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Gab2 regulates the migratory behaviors and E-cadherin expression via activation of the PI3K pathway in ovarian cancer cells

Oncogene volume 31, pages 2512–2520 (2012)Cite this article

Abstract

Ovarian cancer, the most deadly gynecologic malignancy, is often diagnosed late and at the advanced stage when the cancer cells have already migrated and invaded into other tissues and organs. Better understanding of the mechanism of metastasis in ovarian cancer cells is essential to the design of effective therapy. In this study, we investigated the function of scaffolding adaptor protein Gab2 in ovarian cancer cells. Gab2 is found to be overexpressed in a subset of ovarian tumors and cancer cell lines. Gab2 expression mainly regulates the migratory behaviors of ovarian cancer cells. Overexpression of Gab2 promotes the migration and invasion, and downregulates E-cadherin expression in ovarian cancer cells with low-Gab2 expression. Conversely, knockdown of Gab2 expression inhibits the migration and invasion, and promotes E-cadherin expression in ovarian cancer cells with high-Gab2 expression. By expressing Gab2 wild-type and Gab2 mutants that are defective in activation of the PI3K and Shp2-Erk pathways, we find that Gab2 inhibits E-cadherin expression and enhances the expression of Zeb1, a transcription factor involved in epithelial-to-mesenchymal transition (EMT), and cell migration and invasion through the activation of the PI3K pathway. Knockdown of Zeb1 expression blocks Gab2-induced suppression of E-cadherin expression and increase in cell invasion. LY294002 and GDC-0941, inhibitors of PI3K, or Rapamycin, an inhibitor of PI3K downstream target mTOR, can reverse the effects of Gab2 on migration and invasion. Overall, our studies reveal that Gab2 overexpression, via activation of the PI3K-Zeb1 pathway, promotes characteristics of EMT in ovarian cancer cells.

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Acknowledgements

We thank Dr Sam Mok for the HOSE lines. This work is supported by the Department of Pathology, University of Colorado, Anschutz Medical Campus and in part by the National Institutes of Health grant R01-AI51612 (to HG).

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Authors and Affiliations

  1. Department of Pathology, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, USA

    Y Wang & H Gu

  2. Department of Obstetrics and Gynecology, Divison of Basic Reproductive Sciences and Gynecologic Oncology, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, USA

    Q Sheng

  3. Department of Cancer Biology, Dana-Farber Cancer Institute, and Harvard Medical School, Boston, MA, USA

    M A Spillman & K Behbakht

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  1. Y Wang
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Correspondence to H Gu.

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Wang, Y., Sheng, Q., Spillman, M. et al. Gab2 regulates the migratory behaviors and E-cadherin expression via activation of the PI3K pathway in ovarian cancer cells. Oncogene 31, 2512–2520 (2012). https://doi.org/10.1038/onc.2011.435

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