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Learn MoreSepantronium bromide (YM155), a transcriptional inhibitor of anti-apoptotic protein survivin, is considered as a potential drug candidate for triple negative breast cancers (TNBC). Regardless of its excellent performance in pre-clinical models of TNBC, in patients, this drug was unable to outperform the standard chemotherapy docetaxel. The goal of this study was to identify the pathways/molecules affected by YM155 in TNBC cell lines. Detailed biochemical analysis of the paired YM155-sensitive and resistant cell lines indicates that induction of mitochondrial oxidative stress is a first-line response to the drug, ultimately leading to growth inhibition and induction of cell death. Multiple pathways involved in dampening oxidative stress-induced damages are differentially regulated in YM155-resistant cells. Furthermore, the emergence of YM155 resistance is associated with an extensive transcriptional reprogramming and alteration of many more biological pathways in addition to those identified by biochemical assays. Molecules associated with these biological pathways will potentially serve as biomarkers predicting YM155 sensitivity in TNBC cells. SOURCE: Anindita Chakrabarty (abanti_ac@yahoo.com) - A321J Shiv Nadar University
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