Abstract
Resistance to apoptosis in acute myeloid leukemia (AML) cells causes refractory or relapsed disease, associated with dismal clinical outcomes. Ferroptosis, a mode of non-apoptotic cell death triggered by iron-dependent lipid peroxidation, has been investigated as potential therapeutic modality against therapy-resistant cancers, but our knowledge of its role in AML is limited. We investigated ferroptosis in AML cells and identified its mitochondrial regulation as a therapeutic vulnerability. GPX4 knockdown induced ferroptosis in AML cells, accompanied with characteristic mitochondrial lipid peroxidation, exerting anti-AML effects in vitro and in vivo. Electron transport chains (ETC) are primary sources of coenzyme Q10 (CoQ) recycling for its function of anti–lipid peroxidation in mitochondria. We found that the mitochondria-specific CoQ potently inhibited GPX4 inhibition–mediated ferroptosis, suggesting that mitochondrial lipid redox regulates ferroptosis in AML cells. Consistently, Rho0 cells, which lack functional ETC, were more sensitive to GPX4 inhibition–mediated mitochondrial lipid peroxidation and ferroptosis than control cells. Furthermore, degradation of ETC through hyperactivation of a mitochondrial protease, caseinolytic protease P (ClpP), synergistically enhanced the anti-AML effects of GPX4 inhibition. Collectively, our findings indicate that in AML cells, GPX4 inhibition induces ferroptosis, which is regulated by mitochondrial lipid redox and ETC.
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Data availability
All data generated during this study are included in this published article and its supplementary files. Additional data are available from the corresponding author upon reasonable request.
Change history
08 March 2024
A Correction to this paper has been published: https://doi.org/10.1038/s41375-024-02202-0
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Acknowledgements
The authors thank Kenneth Dunner Jr., (MD Anderson Cancer Center High Resolution Electron Microscopy Facility) for assisting with transmission electron microscopy experiments, Manu M Sebastian (MD Anderson Cancer Center Department of Veterinary Medicine and Surgery) for assisting with in vivo experiments, M.L.P. 2nd was supported by the 1R25CA240137 UPWARDS Training Program and the CPRIT Research Training Award CPRIT Training Program (RP210028), Steffen Boettcher (University of Zurich, Zurich, Switzerland) for providing cell lines, Joseph A Munch (MD Anderson Cancer Center Science Medical Library) for editing the manuscript, and Boyi Gan (MD Anderson Cancer Center Department of Experimental Radiation Oncology) for reviewing the manuscript. This work was supported in part by Japan Cancer Society Relay For Life My Oncology Dream Award (HA), The Mochida Memorial Foundation for Medical and Pharmaceutical Research (HA), The Uehara Memorial Foundation Research Fellowship (HA), TRIUMPH fellowship in the Cancer Prevention Research Institution of Texas (CPRIT) Training Program RP210028 (EA), Paul & Mary Haas Chair in Genetics (MA), NIH/NCI R41 CA275631 (MA), FDA R01 FD006118 (MA and JI) Leukemia SPORE P50 CA100632 Development Research Program (MA and JI), MD Anderson Multidisciplinary Research Program (MA and JI), MD Anderson Cancer Center Institutional Research Grant (JI), the Department of Defense CA220581 (JI), New Investigator Research Grant Program from Leukemia Research Foundation (JI), and various donor funds (MA). Part of the study was performed in the Flow Cytometry & Cellular Imaging Core Facility and High Resolution Electron Microscopy Facility at MD Anderson Cancer Center, which is supported in part by NCI Cancer Center Support Grant P30CA16672. The animal study was supported in part by the MD Anderson Cancer Center Support Grant CA016672 including animal housing and care in the Research Animal Support Facility (RASF). Imipridones ONC201 and ONC212 were kindly provided from Chimerix (Durham, NC).
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HA, MA, and JI designed and conceptualized the study. HA and JI designed experiments. HA, RZ, MT, SJY, AM, MLPII, and NB performed in vitro experiments and analyzed data. HA, RZ, LBO, SJY, AM, and SS performed in vivo experiments and analyzed data. HA, RZ, MT, SS, NB, ADS, MA, and JI interpreted the data and draw the conclusions. YN, PYM, and VRR provided technical and material supports of experiments. ZL and EA performed statistical analyses. HA and JI wrote the manuscript. MT, BZC, ADS, MA, and JI reviewed/revised the manuscript. All authors read and approved the final paper.
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MA is a stockholder of Chimerix. JI, MA, and ADS have filed invention disclosure forms related to the use of imipridones in cancers. ADS has received research funding from Takeda Pharmaceuticals, BMS and Medivir AB, and consulting fees/honorarium from Takeda, Novartis, Jazz, and Otsuka Pharmaceuticals. ADS is named on a patent application for the use of DNT cells to treat AML. ADS is a member of the Medical and Scientific Advisory Board of the Leukemia and Lymphoma Society of Canada.
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The mouse studies were performed following the guidelines approved by the Institutional Animal Care and Use Committees at MD Anderson Cancer Center. Primary samples were obtained from AML patients and hematopoietic stem cell donors after acquiring written informed consent following MD Anderson Cancer Center Institutional Review Board protocol and in accordance with the Declaration of Helsinki.
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The original online version of this article was revised: In this article the funding from M.L.P. 2nd was supported by the 1R25CA240137 UPWARDS Training Program and the CPRIT Research Training Award CPRIT Training Program (RP210028) was omitted.
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Akiyama, H., Zhao, R., Ostermann, L.B. et al. Mitochondrial regulation of GPX4 inhibition–mediated ferroptosis in acute myeloid leukemia. Leukemia 38, 729–740 (2024). https://doi.org/10.1038/s41375-023-02117-2
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DOI: https://doi.org/10.1038/s41375-023-02117-2