A transient reversal of miRNA‐mediated repression controls macrophage activation LPS‐induced phosphorylation at Tyr‐529 dissociates miRNA from Ago2 and.

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A transient reversal of miRNA‐mediated repression controls macrophage activation LPS‐induced phosphorylation at Tyr‐529 dissociates miRNA from Ago2 and causes downregulation of miRNA activity in RAW 264.7 cells. (A) Tyr phosphorylated proteins were IP(ed) with anti‐phosphotyrosine antibody (4G10) from naïve and LPS‐stimulated RAW 264.7 cell extracts and immunoblotted for Ago2 (upper panel). Reciprocally, endogenous Ago2 was IPed and immunoblotted for Tyrosine phosphorylated Ago2 (pYAgo2) using 4G10 antibody (lower panel). (B) miRNA binding to Ago2 and Y529F mutant. FH‐Ago2 or FH‐Ago2Y529F were IP (ed) from LPS‐treated or naïve RAW 264.7 cells expressing miR‐122 and FH‐Ago2 or FH‐Ago2Y529F‐associated miRNA levels were quantified. (C–E) Ago2 phosphorylation and miRNA activity in RAW 264.7 cells. Purified miRISC isolated from naïve or LPS‐activated RAW 264.7 cells coexpressing miR‐122 and either FH‐Ago2 or FH‐Ago2Y529F was used for in vitro RISC cleavage assay. Cleaved product is marked by an * (C; upper panel). Ago2 level in isolated RISC was quantified by western blot (C; bottom panel). Phosphotyrosine status of isolated FH‐Ago2 or FH‐Ago2Y529F, before and after LPS activation, were detected using 4G10 antibody (D). Repression level of RL‐3xbulge‐miR‐122 reporter in LPS‐treated RAW 264.7 cells expressing miR‐122 and coexpressing either FH‐Ago2 or its mutants. Repression levels in LPS‐untreated cells were used for normalization (*P<0.0450) (E). For panels A and D, western blots were quantified and normalized against the signal intensities of the corresponding heavy chain of anti‐HA antibody used for immunoprecipitation. For quantification purpose, mean values±s.d. were determined from three independent experiments. HC, heavy chain; IP, immunoprecipitation; LPS, lipopolysaccharide; miRNA, microRNA; RISC, RNA‐induced silencing complex; RL, Renilla luciferase. 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)