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Integrin-linked kinase interactions with ELMO2 modulate cell polarity

Ernest Ho1, Tames Irvine, Gregory J A Vilk

  • 1Department of Physiology and Pharmacology, Child Health Research Institute and Lawson Health Research Institute, University of Western Ontario, London, ON, Canada.

Molecular Biology of the Cell
|May 15, 2009
PubMed

Insights

A newly discovered Integrin-linked kinase (ILK) complex with ELMO2 and RhoG is crucial for cell polarization and directed migration. This finding advances understanding of tissue development and repair.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Cell polarization is vital for directed cell migration in development, regeneration, and metastasis.
  • Integrin-linked kinase (ILK) is essential for cell polarization, but its precise role in normal epithelia is unclear.

Purpose of the Study:

  • To elucidate the mechanisms by which ILK modulates cell polarization in normal epithelia.
  • To identify novel protein complexes involving ILK in cell polarization.

Main Methods:

  • Identification and characterization of a novel ILK protein complex.
  • Demonstration of RhoG presence within ILK-ELMO2 complexes.
  • Localization studies of the multiprotein complex in polarized cells.

Main Results:

  • A novel ILK complex containing Engulfment and Cell Motility 2 (ELMO2) and RhoG was identified.
  • This complex localizes to the leading lamellipodia of polarized cells.
  • RhoG binding to ELMO is critical for ILK-induced cell polarization; ILK and ELMO2 synergistically promote polarity and migration.

Conclusions:

  • The RhoG-ELMO2-ILK complex is essential for establishing cell polarity and directed migration.
  • ILK's ability to induce front-rear cell polarity is dependent on its interaction with ELMO2 and RhoG.

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