Self-limited versus delayed resolution of acute inflammation: temporal regulation of pro-resolving mediators and microRNA

Sci Rep. 2012:2:639. doi: 10.1038/srep00639. Epub 2012 Sep 6.

Abstract

Mechanisms underlying delays in resolution programs of inflammation are of interest for many diseases. Here, we addressed delayed resolution of inflammation and identified specific microRNA (miR)-metabolipidomic signatures. Delayed resolution initiated by high-dose challenges decreased miR-219-5p expression along with increased leukotriene B(4) (5-fold) and decreased (~3-fold) specialized pro-resolving mediators, e.g. protectin D1. Resolvin (Rv)E1 and RvD1 (1 nM) reduced miR-219-5p in human macrophages, not shared by RvD2 or PD1. Since mature miR-219-5p is produced from pre-miRs miR-219-1 and miR-219-2, we co-expressed in human macrophages a 5-lipoxygenase (LOX) 3'UTR-luciferase reporter vector together with either miR-219-1 or miR-219-2. Only miR-219-2 reduced luciferase activity. Apoptotic neutrophils administered into inflamed exudates in vivo increased miR-219-2-3p expression and PD1/NPD1 levels as well as decreased leukotriene B(4). These results demonstrate that delayed resolution undermines endogenous resolution programs, altering miR-219-2 expression, increasing pro-inflammatory mediators and compromising SPM production that contribute to failed catabasis and homeostasis.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • 3' Untranslated Regions
  • Acute Disease
  • Animals
  • Apoptosis
  • Arachidonate 5-Lipoxygenase / genetics
  • Arachidonate 5-Lipoxygenase / metabolism
  • Cells, Cultured
  • Dinoprostone / metabolism
  • Exudates and Transudates / metabolism
  • Gene Expression
  • Humans
  • Inflammation / genetics
  • Inflammation / metabolism*
  • Inflammation Mediators / metabolism*
  • Leukotriene B4 / metabolism
  • Lipid Metabolism
  • Macrophages / enzymology
  • Macrophages / immunology
  • Macrophages / metabolism
  • Male
  • Mice
  • MicroRNAs / genetics*
  • MicroRNAs / metabolism
  • Neutrophils / metabolism
  • Neutrophils / physiology
  • Neutrophils / transplantation
  • Peritonitis / chemically induced
  • Peritonitis / pathology
  • Prostaglandin D2 / metabolism
  • RNA Interference*
  • Zymosan

Substances

  • 3' Untranslated Regions
  • Inflammation Mediators
  • MIRN219 microRNA, human
  • MicroRNAs
  • Leukotriene B4
  • Zymosan
  • Arachidonate 5-Lipoxygenase
  • Dinoprostone
  • Prostaglandin D2