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木瓜提取物对高糖高脂诱导的小鼠非酒精性脂肪性肝病的影响

2017-05-11吴利春涂浩段丽佘慧宇张伟张长城袁丁刘朝奇

中国中医药信息杂志 2017年5期
关键词:小鼠

吴利春 涂浩 段丽 佘慧宇 张伟 张长城 袁丁 刘朝奇

摘要:目的 观察木瓜提取物对小鼠非酒精性脂肪性肝病(NAFLD)的影响,探讨其可能的分子机制。方法 将40只雄性昆明小鼠随机分成正常组、模型组和药物低(50 mg/kg)、高(100 mg/kg)剂量组。正常组给予普通饲料,其他组给予高糖高脂饲养造模,4周后处死,检测体质量、肝脏质量、血清相关指标及肝脏三酰甘油(TG)水平,HE及油红O染色观察肝脏组织形态,RT-PCR和Western blot检测脂代谢相关基因表达。结果 与正常组比较,模型组小鼠肝脏明显增大,肝指数明显升高(P<0.01),附睾脂肪指数明显升高(P<0.05);血清丙氨酸氨基转移酶和葡萄糖水平升高(P<0.05);肝脏TG水平升高(P<0.05);病理结果显示,肝脏脂肪变性明显;RT-PCR和Western blot结果显示,模型组肝脏组织SIRT1、FoxO1表达水平下调,SERBP-1c表达水平上调。与模型组比较,药物低、高剂量组脂肪肝病理损伤明显改善,肝指数、肝脏TG含量均下降,SIRT1和FoxO1表达水平上调。结论 木瓜提取物对高糖高脂诱导的NAFLD有保护作用,其机制可能是通过SIRT1-FoxO1信号通路发挥作用。

关键词:木瓜提取物;非酒精性脂肪性肝病;脂质代谢;SIRT1信号通路;小鼠

DOI:10.3969/j.issn.1005-5304.2017.05.012

中图分类號:R285.5 文献标识码:A 文章编号:1005-5304(2017)05-0048-04

Effects of Extracted Active Components of Chaenomeles Speciosa on Non-alcoholic Fatty Liver Disease in Model Mice induced by High-fat–high-fructose Diet WU Li-chun1, TU Hao1, DUAN Li1, SHE Hui-yu2, ZHANG Wei1, ZHANG Chang-cheng2, YUAN Ding2, LIU Chao-qi1 (1. Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, Yichang 443002, China; 2. Medical College, China Three Gorges University, Yichang 443002, China)

Abstract: Objective To study the effects of extracted active components of Chaenomeles Speciosa (EACCS) on non-alcoholic fatty liver disease (NAFLD) in mice; To discuss the possible molecular mechanism. Methods Forty male KM mice were randomized into four groups, namely normal group, model group, low-dose (50 mg/kg) EACCS group and high-dose (100 mg/kg) EACCS group. Except that the normal group was daily given routine diet, the other groups were given high-fat–high-fructose diet (HFFD). The mice were put to death 4 weeks later. Body weight, liver weight and serum TG were measured. HE and oil red O staining were used to observe liver tissue morphology. RT-PCR and Western blot were used to detect the expression of lipid metabolism related genes. Results Compared with the normal group, the liver size, liver index (P<0.01) and epididymal fat index (P<0.05) increased significantly; The ALT and GLU in serum increased (P<0.05), TG increased (P<0.05), and pathological findings showed significant steatosis; RT-PCR and Western blot showed that the expression levels of SIRT1 and FoxO1 mRNA decreased and the level of SERBP-1c increased in the model group. Compared with the model group, the hepatic lipid accumulation of EACCS groups was obviously improved, and the serum ALT, GLU, and TG levels significantly decreased, the expression levels of hepatic SIRT1 and FoxO1 mRNA increased. Conclusion EACCS has protective effects on NAFLD mice induced by HFFD, and its mechanism may be related to the activation of SIRT1-FoxO1 signaling pathway in the liver tissues.

Key words: Chaenomeles Speciosa extracts; non-alcoholic fatty liver disease; lipid metabolism; SIRT1 signaling pathway; mice

非酒精性脂肪性肝病(non-alcoholic fatty liver disease,NAFLD)是指无饮酒或每周饮酒低于140 g,由其他各种原因导致的肝细胞脂肪变性,三酰甘油(TG)明显升高,进一步发展成脂肪性肝炎、肝纤维化甚至肝癌的一组临床综合征。随着我国居民生活水平不断提高,体力劳动减少,NAFLD发病率逐年上升,大、中城市普通成人的NAFLD发病率高达20%[1],至今尚无有效的干预措施。因此,急需寻找有效手段防治NAFLD。木瓜是蔷薇科植物贴梗海棠近成熟果实,味酸、性温、归肝脾经,具有祛湿舒筋、平肝和胃的作用[2]。本课题组前期研究发现,木瓜对小鼠NAFLD具有良好的干预作用[3]。为此,本实验对木瓜进行提取分离,进一步研究该药物有效成分对NAFLD的影响及其可能的作用机制。

1 材料与方法

1.1 动物及饲料

雄性昆明小鼠40只,SPF级,4~6周龄,体质量18~22 g,三峡大学实验动物中心。饲养于室温20~25 ℃、相对湿度50%~80%、明暗交替12 h/12 h環境,自由摄食饮水,每2 d称重1次。……

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