A non-transcriptional role for the glucocorticoid receptor in mediating the cell stress response

Marina Ptushkina, Toryn Poolman, Mudassar Iqbal, Mark Ashe, Janni Petersen, Joanna Woodburn, Magnus Rattray, Anthony Whetton, David Ray

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    Abstract

    The glucocorticoid receptor (GR) is essential for the stress response in mammals. We investigated potential non-transcriptional roles of GR in cellular stress response using fission yeast as a model.We surprisingly discovered marked heat stress resistance in yeast ectopically expressing human GR, which required expression of both the N-terminal transactivation domain, and the C-terminal ligand binding domain, but not the DNA-binding domain of the GR. This effect was not affected by GR ligand exposure, and occurred without significant GR nuclear accumulation. Mechanistically, the GR survival effect required Hsp104, and, indeed, GR expression increased Hsp104 expression. Proteomic analysis revealed GR binding to translasome components, including eIF3, a known partner for Sty1, a pattern of protein interaction which we confirmed using yeast two-hybrid studies.Taken together, we find evidence for a novel pathway conferring stress resistance in yeast that can be activated by the human GR, acting by protein-protein mechanisms in the cytoplasm. This suggests that in organisms where GR is natively expressed, GR likely contributes to stress responses through non-transcriptional mechanisms in addition to its well-established transcriptional responses.

    Original languageEnglish
    Article number12101
    Number of pages12
    JournalScientific Reports
    Volume7
    Issue number1
    DOIs
    Publication statusPublished - 2017

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    Ptushkina, M., Poolman, T., Iqbal, M., Ashe, M., Petersen, J., Woodburn, J., Rattray, M., Whetton, A., & Ray, D. (2017). A non-transcriptional role for the glucocorticoid receptor in mediating the cell stress response. Scientific Reports, 7(1), [12101]. https://doi.org/10.1038/s41598-017-09722-z