苦参素对肝纤维化大鼠肝脏TGF-β1的调节作用

目的观察苦参素(OM)对肝纤维化大鼠的防治作用及对转化生长因子β1(TGF-β1)表达的影响。方法采用CCl4诱导大鼠肝纤维化模型。于实验的第12周末采血,检测ALT、AST、Ⅰ型胶原和TGF-β1。肝脏病理学检测HE染色后观察肝组织改变,Masson胶原纤维染色,每组样本随机观察8个视野的肝纤维化程度,RT-PCR检测TGF-β1mRNA表达。结果苦参素组能明显降低肝纤维化大鼠血清谷丙转氨酶(ALT)、谷草转氨酶(AST)、Ⅰ型胶原和TGF-β1水平,同时病理组织学显示苦参素能明显改善CCl4诱导的肝纤维化大鼠的肝组织结构和肝纤维化;TGF-β1基因表达量较模型组明显减少。结论苦参素可明显降低实验大鼠胶原沉积,对CCl4诱导的肝纤维化大鼠有良好的保护作用,对TGF-β1表达的影响可能是其作用机制之一。

Regulating effect of oxymatrine on TGF-β1 in CCl4-induced hepatic fibrosis rats

Aim To explore the anti-fibrotic effect of Oxymatrine(OM) on CCl4-induced liver fibrosis in rats and its modulation on the TGF-β1.Methods A hepatic fibrosis model was induced by CCl4.The levels of Alanine transaminase(ALT),aspartic transaminase(AST),type-Ⅰ collagen and TGF-β1 in plasma were detected by chemical Kit.The deposition of collagen was observed with H&E and Masson staining.Pathological changes were observed under light microscope in 8 randomly selected fields in each group.RT-PCR method was applied to detect the expression of TGF-β1 mRNA in hepatic tissue.Results The concentration of serum ALT,AST,type-Ⅰ collagen and TGF-β1 was significantly reduced in the middle and high dose treated groups compared with that of model group.A significant reduction of collagen deposition and rearrangement in OM-treated group was displayed in histopathological changes.The expression of TGF-β1 mRNA was considerably decreased in the treated animals.Conclusions Oxymatrine is effective in reducing the production and deposition of collagen in the liver tissue of experimental groups,and it has an obvious protective effect on model rats.It may be one of the therapeutic mechanisms to modulate the expression of TGF-β1 mRNA.