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  • Original Paper
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VEGF activates protein kinase C-dependent, but Ras-independent Raf-MEK-MAP kinase pathway for DNA synthesis in primary endothelial cells

Abstract

KDR/Flk-1 tyrosine kinase, one of the two VEGF receptors induces mitogenesis and differentiation of vascular endothelial cells. We have previously reported that a major target molecule of KDR/Flk-1 kinase is PLC-γ, and that VEGF induces activation of MAP kinase, mainly mediated by protein kinase C (PKC) in the NIH3T3 cells overexpressing KDR/Flk-1 (Takahashi and Shibuya, 1997). However, the signal transduction initiated from VEGF in endothelial cells remains to be elucidated. In primary sinusoidal endothelial cells which showed strictly VEGF-dependent growth, we found that VEGF stimulated the activation of Raf-1-MEK-MAP kinase cascade. To our surprise, an important regulator, Ras was not efficiently activated to a significant level in response to VEGF. Consistent with this, dominant-negative Ras did not block the VEGF-induced phosphorylation of MAP kinase. On the other hand, PKC-specific inhibitors severely reduced VEGF-dependent phosphorylation of MEK, activation of MAP kinase and subsequent DNA synthesis. A potent PI3 kinase inhibitor, Wortmannin, could not inhibit either of them. These results suggest that in primary endothelial cells, VEGF-induced activation of Raf-MEK-MAP kinase and DNA synthesis are mainly mediated by PKC-dependent pathway, much more than by Ras-dependent or PI3 kinase-dependent pathway.

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Acknowledgements

We would like to thank Drs Eisuke Nishida, Hitoshi Ito and Hiroshi Koide for supplying Raf kinase assay system; Drs Yoshitomo Oka and Hideki Katagiri for the adenoviral vector expressing Ki-Ras17N; Dr Yasuhisa Fukui for monoclonal antibody against p85 subunit of PI3 kinase; Dr Tadaomi Takenawa for anti-Grb2 serum. We are also grateful to Mrs S Yamaguchi and A Sawano for excellent technical assistance. This work was supported by Grant-in-Aid for Special Project Research on Cancer-Bioscience 04253204 from the Ministry of Education and by research grants from the Yakult Bioscience Foundation, the Mitsubishi Foundation and the Foundation for Promotion of Cancer Research in Japan.

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Takahashi, T., Ueno, H. & Shibuya, M. VEGF activates protein kinase C-dependent, but Ras-independent Raf-MEK-MAP kinase pathway for DNA synthesis in primary endothelial cells. Oncogene 18, 2221–2230 (1999). https://doi.org/10.1038/sj.onc.1202527

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