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  • Title: Polysialylated NCAM represses E-cadherin-mediated cell-cell adhesion in pancreatic tumor cells.
    Author: Schreiber SC, Giehl K, Kastilan C, Hasel C, Mühlenhoff M, Adler G, Wedlich D, Menke A.
    Journal: Gastroenterology; 2008 May; 134(5):1555-66. PubMed ID: 18384787.
    Abstract:
    BACKGROUND & AIMS: Inhibition of cell-cell adhesion between epithelial cells represents an early step during tumor metastasis. Down-regulation or perturbation of E-cadherin-mediated adherens junctions is an essential requirement in this process. METHODS: The interaction between polysialylated neural cell adhesion molecule (PSA-NCAM) and the E-cadherin adhesion complex was studied by coimmunoprecipitation assays. The presence of PSA-NCAM was correlated with tumor invasion by using cell-cell aggregation and cell migration assays. The importance of polysialic acid (PSA) in the interaction of NCAM with E-cadherin and inhibition of cell-cell adhesion was confirmed by enzymatic removal of PSA from NCAM and down-regulation of PSA-transferases by siRNA. RESULTS: Expression of oncogenic K-Ras(V12) in pancreatic carcinoma cells resulted in induction of PSA-NCAM expression and reduced E-cadherin-mediated cellular adhesion. The association of PSA-NCAM with the E-cadherin adhesion complex correlated with decreased cell-cell aggregation and elevated cell migration of pancreatic carcinoma cells. Enzymatic removal of PSA from NCAM or reduction of polysialyltransferase expression led to reduced association between NCAM and E-cadherin and subsequently increased E-cadherin-mediated cell-cell aggregation and reduced cell migration. CONCLUSIONS: Our data suggest the induction of PSA-NCAM by oncogenic K-Ras as a novel molecular mechanism by which E-cadherin-mediated cellular adhesion is reduced and dissemination of tumor cells is facilitated.
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