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• W2062034356 abstract "Transforming growth factor (ß1TGFß1) can promote proliferation in late stage cancers but acts as a tumor suppressor in normal epithelial cells and in early stage cancers. Although, the TGFß pathway has been shown to play a key role in tumorigenesis and metastasis, only a limited number of models have been developed to understand this process. Here, we present a novel model system to discern this paradoxical role of TGFß1 using the MDA-MB-231 (MB-231) cell line. The MB-231 triple-negative breast cancer cell line has been extensively characterized and has been shown to continue to proliferate and undergo epithelial-to-mesenchymal transition (EMT) upon TGFß1 stimulation. We have previously shown by microarray analysis that expression of GATA3 in MB-231 cells results in reprogramming of these cells from a basal to a luminal subtype associated with a reduction of metastasis and tumorigenesis when implanted as xenografts. We now demonstrate that GATA3 overexpression in these cells results in a reduction of TGFß1 response, reversal of EMT, and most importantly, restoration of sensitivity to the inhibitory effects on proliferation of TGFß1. Microarray analysis revealed that TGFß1 treatment resulted in reduction of several cell cycle effectors in 231-GATA3 cells but not in control cells. Furthermore, our microarray analysis revealed a significant increase of BMP5 in 231-GATA3 cells. We demonstrate that combined treatment of MB-231 control cells with TGFß1 and BMP5 results in a significant reduction of cellular proliferation. Thus, this model offers a means to further investigate potentially novel mechanisms involved in the switch in response to TGFß1 from tumor promoter to tumor suppressor through the reprogramming of a triple-negative breast cancer cell line by the GATA3 transcription factor." @default.
• W2062034356 created "2016-06-24" @default.
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• W2062034356 date "2013-04-08" @default.
• W2062034356 modified "2023-10-11" @default.
• W2062034356 title "Expression of GATA3 in MDA-MB-231 Triple-negative Breast Cancer Cells Induces a Growth Inhibitory Response to TGFß" @default.
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• W2062034356 doi "https://doi.org/10.1371/journal.pone.0061125" @default.
• W2062034356 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3620110" @default.
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