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Metastasis is a multistep process during which cancer cells disseminate from the site of primary tumors and establish secondary tumors in distant organs. In a search for key regulators of metastasis in a murine breast tumor model, we have found that the transcription factor Twist, a master regulator of embryonic morphogenesis, plays an essential role in metastasis. Suppression of Twist expression in highly metastatic mammary carcinoma cells specifically inhibits their ability to metastasize from the mammary gland to the lung. Ectopic expression of Twist results in loss of E-cadherin-mediated cell-cell adhesion, activation of mesenchymal markers, and induction of cell motility, suggesting that Twist contributes to metastasis by promoting an epithelial-mesenchymal transition (EMT). In human breast cancers, high level of Twist expression is correlated with invasive lobular carcinoma, a highly infiltrating tumor type associated with loss of E-cadherin expression. These results establish a mechanistic link between Twist, EMT, and tumor metastasis.
Pubmed ID: 15210113 RIS Download
Mesh terms: Animals | Breast Neoplasms | Cadherins | Carcinoma, Lobular | Cell Line | Cell Line, Tumor | Cell Movement | Epithelial Cells | Female | Gene Expression Regulation, Neoplastic | Humans | Luciferases | Lung Neoplasms | Mammary Neoplasms, Experimental | Mesoderm | Mice | Mice, Inbred BALB C | Morphogenesis | Myogenic Regulatory Factors | Neoplasm Invasiveness | Neoplasm Metastasis | Neoplasm Transplantation | Nuclear Proteins | Organ Size | RNA, Messenger | RNA, Small Interfering | Transcription Factors | Twist-Related Protein 1
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