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It is known that estrogen protects tissues against organ ischemia. This study examined the protective effect of estrogen against hepatic ischemia and reperfusion. Rats were subjected to hepatic ischemia for 60 min and were sacrificed at 3, 6, 12, 24 hr after reperfusion. Estrogen (4 ㎎/㎏) or oil was administered at 1 hr before hepatic ischemia. Alanine aminotransferase and asparatate aminotransferase levels were immediately increased after reperfusion, peaked at 6 hr and then declined gradually. Alanine aminotransferase and asparatate aminotransferase levels were significantly suppressed by estrogen treatment. After 24 hr of reperfusion, ischemic lobe showed inflammatory lesions with severe congestion in oil-treated group. However, in estrogen-treated group, only mild congestion was observed. In histological observation, severity of hepatic injury was getting worse in process of time. In oil-treated animals, most ischemic liver lobes showed hepatocyte necrosis and massive neutrophils infiltration. However, estrogen attenuated the damage of hepatic tissue caused by hepatic ischemic and reperfusion injury. Thus, our results suggest that estrogen play a potent protective role against hepatic injury.

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