BACKGROUND: In hepatic ischemia-reperfusion (I/R) injury, oxidative stress both directly injures the liver and promotes an inflammatory reaction by up-regulating various inflammatory mediators. We investigated whether edaravone, a new hydroxy radical scavenger, could reduce hepatic I/R injury including expression of inflammatory mediators such as cytokines and adhesion molecules. MATERIALS AND METHODS: Male Sprague-Dawley rats were subjected to 30 min of partial hepatic pedicle clamping (70%) followed by reperfusion. Just after initiation of reperfusion and again 1 h later, edaravone was administered intraportally. After reperfusion hepatic lipid peroxidation was measured by thiobarbituric acid assay, and hepatic injury was quantified by measuring hepatic enzymes in plasma. We serially quantified hepatic expression of mRNAs for tumor necrosis factor (TNF)-alpha and E-selectin, and histologically examined E-selectin expression and neutrophil accumulation. RESULTS: In the edaravone group, hepatic lipid peroxidation and hepatic enzyme leakage were significantly less than in the saline group. Hepatic expression of TNF-alpha and E-selectin mRNAs was significantly lower in the edaravone than the saline group, at 2 h after initiation of reperfusion. Histologically, E-selectin immunoreactivity and neutrophil accumulation were less evident in hepatic sections from the edaravone group. CONCLUSIONS: Edaravone reduced hepatic I/R injury by minimizing oxidative stress, and inhibited subsequent injurious inflammation by reducing expression of inflammatory cytokines and adhesion molecules.
BACKGROUND: In hepatic ischemia-reperfusion (I/R) injury, oxidative stress both directly injures the liver and promotes an inflammatory reaction by up-regulating various inflammatory mediators. We investigated whether edaravone, a new hydroxy radical scavenger, could reduce hepatic I/R injury including expression of inflammatory mediators such as cytokines and adhesion molecules. MATERIALS AND METHODS: Male Sprague-Dawley rats were subjected to 30 min of partial hepatic pedicle clamping (70%) followed by reperfusion. Just after initiation of reperfusion and again 1 h later, edaravone was administered intraportally. After reperfusion hepatic lipid peroxidation was measured by thiobarbituric acid assay, and hepatic injury was quantified by measuring hepatic enzymes in plasma. We serially quantified hepatic expression of mRNAs for tumor necrosis factor (TNF)-alpha and E-selectin, and histologically examined E-selectin expression and neutrophil accumulation. RESULTS: In the edaravone group, hepatic lipid peroxidation and hepatic enzyme leakage were significantly less than in the saline group. Hepatic expression of TNF-alpha and E-selectin mRNAs was significantly lower in the edaravone than the saline group, at 2 h after initiation of reperfusion. Histologically, E-selectin immunoreactivity and neutrophil accumulation were less evident in hepatic sections from the edaravone group. CONCLUSIONS:Edaravone reduced hepatic I/R injury by minimizing oxidative stress, and inhibited subsequent injurious inflammation by reducing expression of inflammatory cytokines and adhesion molecules.