Prevention of Reoxygenation Injury by Sodium Salicylate in Isolated-Perfused Rat Liver

Sodium salicylate can be used as a chemical trap for hydroxyl radicals, the most damaging reactive oxygen species. Because reactive oxygen species are involved in the pathogenesis of hepatic hypoxia/reoxygenation injury, the goal of this study was to determine if trapping hydroxyl radicals with salicylate would prevent or at least ameliorate such injury. Isolated rat livers, continuously perfused with Krebs-Henseleit bicarbonate buffer in the presence or absence of salicylate (2 mM), were exposed, after 30 min of recovery, to 60 min of hypoxia, followed by 30 min of reoxygenation. During reoxygenation, control livers experienced a sharp increase in the rate of lactic dehydrogenase release, taken as index of cell injury, protein carbonyl content, and malondialdehyde, taken as index of protein oxidation and lipid peroxidation, respectively. The presence of salicylate in the solution perfusion significantly reduced the rate of lactic dehydrogenase release, protein carbonyl content, and malondialdehyde production during reoxygenation. Hepatic histology documented a significantly reduced cell injury in salicylate-perfused livers compared to control livers. These data suggest that the hydroxyl radical chemical trap sodium salicylate, acting as an antioxidant, may represents an effective agent to reduce liver injury due to hypoxia/reoxygenation in a model of isolated-perfused rat liver.