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Phospholipase Cgamma2 modulates integrin signaling in the osteoclast by affecting the localization and activation of

Holly Epple1, Viviana Cremasco, Kaihua Zhang

  • 1Washington University School of Medicine, Department of Medicine, 660 South Euclid, St. Louis, MO 63110, USA.

Molecular and Cellular Biology
|April 2, 2008
PubMed

Insights

Phospholipase C gamma 2 (PLCgamma2) is crucial for osteoclast Src activation and integrin-mediated functions. Its absence impairs cell adhesion, migration, and bone resorption by disrupting Src localization and signaling.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Integrin engagement triggers signaling pathways, including tyrosine phosphorylation, affecting the actin cytoskeleton.
  • Src is a key mediator of integrin-dependent functions, but its regulation by integrin signals is not fully understood.

Purpose of the Study:

  • To investigate the role of phospholipase C gamma 2 (PLCgamma2) in Src activation within osteoclasts.
  • To elucidate the mechanism by which PLCgamma2 regulates integrin-mediated functions in osteoclasts.

Main Methods:

  • Analysis of primary cells from PLCgamma2 knockout mice.
  • Assessment of alpha(v)beta(3) integrin-mediated osteoclast adhesion, migration, and bone resorption.
  • Examination of PYK2 and Src phosphorylation levels.
  • Investigation of Src interaction with beta(3) integrin and PYK2.
  • Evaluation of Src localization to the actin ring.

Main Results:

  • PLCgamma2 is essential for alpha(v)beta(3) integrin-mediated osteoclast adhesion, migration, and bone resorption.
  • Absence of PLCgamma2 significantly reduces adhesion-induced PYK2 and Src phosphorylation.
  • PLCgamma2 deficiency dramatically decreases the interaction of Src with beta(3) integrin and PYK2.
  • PLCgamma2 is required for the proper localization of Src to the sealing actin ring, dependent on its catalytic and adapter domains.

Conclusions:

  • PLCgamma2 plays a critical role in regulating Src activation in osteoclasts.
  • PLCgamma2 influences Src activation by mediating its localization to the integrin complex.
  • These findings highlight PLCgamma2 as a key regulator of integrin-mediated osteoclast functions.

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