Journal
FUTURE ONCOLOGY
Volume 5, Issue 8, Pages 1129-1143Publisher
FUTURE MEDICINE LTD
DOI: 10.2217/FON.09.94
Keywords
cancer; development; epithelial-mesenchymal transition; metastasis; Six1; Snail/Slug; TGF-beta; Twist; Wnt
Categories
Funding
- National Cancer Institute [2RO1-CA095277]
- American Cancer Society [RSG-07-183-101-DDC]
- Susan G Komen Foundation [BCTR0707562]
- Cancer League of Colorado
- Department of Defense Breast Cancer Research Program [W81XWH-06-01-0757]
- NATIONAL CANCER INSTITUTE [R01CA095277] Funding Source: NIH RePORTER
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The epithelial-mesenchymal transition (EMT) is a critical developmental process from the earliest events of embryogenesis to later morphogenesis and organ formation. EMT contributes to the complex architecture of the embryo by permitting the progression of embryogenesis from a simple single-cell layer epithelium to a complex three-dimensional organism composed of both epithelial and mesenchymal cells. However, in most tissues EMT is a developmentally restricted process and fully differentiated epithelia typically maintain their epithelial phenotype. Recently, elements of EMT, specifically the loss of epithelial markers and the gain of mesenchymal markers, have been observed in pathological states, including epithelial cancers, Analysis of the molecular mechanisms of this oncogenic epithelial plasticity have implicated the inappropriate expression and activation of developmental EMT programs, suggesting that cancer cells may reinstitute properties of developmental EMT including enhanced migration and invasion. Thus, in the context of cancer, an EMT-like process may permit dissemination of tumor cells from the primary tumor into the surrounding stroma, setting the stage for metastatic spread. Consistent with this hypothesis, activation of these developmental EMT programs in human cancer correlates with advanced disease and poor prognosis. This review will focus on the current knowledge regarding developmental EMT pathways that have been implicated in cancer progression.
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