[Protective effects of an inhibitor of glycoprotein IIb/IIIa in the hepatic and pulmonary disturbances secondary to ischemia and reperfusion injury of rat's liver]. / Efeito protetor de antagonista das gliproteínas IIb/IIa nas alterações hepáticas e pulmonares secundárias à isquemia e reperfusão do fígado em ratos.

UNLABELLED: BACKGROUND Hepatic ischemia-reperfusion injury is responsible for a considerable morbidity and mortality. AIM: To evaluate the effect of a platelet glycoprotein IIb/IIIa receptor inhibitor (tirofiban) on hepatic and pulmonary disturbances associated with hepatic ischemia-reperfusion injury. METHODS: Twenty-three Wistar rats divided in three groups: rats sham-operated (n = 6), rats submitted to ischemia-reperfusion that received saline solution (n = 8), and rats submitted to ischemia-reperfusion treated with 0.7 mg/kg of tirofiban (n = 9). Serum aminotransferases (AST and ALT) were also determined, and the study of hepatic tissue histology was carried out. The evaluation of the pulmonary disturbances was done using the Evans blue test and the tissular determination of myeloperoxidase. Hepatic mitochondrial oxidation and phosphorylation were also measured. RESULTS: There was an increase in the state 3 respiration, ADP/O ratio and respiration control rate in the group treated with tirofiban. This group had also lower levels of aminotransferases and the histological findings were significantly less intense. Pulmonary evaluation demonstrated decrease of the Evans blue test in the tirofiban group and an increase of its tissular determination of myeloperoxidase. CONCLUSION: The inhibition of glycoprotein IIb/IIIa receptor with tirofiban protected the hepatic disturbances and prevented the increase of pulmonary vascular permeability secondary to the ischemia-reperfusion injury of the liver.