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• W2011059273 abstract "The mitogen-activated protein kinase (MAPK) pathway has well-established roles in cellular processes including proliferation, differentiation, and regulation of cell fate, namely survival and apoptosis. In breast cancer, constitutive activation of the MAPK/extracellular signal-regulated kinases (ERK) pathways have been linked to chemoresistance and metastatic progression through distinct mechanisms including the activation of epithelial-to-mesenchymal transition (EMT). Our previous studies have shown that overexpression of MEK5 promotes EMT markers and induces the progression to a mesenchymal phenotype. Here, we tested the effects of a novel MEK1/2 and MEK5 inhibitor, SC-1-151, and other known MAPK signaling inhibitors (PD184,352 (MEK1/2), AZD6244 (MEK1/2), BIRB796 (p38)) on a panel of mesenchymal and highly metastatic breast cancer cell lines. While the MEK1/2 and p38 inhibitors decreased cell viability across cell lines, only the dual inhibition of MEK1/2 and MEK5 though the use of SC-1-151 demonstrated a change in cell morphology indicative of mesenchymal-to-epithelial transition (MET). Furthermore, the cells exhibited a significant decrease in migration potential following SC-1-151 treatment. Further analysis of the effects of SC-1-151 in the triple-negative breast cancer cell lines revealed an alteration of the genes associated with EMT, notably a decrease in expression of Fra-1, a transcription factor downstream of MAPK. Immuno-compromised mice inoculated with the MDA-MD-231 cell line and treated with SC-1-151 demonstrated decreased tumor volumes compared to vehicle-treated animals at day 30 post cell injection, implicating the role of MEK inhibition on tumorigenesis. These data demonstrate the need for a better understanding of the dual role of MEK1/2 and MEK5 signaling in breast cancer, and suggest that inhibition of the MEK1/2 and MEK5 signaling pathways leads to a decrease in EMT and cell migration. Citation Format: Van T. Hoang, Steven Elliott, Elizabeth C. Martin, Lyndsay V. Rhodes, Henry C. Segar, Hope Burks, Suravi Chakrabarty, Darlene Monlish, Theresa B. Phamduy, Doug Chrisey, Jane E. Cavanaugh, Patrick Flaherty, Bridgette M. Collins-Burow, Matthew E. Burow. Dual role of MEK1/2 and MEK5 in the reversal of epithelial-to-mesenchymal transition. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr 1052. doi:10.1158/1538-7445.AM2014-1052" @default.
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• W2011059273 date "2014-09-30" @default.
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• W2011059273 title "Abstract 1052: Dual role of MEK1/2 and MEK5 in the reversal of epithelial-to-mesenchymal transition" @default.
• W2011059273 doi "https://doi.org/10.1158/1538-7445.am2014-1052" @default.
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