绿茶提取物对四氯化碳所致大鼠肝硬化的保护作用

目的 利用四氯化碳大鼠肝硬化模型,研究绿茶提取物对慢性肝保护的保护作用。方法 将动物分为3组：正常对照组,绿茶提取物处理组,肝硬化组。绿茶提取物处理组及肝硬化组分别按0．3ml／100g皮下注射40％CCl4,每周2次。于注射CCl4后的第2周,第9周分两批处死大鼠。观察肝羟脯氨酸含量、肝脂质过氧化产物丙二醛含量（MDA）、肝组织病理变化及肝组织中转化生长因子β1（TGF－β1）mRNA表达情况。结果 绿茶提取物处理组与肝硬化组相比,第2周及第9周MDA含量、TGF－β1mRNA表达明显降低;第9周羟脯氨酸含量明显降低;组织病理观察显示绿茶提取物处理组肝纤维化程度比肝硬化组轻。结论 补充绿茶提取物能减轻CCl4所致的肝硬化,可能是由于绿茶提取物的抗氧化作用导致肝组织TGF－β1mRNA表达的降低,从而抑制了TGF－β1介导的纤维增生、沉积过程。

Green tea extracts protected against carbon tetrachloride-induced chronic liver damage and cirrhosis

OBJECTIVE: Using the carbon tetrachloride liver cirrhosis rat model, the protective effect of the green tea extractive (GTE) on the liver cirrhosis was studied. METHODS: Male SD rats were randomly divided into three groups: normal group, GTE group and cirrhosis group. The GTE group and the cirrhosis group were injected subcutanuously 2 times/wk over 9 weeks with 40% CCl(4). In the second and the ninth week, the rats were sacrificed to measure MDA and hydroxyproline concentrations and TGF-beta(1) mRNA expression in liver tissue, as well as to conduct histological examination on various organs. RESULTS: Compared with the cirrhosis group, the MDA and the hydroxyproline concentrations in the GTE group were significantly reduced (P < 0.05). The liver necrosis and cirrhosis were extenuated in the GTE group by means of histologic examination. The expression of the TGF-beta(1) mRNA was reduced significantly in the GTE group. CONCLUSION: Dietary supplementation of GTE can protect against CCl(4)-induced liver damage and cirrhosis in rats.