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Revisiting the ERK/Src cortactin switch.

Laura C Kelley1, Karen E Hayes, Amanda Gatesman Ammer

  • 1Department of Neurobiology and Anatomy; Program in Cancer Cell Biology; Mary Babb Randolph Cancer Center; West Virginia University, Morgantown, WV USA.

Communicative & Integrative Biology
|June 10, 2011
PubMed
Summary
This summary is machine-generated.

Cortactin phosphorylation by ERK1/2 and Src kinases regulates tumor cell invasion. New antibodies reveal cortactin can be co-phosphorylated, suggesting complex regulation beyond a simple ERK/Src switch.

Keywords:
ERK1/2N-WASpSrccortactininvasionmotilityphosphorylation

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Cortactin regulates actin networks crucial for tumor cell movement and invasion.
  • Cortactin is phosphorylated by ERK1/2 (activating) and Src kinases (inhibiting), forming a regulatory switch.
  • Previous studies lacked tools to study this switch in cellular contexts.

Purpose of the Study:

  • To investigate the in vivo regulation of cortactin by ERK1/2 and Src kinases.
  • To develop and utilize phosphorylation-specific antibodies for studying cortactin regulation.
  • To determine if the proposed ERK/Src switch is the sole regulatory mechanism.

Main Methods:

  • Development of phosphorylation-specific antibodies for ERK1/2 sites (pS405, pS418) on cortactin.
  • Utilizing these antibodies to analyze cortactin phosphorylation in cellular systems.
  • Co-immunoprecipitation and Western blotting to detect phosphorylation events.

Main Results:

  • Cortactin is indeed co-phosphorylated at ERK1/2 sites (pS405/pS418) and Src-targeted tyrosine residues.
  • These findings were validated using the newly developed phosphorylation-specific antibodies.
  • The results challenge the notion of a simple, exclusive ERK/Src switch model.

Conclusions:

  • The ERK/Src cortactin switch is not the only mechanism regulating cortactin function.
  • Cortactin phosphorylation is more complex, involving co-regulation by multiple kinase pathways.
  • This study provides new tools and insights into cortactin's role in cancer progression.