Article ID Journal Published Year Pages File Type
4322007 Neuron 2010 15 Pages PDF
Abstract

SummaryCommon factors are thought to control vascular and neuronal patterning. Here we report an in vivo requirement for the vascular endothelial growth factor receptor type 2 (VEGFR2) in axon tract formation in the mouse brain. We show that VEGFR2 is expressed by neurons of the subiculum and mediates axonal elongation in response to the semaphorin (Sema) family molecule, Sema3E. We further show that VEGFR2 associates with the PlexinD1/Neuropilin-1 (Nrp1) receptor complex for Sema3E and becomes tyrosine-phosphorylated upon Sema3E stimulation. In subicular neurons, Sema3E triggers VEGFR2-dependent activation of the phosphatidylinositol-3 kinase (PI3K)/Akt pathway that is required for the increase in axonal growth. These results implicate VEGFR2 in axonal wiring through a mechanism dependent on Sema3E and independent of vascular endothelial growth factor (VEGF) ligands. This mechanism provides an explanation as to how a semaphorin can activate an axon growth promoting response in developing neurons.

► VEGFR2 is expressed on developing axonal tracts in the mouse brain ► VEGFR2 is important for establishment of neuronal projections ► VEGFR2/PlexinD1/Neuropilin1 form a trimeric receptor complex for Semaphorin3E ► VEGFR2 transduces the growth-promoting and attractive activity of Semaphorin3E

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