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Section of Rheumatology, Department of Medicine, University of Illinois, Chicago, Illinois 60607
Type I collagen, the major component of extracellular matrix in skin and other tissues, is a heterotrimer of two 
1 and one 2 collagen polypeptides. The synthesis of both chains is highly regulated by different cytokines at the transcriptional level. Excessive synthesis and deposition of collagen in the dermal region causes thick and hard skin, a clinical manifestation of scleroderma. To better understand the causes of scleroderma or other tissue fibrosis, it is very important to investigate the molecular mechanisms that cause upregulation of the Type I collagen synthesis in these tissues. Several cis-acting regulatory elements and trans-acting protein factors, which are involved in basal as well as cytokine-modulated Type I collagen gene expression, have been identified and characterized. Hypertranscription of Type I collagen in scleroderma skin fibroblasts may be due to abnormal activities of different positive or negative transcription factors in response to different abnormally induced signaling pathways. In this review, I discuss the present day understanding about the involvement of different factors in the regulation of basal as well as cytokine-modulated Type I collagen gene expression and its implication in scleroderma research.
Key Words: extracellular matrix • type I collagen • transcription factors • transcriptional coactivators p300/CBP • TGF-ß • IFN-
• TNF- • IL-1ß • signal transduction • scleroderma
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