FUNCTION Cell surface proteoglycan that contains both heparan sulfate and chondroitin sulfate and that links the cytoskeleton to the interstitial matrix (By similarity). Regulates exosome biogenesis in concert with SDCBP and PDCD6IP (PubMed:22660413). Able to induce its own expression in dental mesenchymal cells and also in the neighboring dental epithelial cells via an MSX1-mediated pathway (By similarity).SUBUNIT Interacts with CDCP1. Interacts (via C-terminus) with TIAM1 (via PDZ domain). Interacts with MDK (By similarity).INTERACTION Shedding of the ectodomain produces a soluble form.TISSUE SPECIFICITY Detected in placenta (at protein level) (PubMed:32337544). Detected in fibroblasts (at protein level) (PubMed:36213313).PTM Shedding is enhanced by a number of factors such as heparanase, thrombin or EGF. Also by stress and wound healing. PMA-mediated shedding is inhibited by TIMP3.SIMILARITY Belongs to the syndecan proteoglycan family.
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