VEGF regulates the mobilization of VEGFR2/KDR from an intracellular endothelial storage compartment.

Blood
Alexandra GampelHarry Mellor

Abstract

Endothelial cells respond to vascular endothelial growth factor (VEGF) to produce new blood vessels. This process of angiogenesis makes a critical contribution during embryogenesis and also in the response to ischemia in adult tissues. We have studied the intracellular trafficking of the major VEGF receptor KDR (VEGFR2). Unlike other related growth factor receptors, we find that a significant proportion of KDR is held in an endosomal storage pool within endothelial cells. We find that KDR can be delivered to the plasma membrane from this intracellular pool and that VEGF stimulates this recycling to the cell surface. KDR recycling appears to be distinct from the previously characterized Rab4- and Rab11-dependent pathways, but, instead, KDR(+) recycling vesicles contain Src tyrosine kinase and VEGF-stimulated recycling requires Src activation. Taken together, these data show that intracellular trafficking of KDR is markedly different from other receptor tyrosine kinases and suggest that the regulation of KDR trafficking by VEGF provides a novel mechanism for controlling the sensitivity of endothelial cells to proangiogenic signals.

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