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Dual function of Src in the maintenance of adherens junctions during tracheal epithelial morphogenesis

Masayo Shindo1, Housei Wada, Masako Kaido

  • 1Riken Center for Developmental Biology, 2-2-3 Minatojima-minamimachi, Chuo-ku Kobe 650-0047, Japan.

Development (Cambridge, England)
|February 29, 2008
PubMed

Insights

Src kinase activity in Drosophila regulates epithelial integrity by modulating E-cadherin. This dual effect on E-cadherin levels and gene expression is crucial for cell adhesion dynamics during development.

Area of Science:

  • Cell Biology
  • Developmental Biology
  • Molecular Biology

Background:

  • Src tyrosine kinase is implicated in epithelial to mesenchymal transition and tumorigenesis through E-cadherin downregulation.
  • The precise roles of Src in developmental processes and cell adhesion dynamics remain incompletely understood.

Purpose of the Study:

  • To investigate the function of endogenous and activated Drosophila Src in tracheal epithelial development.
  • To elucidate the mechanisms by which Src influences adherens junctions and E-cadherin during morphogenesis.

Main Methods:

  • Studied endogenous and activated forms of Drosophila Src (Src42A and Src64B) in tracheal epithelial development.
  • Analyzed Src activation at adherens junctions during epithelial morphogenesis.
  • Investigated the effects of Src activation on E-cadherin protein levels and gene transcription via Armadillo and TCF pathways.

Main Results:

  • Src42A is selectively activated in adherens junctions during tracheal epithelial morphogenesis.
  • Src42A and Src64B are essential for tracheal development and increase adherens junction turnover rate.
  • Src42A activation paradoxically reduced E-cadherin protein but increased E-cadherin gene transcription through Armadillo/TCF, maintaining tissue integrity.

Conclusions:

  • Src plays a critical role in maintaining epithelial integrity by dynamically regulating adherens junctions.
  • The opposing effects of Src on E-cadherin (protein reduction and gene stimulation) facilitate efficient junctional exchange.
  • Src-mediated regulation of E-cadherin is crucial for tissue development and integrity under dynamic conditions.

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