Abstract
We have previously isolated a human gene from an endothelial cell cDNA library encoding a putative tyrosine kinase; we have designated this gene the fms-like gene (FLG). To analyze the gene product(s) of FLG, we have generated rabbit polyclonal antibodies directed against a synthetic peptide from FLG and used it to immunoprecipitate biosynthetically labeled FLG protein from a variety of human cell lines. These antibodies specifically recognized glycoprotein(s) of 100, 120, and 135 kDa with protein cores of 90 and 110 kDa. Acidic fibroblast growth factor (aFGF) stimulated tyrosine kinase activity of FLG in vitro and in living cells, suggesting that FLG encodes the membrane receptor for aFGF. Further supporting evidence came from cross-linking experiments on intact cells with the covalent cross-linking agent disuccinimidyl suberate and 125I-labeled aFGF as a specific probe. The cross-linked 125I-labeled aFGF-aFGF receptor complex was specifically immunoprecipitated with FLG antipeptide antibodies. It appears, therefore, that the receptor(s) for aFGF is related to the FLG gene product.
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