Objective To observe the prevention and treatment of the total flavonoids from Litchi chinensis Sonn( TFL) on hepatic fibrosis induced by dimethylnitrosamine(DMN)in rats, and to explore its mechanism. Methods Ninety SD rats were randomly divided into six groups, normal control group, model control group, colchicine group, high-, medium- and low-dose TFL group(n=15).Expect for normal control group, the other groups were given intraperitoneal injection of 2 mL.kg-1 of 5% dimethylnitrosamine for 4 weeks as the model group. The rats in the normal control group and model control group were given 5 mL.kg-1of 0.9% sodium chloride solution, colchicine group was treated with 0.1 mg.kg-1 colchicine.High-, medium-and low-dose TFL groups were given 200, 100 and 50 mg.kg-1 of TFL.The rats were sacrificed and the livers were harvested and stained with HE and Masson staining to observe pathological changes and liver fibrosis in the same part 6 weeks after all the medicine was given to the rats each day. Immunohistochemistry and Western blotting were used to detect the expression of the transforming growth factor β-Ⅰ/type Ⅱ receptor ( TβRⅠ/Ⅱ) , collagen Ⅰ( Col Ⅰ) and Ⅲ collagen ( Col Ⅲ) . Results Compared with the normal control group, the semiquantitative score of liver fiber and the protein expression of TβRⅠ, TβRⅡ, ColⅠ and Col Ⅲ in the model control group were significantly increased(P<0.01).Compared with the model control group, the protein expression levels of TβR, TβRⅡ, ColⅠand ColⅢwere significantly decreased( P<0.01) in the high-,medium-and low-dose TFL group.The semiquantitative score of liver fiber was significantly decreased( P<0.01) with a dose-effect relationship. Conclusion TFL can inhibit formation of DMN-induced liver fibrosis in rats, which may be related with reduction of expression of TβRⅠ/Ⅱ of hepatic fibrosis promoting factor TGF-β1 , inhibition of the activation and increase of hepatic stellate cells, reduction of the collagen content.%目的：观察荔枝核总黄酮( TFL)对二甲基亚硝胺( DMN)诱导的大鼠肝纤维化的防治效果,并探讨其可能机制。方法90只SD大鼠随机分为6组,即正常对照组、模型对照组、秋水仙碱组、TFL大剂量组、TFL中剂量组和TFL小剂量组,每组15只。除正常对照组外,腹腔注射0.5％DMN 2 mL.kg－14周,制作大鼠肝纤维化模型。造模当日开始给药,正常对照组及模型对照组灌胃0.9％氯化钠溶液5 mL . kg－1, TFL 大、中、小剂量组分别灌胃 TFL 200,100,50 mg.kg－1,秋水仙碱组灌胃秋水仙碱0.1 mg.kg－1,各组每日给药1次,共6周。至实验第6周末处死大鼠,取肝脏同一部位行苏木精-伊红( HE)、Masson 染色观察大鼠病理改变及肝纤维化程度；采用免疫组化法和蛋白质印迹法( Western blotting)检测转化生长因子β-Ⅰ/Ⅱ型受体( TβRⅠ/Ⅱ)和Ⅰ型胶原( ColⅠ)、Ⅲ型胶原( ColⅢ)表达。结果与正常对照组比较,模型对照组大鼠肝纤维半定量评分和TβRⅠ、TβRⅡ、ColⅠ和ColⅢ蛋白表达均显著升高,差异有统计学意义( P<0.01)；与模型对照组比较,TFL 大、中、小剂量组TβRⅠ、TβRⅡ、ColⅠ和ColⅢ蛋白表达均明显降低,差异有统计学意义(P<0.01)；肝纤维半定量评分显著降低,差异有统计学意义(P<0.01),且具有一定量效关系。结论 TFL可抑制DMN诱导的大鼠肝纤维化形成,其机制可能与下调促肝纤维化因子TGF-β1受体TβRⅠ/Ⅱ的表达,抑制肝星状细胞的增殖与活化,降低胶原含量,从而发挥抗肝纤维化的作用有关。
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