Heparin amplifies platelet-derived growth factor (PDGF)- BB-induced PDGF alpha -receptor but not PDGF beta -receptor tyrosine phosphorylation in heparan sulfate-deficient cells. Effects on signal transduction and biological responses

The Journal of Biological Chemistry
Charlotte RolnyLena Claesson-Welsh

Abstract

Platelet-derived growth factor (PDGF) induces mitogenic and migratory responses in a wide variety of cells, by activating specific receptor tyrosine kinases denoted the PDGF alpha- and beta-receptors. Different PDGF isoforms bind in a distinct manner to glycosaminoglycans, particularly heparan sulfate. In the present study, we show potentiation by exogenous heparin of PDGF-BB-induced PDGF alpha-receptor tyrosine phosphorylation in heparan sulfate-deficient Chinese hamster ovary (CHO) 677 cells. This effect was not seen for PDGF-AA treatment, and heparin lacked a potentiating effect on PDGF-BB stimulation of the PDGF beta-receptor. Heparin did not affect the affinity of PDGF-BB binding for the PDGF receptors on CHO 677 cells. The PDGF-BB-stimulated PDGF alpha-receptor phosphorylation was enhanced in a dose-dependent fashion by heparin at low concentration. The effect was modulated by 2-O- and 6-O-desulfation of the polysaccharide. Maximal induction of PDGF alpha-receptor tyrosine phosphorylation (6-fold) in CHO 677 cells was achieved by treatment with a heparin decasaccharide, but shorter oligosaccharides consisting of four or more monosaccharide units were also able to augment PDGF alpha-receptor phosphorylation, albeit at high...Continue Reading

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