Vascular endothelial growth factor induces SHC association with vascular endothelial cadherin: a potential feedback mechanism to control vascular endothelial …

A Zanetti, MG Lampugnani, G Balconi… - … , and vascular biology, 2002 - Am Heart Assoc
A Zanetti, MG Lampugnani, G Balconi, F Breviario, M Corada, L Lanfrancone, E Dejana
Arteriosclerosis, thrombosis, and vascular biology, 2002Am Heart Assoc
Vascular endothelial (VE)-cadherin is endothelium specific, mediates homophilic adhesion,
and is clustered at intercellular junctions. VE-cadherin is required for normal development of
the vasculature in the embryo and for angiogenesis in the adult. Here, we report that VE-
cadherin is associated with VE growth factor (VEGF) receptor-2 (VEGFR-2) on the exposure
of endothelial cells to VEGF. The binding parallels receptor phosphorylation on tyrosine
residues, which is maximal at 5 minutes and then declines within 30 minutes. Tyrosine …
Vascular endothelial (VE)-cadherin is endothelium specific, mediates homophilic adhesion, and is clustered at intercellular junctions. VE-cadherin is required for normal development of the vasculature in the embryo and for angiogenesis in the adult. Here, we report that VE-cadherin is associated with VE growth factor (VEGF) receptor-2 (VEGFR-2) on the exposure of endothelial cells to VEGF. The binding parallels receptor phosphorylation on tyrosine residues, which is maximal at 5 minutes and then declines within 30 minutes. Tyrosine phosphorylation of VE-cadherin was maximal at 30 minutes after the addition of the growth factor. At this time point, the protein could be coimmunoprecipitated with the adaptor protein Shc. Pull-down experiments with different Shc domains and mutants of the VE-cadherin cytoplasmic tail have shown that Shc binds to the carboxy-terminal domain of the VE-cadherin tail through its Src homology 2 domain (SH2). We found that Shc phosphorylation lasts longer in endothelial cells carrying a targeted null mutation in the VE-cadherin gene than in VE-cadherin–positive cells. These data suggest that VE-cadherin expression exerts a negative effect on Shc phosphorylation by VEGFR-2. We speculate that VE-cadherin binding to Shc promotes its dephosphorylation through associated phosphatases.
Am Heart Assoc