Cited by 1,062

Regulation of progenitor cell proliferation and granulocyte function by microRNA-223

Johnnidis, Jonathan B., Harris, Marian H., Wheeler, Robert T., Stehling-Sun, Sandra, Lam, Michael H., Kirak, Oktay, Brummelkamp, Thijn R., Fleming, Mark D. +1 more·2008·Nature

Abstract

MicroRNAs are abundant in animal genomes and have been predicted to have important roles in a broad range of gene expression programmes. Despite this prominence, there is a dearth of functional knowledge regarding individual mammalian microRNAs. Using a loss-of-function allele in mice, we report here that the myeloid-specific microRNA-223 (miR-223) negatively regulates progenitor proliferation and granulocyte differentiation and activation. miR-223 (also called Mirn223) mutant mice have an expanded granulocytic compartment resulting from a cell-autonomous increase in the number of granulocyte progenitors. We show that Mef2c, a transcription factor that promotes myeloid progenitor proliferation, is a target of miR-223, and that genetic ablation of Mef2c suppresses progenitor expansion and corrects the neutrophilic phenotype in miR-223 null mice. In addition, granulocytes lacking miR-223 are hypermature, hypersensitive to activating stimuli and display increased fungicidal activity. As a consequence of this neutrophil hyperactivity, miR-223 mutant mice spontaneously develop inflammatory lung pathology and exhibit exaggerated tissue destruction after endotoxin challenge. Our data support a model in which miR-223 acts as a fine-tuner of granulocyte production and the inflammatory response.

Integrity signals

Registry

Crossref · 10.1038/nature06607

Cites

2 of 2 references verified0 citation errors · 0 not checkable

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Authors
Johnnidis, J. B., Harris, M. H., Wheeler, R. T., Stehling-Sun, S., Lam, M. H., Kirak, O., Brummelkamp, T. R., Fleming, M. D., & Camargo, F. D.
Venue
Nature
Published
2008-02
Volume
451
Issue
7182
Pages
1125-1129
ISSN
  • 0028-0836
  • 1476-4687
Cited by
1,062
References
2
Language
en

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