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    Glucocorticoid resistance of migration and gene expression in a daughter MDA-MB-231 breast tumour cell line selected for high metastatic potential

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    Author
    Fietz, ER; Keenan, CR; Lopez-Campos, G; Tu, Y; Johnstone, CN; Harris, T; Stewart, AG
    Date
    2017-03-06
    Source Title
    Scientific Reports
    Publisher
    NATURE PUBLISHING GROUP
    University of Melbourne Author/s
    Johnstone, Cameron; Lopez Campos, Guillermo; Stewart, Alastair; Keenan, Christine; Fietz, Ebony; Tu, Yun; Harris, Trudi
    Affiliation
    Pharmacology and Therapeutics
    Clinical Pathology
    Bio21
    Metadata
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    Document Type
    Journal Article
    Citations
    Fietz, E. R., Keenan, C. R., Lopez-Campos, G., Tu, Y., Johnstone, C. N., Harris, T. & Stewart, A. G. (2017). Glucocorticoid resistance of migration and gene expression in a daughter MDA-MB-231 breast tumour cell line selected for high metastatic potential. SCIENTIFIC REPORTS, 7 (1), https://doi.org/10.1038/srep43774.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/258305
    DOI
    10.1038/srep43774
    Abstract
    Glucocorticoids are commonly used to prevent chemotherapy-induced nausea and vomiting despite a lack of understanding of their direct effect on cancer progression. Recent studies suggest that glucocorticoids inhibit cancer cell migration. However, this action has not been investigated in estrogen receptor (ER)-negative breast tumour cells, although activation of the glucocorticoid receptor (GR) is associated with a worse prognosis in ER-negative breast cancers. In this study we have explored the effect of glucocorticoids on the migration of the ER-negative MDA-MB-231 human breast tumour cell line and the highly metastatic MDA-MB-231-HM.LNm5 cell line that was generated through in vivo cycling. We show for the first time that glucocorticoids inhibit 2- and 3-dimensional migration of MDA-MB-231 cells. Selection of cells for high metastatic potential resulted in a less migratory cell phenotype that was resistant to regulation by glucocorticoids and showed decreased GR receptor expression. The emergence of glucocorticoid resistance during metastatic selection may partly explain the apparent disparity between the clinical and in vitro evidence regarding the actions of glucocorticoids in cancer. These findings highlight the highly plastic nature of tumour cells, and underscore the need to more fully understand the direct effect of glucocorticoid treatment on different stages of metastatic progression.

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