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• W2162838387 abstract "The cytokine transforming growth factor β1 (TGF-β1) is secreted in a latent form that has no known biological activity. The conversion of latent TGF-β1 into its biologically active 25kDa form is thought to be an important step in the regulation of TGF-β activity both in cell culture and in vivo. Thrombospondin (TSP)-1, a 360kDa platelet α-granule and extracellular matrix protein, has been shown to participate in TGF-β1 activation. We have used a chemically defined system to examine the mechanism of TSP-1-mediated TGF-β1 activation. However, the addition of two different preparations of TSP-1 to recombinant small latent TGF-β1 in the test tube resulted in only a very small increase in the proportion of the TGF-β1 able to bind to the TGF-β type II receptor: from 0.1% to a maximum of 0.4%. This small effect was not specific for TSP-1: matrix metalloproteinase 2, tissue inhibitor of matrix metalloproteinase 2 and active plasminogen activator inhibitor 1, but not transglutaminase, human serum albumin or immunoglobulin, had quantitatively similar effects on latent TGF-β1. Furthermore, no change in the activity associated with small latent TGF-β1 was noted in either mink lung epithelial cell or rat aortic smooth-muscle cell culture systems in the presence of TSP-1 (or TSP-1-derived peptides). We conclude that TSP-1, either alone or in the presence of cultured smooth-muscle cells (a cell type known to activate latent TGF-β in vitro and in vivo) is unable to activate latent TGF-β1. Any TSP-mediated activation of TGF-β1 must depend on additional factor(s) not present in our systems." @default.
• W2162838387 created "2016-06-24" @default.
• W2162838387 creator A5059795686 @default.
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• W2162838387 date "2000-08-09" @default.
• W2162838387 modified "2023-10-11" @default.
• W2162838387 title "Thrombospondin 1 does not activate transforming growth factor β1 in a chemically defined system or in smooth-muscle-cell cultures" @default.
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• W2162838387 doi "https://doi.org/10.1042/bj3500291" @default.
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