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Journal Article
Research Support, Non-U.S. Gov't
BCL2 induced by LAMTOR3/MAPK is a druggable target of chemoradioresistance in mesenchymal lung cancer.
Cancer Letters 2017 September 11
Mesenchymal-type cancers after epithelial mesenchymal transition (EMT) were recently shown to acquire chemoresistance through expressing EMT specific transcription factors. However, druggable (or actionable) target(s) for chemoresistance in mesenchymal-type lung cancers remain unidentified. Here, we used a public clinical genomic database and mesenchymal lung cancer cells (MLCC) model derived from the A549 lung adenocarcinoma cell line to demonstrate that BCL2 expression, which is highly induced in mesenchymal-type lung cancers, as a predictor of poor prognosis in mesenchymal lung cancer patients and association with acquired chemoradioresistance. Thereby, combination treatment with BH3 mimetics, such as ABT-263 and ABT-737, clearly attenuated chemoresistance in MLCCs. BCL2 expression in MLCCs was induced by ERK1 activity through the upregulation of the MEK1/ERK1 scaffold protein MEK partner-1 (MP1). Interfering with the MEK1/MP1/ERK1 axis using a MEK1 inhibitor or MP1 depletion repressed BCL2 expression and sensitized MLCCs to chemoradiotherapy. Taken together, our results suggest that targeting druggable proteins in the MEK1/MP1/ERK1/BCL2 axis, such as MEK1 or BCL2, with currently available FDA approved drugs is a currently feasible approach to improve clinical outcomes of mesenchymal lung cancer patients.
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