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CD93 Signaling via Rho Proteins Drives Cytoskeletal Remodeling in Spreading Endothelial Cells
Authors:Stefano Barbera  Luisa Raucci  Roberta Lugano  Gian Marco Tosi  Anna Dimberg  Annalisa Santucci  Federico Galvagni  Maurizio Orlandini
Affiliation:1.Department of Biotechnology, Chemistry and Pharmacy, University of Siena, 53100 Siena, Italy; (S.B.); (L.R.); (A.S.); (F.G.);2.Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Rudbeck Laboratory, SE-75185 Uppsala, Sweden; (R.L.); (A.D.);3.Ophthalmology Unit, Department of Medicine, Surgery and Neuroscience, University of Siena, 53100 Siena, Italy;
Abstract:During angiogenesis, cell adhesion molecules expressed on the endothelial cell surface promote the growth and survival of newly forming vessels. Hence, elucidation of the signaling pathways activated by cell-to-matrix adhesion may assist in the discovery of new targets to be used in antiangiogenic therapy. In proliferating endothelial cells, the single-pass transmembrane glycoprotein CD93 has recently emerged as an important endothelial cell adhesion molecule regulating vascular maturation. In this study, we unveil a signaling pathway triggered by CD93 that regulates actin cytoskeletal dynamics responsible of endothelial cell adhesion. We show that the Src-dependent phosphorylation of CD93 and the adaptor protein Cbl leads to the recruitment of Crk, which works as a downstream integrator in the CD93-mediated signaling. Moreover, confocal microscopy analysis of FRET-based biosensors shows that CD93 drives the coordinated activation of Rac1 and RhoA at the cell edge of spreading cells, thus promoting the establishment of cell polarity and adhesion required for cell motility.
Keywords:Src   Cbl   Crk   Rac1   Cdc42   RhoA
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