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Experimental Therapeutics |
Chiron Corporation, Emeryville, California 94608 [V. E., S. H. L., L. I., L. G., C. G., E. G., M. W., P. D. G., J. H. F., V. C., F. R., R. G., J. E., S. L. A., W. J. F.], and Departments of Surgery [R. S. W.] and Obstetrics/Gynecology and Reproductive Sciences [R. N. T.], University of California San Francisco, California 94143-0556
To evaluate whether ß-catenin signaling has a role in the regulation of angiogenesis in colon cancer, a series of angiogenesis-related gene promoters was analyzed for ß-catenin/TCF binding sites. Strikingly, the gene promoter of human vascular endothelial growth factor (VEGF, or VEGF-A) contains seven consensus binding sites for ß-catenin/TCF. Analysis of laser capture microdissected human colon cancer tissue indicated a direct correlation between up-regulation of VEGF-A expression and adenomatous polyposis coli (APC) mutational status (activation of ß-catenin signaling) in primary tumors. In metastases, this correlation was not observed. Analysis by immunohistochemistry of intestinal polyps in mice heterozygous for the multiple intestinal neoplasia gene (Min/+) at 5 months revealed an increase and redistribution of VEGF-A in proximity to those cells expressing nuclear ß-catenin with a corresponding increase in vessel density. Transfection of normal colon epithelial cells with activated ß-catenin up-regulated levels of VEGF-A mRNA and protein by 250300%. When colon cancer cells with elevated ß-catenin levels were treated with ß-catenin antisense oligodeoxynucleotides, VEGF-A expression was reduced by more than 50%. Taken together, our observations indicate a close link between ß-catenin signaling and the regulation of VEGF-A expression in colon cancer.
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