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EphA receptors regulate prostate cancer cell dissemination through Vav2-RhoA mediated cell-cell repulsion

Jennifer Batson1, Lucy Maccarthy-Morrogh2, Amy Archer1

  • 1School of Physiology and Pharmacology, University of Bristol, Bristol BS8 1TD, UK.

Biology Open
|May 6, 2014
PubMed

Insights

Prostate cancer cells use EphA receptors to repel each other, a process involving Vav2 and RhoA. This cell-cell repulsion, regulated by microtubules, may drive invasion away from the primary tumor.

Area of Science:

  • Oncology
  • Cell Biology
  • Biochemistry

Background:

  • Metastatic prostate cancer cells exhibit complex social interactions, with EphB receptors mediating attraction to stromal fibroblasts and EphA receptors mediating repulsion between cancer cells.
  • The downstream signaling pathways and functional impact of these Eph receptor-mediated cell-cell interactions during cancer invasion remain poorly understood.

Purpose of the Study:

  • To investigate the role of EphA receptors in regulating prostate cancer cell dissemination.
  • To elucidate the signaling mechanisms downstream of EphA receptors involved in cancer cell-cell repulsion.

Main Methods:

  • Utilized 2D dispersal and 3D spheroid assays to assess prostate cancer cell dissemination.
  • Employed siRNA technology to knockdown EphA receptors, Vav2, and RhoA.
  • Investigated the effect of microtubule destabilization on cell-cell repulsion.

Main Results:

  • EphA receptors were found to regulate prostate cancer cell dissemination in both 2D and 3D models.
  • EphA receptor signaling activates RhoA via the exchange factor Vav2, which is essential for cancer cell-cell repulsion.
  • Partial microtubule destabilization restored contact-mediated repulsion in cells with reduced EphA2/EphA4, Vav2, or RhoA expression.

Conclusions:

  • EphA receptor-Vav2-RhoA signaling mediates repulsion between prostate cancer cells.
  • This repulsion mechanism, influenced by microtubule dynamics, may contribute to local invasion by promoting cell dissemination away from the primary tumor.
Keywords:
Cell migrationContact inhibition of locomotionEph receptorsProstate cancerRho GTPasesVav2

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