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Advances in Brief |
Departments of Cancer Biology [Y. D. J., K. N., W. L., G. E. G., L. M. E.] and Surgical Oncology [L. M. E.], The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030
Vascular endothelial growth factor (VEGF) is a potent angiogenic factor important for colon cancer neovascularization. In previous studies, serum starvation led to induction of VEGF in human colon carcinoma cells. We investigated the possible participation of mitogen-activated protein kinases in serum starvation induction of VEGF in the HT29 human colon carcinoma cell line. The extracellular signal-regulated kinases (Erks) 1 and 2 were activated after 36 h of serum starvation. Using transient transfection of VEGF promoter-reporter constructs, serum starvation led to an increase in VEGF promoter activity. An inhibitor of phosphorylation of Erk-1/2 blocked the increase of VEGF expression and promoter activity induced by serum starvation. Serum starvation activates several mitogen-activated protein kinases, but activation of Erk-1/2 is critical for the up-regulation of VEGF mRNA in colon carcinoma cells.
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