KRAS Suppression-Induced Degradation of MYC Is Antagonized by a MEK5-ERK5 Compensatory Mechanism

Angelina V Vaseva, Devon R Blake, Thomas S K Gilbert, Serina Ng, Galen Hostetter, Salma H Azam, Irem Ozkan-Dagliyan, Prson Gautam, Kirsten L Bryant, Kenneth H Pearce, Laura E Herring, Haiyong Han, Lee M Graves, Agnieszka K Witkiewicz, Erik S Knudsen, Chad V Pecot, Naim Rashid, Peter J Houghton, Krister Wennerberg, Adrienne D CoxChanning J Der

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Abstract

Our recent ERK1/2 inhibitor analyses in pancreatic ductal adenocarcinoma (PDAC) indicated ERK1/2-independent mechanisms maintaining MYC protein stability. To identify these mechanisms, we determined the signaling networks by which mutant KRAS regulates MYC. Acute KRAS suppression caused rapid proteasome-dependent loss of MYC protein, through both ERK1/2-dependent and -independent mechanisms. Surprisingly, MYC degradation was independent of PI3K-AKT-GSK3β signaling and the E3 ligase FBWX7. We then established and applied a high-throughput screen for MYC protein degradation and performed a kinome-wide proteomics screen. We identified an ERK1/2-inhibition-induced feedforward mechanism dependent on EGFR and SRC, leading to ERK5 activation and phosphorylation of MYC at S62, preventing degradation. Concurrent inhibition of ERK1/2 and ERK5 disrupted this mechanism, synergistically causing loss of MYC and suppressing PDAC growth.

OriginalsprogEngelsk
TidsskriftCancer Cell
Vol/bind34
Udgave nummer5
Sider (fra-til)807-822.e1-e7
Antal sider23
ISSN1535-6108
DOI
StatusUdgivet - 2018
Udgivet eksterntJa

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Copyright © 2018 Elsevier Inc. All rights reserved.

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