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    Nat Genet. 2007 Nov;39(11):1376-83. Epub 2007 Sep 30.

    EphB-ephrin-B interactions suppress colorectal cancer progression by compartmentalizing tumor cells.

    Source

    Oncology Programme, Institute for Research in Biomedicine (IRB), Josep Samitier 1-5, 08028 Barcelona. Spain.

    Abstract

    The genes encoding tyrosine kinase receptors EphB2 and EphB3 are beta-catenin and Tcf4 target genes in colorectal cancer (CRC) and in normal intestinal cells. In the intestinal epithelium, EphB signaling controls the positioning of cell types along the crypt-villus axis. In CRC, EphB activity suppresses tumor progression beyond the earliest stages. Here we show that EphB receptors compartmentalize the expansion of CRC cells through a mechanism dependent on E-cadherin-mediated adhesion. We demonstrate that EphB-mediated compartmentalization restricts the spreading of EphB-expressing tumor cells into ephrin-B1-positive territories in vitro and in vivo. Our results indicate that CRC cells must silence EphB expression to avoid repulsive interactions imposed by normal ephrin-B1-expressing intestinal cells at the onset of tumorigenesis.

    PMID:
    17906625
    [PubMed - indexed for MEDLINE]

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