Abstract
The most frequent chromosomal translocations in pediatric acute myeloid leukemia affect the 11q23 locus and give rise to mixed lineage leukemia (MLL) fusion genes, MLL-AF9 being the most prevalent. The MLL-AF9 fusion gene has been shown to induce leukemia in both mouse and human models. In this study, we demonstrate that leukemogenic activity of MLL-AF9 requires RUVBL2 (RuvB-like 2), an AAA+ ATPase family member that functions in a wide range of cellular processes, including chromatin remodeling and transcriptional regulation. Expression of RUVBL2 was dependent on MLL-AF9, as it increased upon immortalization of human cord blood-derived hematopoietic progenitor cells with the fusion gene and decreased following loss of fusion gene expression in conditionally immortalized mouse cells. Short hairpin RNA-mediated silencing experiments demonstrated that both the immortalized human cells and the MLL-AF9-expressing human leukemia cell line THP-1 required RUVBL2 expression for proliferation and survival. Furthermore, inhibition of RUVBL2 expression in THP-1 cells led to reduced telomerase activity and clonogenic potential. These data were confirmed with a dominant-negative Walker B-mutated RUVBL2 construct. Taken together, these data suggest the possibility of targeting RUVBL2 as a potential therapeutic strategy for MLL-AF9-associated leukemia.
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Acknowledgements
This research was supported by grants from Leukaemia and Lymphoma Research, United Kingdom (Project Grant 08019 to JdeB and OW; European Visiting Fellowship 07039 to SJH), the Great Ormond Street Hospital Children’s Charity (ICH22 to HO and MM; and W1055 to VW-V) and the Medical Research Council (MRC Doctoral Training Grant to LZ), AIRC and MIUR (PRIN) funds (to GM). We are grateful to D. Trono, Lausanne and Y. Takeuchi, London, for envelope constructs, and D.C. Tkachuk, Toronto, for the MLL-AF9 cDNA. We thank Mike Hubank, Kerra Pearce and Nipurna Jina (UCL Genomics) for help with gene expression analysis, Ayad Eddaoudi (UCL ICH Flow Cytometry Facility) for providing assistance with flow cytometry and all the staff of the UCL ICH Western Laboratories for excellent animal husbandry.
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Osaki, H., Walf-Vorderwülbecke, V., Mangolini, M. et al. The AAA+ ATPase RUVBL2 is a critical mediator of MLL-AF9 oncogenesis. Leukemia 27, 1461–1468 (2013). https://doi.org/10.1038/leu.2013.42
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DOI: https://doi.org/10.1038/leu.2013.42
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