瘦素对大鼠肝纤维化的信号转导调控及槲寄生碱的干预作用
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国家自然科学基金资助项目(81272757);北京市属高等学校创新团队建设与教师职业发展计划项目(IDHT20150502)。


The signal transduction pathway of rats with liver fibrosis regulated by leptin and interfering effects of mistletoe alkali
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    摘要:

    目的 探讨瘦素调控大鼠肝纤维化的信号转导机制及槲寄生碱的干预作用。方法 以CCl4诱导的肝纤维化大鼠模型为研究对象,45只大鼠随机分为三组,分别为对照组、模型组、药物干预组。对照组不做任何处理,自由饮食、饮水;模型组和槲寄生碱治疗组分别腹腔注射40%CCl4-植物油溶液2 mL/kg,每周2次,共8周。实验第9周,治疗组经灌胃给予大鼠槲寄生碱8g/(kg·d),模型组灌胃给予等剂量的生理盐水,共8周。实验第17周颈椎脱臼法处死所有动物,取出肝脏左前叶。采用HE染色、MASSON染色方法观察槲寄生碱对肝纤维化大鼠肝组织形态学的影响;免疫组织化学的方法观察槲寄生碱对大鼠肝星状细胞瘦素及瘦素受体的影响。Western Blot法检测大鼠肝脏组织JAK2、STAT3蛋白水平以及JAK2、STAT3蛋白磷酸化水平。结果 肝脏大体、HE染色以及Masson胶原染色结果提示:大鼠肝纤维化模型复制成功,槲寄生碱具有阻断逆转肝纤维化的作用。免疫组织化学染色显示,与模型组比较,槲寄生碱明显抑制模型大鼠肝组织瘦素、瘦素受体的表达。Western Blot显示,正常对照组JAK2、STAT3蛋白表达量最少;模型组JAK2、STAT3蛋白高表达;而药物处理组的JAK2、STAT3蛋白表达明显下调。结论 槲寄生碱可有效逆转大鼠肝脏纤维化,其作用机制可能是通过下调大鼠肝组织瘦素、瘦素受体的表达, 进而影响JAK2/STAT3信号通路来完成的。

    Abstract:

    Objective To investigate the signal transduction pathway mechanisms of rats with liver fibrosis regulated by leptin and interfering effects of mistletoe alkali.Methods The hepatic fibrosis in rats model was established by injecting carbon tetrachloride. Forty-five SD rats were randomly divided into normal group,model group and therapeutic group. All rats except rats in normal group were intraperitoneally injected with 40% carbon tetrachloride in peanut oil with a dose of 2.0 mL/100g according to the body weight twice a week for 8 weeks. Then, the therapeutic group was given mistletoe alkali(8g/(kg·d)) for 8 weeks via gastrogavage. Rats in normal and model group were served with distilled water at the same time. At the end of the 16th week, blood and tissue specimens were taken from all the rats. The influence of mistletoe alkali on liver morphology in liver fibrosis rat model was reviewed by HE and Masson staining. The effects of mistletoe alkali on the expression of Leptin and its receptor(OB-Rb) in HSC in fibrosis rat model were determined by immunohistochemistry(IH). The expression of JAK2, STAT3 and the activity of phospho-JAK2, phospho-STAT3 were detected by Western blotting analysis. Results The degree of fibrosis of the model group was more severe than the normal group and the treatment group, which suggested that mistletoe alkali can reverse liver fibrosis in rats. Immunohistochemical staining showed that mistletoe alkali reduced the hepatic expression of leptin and OB-Rb in rats with liver fibrosis in comparison with their expression in the model group. Compared with the normal group, the expression of JAK2 and STAT3 increased in the model group. However, the expression of JAK2 and STAT3 decreased in the medication groups compared with the model group. Conclusion Mistletoe alkali can effectively ameliorate liver fibrosis in rats possibly through inhibiting hepatic leptin and its receptor expressions, which through inhibiting hepatic leptin and its receptor expressions, thus inhibit the JAK2/STAT3 signaling pathway.

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孟霞,王学丛,丰平,卢静,王学江.瘦素对大鼠肝纤维化的信号转导调控及槲寄生碱的干预作用[J].中国比较医学杂志,2015,25(10):1~6.

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  • 最后修改日期:2015-08-19
  • 在线发布日期: 2015-11-04
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