Abstract
Loss of E-cadherin is a key initial step in the transdifferentiation of epithelial cells to a mesenchymal phenotype, which occurs when tumor epithelial cells invade into surrounding tissues. Expression of the nuclear factor ZEB1 induces an epithelial-to-mesenchymal transition and confers a metastatic phenotype on carcinomas by repressing the E-cadherin gene at the transcriptional level. In this study, we show that ZEB1 interacts with the SWI/SNF chromatin-remodeling protein BRG1 to regulate E-cadherin independently of CtBP, its traditional co-repressor. Blocking the interaction between ZEB1 and BRG1 induces expression of E-cadherin and downregulation of the mesenchymal marker vimentin. ZEB1 and BRG1 colocalize in E-cadherin-negative cells from cancer lines and in the stroma of normal colon. Colocalization of ZEB1 and BRG1 in epithelial cells is only found in those de-differentiated cells characterized by nuclear β-catenin staining at the invasive edge of the tumor. Our results identify ZEB1/BRG1 as a new transcriptional mechanism regulating E-cadherin expression and epithelial-to-mesenchymal transdifferentiation that may be involved during the initial stages of tumor invasion.
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Acknowledgements
We are indebted to all of the researchers who kindly provided us with cell lines and plasmids (see Supplementary Information). We also thank M Morales (Department Physiological Sciences) and staff from the Technical Science Services at the University of Barcelona for their help in confocal analysis, M Rickman (IDIBAPS) and the Pathology Department at the Hospital Clinic of Barcelona for technical advice and M Parrizas (IDIBAPS) for helpful recommendations on ChIP assays. We are also grateful to R Gasa (IDIBAPS) for critical reading of the paper and J Moore for help with English editing. We apologize to those researchers whose work was cited indirectly through reviews because of space limitations. Initial work in this study was supported by a grant from La Caixa Foundation (BM-06570) to AP. At later stages, this project was funded by the Spanish Ministry of Science and Innovation (MICINN) (BFU2007-60302) and Olga Torres Foundation (FOT-0902) to AP. EST's salary was partly funded by Grant BM-06570.
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Sánchez-Tilló, E., Lázaro, A., Torrent, R. et al. ZEB1 represses E-cadherin and induces an EMT by recruiting the SWI/SNF chromatin-remodeling protein BRG1. Oncogene 29, 3490–3500 (2010). https://doi.org/10.1038/onc.2010.102
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DOI: https://doi.org/10.1038/onc.2010.102