沙立度胺对大鼠肝纤维化核因子-κB和肿瘤坏死因子-α表达的影响

目的： 观察沙立度胺抗大鼠肝纤维化的疗效和对NF-κB和TNF-α表达的影响。方法： 四氯化碳腹腔注射诱导大鼠肝纤维化模型，治疗组于造模同时用沙立度胺10 mg·kg^-1·d^-1和100 mg·kg^-1·d^-1灌胃8周。观察肝组织病理学改变，检测肝功能、血清肝纤维化指标及肝组织羟脯氨酸含量，免疫组化检测NF-κB p65、α-SMA 在肝内的表达和分布，Western blotting检测肝组织NF-κB p65、IκBα、TNF-α蛋白的表达，RT-PCR检测肝组织TNF-α mRNA表达。结果： 高剂量沙立度胺治疗组肝脏炎症及纤维化程度低于模型组；其ALT、AST水平,HA、LN及羟脯氨酸含量，肝组织细胞核NF-κB p65和肝组织α-SMA蛋白表达，以及肝组织TNF-α mRNA和蛋白表达均低于模型组(P<0.01）；而PA水平和细胞质中IκBα蛋白表达高于模型组(P<0.01)。结论： 沙立度胺可有效地抑制实验性大鼠肝纤维化的发展，通过抑制IκB解离和降解从而减弱NF-κB通路对TNF-α表达的诱导可能是它发挥疗效的机制之一。

Effects of thalidomide on the expression of NF-κB and TNF-α in experimental hepatic fibrotic rats

AIM: To study the effects of thalidomide on the expressions of nuclear factor κB (NF-κB) and tumor necrosis factor-α (TNF-α) in rat liver fibrosis.METHODS: The fibrosis of rat liver was induced by intraperitoneal injection of carbon tetrachloride thrice weekly.Meanwhile thalidomide (10 mg·kg^-1·d^-1 or 100 mg·kg^-1·d^-1) was given daily by the intragastric route for 8 weeks.Serum alanine aminotransferase (ALT),aspartate aminotransferase (AST),prealbumin (PA),hyaluronic acid (HA) and laminin (LN),and hydroxyproline (HYP) contents in the liver,NF-κB p65 and α-smooth muscle actin (α-SMA) protein in the liver,IκBα and TNF-α protein in cytoplasm and NF-κB p65 protein in nucleus and TNF-α mRNA levels in the liver were studied.RESULTS: Compared with the model group,the Knodell score,serum ALT,AST,HA,LN levels and HYP contents in liver,NF-κB p65 protein in nucleus and α-SMA protein in the liver,and TNF-α mRNA and protein in the liver of rats given high dose of thalidomide were decreased significantly (P<0.01).Meanwhile PA level and IκBα protein in cytoplasm were elevated significantly (P<0.01).CONCLUSION: Thalidomide exerts its effect on the down-regulation of NF-κB-induced TNF-α via inhibiting dissociation and degradation of IκB and prevents liver fibrosis in rats.