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Immunogen sequence: DDPGCLADYV EIYDSYDDVH GFVGRYCGDE LPDDIISTGN VMTLKFLSDA SVTAGGFQIK YVAMDPVSKS SQ
Highest antigen sequence identity to the following orthologs: Mouse - 93%, Rat - 90%.
The TSG6 gene is transcribed in normal fibroblasts and activated by binding of the cytokines TNF alpha and IL-1 at AP-1 and NF-IL6 sites in its promoter. TSG-6 is a glycoprotein and a member of the hyaluronan-binding protein family, which includes cartilage link protein, proteoglycan core protein and the adhesion receptor CD44. TSG-6 is highly homologous to CD44, particularly in the hyaluronic acid-binding domain. TSG-6 is found in TNF-treated cells; its expression is rapidly activated by TNF alpha, IL-1 and lipopolysaccharide in normal fibroblasts, peripheral blood mononuclear cells, synovial cells and chondrocytes. The presence of TSG-6 in synovial fluid suggests a possible role in rheumatoid arthritis. TSG-6 forms a stable complex with components of the serine protease inhibitor, inter-alpha-inhibitor (I alpha I)). TSG-6 potentiates the inhibitory effect of l alpha l on the protease activity of plasmin. Through their cooperative inhibitory effect on plasmin, TSG-6 and l alpha l can modulate the protease network and thus inhibit inflammation.
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