.

Conclusions:

  • This study demonstrates the presence of functional voltage-gated sodium channels in previously uncharacterized non-cultured ocular epithelial cell types.
  • The findings suggest a broader role for sodium channels in ocular epithelial transport and function than previously recognized.

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