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Transcriptional Control and Signal Transduction

Direct interaction of PU.1 with oncogenic transcription factors reduces its serine phosphorylation and promoter binding

A Corrigendum to this article was published on 07 November 2012

Abstract

The homeostasis of hematopoiesis in the bone marrow is governed by a small number of key transcription factors, including PU.1, GATA-1 and c/EBPα. PU.1, a member of the E-twenty-six family of transcription factors, is indispensable for normal hematopoiesis. Inactivation of PU.1 induces acute leukemia in mice. Recent data suggest that the leukemia-associated fusion protein pro-myelocytic leukemia/retinoic acid receptor alpha (PML/RARα) inhibits PU.1, but the mechanism mediating this inhibition is unclear. Here, we investigated the mechanisms by which the fusion proteins PML/RARα and pro-myelocytic leukemia zinc finger/RARα (PLZF/RARα) (X-RARα) interfere with the function of PU.1. We found that X-RARα proteins functionally inactivate PU.1 by reducing its promoter-binding capacity, resulting in a reduction in PU.1-dependent transcriptional transactivation. In fact, X-RARα proteins directly interact with PU.1, leading to both the sequestration of PU.1 from its target promoters and a reduction in its serine phosphorylation, which is crucial for its promoter binding and transcriptional activity. We found that the functional inactivation of PU.1 could be overcome by the forced overexpression of PU.1 in PML/RARα- or PLZF/RARα-positive murine hematopoietic progenitor cells; evidently, this overexpression rescued the leukemic differentiation block induced by X-RARα proteins. Our data thus provide strong evidence that X-RARα proteins functionally inhibit PU.1, shedding light on the mechanism by which X-RARα proteins induce leukemogenesis.

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Acknowledgements

EP was supported by the Deutsche Forschungsgemeinschafft Transregio 17 Project N01 and the ‘Deutsche Krebshilfe e.V’ (Grant 108693). AS was supported by a fellowship from the ‘Deutsche José Carreras Leukämie-Stiftung e.V’ (DJCLS F 06/07). This work was also supported by the ‘Paul und Ursula Klein—Stiftung’ and ‘Marie-Christine Held und Erika Hecker—Stiftung’ donations. We thank Dr Martin Ruthardt and Dr Frank Rosenbauer for critical reading of the manuscript.

AUTHOR CONTRIBUTIONS

EP designed the research, analyzed the data and wrote the paper. AS and TR performed the experiments and analyzed the data. MF, SB and HH performed the experiments.

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Correspondence to E Puccetti.

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Seshire, A., Rößiger, T., Frech, M. et al. Direct interaction of PU.1 with oncogenic transcription factors reduces its serine phosphorylation and promoter binding. Leukemia 26, 1338–1347 (2012). https://doi.org/10.1038/leu.2011.331

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