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Galpha12/13 is essential for directed cell migration and localized Rho-Dia1 function.

Polyxeni Goulimari1, Thomas M Kitzing, Helga Knieling

  • 1Institute of Pharmacology, University of Heidelberg, Im Neuenheimer Feld 366, 69120 Heidelberg, Germany.

The Journal of Biological Chemistry
|October 28, 2005
PubMed
Summary

Galpha12/13 proteins are essential for directed cell migration during wound healing. They link external signals to Rho-Dia1 function, enabling coordinated cell movement and microtubule stabilization.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Directed cell migration is crucial for embryogenesis, invasion, and tissue repair.
  • The role of trimeric G-proteins in cell migration during wound healing remains largely unknown.

Purpose of the Study:

  • To investigate the function of G-protein alpha subunits (Galpha12/13, Galphaq/11, Galphai) in directed cell migration.
  • To elucidate the molecular mechanisms by which Galpha12/13 influences cell migration during wound healing.

Main Methods:

  • Scratch-wound assays were performed using mouse embryonic fibroblasts.
  • Rho activity was assessed in migrating cells.
  • Localization of Rho and diaphanous-related formin Dia1 was analyzed.
  • Microtubule stability was evaluated in Galpha12/13-deficient cells and following Dia1 knockdown.

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Main Results:

  • Galpha12/13, but not Galphaq/11 or Galphai, is indispensable for coordinated and directed cell migration.
  • Galpha12/13 deficiency abolishes Rho activity at the cell front during migration.
  • Active Rho colocalizes with Dia1 at the leading edge, and Galpha12/13-deficient cells lack Dia1 localization and stable microtubules.
  • Dia1 knockdown impairs microtubule stabilization and polarized cell migration.

Conclusions:

  • Galpha12/13 proteins are essential for directed cell migration.
  • Galpha12/13 links extracellular signals to localized Rho-Dia1 function, which is critical for microtubule organization and cell polarization during wound healing.