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CTGF
CTGF, also known as CCN2 or connective tissue growth factor, is a matricellular protein of the CCN family of extracellular matrix-associated heparin-binding proteins (see also CCN intercellular signaling protein). CTGF has important roles in many biological processes, including cell adhesion, migration, proliferation, angiogenesis, skeletal development, and tissue wound repair, and is critically involved in fibrotic disease and several forms of cancers.〔〔
== Structure and binding partners ==
Members of the CCN protein family, including CTGF, are structurally characterized by having four conserved, cysteine-rich domains. These domains are, from N- to C-termini, the insulin-like growth factor binding protein (IGFBP) domain, the von Willebrand type C repeats (vWC) domain, the thrombospondin type 1 repeat (TSR) domain, and a C-terminal domain (CT) with a cysteine knot motif. CTGF exerts its functions by binding to various cell surface receptors in a context-dependent manner, including integrin receptors, cell surface heparan sulfate proteoglycans (HSPGs), LRPs, and TrkA. In addition, CTGF also binds growth factors and extracellular matrix proteins. The N-terminal half of CTGF interacts with aggrecan, the TSR domain interacts with VEGF, and the CT domain interacts with members of the TGF-β superfamily, fibronectin, perlecan, fibulin-1, slit, and mucins.〔〔
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