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PC Baciu and PF Goetinck
Cutaneous Biology Research Center, Massachusetts General Hospital, Harvard Medical School, Charlestown 02129, USA.
Cell surface heparan sulfate proteoglycans have been implicated as co- receptors facilitating cell adhesion and growth factor binding. Recent studies on the role of a family of transmembrane heparan sulfate proteoglycans, syndecans, in cell adhesion has identified one member, syndecan-4, to be present within focal contacts. The current study investigates the mechanisms regulating the association of syndecan-4 with focal contacts based upon its immunolocalization with vinculin in quiescent, serum-stimulated, and 12-0-tetradecanoylphorbol 13-acetate (TPA)-induced cultures. In quiescent cells, syndecan-4 did not localize to focal contacts. However, activation of protein kinase C by TPA or serum induces the active recruitment of syndecan-4 into focal contacts. This induction preferentially localizes syndecan-4 to focal contacts behind the leading lamella, the subnuclear region, and along the trailing edge of migratory cells. Focal contacts in either freshly adhered cells or in the leading lamellae of migrating cells did not stain for syndecan-4. In addition to the observed subcellular distribution and recruitment, syndecan-4 was observed to co-localize with endogenously synthesized fibronectin fibrils within focal contacts as well as with fibrils present in the matrix. These findings suggest that protein kinase C activation results in syndecan-4 recruitment to focal contacts and its association with sites of matrix deposition.
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