上海交通大学学报(医学版)

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Roux-en-Y胃转流术对糖尿病大鼠骨骼肌脂肪酸氧化和胰岛素抵抗的变化研究

加孜热亚·再依拿提,孙洪林,朱超霞,范梦霞,仓桢,陆颖理   

  1. 上海交通大学 医学院附属第九人民医院内分泌科, 上海 200011
  • 出版日期:2015-05-28 发布日期:2015-06-04
  • 通讯作者: 陆颖理, 电子信箱: luyingli2008@126.com。
  • 作者简介:加孜热亚·再依拿提(1986—), 女, 哈萨克族, 硕士生; 电子信箱: janet87z@163.com。
  • 基金资助:

    国家自然科学基金(81270885)

Effects of Roux-en-y gastric bypass surgery on variations of fatty acid oxidation of skeletal muscle and insulin resistance of diabetic rats

Jiazireya·Zaiyinati, SUN Hong-lin, ZHU Chao-xia, FAN Meng-xia, CANG Zhen,  LU Ying-li   

  1. Department of Endocrinology and Metabolism, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China
  • Online:2015-05-28 Published:2015-06-04
  • Supported by:

    National Natural Science Foundation of China, 81270885

摘要:

目的 Roux-en-Y胃转流术(RYGB)对2型糖尿病胰岛素抵抗的影响及其骨骼肌脂肪酸氧化的变化。方法 观察糖尿病GK大鼠(糖尿病组)、行RYGB的糖尿病GK大鼠(RYGB干预组)和正常Wistar大鼠(正常对照组)的体质量、空腹血糖、空腹胰岛素、胰岛素抵抗指数、游离脂肪酸和骨骼肌脂肪酸氧化率的变化情况,大鼠骨骼肌用枸橼酸铅电子染色,透射电子显微镜下观察3组大鼠骨骼肌微结构和线粒体的改变。结果 与糖尿病组相比,RYGB干预组血清游离脂肪酸浓度有下降的趋势,骨骼肌脂肪酸氧化率增加,体质量、空腹血糖、空腹胰岛素和胰岛素抵抗指数的改善均较明显(P<0.05)。RYGB干预组、糖尿病组和正常对照组的骨骼肌脂肪酸氧化率分别为(4.75±1.03)%、(1.9±0.27)% 和(2.67±0.53)%。糖尿病组与正常对照组比较以及RYGB干预组与糖尿病组比较差异均有统计学意义(P<0.05)。与正常对照组大鼠比较,糖尿病组的骨骼肌组织肌丝结构紊乱,形成溶解性空泡,线粒体数量减少,明显肿胀,可见坏死呈空泡状的局部变性;RYGB干预组与糖尿病组比较,骨骼肌组织肌节结构排列和线粒体数量均有明显改善。结论 RYGB可通过减少血清游离脂肪酸和保护骨骼肌脂肪酸氧化功能改善糖尿病大鼠的胰岛素抵抗。

关键词: 胰岛素抵抗, Roux-en-Y胃转流术, 骨骼肌, 脂肪酸氧化, 2型糖尿病

Abstract:

Objective To investigate the effects of Roux-en-Y gastric bypass surgery (RYGB) on the insulin resistance of type 2 diabetes and the variation of fatty acid oxidation of skeletal muscle. Methods The variations of body weight, fasting blood glucose, fasting insulin, insulin resistance index, free fatty acid, and fatty acid oxidation rate of skeletal muscle of diabetic GK rats (diabetic group), diabetic GK rats underwent RYGB (RYGB intervention group), and normal wistar rats (control group) were observed. Lead citrate electronic staining was adopted to stain the skeletal muscle of the rats. The variations of micro-structure and mitochondria of the skeletal muscle of 3 groups were observed under the transmission electronic microscope. Results Compared with the diabetic group, the level of serum free fatty acid of the RYGB intervention group tended to decrease; fatty acid oxidation rate of the skeletal muscle increased; and body weight, fasting blood glucose, fasting insulin, and insulin resistance index improved significantly (P<0.05). The fatty acid oxidation rate of the skeletal muscle of RYGB intervention group, diabetic group, and control group were (4.75±1.03)%, (1.9±0.27)%, and (2.67±0.53)%, respectively. The differences of the diabetic group and control group, and the RYGB intervention group and diabetic group were statistically significant (P<0.05). Compared with the control group, the myofilament structure of skeletal muscle of the diabetic group was disorder; soluble cavitations appeared; the number of mitochondria decreased; swelling was obvious; and local degeneration of vesicular necrosis was found. Compared with the diabetic group, the sarcomere arrangement of skeletal muscle and the number of mitochondria of the RYGB intervention group were significantly improved. Conclusion RYGB may relieve the insulin resistance of diabetic rats by decreasing the level of serum free fatty acid and protecting the function of fatty acid oxidation of skeletal muscle.

Key words: insulin resistance, Roux-en-Y gastric bypass surgery, skeletal muscle, fatty acid oxidation, type 2 diabetes