A tyrosinated peptide representing the alternatively spliced exon of the platelet-derived growth factor A-chain binds specifically to cultured cells and interferes with binding of several growth factors - PubMed (original) (raw)
. 1992 Jan 25;267(3):1660-6.
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- PMID: 1309790
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A tyrosinated peptide representing the alternatively spliced exon of the platelet-derived growth factor A-chain binds specifically to cultured cells and interferes with binding of several growth factors
L M Khachigian et al. J Biol Chem. 1992.
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- J Biol Chem 1992 Mar 25;267(9):6449
Abstract
Platelet-derived growth factor (PDGF) is a potent mitogen for cells of mesenchymal origin. Alternative exon splicing is responsible for two forms of the PDGF A-chain which differ at the carboxyl terminus by a highly basic region consisting of 18 amino acids. To clarify the function of the region, we synthesized an octadecapeptide corresponding to this extension (A194-211), incorporated a tyrosine residue at the amino terminus, and used the radioiodinated construct in binding studies with Balb/c3T3 cells and a variety of human cell lines. 125I-(Y)A194-211 bound specifically, reversibly, saturably, and with low affinity to a large population of binding sites on these cells. In addition, (Y)A194-211 markedly reduced the binding of its parent protein, 125I-PDGF-AAL, to its receptor. (Y)A194-211 also attenuated the binding of epidermal growth factor and several other isoforms of PDGF, but did not interfere with the binding of transferrin to its receptor. These observations were not due to competitive binding of peptide directly to known receptors for the respective growth factors, but was likely due to interaction of (Y)A194-211 with extracellular glycosaminoglycan. Thus, A194-211 may represent an additional heparin binding domain on mature PDGF-AAL, and as an isolate, is capable of modulating interactions between several potent growth factors and their respective receptors.
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