A transient reversal of miRNA‐mediated repression controls macrophage activation Loss of miRNA from Ago2 deactivates miRNPs in LPS‐treated mammalian macrophages.

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A transient reversal of miRNA‐mediated repression controls macrophage activation Loss of miRNA from Ago2 deactivates miRNPs in LPS‐treated mammalian macrophages. (A) Ago2 binding to target mRNA in RAW 264.7 cells expressing a RL let‐7a reporter and FLAG‐HA‐Ago2. Cells were lysed before and after 4 h of LPS treatment and from Ago2 IPed materials RNA was isolated and Ago2‐associated RL‐3xbulge‐let‐7a mRNA was quantified (left panel) (***P<0.0002). In similar but separate IP experiments, quantifications of Ago2‐associated TNF‐α, and IL‐6 mRNAs were performed (right panel) (*P<0.0376). (B) A schematic representation of RL‐5BoxB reporter used for Ago2‐tethering experiments. In tethering assay, RL‐5BoxB mRNA was co‐expressed with either N‐HA‐Ago2 or HA‐Ago2 and repression level of RL‐5BoxB reporter was measured. Association of RL‐5BoxB mRNA with N‐HA‐Ago2 in untreated or 4‐h LPS‐treated RAW 264.7 cells was quantified. (C) Relative level of active miR‐122 RISC present in naïve and 4‐h LPS‐treated cells were quantified by in vitro RISC cleavage assays (cleaved product is marked by an *). For negative control, miRISC was prepared from naïve RAW 264.7 cells not expressing miR‐122. A 32P 22 nt marker oligonucleotide was loaded as size marker (lane M). (D,E) Change in miRNA binding to Ago2 in LPS‐activated macrophages. let‐7a level in Ago2 IPed materials isolated before and after 4‐h LPS treatment was quantified in RAW 264.7 or mouse primary macrophages isolated from peritoneal exudates (D) or in splenic macrophages of mice intraperitoneally injected with LPS or PBS (E). n=3 for LPS‐ or PBS‐injected mice. (F) Levels of different miRNAs were quantified from HA‐Ago2 immunoprecipitates obtained from naïve‐ or LPS‐activated RAW 264.7 cells. (G) Let‐7a miRNA association was measured from HA‐Ago1 or HA‐Ago3 immunoprecipitates before and after LPS treatment. For quantification purpose, mean values±s.d. were determined from three independent assays. LPS, lipopolysaccharide; miRISC, miRNA‐induced silencing complex; miRNA, microRNA; miRNP, microRNA protein complex; mRNA, messenger RNA; PBS, phosphate‐buffered saline; RISC, RNA‐induced silencing complex; RL, Renilla luciferase; TNF‐α, tumour necrosis factor alpha. IF THIS IMAGE HAS BEEN PROVIDED BY OR IS OWNED BY A THIRD PARTY, AS INDICATED IN THE CAPTION LINE, THEN FURTHER PERMISSION MAY BE NEEDED BEFORE ANY FURTHER USE. PLEASE CONTACT WILEY'S PERMISSIONS DEPARTMENT ON PERMISSIONS@WILEY.COM OR USE THE RIGHTSLINK SERVICE BY CLICKING ON THE 'REQUEST PERMISSIONS' LINK ACCOMPANYING THIS ARTICLE. WILEY OR AUTHOR OWNED IMAGES MAY BE USED FOR NON-COMMERCIAL PURPOSES, SUBJECT TO PROPER CITATION OF THE ARTICLE, AUTHOR, AND PUBLISHER. EMBO Rep, Volume: 14, Issue: 11, Pages: 1008-1016, First published: 13 September 2013, DOI: (10.1038/embor.2013.149)