Dysregulation of the PI3K-AKT-mTOR signaling network is a prominent feature of breast cancers. However, clinical responses to drugs targeting this pathway have been modest, possibly because of dynamic changes in cellular signaling that drive resistance and limit drug efficacy. Using a quantitative chemoproteomics approach, we mapped kinome dynamics in response to inhibitors of this pathway and identified signaling changes that correlate with drug sensitivity. Maintenance of AURKA after drug treatment was associated with resistance in breast cancer models. Incomplete inhibition of AURKA was a common source of therapy failure, and combinations of PI3K, AKT or mTOR inhibitors with the AURKA inhibitor MLN8237 were highly synergistic and durably suppressed mTOR signaling, resulting in apoptosis and tumor regression in vivo. This signaling map identifies survival factors whose presence limits the efficacy of targeted therapies and reveals new drug combinations that may unlock the full potential of PI3K–AKT–mTOR pathway inhibitors in breast cancer.
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The authors would like to thank members of the Bandyopadhyay laboratory for helpful discussions and technical assistance. We also thank A. Beardsley, E. Markegard, D. Ruggero and W. Weiss for helpful discussions and reagents. This work was supported in part by NCI U01CA168370 (S.B.), NIGMS R01GM107671 (S.B.), NCI R01CA170447 (A.G.), Prospect Creek Foundation (S.B., A.G.), OHSU Pilot Project Funding (S.B., J.K.), American Cancer Society Postdoctoral Fellowship (J.D.G.), the Gazarian Foundation (A.G.), DOD W81XWH-12-1-0272 and DOD W81XWH-16-1-0603 (A.G.).
The authors declare no competing interests.
Publisher’s note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Supplementary Figures 1–19
Kinase activity scores and P values from MIBs/MS profiling.
Gene set enrichment analysis (GSEA) of BYL719-treated cells.
Receptor status, synergy scores (Loewe and Bliss) and assessment of increase in apoptosis over single-agent or combinations tested in this study.
MYC signature derived from isogenic MCF10A cell lines.
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Donnella, H.J., Webber, J.T., Levin, R.S. et al. Kinome rewiring reveals AURKA limits PI3K-pathway inhibitor efficacy in breast cancer. Nat Chem Biol 14, 768–777 (2018). https://doi.org/10.1038/s41589-018-0081-9
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