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Plakoglobin interacts with and increases the protein levels of metastasis suppressor Nm23-H2 and regulates the expression of Nm23-H1

Oncogene volume 29, pages 2118–2129 (2010)Cite this article

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Abstract

Plakoglobin (γ-catenin) is a homolog of β-catenin with similar dual adhesive and signaling functions. The adhesive function of these proteins is mediated by their interactions with cadherins, whereas their signaling activity is regulated by association with various intracellular partners. In this respect, β-catenin has a well-defined oncogenic activity through its role in the Wnt signaling pathway, whereas plakoglobin acts as a tumor/metastasis suppressor through mechanisms that remain unclear. We previously expressed plakoglobin in SCC9 squamous carcinoma cells (SCC9-P) and observed a mesenchymal-to-epidermoid transition. Comparison of the protein and RNA profiles of parental SCC9 cells and SCC9-P transfectants identified various differentially expressed proteins and transcripts, including the nonmetastatic protein 23 (Nm23). In this study, we show that Nm23-H1 mRNA and Nm23-H2 protein are increased after plakoglobin expression. Coimmunoprecipitation and confocal microscopy studies using SCC9-P and various epithelial cell lines with endogenous plakoglobin expression revealed that Nm23 interacts with plakoglobin, cadherins and α-catenin. Furthermore, Nm23-H2 is the primary isoform involved in these interactions, which occur prominently in the cytoskeleton-associated pool of cellular proteins. In addition, we show that plakoglobin–Nm23 interaction requires the N-terminal (α-catenin interacting) domain of plakoglobin. Our data suggest that by increasing the expression and stability of Nm23, plakoglobin has a role in regulating the metastasis suppressor activity of Nm23, which may further provide a potential mechanism for the tumor/metastasis suppressor function of plakoglobin itself.

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Acknowledgements

This work is supported by the Alberta Cancer Research Institute and the Canadian Breast Cancer Foundation—Prairies/NWT Chapter (MP) and Canadian Institutes of Health Research Frederick Banting and Charles Best Canada Graduate Scholarships award (ZA). LL is supported by the Canadian Research Chairs Program. JM is supported by the Alberta Cancer Research Institute and Alberta Cancer Foundation. ZA currently holds a Killam Doctoral Award.

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  1. Department of Cell Biology, University of Alberta, Edmonton, Alberta, Canada

    Z Aktary, K Chapman, L Lam & M Pasdar

  2. Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada

    A Lo, C Ji & L Li

  3. Department of Oncology, University of Alberta, Edmonton, Alberta, Canada

    K Graham, L Cook & J R Mackey

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Aktary, Z., Chapman, K., Lam, L. et al. Plakoglobin interacts with and increases the protein levels of metastasis suppressor Nm23-H2 and regulates the expression of Nm23-H1. Oncogene 29, 2118–2129 (2010). https://doi.org/10.1038/onc.2009.495

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