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  • 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
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
Issue number8
StatePublished - 2011

ID: 267741