Insights Into the Molecular Mechanism of Chronic Fibrosis: The Role of Connective Tissue Growth Factor in Scleroderma  Andrew Leask, Christopher P. Denton,

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Insights Into the Molecular Mechanism of Chronic Fibrosis: The Role of Connective Tissue Growth Factor in Scleroderma  Andrew Leask, Christopher P. Denton, David J. Abraham  Journal of Investigative Dermatology  Volume 122, Issue 1, Pages 1-6 (January 2004) DOI: 10.1046/j.0022-202X.2003.22133.x Copyright © 2003 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 The regulation of CTGF in normal and scleroderma fibroblasts. A diagram of the CTGF promoter is shown, with the elements that are required for the expression of CTGF in normal and scleroderma fibroblasts. The expression of CTGF in normal fibroblasts requires induction by TGF-β and its TGF-β response element, namely Smad and TEF recognition sequences (circles with stippled and vertical lines, respectively;Holmes et al, 2001;Leask et al, 2003). The expression of CTGF in scleroderma fibroblasts requires an Sp1-binding element (open box;Holmes et al, 2003) and is independent of the TGF-β response element of the CTGF promoter. Journal of Investigative Dermatology 2004 122, 1-6DOI: (10.1046/j.0022-202X.2003.22133.x) Copyright © 2003 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Model of sustained, chronic fibrosis. TGF-β is necessary for the initiation of the normal wound healing response, including the expression of ECM and CTGF in dermal fibroblasts. In the normal wound healing response, the action of TGF-β, including the induction of CTGF, is suppressed leading to the proper termination of the wound healing response (black arrow). Conversely in pathologic fibrosis, the expression of CTGF in the lesion is independent of TGF-β action. Thus CTGF expression is not subject to controls that normally terminate the wound healing response. The fibrotic response persists, leading to sustained, chronic fibrosis (gray arrow). The phases of the normal wound healing and fibrotic response are shown, and the effectors of the fibrotic response are shown at the top of the diagram. Journal of Investigative Dermatology 2004 122, 1-6DOI: (10.1046/j.0022-202X.2003.22133.x) Copyright © 2003 The Society for Investigative Dermatology, Inc Terms and Conditions