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Serum concentration of thiobarbituric acid (TBA) reactants in the hepatic vein were measured before and after transient dearterialization of the liver in five human subjects bearing unresectable hepatocellular carcinoma (HCC). During 1 hour of the occlusion of the hepatic artery, change in TBA reactants level was slight. However, the mean value of TBA reactants in 1 hour after the reflow increased to 1.50 +/- 0.11 nmol/ml (mean +/- S.E.) and was significantly higher (p &lt; 0.05) than those before hepatic dearterialization (1.28 +/- 0.11 nmol/ml) and just before the release of occlusion (1.32 +/- 0.09 nmol/ml). Further, two endogeneous scavenger enzymes, superoxide dismutase (SOD) and catalase (CAT), and one of the major sources of oxygen free radicals, xanthine oxidase (XOD) were measured in human untreated HCC and the corresponding adjacent liver tissue. The results demonstrated an increase in SOD in 81.8% (9/11) of HCC, and a decrease in CAT in 72.7% (8/11) of HCC when compared with the corresponding adjacent liver tissue. The mean value of SOD in HCC was significantly higher (66.8 +/- 6.5 vs 52.8 +/- 3.8 U/mg protein; p &lt; 0.05), and that of CAT was significantly lower (22.6 +/- 2.4 vs 36.0 +/- 6.1 U/mg protein; p &lt; 0.05) than those in liver tissue. All of nine HCC samples had a significantly lower activity of XOD (6.4 +/- 1.9 vs 20.3 +/- 3.4 pmol/minute/mg protein; p &lt; 0.01) than the corresponding liver tissue. There was no obvious relation between the content of SOD and CAT in HCC, or in liver tissue.(ABSTRACT TRUNCATED AT 250 WORDS)

hpb surgery

Clinical and Enzymatic Investigation of Induction of Oxygen Free Radicals by Ischemia and Reperfusion in Human Hepatocellular Carcinoma and Adjacent Liver