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Related Experiment Videos

Src-dependent ezrin phosphorylation in adhesion-mediated signaling.

J Srivastava1, B E Elliott, D Louvard

  • 1Morphogenèse et Signalisation Cellulaires, UMR144 CNRS-Institut Curie, 75248 Paris Cedex 05, France.

Molecular Biology of the Cell
|January 14, 2005
PubMed
Summary

Ezrin phosphorylation at Y145 by Src is crucial for epithelial cell spreading and proliferation. This study reveals how Src-mediated ezrin phosphorylation regulates cell adhesion and signaling pathways.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Ezrin is a protein linking the cell membrane to the actin cytoskeleton and is involved in signal transduction.
  • Cell spreading and adhesion are critical processes regulated by complex signaling networks.

Purpose of the Study:

  • To investigate the role of ezrin phosphorylation at tyrosine 145 (Y145) in epithelial cell spreading and proliferation.
  • To elucidate the mechanism by which Src kinase mediates ezrin phosphorylation and its downstream effects.

Main Methods:

  • Expression of ezrin Y145F mutant in epithelial cells.
  • Analysis of cell spreading on fibronectin.
  • Rescue experiments using catalytically functional Src.
  • Phosphorylation studies in A431 and SYF-/- fibroblasts.

Related Experiment Videos

  • Investigation of Src SH2 domain binding to ezrin.

    • Main Results:

    • Ezrin Y145F mutant expression delayed epithelial cell spreading by inhibiting focal adhesion kinase (FAK) activation.
    • Overexpression of active Src rescued the spreading defect.
    • Ezrin Y145 phosphorylation was observed in EGF-stimulated A431 cells and v-Src-transformed cells.
    • Src-dependent ezrin Y145 phosphorylation required Src SH2 domain binding to ezrin.
    • Cells expressing ezrin Y145F showed impaired proliferation in 3D collagen gels.

    Conclusions:

    • Src-dependent phosphorylation of ezrin at Y145 is a key signaling event regulating adhesion-mediated processes in epithelial cells.
    • This phosphorylation event is essential for normal epithelial cell spreading, FAK activation, and proliferation.
    • A positive feedback mechanism involving Src activity, ezrin binding, and Y145 phosphorylation is suggested.