Class 3 semaphorins control vascular morphogenesis by inhibiting integrin function

Luca Tamagnone, Guido Serini, Donatella Valdembri, Sara Zanivan, Giulla Morterra, Constanze Burkhardt, Francesca Caccavari, Luca Zammataro, Luca Primo, Malcolm Logan, Marc Tessier-Lavigne, Masahiko Taniguchi, Andreas W. Püschel, Federico Bussolino

Risultato della ricerca: Contributo in rivistaArticolo in rivista

466 Citazioni (Scopus)

Abstract

The motility and morphogenesis of endothelial cells is controlled by spatio-temporally regulated activation of integrin adhesion receptors, and integrin activation is stimulated by major determinants of vascular remodelling. In order for endothelial cells to be responsive to changes in activator gradients, the adhesiveness of these cells to the extracellular matrix must be dynamic, and negative regulators of integrins could be required. Here we show that during vascular development and experimental angiogenesis, endothelial cells generate autocrine chemorepulsive signals of class 3 semaphorins (SEMA3 proteins) that localize at nascent adhesive sites in spreading endothelial cells. Disrupting endogenous SEMA3 function in endothelial cells stimulates integrin-mediated adhesion and migration to extracellular matrices, whereas exogenous SEMA3 proteins antagonize integrin activation. Misexpression of dominant negative SEMA3 receptors in chick embryo endothelial cells locks integrins in an active conformation, and severely impairs vascular remodelling. Sema3a null mice show vascular defects as well. Thus during angiogenesis endothelial SEMA3 proteins endow the vascular system with the plasticity required for its reshaping by controlling integrin function.
Lingua originaleEnglish
pagine (da-a)391-397
Numero di pagine7
RivistaNature
Volume424
DOI
Stato di pubblicazionePubblicato - 2003

Keywords

  • Medicine (all)
  • Multidisciplinary

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