Article ID Journal Published Year Pages File Type
1908589 Free Radical Biology and Medicine 2012 16 Pages PDF
Abstract

Mitochondrial reactive oxygen species generation has been implicated in the pathophysiology of ischemia–reperfusion (I/R) injury; however, its exact role and its spatial–temporal relationship with inflammation are elusive. Herein we explore the spatial–temporal relationship of oxidative/nitrative stress and inflammatory response during the course of hepatic I/R and the possible therapeutic potential of mitochondrial-targeted antioxidants, using a mouse model of segmental hepatic ischemia–reperfusion injury. Hepatic I/R was characterized by early (at 2 h of reperfusion) mitochondrial injury, decreased complex I activity, increased oxidant generation in the liver or liver mitochondria, and profound hepatocellular injury/dysfunction with acute proinflammatory response (TNF-α, MIP-1α/CCL3, MIP-2/CXCL2) without inflammatory cell infiltration, followed by marked neutrophil infiltration and a more pronounced secondary wave of oxidative/nitrative stress in the liver (starting from 6 h of reperfusion and peaking at 24 h). Mitochondrially targeted antioxidants, MitoQ or Mito-CP, dose-dependently attenuated I/R-induced liver dysfunction, the early and delayed oxidative and nitrative stress response (HNE/carbonyl adducts, malondialdehyde, 8-OHdG, and 3-nitrotyrosine formation), and mitochondrial and histopathological injury/dysfunction, as well as delayed inflammatory cell infiltration and cell death. Mitochondrially generated oxidants play a central role in triggering the deleterious cascade of events associated with hepatic I/R, which may be targeted by novel antioxidants for therapeutic advantage.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (426 K)Download as PowerPoint slideHighlights► Ischemia–reperfusion (I/R) injury is a pivotal mechanism of organ damage/dysfunction. ► The exact role and timing of mitochondrial oxidant generation in liver I/R are elusive. ► Mitochondrial oxidant generation triggers I/R-induced liver inflammation and injury. ► Mitochondrial antioxidants (MTAs) prevent I/R-induced oxidative/nitrative injury. ► MTAs prevent I/R-induced acute/delayed inflammatory response and cell death.

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