Journal
CANCER DETECTION AND PREVENTION
Volume 31, Issue 2, Pages 110-118Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cdp.2007.02.005
Keywords
flavone; breast cancer; colon cancer; tumor suppressor genes; proto-oncogenes; DNA methylation; cell cycle; cell growth inhibition; apoptosis; deleted in liver cancer-1 gene (DLC-1 gene)
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Funding
- NATIONAL CANCER INSTITUTE [Z01BC010038] Funding Source: NIH RePORTER
- Intramural NIH HHS [Z99 CA999999] Funding Source: Medline
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Background: Dietary flavone was previously shown to increase the expression of deleted in liver cancer-1 gene (DLC-1) in HT-29 colon carcinoma cell line [Herzog A, Kindermann B, Doring F, Daniel H, Wenzel U. Pleiotropic molecular effects of the pro-apoptotic dietary constituent flavone in human colon cancer cells identified by protein and mRNA expression profiling. Proteomics 2004;4:2455-64]. DLC-1 that encodes a Rho GTPase-activating protein, functions as a tumor suppressor gene and is frequently inactivated or down-regulated in several common cancers. Restoration of DLC-1 expression suppresses in vitro tumor cells proliferation and tumorigenicity in vivo. Methods: Here, the effect of flavone was examined in several DLC-1-deficient cell lines derived from different types human cancer using, assays for cell proliferation, gene expression and transfer. Results: We show that exposure to 150 mu M flavone increased DLC1 expression in breast but not in liver or prostate carcinoma cells or a nonmalignant breast epithelial cell line. Flavone restored the expression of DLC1 in the breast carcinoma cell lines MDA-MB-468, MDA-MB-361, and BT20 as well as in the colon carcinoma cell line HT-29 all of which are DLC-1-negative due to promoter hypermethylation. We further show that flavone inhibited cell proliferation, induced cell cycle arrest at G-M, increased p21(Waf1) gene expression, and caused apoptosis. Microarray analysis of these aggressive and metastatic breast carcinoma cells revealed 29 flavone-responsive genes, among which the DNA damage-inducible GADD genes were up-regulated and the proto-oncogene STMN1 and IGFBP3 were down-regulated. Conclusions: Flavone-mediated alterations of genes that regulate tumor cell proliferation, cell cycle, and apoptosis contribute to chemopreventive and antitumoral effects of flavone. Alone or in combination with demethylating agents, flavone may be an effective adjunct to chemotherapy in preventing breast cancer metastasis. (C) 2007 International Society for Preventive Oncology. Published by Elsevier Ltd. All fights reserved.
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