中国组织工程研究 ›› 2021, Vol. 25 ›› Issue (11): 1723-1727.doi: 10.3969/j.issn.2095-4344.3074

• 组织构建实验造模 experimental modeling in tissue construction • 上一篇    下一篇

中等强度跑台运动干预2型糖尿病模型大鼠肝脏α-SMA和Ⅳ型胶原的变化

扈  盛1,袁海燕2,胡  萌1,金山虎3   

  1. 武汉体育学院,1健康科学学院,2体育科技学院,3运动康复研究中心,湖北省武汉市   430079
  • 收稿日期:2020-02-11 修回日期:2020-02-20 接受日期:2020-03-30 出版日期:2021-04-18 发布日期:2020-12-21
  • 通讯作者: 扈盛,博士,硕士生导师,教授,武汉体育学院健康科学学院,湖北省武汉市 430079
  • 作者简介:扈盛,男,1971年生,博士,硕士生导师,教授,主要从事运动医学临床治疗、体质监测及运动处方、生物医用材料在运动医学骨科等方面的研究。
  • 基金资助:
    国家重点研发计划“科技冬奥”重点专项扩展项目(2019YFF0301703),项目参与人:扈盛

Effects of moderate treadmill exercise on alpha-smooth muscle actin and type IV collagen in the liver of type 2 diabetic rats

Hu Sheng1, Yuan Haiyan2, Hu Meng1, Jin Shanhu3   

  1. 1Health Science College, 2Sports Science and Technology College, 3Sports Rehabilitation Research Center, Wuhan Sports University, Wuhan 430079, Hubei Province, China
  • Received:2020-02-11 Revised:2020-02-20 Accepted:2020-03-30 Online:2021-04-18 Published:2020-12-21
  • Contact: Hu Sheng, Health Science College, Wuhan Sports University, Wuhan 430079, Hubei Province, China
  • About author:Hu Sheng, MD, Master’s supervisor, Professor, Health Science College, Wuhan Sports University, Wuhan 430079, Hubei Province, China
  • Supported by:
    the National Key Research and Development Project of China, No. 2019YFF0301703 (to HS [project participant])

摘要:

文题释义:
链脲佐菌素诱导:是一种氨基葡萄糖-亚硝基脲,能通过葡萄糖转运蛋白独自进入细胞,其对动物胰岛β细胞的毒性作用有着高度选择性,能够导致动物葡萄糖以及脂肪等代谢发生紊乱,影响葡萄糖激酶的活性,因此可作为糖尿病模型的工具药来诱导糖尿病的发生。
α-平滑肌肌动蛋白:作为细胞骨架蛋白,是肌成纤维细胞活化的典型标志。它通过跨膜复合物与成纤维细胞外纤维粘连蛋白相连,在致病因子刺激下成纤维细胞被激活,促进肝窦内皮细胞等表达大量肌性骨架蛋白,即α-平滑肌肌动蛋白,在其介导下使肝脏细胞外基质进一步增加,最终导致肝脏胶原沉积与纤维化。

背景:糖尿病导致的肝损害在早期阶段容易被忽视,运动疗法能够增加胰岛素的敏感性,是糖尿病防治的重要手段。
目的:探讨中等强度运动干预对糖尿病发生过程中肝损伤的影响。
方法:实验方案经武汉体育学院伦理委员会批准。选择30只SPF级SD大鼠,分为3组:正常对照组、糖尿病对照组、糖尿病运动干预组。①正常对照组:普通膳食喂养,不运动;②糖尿病对照组:高糖高脂膳食饲养8周后一次性小剂量腹腔注射链脲佐菌素(30 mg/kg),不运动;③糖尿病运动干预组:喂养及注射方式同糖尿病对照组,同时进行中等强度跑台训练。链脲佐菌素注射7 d后,苏木精-伊红染色及Masson染色进行肝细胞形态学观察,免疫组化法观察肝组织内α-SMA的表达,同时ELISA法检测血清Ⅳ型胶原水平。
结果与结论:①与正常对照组比较,苏木精-伊红染色显示糖尿病对照组大鼠肝小叶结构紊乱,可见大量脂肪空泡,汇管区胆小管发生明显增生;Masson染色显示出现脂肪空泡,肝小叶结构严重破坏,汇管区可见明显蓝染胶原纤维,肝细胞间可见轻度蓝染胶原纤维;上述病理变化在糖尿病运动干预组明显减轻,有效减少肝脏细胞的脂肪变性;②糖尿病对照组、糖尿病运动干预组α-SMA表达量较正常对照组明显增多(P < 0.05),糖尿病运动干预组较糖尿病对照组明显减少(P < 0.05);③糖尿病运动干预组大鼠Ⅳ型胶原水平明显低于糖尿病对照组(P < 0.05),可减缓纤维化的进程;④结果说明,中等强度运动对链脲佐菌素诱导的糖尿病大鼠肝脏纤维化有良好的干预作用。

https://orcid.org/0000-0002-5619-548X (扈盛) 

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程

关键词: 糖尿病, 运动, 中等强度, Ⅳ型胶原, 肌动蛋白, 肝脏, 纤维化, 组织工程

Abstract: BACKGROUND: Diabetes-induced liver damage is easy to be ignored in the early stage. Exercise therapy can increase the sensitivity of insulin, which is an important means of prevention and treatment of diabetes.
OBJECTIVE: To explore the effect of moderate intensity exercise intervention on liver injury during the occurrence of diabetes mellitus.
METHODS: The experimental protocol was approved by the Laboratory Animal Care Ethics Committee of Wuhan Sports University. Thirty SPF Sprague-Dawley rats were divided into three groups: normal control group, diabetic control group and diabetic exercise intervention group. Normal control group was fed with normal diet, with no exercise. Diabetes control group was fed with high sugar and high fat diet for 8 weeks, followed by a small dose of streptozotocin (30 mg/kg) injected intraperitoneally, with o exercise. Diabetes exercise intervention group was fed and injected in the same way as diabetes control group, and at the same time carried out moderate intensity treadmill training. After 7 days of streptozotocin injection, hematoxylin-eosin and Masson staining were used to observe the cell morphology, the expression of α-smooth muscle actin was observed by immunohistochemistry, and orbital blood samples were collected to detect the concentration of serum type IV collagen using ELISA.
RESULTS AND CONCLUSION: Compared with the normal control group, hematoxylin-eosin staining showed that the structure of liver lobule in the diabetic control group was disordered, a large number of fat vacuoles were seen, and the bile duct in the portal area was obviously proliferated; Masson staining that there were showed fat vacuoles, the structure of liver lobule was seriously damaged, and blue stained collagen fibers were seen in the portal area, and light blue stained collagen fibers were seen between liver cells. The above pathological changes were alleviated in the diabetic exercise intervention group, and the fatty degeneration of liver cells was obviously reduced. The expression of α-smooth muscle actin in the diabetic control group and diabetic exercise intervention group was significantly higher than that in the normal control group (P < 0.05), and that in the diabetic exercise intervention group was significantly lower than that in the diabetic control group (P < 0.05). The level of type IV collagen in the diabetic exercise intervention group was significantly lower than that in the diabetic control group (P < 0.05), to slow down the progress of fibrosis. To conclude, moderate intensity exercise has a good effect on streptozotocin induced liver fibrosis in diabetic rats.


Key words: diabetes, exercise, moderate intensity, type IV collagen, α-smooth muscle actin, liver, fibrosis, tissue engineering 

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