Abstract
We investigated the role of microRNAs (miRNA) 17-5p, 20a and 106a in monocytic differentiation and maturation. In unilineage monocytic culture generated by haematopoietic progenitor cells these miRNAs are downregulated, whereas the transcription factor acute myeloid leukaemia-1 (AML1; also known as Runt-related transcription factor 1, Runx1) is upregulated at protein but not mRNA level. As miRNAs 17-5p, 20a and 106a bind the AML1 mRNA 3′UTR, their decline may unblock AML1 translation. Accordingly, transfection with miRNA 17-5p–20a–106a suppresses AML1 protein expression, leading to M-CSF receptor (M-CSFR) downregulation, enhanced blast proliferation and inhibition of monocytic differentiation and maturation. Treatment with anti-miRNA 17-5p, 20a and 106a causes opposite effects. Knockdown of AML1 or M-CSFR by short interfering RNA (siRNA) mimics the action of the miRNA 17-5p–20a–106a, confirming that these miRNAs target AML1, which promotes M-CSFR transcription. In addition, AML1 binds the miRNA 17-5p–92 and 106a–92 cluster promoters and transcriptionally inhibits the expression of miRNA 17-5p–20a–106a. These studies indicate that monocytopoiesis is controlled by a circuitry involving sequentially miRNA 17-5p–20a–106a, AML1 and M-CSFR, whereby miRNA 17-5p–20a–106a function as a master gene complex interlinked with AML1 in a mutual negative feedback loop.
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Acknowledgements
Supported by Italy-USA Oncology Program, Istituto Superiore di Sanità, Italy and NIH Grant 1R01HL63168 (CP). We thank A. Carfí, G. Marziali and M. E. Fiori for helpful discussions and for critically reading the manuscript. We are also grateful to A. M. Cerio and S. Giovinazzi for expert technical assistance, M. Biffoni and G. Mariani for FACS analysis, M. Blasi, V. Michetti and M. Fontana for editorial assistance and A. Zito for artwork.
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L.F. planned the research strategy, designed and performed experiments and wrote the paper. E.P., P.G., S.R., U.T. and F.L. performed experiments. C.M.C. provided microarray analysis. E.B. provided cord-blood samples. F.G. designed and interpreted ChIP experiments. C.P. planned the research strategy and wrote the paper.
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Fontana, L., Pelosi, E., Greco, P. et al. MicroRNAs 17-5p–20a–106a control monocytopoiesis through AML1 targeting and M-CSF receptor upregulation. Nat Cell Biol 9, 775–787 (2007). https://doi.org/10.1038/ncb1613
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DOI: https://doi.org/10.1038/ncb1613
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