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Oncogenes, Fusion Genes and Tumor Suppressor Genes

Bmi1 is essential for leukemic reprogramming of myeloid progenitor cells

Abstract

The polycomb group (PcG) proteins, particularly Bmi1, have an essential role in maintaining the self-renewing capacity of leukemic stem cells (LSCs). Although one of their major targets in LSCs is known to be the Ink4a/Arf tumor suppressor gene locus, the role of PcG proteins in the leukemic reprogramming of target cells into LSCs is not well characterized. In this study, Bmi1−/− granulocyte/macrophage progenitors (GMPs) were transformed with the leukemic fusion gene MLL–AF9. Although Bmi1 was not essential to the immortalization of GMPs in vitro, Bmi1−/− cells showed enhanced differentiation and retained less LSCs. A number of genes were derepressed in the absence of Bmi1 including potential tumor suppressor genes. Transplantation assays demonstrated that Bmi1 was indispensable for the development of leukemia in vivo and deletion of both the Ink4a and Arf genes only partially restored the leukemogenic capacity of Bmi1−/− LSCs. Of note, the complementation of immortalized Bmi1−/−Ink4a-Arf−/− GMPs with Bmi1 failed to restore the expression of the majority of deregulated genes and leukemogenic activity in vivo. These findings indicate that Bmi1 is essential for the faithful reprogramming of myeloid progenitors into LSCs and unveil that leukemic fusion genes require PcG proteins exerting an effect in concert to establish LSC-specific transcriptional profiles, which confer full leukemogenic activity on LSCs.

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Acknowledgements

We thank Maarten van Lohuizen and Ronald A DePinho for providing Bmi1+/− mice and Ink4a+/− mice, respectively, and Lay Hess for the MLL-AF9 plasmid. This study was supported in part by Grants-in-aid for Scientific Research (#21390289) and for the Global COE Program (Global Center for Education and Research in Immune System Regulation and Treatment), MEXT, Japan, a Grant-in-aid for Core Research for Evolutional Science and Technology (CREST) from the Japan Science and Technology Corporation (JST), and a grant from the Takeda Science Foundation.

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Correspondence to A Iwama.

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JY designed and conducted the research, performed experiments, interpreted the data, and wrote the paper; MT, MN and HO conducted research; HI performed the microarray analysis; and AI was responsible for execution of the research, interpretation of the data and the writing of the paper.

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Yuan, J., Takeuchi, M., Negishi, M. et al. Bmi1 is essential for leukemic reprogramming of myeloid progenitor cells. Leukemia 25, 1335–1343 (2011). https://doi.org/10.1038/leu.2011.85

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