Ligand-induced Internalization Selects Use of Common Receptor Neuropilin-1 by Vegf165 and Semaphorin3a.
From: Basic Research Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health, 10 Center Drive 12N226, Bethesda, MD 20892-1907. narazakm@mail.nih.gov
Blood
- Publish Date: May 2006
- ISSN: 0006-4971
- Volume: 107
- Issue: 10
- Pages: 3892-901
- Medium: Print
- Language: English
- Citation (JAMA): Narazaki Masashi, Tosato Giovanna, et al. Ligand-induced Internalization Selects Use of Common Receptor Neuropilin-1 by Vegf165 and Semaphorin3a.. Blood May 2006;107:3892-901
Abstract
Neuropilin-1 (Npn-1) is a receptor shared by class 3 semaphorins and heparin-binding forms of vascular endothelial growth factor (VEGF), protein families that regulate endothelial and neuronal-cell function. Ligand interaction with Npn-1 dictates the choice of signal transducer; plexins transduce semaphorin signals, and VEGF receptors transduce VEGF signals. It is not clear how class 3 semaphorins affect endothelial-cell function and how the shared receptor Npn-1 selects its ligand. We report that semaphorin3A (Sema3A) inhibits endothelial-cell lamellipodia formation, adhesion, survival, proliferation, and cord formation. VEGF(165), but not VEGF(121), could block all these effects of Sema3A. VEGF(165) competed with Sema3A for binding to endothelial cells, effectively reduced cell-surface Npn-1, and promoted its internalization. Use of soluble forms of Npn-1 or VEGF receptor-1 to block VEGF(165) binding to Npn-1 or to VEGF receptors provided evidence that surface Npn-1 and VEGF receptors are required for VEGF(165)-induced Npn-1 internalization. Sema3A also reduced cell-surface Npn-1 in endothelial cells and promoted its internalization, but required a higher concentration than VEGF(165). These results demonstrate that preferential receptor binding and internalization by a ligand are mechanisms by which the common receptor Npn-1 can play an essential role in prioritizing conflicting signals.
Mesh Headings (Keywords): Biological Transport, Cell Adhesion, Cell Division, Cell Line, Cell Survival, Cells, Cultured, Endothelium, Vascular, Fetal Blood, Flow Cytometry, Humans, Ligands, Neuropilin-1, Recombinant Proteins, Semaphorin-3A, Umbilical Veins, Vascular Endothelial Growth Factor A
Check for Full Text / PubMed Unique Identifier (PMID): 16424390
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