J.Jpn. Surg. Soc.. 91(1): 95-100, 1990

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Original article

THE ROLE OF α-TOCOPHEROL AND ALLOPURINOL IN LIPID PEROXIDATION AND MITOCHONDRIAL RESPIRATION IN THE ISCHEMIC RAT LIVER

In the present study, the effects of α-tocopherol and allopurinol in liver ischemia and reperfusion injury on lipid peroxidation and mitochondrial respiratory function were investigated in rats. Ischemia was induced in the left and median liver lobes clamping the vessels for 90 minutes. After declamping reperfusion was continued for 60 minutes. Liver tissue was taken before and 90 minutes after ischemia and 60 minutes after reperfusion to measure lipid peroxides and mitochondrial respiratory function. In one group of rats α-tocopherol (10mg/kg) was given intraperitoneally for three consecutive days preoperatively and in the other group allopurinol (50mg/kg) was given intravenously 10 minutes before ischemia.
α-Tocopherol caused inhibition of increase in lipid peroxides at reperfusion and improvement in lowering of mitochondrial respiratory function. This improvement was less than previously reported, probably due to not only reperfusion injury but also ischemic injury. Allopurinol, on the other hand, caused neither such inhibition nor such improvement, suggesting the other source of oxygen-derived free radicals than xanthine oxidase system.

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