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Structural and functional relation of neuropilins
Fumio Nakamura1, Yoshio Goshima
1Department of Molecular Pharmacology and Neurobiology, Yokohama City University School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, Kanagawa, 236-0004, Japan.
Advances in Experimental Medicine and Biology
|March 5, 2003
Summary
Neuropilins are transmembrane receptors that bind semaphorins and vascular endothelial growth factors (VEGFs). They require co-receptors like Plexin-A or VEGF receptors for signaling, with crosstalk suggesting antagonistic roles.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Neuropilins (NPs) are type I transmembrane proteins.
- Two homologues, NP-1 and NP-2, share conserved domain structures.
- Splice variants include truncated, secreted forms.
Purpose of the Study:
- To elucidate the structure and function of Neuropilin-1 and Neuropilin-2.
- To investigate Neuropilin's role as a receptor for semaphorins and VEGF.
- To explore the signaling mechanisms and crosstalk involving Neuropilins.
Main Methods:
- Structural analysis of Neuropilin domains (CUB, FV/FVIII, MAM).
- Ligand binding studies with semaphorins and VEGF isoforms.
- Investigation of co-receptor interactions (Plexin-A, VEGF receptors).
Main Results:
- Neuropilins bind class 3 semaphorins and specific VEGF isoforms.
- Co-receptors (Plexin-A, VEGFR) are essential for biological activity.
- The CUB/FV/FVIII domains bind ligands; the MAM domain mediates semaphorin signaling.
Conclusions:
- Neuropilins function as crucial receptors and co-receptors in cellular signaling pathways.
- Crosstalk between semaphorin and VEGF signaling via Neuropilins suggests complex regulatory roles.
- Secreted Neuropilins may antagonize VEGF signaling, impacting growth factor activity.