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• W2567401549 abstract "Gremlin-1, a bone morphogenetic protein (BMP) antagonist, has essential roles in kidney and limb bone development, and is important in chronic diseases including tissue fibrosis. It also functions as an activating ligand of the vascular endothelial growth factor (VEGF) receptor 2 (VEGFR2), and binds strongly to the sulfated polysaccharide, heparin. Here we investigated the extent to which gremlin binds to the related polysaccharide heparan sulfate (HS), which unlike heparin is widely distributed spread within tissues. We determined that both highly sulfated HS and kidney HS are able to partially compete for the binding of heparin to gremlin, whereas low sulfated HS is a poor competitor. In further investigations of the interaction between gremlin and HS, we found that wild-type gremlin is able to bind broadly across the various regions of kidney in an HS-dependent manner, with particularly intense binding to tubular structures in the renal cortex. In a model of chronic kidney disease, fibrotic changes in the kidney result in a loss of gremlin binding sites. Gremlin mutants with reduced affinity for heparin showed negligible binding under the same conditions. These mutants nonetheless remain functional as BMP antagonists on C2C12 myoblastic cells transfected with a Smad 1 reporter gene construct. Overall our findings indicate that on secretion, gremlin will bind to HS structures on the cell surface and in the extracellular matrix, thus providing for a localised reservoir which can modulate BMP activity in a temporospatially restricted manner. Although binding of heparin/HS to gremlin has been shown elsewhere to be necessary for gremlin activation of VEGFR2, this does not appear to be essential for BMP antagonism by gremlin. Thus these sulfated polysaccharides differentially regulate the activities of gremlin." @default.
• W2567401549 created "2017-01-06" @default.
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• W2567401549 date "2017-02-01" @default.
• W2567401549 modified "2023-09-27" @default.
• W2567401549 title "The binding of the bone morphogenetic protein antagonist gremlin to kidney heparan sulfate: Such binding is not essential for BMP antagonism" @default.
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• W2567401549 doi "https://doi.org/10.1016/j.biocel.2016.12.006" @default.
• W2567401549 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27979781" @default.
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