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- W1982912692 abstract "KDR/Flk-1 tyrosine kinase, one of the two receptors for Vascular Endothelial Growth Factor (VEGF) has been shown to generate the major part of mitotic signals in endothelial cells, although the mechanisms are poorly understood. Here we examined the processing and signal transduction of KDR/Flk-1. Both in endothelial cells and in NIH3T3 cells expressing KDR/Flk-1, an immature form of KDR/Flk-1 with a molecular mass of about 150 kDa was glycosylated to create a 200 kDa intermediate, and after further glycosylation a mature 230 kDa was expressed on the cell surface. Only this 230 kDa form was rapidly and transiently phosphorylated on tyrosine residues in the presence of VEGF. As a major substrate of KDR/Flk-1, PLC-gamma was found to be rapidly tyrosine-phosphorylated and associated with KDR/Flk-1 both in endothelial cells and NIH3T3 cells. Interestingly, however, a prompt activation of MAP kinase and subsequent strong mitotic signaling were generated only in the endothelial cell background. Activation of MAP kinase in NIH3T3 cells overexpressing KDR/Flk-1 showed a slower response as maximum levels were only attained after 20 min compared to 5 min in sinusoidal endothelial cells. These results suggest that the KDR/Flk-1 utilizes cell type-specific signal transduction pathway(s) for MAP kinase activation and the mitotic response in endothelial cells." @default.
- W1982912692 created "2016-06-24" @default.
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- W1982912692 date "1997-05-01" @default.
- W1982912692 modified "2023-10-17" @default.
- W1982912692 title "The 230 kDa mature form of KDR/Flk-1 (VEGF receptor-2) activates the PLC-γ pathway and partially induces mitotic signals in NIH3T3 fibroblasts" @default.
- W1982912692 doi "https://doi.org/10.1038/sj.onc.1201047" @default.
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