Oxidized phospholipids reduce vascular leak and inflammation in rat model of acute lung injury

American Journal of Respiratory and Critical Care Medicine
Stephanie NonasKonstantin G Birukov

Abstract

Acute inflammation and vascular leak are cardinal features of acute lung injury and the acute respiratory distress syndrome. Nonspecific tissue inflammation and injury in response to infectious and noninfectious insults lead to oxidative stress and the generation of lipid oxidation products, which may inhibit the acute inflammatory response to bacterial components. To test the hypothesis that oxidized 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphorylcholine (OxPAPC) may attenuate the acute lung inflammatory response to lipopolysaccharide (LPS) and enhance lung vascular barrier recovery, we used in vivo and in vitro models of LPS-induced lung injury. Rats received intratracheal aerosolized LPS (5 mg/kg) or sterile water with concurrent intravenous injection of OxPAPC (0.5-6.0 mg/kg) or saline alone. Nonoxidized PAPC was used as a control. At 18 h, bronchoalveolar lavage was performed and the lungs were removed for histologic analysis. Measurements of endothelial transmonolayer electrical resistance and immunofluorescent analysis of monolayer integrity were used in an in vitro model of LPS-induced lung vascular barrier dysfunction. In vivo, aerosolized intratracheal LPS induced lung injury with profound increases in bronchoalveo...Continue Reading

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