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Restoration of positioning control following Disabled-2 expression in ovarian and breast tumor cells

Oncogene volume 19, pages 4847–4854 (2000)Cite this article

Abstract

The physical interaction of epithelial cells with the basement membrane ensures correct positioning and acts as a survival factor for epithelial cells. Cells that detach from the basement membrane often undergo apoptosis; however, in carcinomas, this positional control is absent, permitting disorganized cell proliferation. In the majority of breast and ovarian carcinomas (85–90%), the expression of a candidate tumor suppressor, Disabled-2 (Dab2), is frequently lost. The Dab2-negative tumor cells are no longer in contact with an intact basement membrane, as indicated by the absence of collagen IV (in about 90% of cases). However, in the subset (10–15%) of ovarian tumors in which Dab2 expression is positive, the presence of a basement membrane-like structure around tumor cells was observed. Recombinant adenovirus-mediated expression of Dab2 was used in Dab2-negative ovarian and breast cancer cells, and re-expression of Dab2 was found to lead to cell death or growth arrest. Dab2 expression suppressed MAPK activation and c-fos expression. Plating the infected cells on a basement membrane matrigel rescued the cells from death and growth arrest. Thus, Dab2 exhibits a negative activity for cell growth and survival, which can be countered by attachment of the cells to basement membrane matrix. We conclude that Dab2 functions in cell positioning control and mediates the exigency for basement membrane attachment of epithelial cells. Loss of Dab2 may contribute to the basement membrane-independent, disorganized proliferation of tumor cells in ovarian and breast carcinomas.

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Acknowledgements

We thank Drs Andrew Fischer and Wayne Harris for their suggestions and discussion of the experiments and results. We also thank Ms Jackie Bradshaw for her assistance in preparation of this manuscript. These studies were supported by NCI/NIH grants to XX Xu (CA 75389 and CA 79716).

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Authors and Affiliations

  1. Department of Biochemistry and Winship Cancer Institute, Emory University School of Medicine, Atlanta, 30322, Georgia, GA, USA

    Zejuan Sheng, Wenping Sun, Elizabeth Smith & Xiang-Xi Xu

  2. Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, 30322, Georgia, GA, USA

    Cynthia Cohen

  3. Amgen Inc., Thousand Oaks, 91320, California, CA, USA

    Zeqi Sheng

  4. Medical Science Division, Ovarian Cancer Program, Fox Chase Cancer Center, 7701 Burholme Avenue, Philadelphia, 19111, Pennsylvania, PA, USA

    Xiang-Xi Xu

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Sheng, Z., Sun, W., Smith, E. et al. Restoration of positioning control following Disabled-2 expression in ovarian and breast tumor cells. Oncogene 19, 4847–4854 (2000). https://doi.org/10.1038/sj.onc.1203853

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