灯盏乙素对长期高脂高糖饮食诱导的肥胖大鼠慢性肝损伤中肝脏组织MMP2、MMP9及TIMP-1蛋白表达的影响

Effects of Scutellarin on MMP2,MMP9 and TIMP-1 Protein in Liver of Obese Rats with Chronic Liver Injury by High Glucose and Fat Diet

目的研究在高脂高糖饮食诱导建立的肥胖大鼠慢性肝损伤肝脏纤维化模型中,灯盏乙素(SCU)对其发病机制的影响,探讨SCU能否通过促进MMP2、MMP9,抑制TIMP-1的表达改善肝脏纤维化程度。方法采用高脂高糖饮食诱导慢性肝损伤肝脏纤维化模型,SCU和姜黄素(CUR)灌胃治疗8周后,HE染色观察肝组织病理变化;Masson染色观察胶原纤维在肝脏中的沉积;Western blot和免疫组织化学染色观察肝脏组织TIMP-1、MMP2、MMP9的表达。结果在肝脏组织中,模型组大鼠肝细胞形态不规则细胞水肿,并有大量脂肪空泡出现,汇管区有蓝色胶原纤维沉积,不同剂量的SCU和CUR干预后,脂肪空泡减少,肝细胞肿胀情况减少,纤维化程度得到改善。在大鼠肝细胞中,模型组MMP2、MMP9蛋白表达下调(P<0.01),不同剂量SCU和CUR干预后MMP2、MMP9蛋白表达上调(P<0.01);模型组TIMP-1蛋白表达上调(P<0.01),不同剂量SCU和CUR治疗后TIMP-1蛋白表达下调(P<0.01),没有很明显的剂量依赖性。结论SCU可能通过促进MMP2、MMP9,抑制TIMP-1蛋白的表达,减少ECM的积累改善肥胖引起的肝脏纤维化。

Objective To investigate the effect of scutellarin(SCU)on liver fibrosis in obese rats with chronic liver injury induced by high-fat and high-sugar diet,and to explore the possibility of SCU to ameliorate the degree of liver fibrosis by promoting the expression of MMP2 and MMP9 and inhibiting the expression of TIMP-1.Methods The model of chronic liver injury and liver fibrosis was induced by high-fat and high-sugar diet.After 8 weeks of intragastric administration of SCU and curcumin(CUR),HE staining was used to observe the pathology of liver tissue;Masson staining was used to detect the deposition of collagen fibers in liver tissue;and western blot and immunohistochemical staining were used to observe the expression of TIMP-1,MMP2 and MMP9 in liver tissue.Results In the model group,hepatocytes were swollen with irregular hepatocyte morphology,a large number of fat vacuoles,and blue collagen fibers were deposited in the confluent area.After different doses of SCU and CUR intervention,the fat vacuoles were reduced,the swelling of hepatocytes was decreased,and the degree of fibrosis was improved.In liver tissue cells,the protein expressions of MMP2 and MMP9 were down-regulated in the model group(P<0.01),and up-regulated after treatment with different doses of SCU and CUR(P<0.01).The expression of TIMP-1 protein was up-regulated in the model group(P<0.01),and down-regulated after treatment with different doses of SCU and CUR(P<0.01),and the dose dependence was not significant.Conclusion SCU may improve liver fibrosis caused by obesity by promoting MMP2 and MMP9,inhibiting the expression of TIMP-1 protein and reducing the accumulation of ECM.