Journal
NATURE IMMUNOLOGY
Volume 11, Issue 2, Pages 141-U59Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ni.1828
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Funding
- Science Foundation Ireland
- Irish Research Council for Science, Engineering and Technology [RS/2005/190]
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The tumor suppressor PDCD4 is a proinflammatory protein that promotes activation of the transcription factor NF-kappa B and suppresses interleukin 10 (IL-10). Here we found that mice deficient in PDCD4 were protected from lipopolysaccharide (LPS)-induced death. The induction of NF-kappa B and IL-6 by LPS required PDCD4, whereas LPS enhanced IL-10 induction in cells lacking PDCD4. Treatment of human peripheral blood mononuclear cells with LPS resulted in lower PDCD4 expression, which was due to induction of the microRNA miR-21 via the adaptor MyD88 and NF-kappa B. Transfection of cells with a miR-21 precursor blocked NF-kappa B activity and promoted IL-10 production in response to LPS, whereas transfection with antisense oligonucleotides to miR-21 or targeted protection of the miR-21 site in Pdcd4 mRNA had the opposite effect. Thus, miR-21 regulates PDCD4 expression after LPS stimulation.
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