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• W2959553016 endingPage "114662" @default.
• W2959553016 startingPage "114662" @default.
• W2959553016 abstract "Although osimertinib, an EGFR tyrosine kinase inhibitor, has become the standard therapy for treating non-small cell lung cancer (NSCLC) patients with EGFR-activating mutation, upregulation of MCL-1 induces acquired resistance to osimertinib. Bufalin, a natural digoxin-like ingredient isolated from a traditional Chinese medicine Chan Su, has been shown to downregulate MCL-1 in NSCLC cells. However, whether bufalin reverses this acquired resistance to osimertinib in NSCLC cells remains unclear. In this study, bufalin reduced cell viability and promoted apoptosis in osimertinib-resistant cells. Moreover, co-treatment with bufalin and osimertinib restored the sensitivity of osimertinib-resistant cells to osimertinib-induced growth regression and apoptosis in vitro and in vivo. Mechanistically, MEK/ERK-dependent MCL-1 phosphorylation and Ku70-mediated MCL-1 overexpression confer osimertinib resistance in EGFR-mutant NSCLC cells. In osimertinib-resistant cells, bufalin modulates Ku70-mediated MCL-1 degradation, but not MEK/ERK/MCL-1 signaling. In conclusion, our study suggests that bufalin eliminates resistance to osimertinib by inhibiting Ku70-mediated MCL-1 overexpression, indicating that a combination of osimertinib and bufalin could be an effective additional treatment to overcome acquired resistance to osimertinib in NSCLC cells." @default.
• W2959553016 created "2019-07-23" @default.
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• W2959553016 date "2019-09-01" @default.
• W2959553016 modified "2023-10-16" @default.
• W2959553016 title "Degradation of MCL-1 by bufalin reverses acquired resistance to osimertinib in EGFR-mutant lung cancer" @default.
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• W2959553016 doi "https://doi.org/10.1016/j.taap.2019.114662" @default.
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