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Connexins induce and maintain tight junctions in epithelial cells.

Takashi Kojima1, Masaki Murata, Mitsuru Go

  • 1Department of Pathology, Sapporo Medical University School of Medicine, Sapporo, Japan. ktakashi@sapmed.ac.jp

The Journal of Membrane Biology
|June 15, 2007
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Summary

Connexins (Cx) are key for epithelial cell differentiation and tight junction formation. This review highlights how Cx32 and Cx26 influence tight junction expression and function in hepatic and airway cells, sometimes independently of intercellular communication.

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Area of Science:

  • Cell Biology
  • Epithelial Biology
  • Molecular Biology

Background:

  • Connexins (Cx) are implicated in epithelial cell differentiation and junctional complex formation.
  • Their specific roles in inducing and maintaining tight junctions (TJs) in various epithelial cell types require further elucidation.

Purpose of the Study:

  • To investigate the mechanisms by which connexins (Cx32 and Cx26) influence the expression and function of tight junctions in hepatic and airway epithelial cells.
  • To determine whether connexin-mediated intercellular communication is essential for these effects.

Main Methods:

  • Utilized gene transfection to introduce human Cx32 and Cx26 into relevant cell models (Cx32-deficient mouse hepatic cells and Calu-3 airway cells).
  • Assessed tight junction protein expression, localization, and function.
  • Employed ouabain to disrupt tight junctions in airway epithelial cells to test Cx26's protective role.
  • Differentiated between gap junctional intercellular communication (GJIC)-dependent and -independent mechanisms.

Main Results:

  • Cx32 expression and GJIC induced TJ expression and function in hepatic cells, also promoting cell polarity.
  • Exogenous Cx32 expression led to MAGI-1 expression independently of GJIC.
  • Cx26 expression, independent of GJIC, enhanced TJ expression and function in airway cells.
  • Cx26 transfection protected airway epithelial cells against ouabain-induced TJ disruption.

Conclusions:

  • Connexins can induce and maintain tight junctions in epithelial cells through both GJIC-dependent and -independent pathways.
  • Specific connexin isoforms (Cx32 and Cx26) exhibit distinct roles in regulating TJ integrity and function in different epithelial contexts.