Abstract
Steroid hormones and their nuclear receptors play a major role in the development and progression of breast cancer. MCF-7 cells are triple-positive breast cancer cells expressing estrogen receptor (ER), progesterone receptor (PR), and glucocorticoid receptor (GR). However, interaction and their role in expression pattern of activator protein (AP-1) transcription factors (TFs) are not completely understood. Hence, in our study, MCF-7 cells were used as an in vitro model system to study the interplay between the receptors and hormones. MCF-7 cells were treated with estradiol-17β (E2), progesterone (P4), and dexamethasone (Dex), alone or in combination, to study the proliferation of cells and expression of AP-1 genes. MTT assay results show that E2 or P4 induced the cell proliferation by more than 35 %, and Dex decreased the proliferation by 26 %. E2 and P4 are found to increase ERα by more than twofold and c-Jun, c-Fos, and Fra-1 AP-1 TFs by more than 1.7-fold, while Dex shows opposite effect of E2- or P4-induced effect as well as effect on the expression of nuclear receptors and AP-1 factors. E2 antagonist Fulvestrant (ICI 182,780) found to reduce proliferation and E2-induced expression of AP1-TFs, while P4 or Dex antagonist Mifepristone (RU486) is found to block GR-mediated expression of NRs and AP-1 mRNAs. Results suggest that E2 and P4 act synergistically, and Dex acts as an antagonist of E2 and P4.
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Acknowledgments
The authors wish to express their gratitude to the Department of Science and Technology-Promotion of University Research and Scientific Excellence (DST-PURSE) [SR/59/Z-23/2010/38(c)] and University Grant Commission Centre with Potential for Excellence in Particular Area (UGC-CPEPA) [8-2/2008(NS/PE)], New Delhi for providing financial support. The authors also wish to express their gratitude to the Department of Microbiology and Biotechnology, Bangalore University, Bengaluru for providing the DST-FIST, UGC-SAP, and department facility.
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Hegde, S.M., Kumar, M.N., Kavya, K. et al. Interplay of nuclear receptors (ER, PR, and GR) and their steroid hormones in MCF-7 cells. Mol Cell Biochem 422, 109–120 (2016). https://doi.org/10.1007/s11010-016-2810-2
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DOI: https://doi.org/10.1007/s11010-016-2810-2