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From the Departments of Pathology* and Medicine, University of Pittsburgh Cancer Institute, Pittsburgh, Pennsylvania; and the Ludwig Institute for Cancer Research, San Diego Branch and Department of Medicine and Center for Molecular Genetics, University of California San Diego, La Jolla, California
Platelet-derived growth factor (PDGF)-B and its receptor (PDGF-R) ß are overexpressed in human gliomas and responsible for recruiting peri-endothelial cells to vessels. To establish the role of PDGF-B in glioma angiogenesis, we overexpressed PDGF-B in U87MG glioma cells. Although PDGF-B stimulated tyrosine phosphorylation of PDGF-Rß in U87MG cells, treatment with recombinant PDGF-B or overexpression of PDGF-B in U87MG cells had no effect on their proliferation. However, an increase of secreted PDGF-B in conditioned media of U87MG/PDGF-B cells promoted migration of endothelial cells expressing PDGF-Rß, whereas conditioned media from U87MG cells did not increase the cell migration. In mice, overexpression of PDGF-B in U87MG cells enhanced intracranial glioma formation by stimulating vascular endothelial growth factor (VEGF) expression in neovessels and by attracting vessel-associated pericytes. When PDGF-B and VEGF were overexpressed simultaneously by U87MG tumors, there was a marked increase of capillary-associated pericytes as seen in U87MG/VEGF165/PDGF-B gliomas. As a result of pericyte recruitment, vessels induced by VEGF in tumor vicinity migrated into the central regions of these tumors. These data suggest that PDGF-B is a paracrine factor in U87MG gliomas, and that PDGF-B enhances glioma angiogenesis, at least in part, by stimulating VEGF expression in tumor endothelia and by recruiting pericytes to neovessels.
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