Abstract
High activation of the PI3K–AKT–mTOR pathway is characteristic for T-cell acute lymphoblastic leukemia (T-ALL). The activity of the master regulator of this pathway, PTEN, is often impaired in T-ALL. However, experimental evidence suggests that input from receptor tyrosine kinases (RTKs) is required for sustained mTOR activation, even in the absence of PTEN. We previously reported the expression of Neurotrophin receptor tyrosine kinases (TRKs) and their respective ligands in primary human leukemia samples. In the present study we aimed to dissect the downstream signaling cascades of TRK-induced T-ALL in a murine model and show that T-ALLs induced by deregulated receptor tyrosine kinase signaling acquire activating mutations in Notch1 and lose PTEN during clonal evolution. Some clones additionally lost one allele of the homeodomain transcription factor Cux1. All events independently led to a gradual hyperactivation of both mTORC1 and mTORC2 signaling. We dissected the role of the individual mTOR complexes by shRNA knockdown and found that the separate depletion of mTORC1 or mTORC2 reduced the growth of T-ALL blasts, but was not sufficient to induce apoptosis. In contrast, knockdown of the mTOR downstream effector eIF4E caused a striking cytotoxic effect, demonstrating a critical addiction to cap-dependent mRNA-translation. Although high mTORC2–AKT activation is commonly associated with drug-resistance, we demonstrate that T-ALL displaying a strong mTORC2–AKT activation were specifically susceptible to 4EGI-1, an inhibitor of the eIF4E–eIF4G interaction. To decipher the mechanism of 4EGI-1, we performed a genome-wide analysis of mRNAs that are translationally regulated by 4EGI-1 in T-ALL. 4EGI-1 effectively reduced the ribosomal occupancy of mRNAs that were strongly upregulated in T-ALL blasts compared with normal thymocytes including transcripts important for translation, mitochondria and cell cycle progression, such as cyclins and ribosomal proteins. These data suggest that disrupting the eIF4E–eIF4G interaction constitutes a promising therapy strategy in mTOR-deregulated T-cell leukemia.
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Acknowledgements
AS was supported by the Hannover Biomedical Research School (HBRS) and the MD-PhD program ‘Molecular Medicine’. We thank Dr Jan Cools, Center for Human Genetics, KULeuven, Leuven for the MOHITO cell line. We thank Dr Phillip Ivanyi and Professor Anke Franzke, Department of Hematology, MHH for providing human T-ALL cell lines. We thank Rena-Mareike Struss, Institute of Experimental Hematology, Hannover Medical School for help with mouse experiments and Anneke Doerrie, Institute of Biochemistry, for assistance in polysome profiling experiments. We thank Axel Schambach, Institute of Experimental Hematology, for providing pRSF91.IRES.dTomato and pRRL.PPT.SF.IRES.EGFP. WPRE vectors. We thank Thomas Neumann and Maike Stahlhut for performing the microarray experiments. We thank the Cell Sorting Unit of Hannover Medical School for performing sorting experiments and Michael Morgan for proofreading the manuscript. This work was supported by the Deutsche Krebshilfe (grants: 108245 and 109800), the Deutsche José Carreras Leukämie-Stiftung (grant: DJCLS F10/06), the Deutsche Forschungsgemeinschaft (grants: Li 1608/2-1 and SFB738) and the DFG-Cluster of Excellence REBIRTH.
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Schwarzer, A., Holtmann, H., Brugman, M. et al. Hyperactivation of mTORC1 and mTORC2 by multiple oncogenic events causes addiction to eIF4E-dependent mRNA translation in T-cell leukemia. Oncogene 34, 3593–3604 (2015). https://doi.org/10.1038/onc.2014.290
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DOI: https://doi.org/10.1038/onc.2014.290
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