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Blood, 15 April 2005, Vol. 105, No. 8, pp. 3026-3034.
Prepublished online as a Blood First Edition Paper on December 23, 2004; DOI 10.1182/blood-2004-07-2925.
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Submitted July 28, 2004
Accepted December 15, 2004
Control of lymphocyte shape and the chemotactic response by the GTP exchange factor Vav
Miguel Vicente-Manzanares, Aranzazu Cruz-Adalia, Noa B Martin-Cofreces, Jose R Cabrero, Mercedes Dosil, Brenda Alvarado-Sanchez, Xose R Bustelo, and Francisco Sanchez-Madrid*
Servicio de Inmunologia, Hospital Universitario de la Princesa, Madrid, Spain; Present address: Dept. of Cell Biology, School of Medicine, University of Virginia, Charlottesville, VA, USA
Servicio de Inmunologia, Hospital Universitario de la Princesa, Madrid, Spain
Campus Miguel de Unamuno, Centro de Investigacion del Cancer (CIC), Salamanca, Spain
Facultad de Medicina, UASLP, San Luis Potosi, Mexico
* Corresponding author; email: fsanchez.hlpr{at}salud.madrid.org.
Rho GTPases control many facets of cell polarity and migration, namely the reorganization of the cellular cytoskeleton to extracellular stimuli. Rho GTPases are activated by GTP Exchange Factors (GEFs), which induce GDP release and the stabilization of the nucleotide-free state. Thus, the role of GEFs in the regulation of the cellular response to extracellular cues during cell migration is a critical step of this process. In this report, we have analyzed the activation and subcellular localization of the hematopoietic GEF Vav in human peripheral blood lymphocytes stimulated with the chemokine SDF-1  . We show a robust activation of Vav and its redistribution to motility-associated subcellular structures, and we provide biochemical evidence of the recruitment of Vav to the membrane of SDF-1 -activated human lymphocytes, where it transiently interacts with the SDF-1 receptor CXCR4. Overexpression of a dominant negative form of Vav abolished lymphocyte polarization, actin polymerization and migration. SDF-1 -mediated cell polarization and migration were also impaired by overexpression of an active, oncogenic Vav, although the mechanism appears to be different. Together, our data postulate a pivotal role for Vav in the transmission of the migratory signal through the chemokine receptor CXCR4.
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