The activation of RhoGTPases, which is mediated by guanine nucleotide exchange factors (GEF), is a pivotal step in the angiogenic response of the endothelium to stimulation with vascular endothelial growth factor (VEGF) and angiotensin II. We recently identified two endo-thelial GEF subfamilies, the GEF10 and the p63RhoGEF subfamily, as potential mediators of the VEGF- and angiotensin II-induced RhoA activation in the vascular endothelium. The current project therefore characterizes the role of these GEFs in angiogenesis in vitro and in vivo. |