中文摘要：

AIM:To investigate the effects of diammonium glycyrrhizinate(Gly)on portal hypertension(PHT)in isolated portal perfused rat liver(IPPRL)with carbon tetrachloride(CCl4)-induced chronic hepatitis.METHODS:PHT model was replicated with CCl4 in rats for 84 d.Model was identified by measuring the ascetic amounts,hepatic function,portal pressure in vivo,splenic index,and pathological alterations.Inducible nitric oxide synthase(iNOS)in liver was assessed by immunohistochemistry.IPPRLs were performed at d0,d28,d56,and d84.After phenylephrine-induced constriction,Gly was geometrically used to reduce PHT.Gly action was expressed as median effective concentration(EC50)and area under the curve(AUC).Underlying mechanism was exploited by linear correlation between AUC values of Gly and existed iNOS in portal triads.RESULTS:PHT model was confirmed with ascites,splenomegaly,serum biomarkers of hepatic injury,and elevated portal pressure.Pathological findings had shown normal hepatic structure at d0,degenerations at d28,fibrosis at d56,cirrhosis at d84in PHT rats.Pseudo lobule ratios decreased and collagen ratios increased progressively along with PHT development.Gly does dose-dependently reduce PHT in IPPRLs with CCl4-induced chronic hepatitis.Gly potencies were increased gradually along with PHT development,characterized with its EC50at 2.80×10-10,3.03×10-11,3.77×10-11and 4.65×10-11mol/L at d0,d28,d56and d84,respectively.Existed iNOS was located at hepatocyte at d0,stellate cells at d28,stellate cells and macrophages at d56,and macrophages in portal triads at d84.Macrophages infiltrated more into portal triads and expressed more iNOS along with PHT development.AUC values of Gly were positively correlated with existed iNOS levels in portal triads.CONCLUSION:Gly reduces indirectly PHT in IPPRL with CCl4-induced chronic hepatitis.The underlying mechanisms may relate to rescue NO bioavailability from macrophage-derived peroxynitrite in portal triads.

英文摘要：

AIM: To investigate the effects of diammonium glycyrrhizinate (Gly) on portal hypertension (PHT) in isolated portal perfused rat liver (IPPRL) with carbon tetrachloride (CCl4)-induced chronic hepatitis. METHODS: PHT model was replicated with CCl4 in rats for 84 d. Model was identified by measuring the ascetic amounts, hepatic function, portal pressure in vivo, splenic index, and pathological alterations. Inducible nitric oxide synthase (iNOS) in liver was assessed by immunohistochemistry. IPPRLs were performed at d0, d28, d56, and d84. After phenylephrine-induced constriction, Gly was geometrically used to reduce PHT. Gly action was expressed as median effective concentration (EC50) and area under the curve (AUC). Underlying mechanism was exploited by linear correlation between AUC values of Gly and existed iNOS in portal triads. RESULTS: PHT model was confirmed with ascites, splenomegaly, serum biomarkers of hepatic injury, and elevated portal pressure. Pathological findings had shown normal hepatic structure at d0, degenerations at d28, fibrosis at d56, cirrhosis at d84 in PHT rats. Pseudo lobule ratios decreased and collagen ratios increased progressively along with PHT development. Gly does dose-dependently reduce PHT in IPPRLs with CCl4-induced chronic hepatitis. Gly potencies were increased gradually along with PHT development, characterized with its EC50 at 2.80 × 10-10, 3.03 × 10-11, 3.77 × 10-11 and 4.65×10-11 mol/L at d0, d28, d56 and d84, respectively. Existed iNOS was located at hepatocyte at d0, stellate cells at d28, stellate cells and macrophages at d56, and macrophages in portal triads at d84. Macrophages infiltrated more into portal triads and expressed more iNOS along with PHT development. AUC values of Gly were positively correlated with existed iNOS levels in portal triads. CONCLUSION: Gly reduces indirectly PHT in IPPRL with CCl4-induced chronic hepatitis. The underlying mechanisms may relate to rescue NO bioavailability from macrophage-derived peroxynitrite in portal triads.