The Novel Autophagy Inhibitor Alpha-Hederin Promoted Paclitaxel Cytotoxicity by Increasing Reactive Oxygen Species Accumulation in Non-Small Cell Lung Cancer Cells
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AbstractChemoresistance is a major limiting factor that impairs the outcome of non-small cell lung cancer (NSCLC) chemotherapy. Paclitaxel (Tax) induces protective autophagy in NSCLC cells, leading to the development of drug resistance. We recently identified a new autophagy inhibitor (alpha-hederin) and hypothesized that it may promote the killing effect of Tax on NSCLC cells. We found that alpha-hederin (α-Hed) could block late autophagic flux in NSCLC cells by altering lysosomal pH and inhibiting lysosomal cathepsin D maturation. Combination treatment of α-Hed and Tax synergistically reduced NSCLC cell proliferation and increased NSCLC cell apoptosis compared with treatment with α-Hed or Tax alone. Furthermore, α-Hed plus Tax enhanced the accumulation of intracellular reactive oxygen species (ROS) in NSCLC cells, while the ROS inhibitor N-acetylcysteine reversed the inhibitory effect of the combination treatment. Our findings suggest that α-Hed can increase the killing effect of Tax on NSCLC cells by promoting ROS accumulation, and that combining α-Hed with classical Tax represents a novel strategy for treating NSCLC.
All Author(s) ListZhan YJ, Wang K, Li Q, Zou YD, Chen BN, Gong Q, Ho HI, Yin T, Zhang FY, Lu YH, Wu WJ, Zhang YL, Tan YH, Du BY, Liu XD, Xiao JY
Journal nameInternational Journal of Molecular Sciences
Year2018
Month10
Volume Number19
Issue Number10
PublisherMDPI
Article number3221
ISSN1661-6596
LanguagesEnglish-United Kingdom
Keywordsalpha-hederin, autophagy inhibition, non-small cell lung cancer, chemotherapy, paclitaxel, synergistic effect
Web of Science Subject CategoriesBiochemistry & Molecular Biology;Chemistry, Multidisciplinary;Biochemistry & Molecular Biology;Chemistry

Last updated on 2021-17-04 at 00:34