Abstract
Anchorage-independent growth is a hallmark of tumor growth and results from enhanced proliferation and altered cell–cell and cell-matrix interactions. By using gene-deficient mouse embryonic fibroblasts (MEFs), we showed for the first time that NHERF1/EBP50 (Na/H exchanger regulator factor 1/ezrin-radixin-moesin binding phosphoprotein 50), an adapter protein with membrane localization under physiological conditions, inhibits cell motility and is required to suppress anchorage-independent growth. Both NHERF1 PDZ domains are necessary for the tumor suppressor effect. NHERF1 associates directly through the PDZ2 domain with β-catenin and is required for β-catenin localization at the cell–cell junctions in MEFs. Mechanistically, the absence of NHERF1 selectively decreased the interaction of β-catenin with E-cadherin, but not with N-cadherin. The ensuing disorganization of E-cadherin-mediated adherens junctions as well as the observed moderate increase in β-catenin transcriptional activity contributed most likely to the anchorage-independent growth of NHERF1-deficient MEFs. In vivo, NHERF1 is specifically localized at the apical brush-border membrane in intestinal epithelial cells and is required to maintain a fraction of the cortical β-catenin at this level. Thus, NHERF1 emerges as a cofactor essential for the integrity of epithelial tissues by maintaining the proper localization and complex assembly of β-catenin.
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Acknowledgements
MMG acknowledges support from MD Anderson Cancer Center Tobacco Fund and NCI-CA107201, FCM from American Brain Tumor Association and ELK from NCI-CA09299-26. NCI-CA16672 partially supported animal breeding.
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Kreimann, E., Morales, F., de Orbeta-Cruz, J. et al. Cortical stabilization of β-catenin contributes to NHERF1/EBP50 tumor suppressor function. Oncogene 26, 5290–5299 (2007). https://doi.org/10.1038/sj.onc.1210336
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DOI: https://doi.org/10.1038/sj.onc.1210336
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