Abstract
Historically, our understanding of mechanisms underlying human leukemogenesis are inferred from genetically engineered mouse models. Relatively, few models that use primary human cells recapitulate the full leukemic transformation as assayed in xenografts and myeloid transformation is infrequent. We report a humanized experimental leukemia model where xenografts develop aggressive acute myeloid leukemia (AML) with disseminated myeloid sarcomas within 4 weeks following transplantation of cord blood transduced with vectors expressing BCR-ABL1 and a dominant-negative isoform of IKAROS, Ik6. Ik6 induced transcriptional programs in BCR-ABL1-transduced progenitors that contained repressed B-cell progenitor programs, along with strong stemness, proliferation and granulocyte–monocytic progenitor (GMP) signatures—a novel combination not induced in control groups. Thus, wild-type IKAROS restrains stemness properties and has tumor suppressor activity in BCR-ABL1-initiated leukemia. Although IKAROS mutations/deletions are common in lymphoid transformation, they are found also at low frequency in AML that progress from a prior myeloproliferative neoplasm (MPN) state. Our experimental system provides an excellent model to gain insight into these rare cases of AML transformation and the properties conferred by IKAROS loss of function as a secondary mutation. More generally, our data points to the importance of deregulated stemness/lineage commitment programs in human myeloid leukemogenesis.
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Acknowledgements
We thank S. Bashir (PMH and OICR) for statistical analyses, Goce Bogdanoski for phospho-flow analysis and Olga I. Gan for technical assistance. This work was supported by funds to JED from: The Princess Margaret Cancer Centre Foundation, Ontario Institute for Cancer Research with funding from the Province of Ontario, Canadian Institutes for Health Research, Canadian Cancer Society Research Institute, Terry Fox Foundation, Genome Canada through the Ontario Genomics Institute and a Canada Research Chair. Funding was also provided by the Swiss Cancer League and the Swiss National Science Foundation (APAT, EL), Roche (EL) and FSBMB (EL). This research was funded in part by the Ontario Ministry of Health and Long Term Care (OMOHLTC). The views expressed do not necessarily reflect those of the OMOHLTC.
Author contributions
APAT and SMD performed research, analyzed data and wrote the paper; FN, and P-YC, performed research; JSY performed research and analyzed data; EL analyzed data and edited the paper; VV and ET analyzed data; CJG, MDM and CGM provided essential reagents; JED designed research, analyzed data and wrote the paper.
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Theocharides, A., Dobson, S., Laurenti, E. et al. Dominant-negative Ikaros cooperates with BCR-ABL1 to induce human acute myeloid leukemia in xenografts. Leukemia 29, 177–187 (2015). https://doi.org/10.1038/leu.2014.150
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DOI: https://doi.org/10.1038/leu.2014.150
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