Neuropilin-1 Regulates Platelet-derived Growth Factor Receptor Signalling in Mesenchymal Stem Cells

Overview

Journal Biochem J

Specialty Biochemistry

Date 2010 Jan 28

PMID 20102335

Citations 50

Authors

Stephen G Ball

Christopher Bayley

C Adrian Shuttleworth

Cay M Kielty

Affiliations

Soon will be listed here.

Abstract

Using human MSCs (mesenchymal stem cells) lacking VEGF (vascular endothelial growth factor) receptors, we show that the pro-angiogenic receptor neuropilin-1 associates with phosphorylated PDGFRs [PDGF (platelet-derived growth factor) receptors], thereby regulating cell signalling, migration, proliferation and network assembly. Neuropilin-1 co-immunoprecipitated and co-localized with phosphorylated PDGFRs in the presence of growth factors. Neuropilin-1 knockdown blocked PDGF-AA-induced PDGFRalpha phosphorylation and migration, reduced PDGF-BB-induced PDGFRbeta activation and migration, blocked VEGF-A activation of both PDGFRs, and attenuated proliferation. Neuropilin-1 prominently co-localized with both PDGFRs within MSC networks assembled in Matrigel and in the chorioallantoic membrane vasculature microenvironment, and its knockdown grossly disrupted network assembly and decreased PDGFR signalling. Thus neuropilin-1 regulates MSCs by forming ligand-specific receptor complexes that direct PDGFR signalling, especially the PDGFRalpha homodimer. This receptor cross-talk may control the mobilization of MSCs in neovascularization and tissue remodelling.

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