水飞蓟素阻断二甲基亚硝胺诱导大鼠肝纤维化的实验研究

目的评价水飞蓟素对实验性二甲基亚硝胺(DMN)诱导的 Wistar 大鼠肝纤维化模型的效果。方法 Wistar 雄性大鼠61只随机分为正常对照组15只;DMN 模型组23只,DMN 10mg/kg,腹腔注射,1周2次,连续8周;水飞蓟素组23只,同样方法造模,造模之日起,即给予水飞蓟素(利加隆)50 mg·kg~(-1)·d~(-1)灌胃,1次/d,连续8周。实验8周,断颈处死大鼠,取血,检测丙氨酸氨基转移酶(ALT)、天冬氨酸氨基转移酶(AST)、白蛋白、总胆红素,取肝组织,测定肝组织羟脯氨酸含量;病理组织 Masson 染色,肝纤维化分级、积分。结果水飞蓟素组血清 ALT(128 U/L±25 U/L vs59 U/L±19 U/L,P<0.01);AST(246 U/L±61 U/L vs 159 U/L±39 U/L,P=0.001);总胆红素(平均秩次:37 vs 23,P=0.003)均显著低于模型组;与模型组比较,水飞蓟素组肝组织羟脯氨酸含量低42.6%,肝组织纤维化分级和积分显著改善(12.8±4.4 vs 6.2±2.4,p=0.001)。结论水飞蓟素可抑制肝脏炎症,保护肝脏功能,可部分阻断和逆转 DMN 诱导肝纤维化。

Inhibitory effects of silymarin on hepatic fibrosis induced by dimethylnitrosamine: experiment with rats

OBJECTIVE: To investigate the antifibrotic effects of silymarin on hepatic fibrosis. METHODS: Sixty-one male Wistar rats were randomly divided into three groups: control group (15 rats); DMN model group (23 rats), injected intraperitoneally with dimethylnitrosamine (DMN) 10 mg/kg twice per week for 8 weeks to induce hepatic fibrosis; and silymarin group (23 rats), injected intraperitoneally with DMN and given silymarin 50 mg/kg by gastric gavage daily for 8 weeks. Eight weeks late all rats were sacrificed. Blood samples were collected to measure the alanine transaminase (ALT), aspirate aminotransferase (AST), albumin, and total bilirubin (TBIL). The hydroxyproline (Hyp) content in the liver tissue was measured. The histopathological changes as well as the fibrosis stages and score were examined by microscopy. RESULTS: The levels of ALT, AST, and TBIL of the silymarin groups were 59 U/L +/- 19 U/L, 159 U/L +/- 39 U/L, and mean rank 24 respectively, all significantly lower than those of the DMN model group (128 U/L +/- 25 U/L, 246 U/L +/- 61 U/L, and mean rank 37 respectively, P < 0.01, P = 0.001, and P = 0.003). Compared with DMN rats, the level of Hyp of the silymarin was lower by 42.6%, the hepatic score of the silymarin was 6.2 +/- 2.4, significantly than that of the DMN model group (12.8 +/- 4.4, P = 0.001), and more cases in the silymarin group were at the lower stages. CONCLUSION: Silymarin markedly inhibits and reverse the progression of hepatic fibrosis induced by dimethylnitrosamine.