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Tumor Biology |
Friedrich Miescher Institute for Biomedical Research, 4058 Basel, Switzerland [W. H., R. C-E., G. O.], and Departamento Inmunologia, Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Cientificas, 28006 Madrid, Spain [J. V. M., A. G-P.]
Tenascin-C is an adhesion-modulatory extracellular matrix molecule that is highly expressed in tumors. To investigate the effect of tenascin-C on tumor cells, we analyzed its antiadhesive nature and effect on tumor cell proliferation in a fibronectin context. Glioblastoma and breast carcinoma cell adhesion was compromised by a mixed fibronectin/tenascin-C substratum, which concomitantly caused increased tumor-cell proliferation. We identified the antiadhesive mechanism as a specific interference of tenascin-C with cell binding to the HepII/syndecan-4 site in fibronectin through direct binding of tenascin-C to the 13th fibronectin type III repeat (FNIII13). Cell adhesion and proliferation levels were restored by the addition of FNIII13. Overexpression of syndecan-4, but not syndecan-1 or -2, reverted the cell adhesion defect of tenascin-C. We characterized FNIII13 as the binding site for syndecan-4. Thus we describe a novel mechanism by which tenascin-C impairs the adhesive function of fibronectin through binding to FNIII13, thereby inhibiting the coreceptor function of syndecan-4 in fibronectin-induced integrin signaling.
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