Macrophage development from HSCs requires PU.1-coordinated microRNA expression

S. Ghani, P. Riemke, J. Schonheit, D. Lenze, J. Stumm, M. Hoogenkamp, A.K. Lagendijk, S.K. Heinz, C. Bonifer, J. Bakkers, S. Abdelilah-Seyfried, M. Hummel, F. Rosenbauer

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Abstract

The differentiation of HSCs into myeloid lineages requires the transcription factor PU.1. Whereas PU.1-dependent induction of myeloid-specific target genes has been intensively studied, negative regulation of stem cell or alternate lineage programs remains incompletely characterized. To test for such negative regulatory events, we searched for PU.1-controlled microRNAs (miRs) by expression profiling using a PU.1-inducible myeloid progenitor cell line model. We provide evidence that PU.1 directly controls expression of at least 4 of these miRs (miR-146a, miR-342, miR-338, and miR-155) through temporally dynamic occupation of binding sites within regulatory chromatin regions adjacent to their genomic coding loci. Ectopic expression of the most robustly induced PU.1 target miR, miR-146a, directed the selective differentiation of HSCs into functional peritoneal macrophages in mouse transplantation assays. In agreement with this observation, disruption of Dicer expression or specific antagonization of miR-146a function inhibited the formation of macrophages during early zebrafish (Danio rerio) development. In the present study, we describe a PU.1-orchestrated miR program that mediates key functions of PU.1 during myeloid differentiation. [KEYWORDS: Animals, Cell Differentiation/genetics, Cell Line, Cell Lineage/genetics, Hematopoietic Stem Cells/ cytology/ metabolism, Macrophages, Peritoneal/ cytology/ metabolism, Mice, Mice, Inbred C57BL, MicroRNAs/ genetics, Myelopoiesis/genetics, Proto-Oncogene Proteins/antagonists & inhibitors/ genetics, RNA, Small Interfering/genetics, Trans-Activators/antagonists & inhibitors/ genetics, Zebrafish/embryology/genetics]
Original languageEnglish
Pages (from-to)2275-2284
JournalBlood
Volume118
Issue number8
DOIs
Publication statusPublished - 2011

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