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Am. J. Respir. Crit. Care Med., Vol 154, No. 5, 11 1996, 1364-1369.

Lung injury after hepatoenteric ischemia-reperfusion: role of xanthine oxidase

VG Nielsen, S Tan, A Weinbroum, AT McCammon, PN Samuelson, S Gelman and DA Parks
Department of Anesthesiology, University of Alabama at Birmingham, USA.

Oxidant stress plays a major role in the pathophysiologic processes associated with ischemia-reperfusion injury. Xanthine oxidase (XO) is often implicated as a significant source of oxidants and increases in the circulation after hepatoenteric ischemia-reperfusion. We hypothesized that pulmonary injury is associated with hepatic ischemia- reperfusion resulting from descending thoracic aorta occlusion- reperfusion (AoOR). We also proposed that this remote pulmonary injury is attenuated through inactivation of circulating and tissue XO by tungstate, implicating an XO-dependent mechanism. Aortic occlusion was established in rabbits (standard or tungstate diet) for 40 min by 2 h reperfusion. Sham operated rabbits (standard or tungstate diet) served as controls. Hepatic reperfusion injury, as manifested by release of the hepatocellular enzyme alanine aminotransferase (ALT), was markedly increased after AoOR. Suprarenal-infrahepatic occlusion failed to increase ALT release. Tungstate pretreatment significantly (p < 0.05) reduced XO activity and ameliorated liver and intestinal injury (p < 0.05). Lung injury, manifested by increased bronchoalveolar lavage (BAL) protein concentration, BAL lactate dehydrogenase (LDH) activity and increased lung edema was significantly associated with liver injury (p < 0.05) and circulating XO activity (p < 0.001). XO inactivation significantly decreased BAL protein concentration, BAL LDH activity, and lung edema (p < 0.05). We conclude that remote pulmonary injury is significantly influenced by the extent of liver injury and circulating XO activity.


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