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DLC1 interaction with α-catenin stabilizes adherens junctions and enhances DLC1 antioncogenic activity

Veenu Tripathi1, Nicholas C Popescu, Drazen B Zimonjic

  • 1Laboratory of Experimental Carcinogenesis, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, USA.

Molecular and Cellular Biology
|April 5, 2012
PubMed

Insights

Deleted in liver cancer 1 (DLC1) binds to alpha-catenin, stabilizing cell adhesion and suppressing tumors. This interaction is crucial for DLC1

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • The Deleted in liver cancer 1 (DLC1) gene encodes a RhoGAP protein crucial for regulating cytoskeleton and cell-cell adhesion.
  • Malignant transformation and metastasis are linked to altered cytoskeletal organization and cell adhesion.
  • Adherens junctions (AJs) are vital protein complexes mediating cell-cell adhesion and actin cytoskeleton linkage.

Purpose of the Study:

  • To investigate the interaction between DLC1 and alpha-catenin in human cells.
  • To elucidate the functional consequences of DLC1-alpha-catenin binding on adherens junction stability and tumor suppression.

Main Methods:

  • Co-immunoprecipitation and colocalization studies to identify and visualize DLC1-alpha-catenin interaction.
  • DLC1 GAP activity assays and Rho GTPase level measurements.
  • Alpha-catenin knockdown experiments in human cells.
  • Analysis of E-cadherin mobility and actin organization.

Main Results:

  • Alpha-catenin was identified as a novel binding partner of DLC1, with specific amino acid regions mediating their interaction.
  • DLC1 and alpha-catenin colocalized at the plasma membrane, associating with E-cadherin and beta-catenin.
  • DLC1 binding to alpha-catenin enhanced AJ stability by reducing Rho GTP levels, increasing E-cadherin mobility, and organizing the actin cytoskeleton.
  • DLC1's oncosuppressive function in metastatic prostate carcinoma cells was significantly influenced by this interaction.

Conclusions:

  • DLC1 exerts its tumor-suppressive function through a novel mechanism involving direct interaction with alpha-catenin.
  • The DLC1-alpha-catenin complex stabilizes adherens junctions, impacting cytoskeletal organization and cell adhesion.
  • This finding provides new insights into the role of DLC1 in cancer progression and metastasis.

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