Abstract
Resistance of acute myeloid leukemia (AML) to therapeutic agents is frequent. Consequently, the mechanisms leading to this resistance must be understood and addressed. In this paper, we demonstrate that inhibition of deubiquitinylase USP7 significantly reduces cell proliferation in vitro and in vivo, blocks DNA replication progression and increases cell death in AML. Transcriptomic dataset analyses reveal that a USP7 gene signature is highly enriched in cells from AML patients at relapse, as well as in residual blasts from patient-derived xenograft (PDX) models treated with clinically relevant doses of cytarabine, which indicates a relationship between USP7 expression and resistance to therapy. Accordingly, single-cell analysis of AML patient samples at relapse versus at diagnosis showed that a gene signature of the pre-existing subpopulation responsible for relapse is enriched in transcriptomes of patients with a high USP7 level. Furthermore, we found that USP7 interacts and modulates CHK1 protein levels and functions in AML. Finally, we demonstrated that USP7 inhibition acts in synergy with cytarabine to kill AML cell lines and primary cells of patients with high USP7 levels. Altogether, these data demonstrate that USP7 is both a marker of resistance to chemotherapy and a potential therapeutic target in overcoming resistance to treatment.
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Acknowledgements
We would like to sincerely thank Thomas Farge for his technical support during in vivo experiments and Alison Boutet for technical assistance. We thank Laetitia Ligat and Dr Marie Tosolini at the CRCT microscopy facility and Manon Farcé at the CRCT cytometry facility for their helpful discussions of the analyses and the development of macro used in the ImageJ software. We gratefully acknowledge Dr Ze’ev Ronai for the critical review of the manuscript, and sincerely thank all members of the “Cell Cycle and Cancer” team for their critical review during the entire study. The authors sincerely thank Chloé Laplagne for the technical PBMC preparation and Dr Marie Jeanne Pillaire for insightful discussions on DNA fiber spreading experiments. Maëlle Cartel is a recipient of a fellowship from the Ligue Nationale contre le Cancer. We are grateful to our healthcare professionals for their boundless investment during the COVID-19 crisis.
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MC, PLM, MG, LD, JES, SM, and CD conceived and designed the study; MC, PLM, MG, LD, and CD performed experiments; SB and VMDM. contributed clinical samples; MC, AB, JES, SM, and CD wrote the manuscript; AB, JES, SM, and CD insured administrative, technical and material support; SM and CD supervised the project.
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Cartel, M., Mouchel, PL., Gotanègre, M. et al. Inhibition of ubiquitin-specific protease 7 sensitizes acute myeloid leukemia to chemotherapy. Leukemia 35, 417–432 (2021). https://doi.org/10.1038/s41375-020-0878-x
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DOI: https://doi.org/10.1038/s41375-020-0878-x
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