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Inhibition of cell migration and invasion mediated by the TAT-RasGAP317-326 peptide requires the DLC1 tumor

D Barras1, G Lorusso2, C Rüegg2

  • 1Department of Physiology, University of Lausanne, Lausanne, Switzerland.

Oncogene
|November 12, 2013
PubMed

Insights

The peptide TAT-RasGAP(317-326) enhances tumor cell death and also inhibits cancer cell migration and invasion. This peptide alters the actin cytoskeleton and focal adhesions, offering a dual-action therapeutic strategy.

Area of Science:

  • Oncology
  • Cell Biology
  • Biochemistry

Background:

  • The peptide TAT-RasGAP(317-326) is derived from p120 RasGAP and a cell-penetrating TAT peptide.
  • It is known to sensitize tumor cells to anticancer treatments, promoting cell death.

Purpose of the Study:

  • To investigate the effects of TAT-RasGAP(317-326) on cancer cell adhesion, migration, and invasion.
  • To elucidate the molecular mechanisms underlying these effects, particularly the role of cytoskeletal and adhesion proteins.

Main Methods:

  • Treatment of various tumor cells with TAT-RasGAP(317-326).
  • Assessment of cell adherence, migration, and invasion assays.
  • Analysis of actin cytoskeleton and focal adhesion dynamics.
  • Investigation of the involvement of integrins, Rho GTP-binding proteins, and deleted in liver cancer-1 (DLC1).

Main Results:

  • TAT-RasGAP(317-326) significantly increased cell adherence.
  • The peptide inhibited cell migration and matrix invasion.
  • These effects were associated with modifications in the actin cytoskeleton and focal adhesion distribution.
  • Pro-adhesive effects were independent of integrins and Rho GTP-binding proteins.
  • The tumor suppressor DLC1 was found to be essential for the pro-adhesive and anti-migratory actions of TAT-RasGAP(317-326).

Conclusions:

  • TAT-RasGAP(317-326) possesses dual functions: promoting tumor cell death and inhibiting cancer cell migration and invasion.
  • The peptide's anti-migratory and pro-adhesive effects are mediated through DLC1, independent of classical integrin and Rho GTPase pathways.
  • These findings highlight TAT-RasGAP(317-326) as a promising agent for cancer therapy with multifaceted mechanisms of action.

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