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Dissociation of EphB2 signaling pathways mediating progenitor cell proliferation and tumor suppression

Maria Genander1, Michael M Halford, Nan-Jie Xu

  • 1Department of Cell and Molecular Biology, Karolinska Institute, SE-171 77 Stockholm, Sweden.

Cell
|November 17, 2009
PubMed

Insights

EphB2 receptor signaling in the intestine has dual roles. Its kinase-independent function controls cell positioning, while its kinase activity regulates proliferation, offering a strategy to target adenoma growth.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Oncology

Background:

  • Proto-oncogenes typically drive cell proliferation, but EphB receptors are an exception.
  • EphB receptors promote intestinal cell proliferation and act as tumor suppressors by regulating cell migration and inhibiting invasive growth.

Purpose of the Study:

  • To investigate the independent roles of EphB2 receptor in controlling cell migration and proliferation.
  • To elucidate the molecular pathways involved in EphB2-mediated signaling in the intestinal epithelium.

Main Methods:

  • Investigated EphB2 signaling pathways in intestinal epithelial cells.
  • Utilized molecular and cellular biology techniques to dissect kinase-dependent and -independent signaling.
  • Analyzed changes in EphB2 signaling during the progression of human colon adenoma to carcinoma.

Main Results:

  • EphB2 receptor controls cell positioning via a kinase-independent pathway involving phosphatidylinositol 3-kinase.
  • EphB2 tyrosine kinase activity regulates cell proliferation through an Abl-cyclin D1 pathway.
  • Cyclin D1 regulation dissociates from EphB signaling in human colon carcinoma, enabling continued proliferation and invasive growth.

Conclusions:

  • EphB2 signaling pathways controlling cell migration and proliferation are independently regulated.
  • The dissociation of these pathways during colon cancer progression offers a therapeutic target.
  • Selective inhibition of EphB2's mitogenic effect, without compromising its tumor suppressor function, presents a pharmacological strategy for adenoma growth suppression.

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