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Platelet-derived growth factor (PDGF)-D is a PDGF receptor β (PDGFRβ)-specific ligand implicated in a number of pathological conditions, such as cardiovascular disease and cancer, but its biological function remains incompletely understood. In this study, we demonstrate that PDGF-D binds directly to neuropilin 1 (NRP1), in a manner that requires the PDGF-D C-terminal Arg residue. Stimulation with PDGF-D, but not PDGF-B, induced PDGFRβ-NRP1 complex formation in fibroblasts. Additionally, PDGF-D induced translocation of NRP1 to cell-cell junctions in endothelial cells, independently of PDGFRβ, altering the availability of NRP1 for VEGF-A-VEGFR2 signaling. PDGF-D showed differential effects on pericyte behavior in ex vivo sprouting assays compared to PDGF-B. Furthermore, PDGF-D-induced PDGFRβ-NRP1 interaction can occur in trans between molecules located in different cells (endothelial cells and pericytes). In summary, we show that NRP1 can act as a co-receptor for PDGF-D-PDGFRβ signaling and is possibly implicated in intercellular communication in the vascular wall.

Neuropilin 1 binds platelet-derived growth factor (PDGF)-D and is a co-receptor in PDGF-D/PDGF receptor β signaling