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Gap junctional coupling in lenses lacking alpha3 connexin

X Gong1, G J Baldo, N M Kumar

  • 1Department of Cell Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

Proceedings of the National Academy of Sciences of the United States of America
|December 23, 1998
PubMed
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Alpha-3 connexin (Cx46) is crucial for maintaining lens homeostasis. Its absence leads to uncoupled mature fiber cells, depolarization, and opacity, highlighting its essential role in lens function.

Area of Science:

  • Ophthalmology
  • Cell Biology
  • Biophysics

Background:

  • Lens fiber cells utilize gap junctions composed of alpha3 (Cx46) and alpha8 (Cx50) connexins.
  • The specific function of these connexins in maintaining lens homeostasis remains unclear.

Purpose of the Study:

  • To investigate the role of alpha3 connexin in lens cell-to-cell coupling and homeostasis.
  • To determine the contribution of alpha3 connexin to lens function using knockout mouse models.

Main Methods:

  • Impedance techniques were employed to measure cell-to-cell coupling in mouse lenses.
  • Western blots and immunofluorescence assays assessed connexin expression levels.
  • Analysis included homozygous alpha3 knockout, heterozygous, and wild-type mouse lenses.

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Main Results:

  • Alpha3 connexin was absent in knockout (-/-) and reduced in heterozygous (+/-) lenses, while alpha8 levels remained consistent.
  • A significant cleavage of connexins was observed in wild-type lenses, correlating with altered coupling conductance.
  • Alpha3 knockout lenses exhibited zero coupling conductance in mature fibers, leading to depolarization and opacity, while differentiating fibers showed reduced but pH-sensitive coupling.

Conclusions:

  • Alpha3 connexin is essential for coupling mature fiber cells to peripheral cells in the lens.
  • This coupling is vital for maintaining fiber cell homeostasis, as its disruption causes depolarization and opacity.