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Cbl associates with Pyk2 and Src to regulate Src kinase activity, alpha(v)beta(3) integrin-mediated signaling, cell

A Sanjay1, A Houghton, L Neff

  • 1Department of Cell Biology and Orthopedics, Yale University School of Medicine, New Haven, Connecticut 06510, USA.

The Journal of Cell Biology
|January 10, 2001
PubMed

Insights

A newly identified molecular complex involving Src, Pyk2, and Cbl regulates cell adhesion and motility. This complex, activated by integrin alpha(v)beta(3), controls cell migration and adhesion, potentially explaining certain bone disorder phenotypes.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Integrin signaling pathways governing cell attachment and movement are not fully elucidated.
  • Understanding these pathways is crucial for various biological processes, including bone development and disease.

Purpose of the Study:

  • To investigate the molecular mechanisms regulating cell adhesion and motility downstream of integrin activation.
  • To identify key protein complexes involved in integrin-mediated signaling.

Main Methods:

  • Utilized osteoclasts and transfected 293 cells.
  • Investigated protein-protein interactions using co-immunoprecipitation and kinase assays.
  • Analyzed the role of specific proteins (Src, Pyk2, Cbl) in cell migration using gene deletion studies.

Main Results:

  • Identified a molecular complex of Src, Pyk2, and Cbl that regulates cell adhesion and motility.
  • Demonstrated that integrin alpha(v)beta(3) activation triggers a cascade involving Pyk2 phosphorylation, Src activation, and Cbl recruitment.
  • Showed that Cbl binding to Src inhibits Src kinase activity, impacting integrin-mediated adhesion and osteoclast migration.

Conclusions:

  • The Pyk2/Src/Cbl complex is a key regulator of integrin-mediated cell adhesion and migration.
  • Cbl acts as a critical inhibitor of Src kinase activity within this complex.
  • These findings offer insights into the molecular basis of osteopetrosis observed in Src-deficient mice.

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