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Ligand-induced internalization selects use of common receptor neuropilin-1 by VEGF165 and semaphorin3A.

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.

journal_name

Blood

journal_title

Blood

authors

Narazaki M,Tosato G

doi

10.1182/blood-2005-10-4113

subject

Has Abstract

pub_date

2006-05-15 00:00:00

pages

3892-901

issue

10

eissn

0006-4971

issn

1528-0020

pii

2005-10-4113

journal_volume

107

pub_type

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