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Myc inhibition impairs autophagosome formation

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Item Type:Article
Title:Myc inhibition impairs autophagosome formation
Creators Name:Toh, P.P.C. and Luo, S. and Menzies, F.M. and Raskó, T. and Wanker, E.E. and Rubinsztein, D.C.
Abstract:Autophagy, a major clearance route for most long-lived proteins and organelles, has long been implicated in cancer development. Myc is a proto-oncogene often found to be deregulated in many cancers, and thus presents as an attractive target for design of cancer therapy. Therefore, understanding the relationship between anti-Myc strategies and autophagy will be important for development of effective therapy. Here we show that Myc depletion inhibits autophagosome formation and impairs clearance of autophagy substrates. Myc suppression has an inhibitory effect on autophagy via reduction of JNK1 and Bcl2 phosphorylation. Additionally, the decrease in JNK1 phosphorylation observed with Myc knockdown is associated with a reduction in ROS production. Our data suggest that targeting Myc in cancer therapy might have the additional benefit of inhibiting autophagy in the case of therapy resistance associated with chemotherapy-induced autophagy.
Keywords:Apoptosis, Autophagy, Gene Knockdown Techniques, HeLa Cells, Mitogen-Activated Protein Kinase 8, Molecular Targeted Therapy, Neoplasms, Neoplastic Gene Expression Regulation , Phagosomes, Phosphorylation, Proto-Oncogene Proteins c-bcl-2, Proto-Oncogene Proteins c-myc, Reactive Oxygen Species, Tumor Cell Line
Source:Human Molecular Genetics
ISSN:0964-6906
Publisher:Oxford University Press (U.K.)
Volume:22
Number:25
Page Range:5237-5248
Date:20 December 2013
Official Publication:https://doi.org/10.1093/hmg/ddt381
PubMed:View item in PubMed

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