Role of the renin-angiotensin system in hepatic ischemia reperfusion injury in rats

Hepatology : Official Journal of the American Association for the Study of Liver Diseases
Luping GuoGavin E Arteel

Abstract

It has been shown that the renin-angiotensin system (RAS) plays key roles in the development of fibrosis in numerous organs, including the liver. Other studies have suggested that the RAS also may play roles in diseases of chronic inflammation. However, whether the RAS also can mediate acute inflammation in liver is unclear. The purpose of this study therefore was to determine the effect of the RAS inhibitors captopril and losartan on acute liver damage and inflammation caused by hepatic ischemia and subsequent reperfusion. Accordingly, male rats were subjected to 1 hour of hepatic ischemia (70%) followed by reperfusion; animals were killed 3, 8, or 24 hours after reperfusion. The effect of captopril or losartan (100 or 5 mg/kg intragastrically, respectively) was compared with that of vehicle (saline). The expression of angiotensinogen in liver increased fivefold 3 hours after reperfusion. Indices of liver damage and inflammation (e.g., alanine aminotransferase levels, pathological features, tumor necrosis factor-alpha levels, and intercellular adhesion molecule-1 expression) all were significantly elevated in vehicle-treated animals after hepatic ischemia and subsequent reperfusion. Ischemia and reperfusion also caused an incr...Continue Reading

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