天津医药 ›› 2015, Vol. 43 ›› Issue (7): 728-732.doi: 10.11958/j.issn.0253-9896.2015.07.007

• 实验研究 • 上一篇    下一篇

利拉鲁肽对 2 型糖尿病阿尔茨海默病样三重转基因小鼠学习记忆的影响

孙洁,陈书仪,路素素,郑军,邓艳秋   

  1. 天津医科大学基础医学院生理学与病理生理学教研室 (邮编300070
  • 收稿日期:2015-01-21 修回日期:2015-03-23 出版日期:2015-07-15 发布日期:2015-07-15
  • 通讯作者: 邓艳秋 E-mail:dengyanqiu66@gmail.com E-mail:sjdwgyx@126.com
  • 作者简介: 孙洁 (1988), 女, 硕士在读, 主要从事神经退行性变研究
  • 基金资助:
    国家自然科学基金资助项目 (81270422

The effects of liraglutide on learning and memory in Alzheimer-like triple transgenic mice with type 2 diabetes

SUN Jie, CHEN Shuyi, LU Susu, ZHENG Jun, DENG Yanqiu   

  1. Department of Physiology and Pathophysiology, School of Basic Medical Science, Tianjin Medical University, Tianjin 300070, China
  • Received:2015-01-21 Revised:2015-03-23 Published:2015-07-15 Online:2015-07-15
  • Contact: DENG Yanqiu E-mail:dengyanqiu66@gmail.com E-mail:sjdwgyx@126.com

摘要: 目的 研究 2 型糖尿病 (T2DM) 对阿尔茨海默病 (AD) 样 APP/PS1/Tau 三重转基因 (3×Tg) 小鼠学习记忆能力的影响和利拉鲁肽 (LIR) 对此模型神经保护作用的相关机制。方法 1 月龄 C57BL/6 小鼠设为正常对照 (WT组, 1 月龄 3×Tg 小鼠分为对照(Tg)组、 单纯利拉鲁肽(Tg+LIR)组、 Tg+T2DM 组、 T2DM+利拉鲁肽(Tg+T2DM+LIR组。T2DM 造模方法为喂 2 个月高脂高糖饲料, 然后腹腔注射链脲佐菌素(STZ), 空腹血糖大于 7 mmol/L 为造模成功, 腹腔注射 LIR 治疗 2 个月。5 月龄时测体质量、 空腹血糖。Morris 水迷宫检测空间学习记忆能力, Western blotting 检测 Tau、 神经丝 (NFs) 和胰岛素受体底物 (IRS) 磷酸化水平。ELISA 检测转入的人 APP 基因表达的人β淀粉样蛋白(42, 检测 LIR 的影响。结果 Tg 组比较, Tg+T2DM 组小鼠质量、 空腹血糖、 逃避潜伏期、 pT231pT181SMI31Aβ42 增加, 穿越隐匿平台次数及 pIRS 减少。LIR 能减轻高脂高糖饮食及 T2DM 造成的体质量和血糖的增加, 能缓解 T2DM 3×Tg 小鼠空间学习记忆能力的损伤, 改善 T2DM 3×Tg 小鼠 TauNFs IRS 蛋白磷酸化的影响, 减少 3×Tg 小鼠的 沉积。结论 T2DM 会加重 3×Tg 小鼠的 AD 样症状, 而 LIR 对其有保护作用。

关键词: 阿尔茨海默病, 糖尿病, 2 型, 淀粉样β蛋白, 胰岛素抵抗, 利拉鲁肽, Tau, 胰岛素受体底物, 神经丝

Abstract: Objective To investigate the effects of type 2 diabetes on learning and memory of APP/PS1/Tau triple transgenic (3×Tg) mice of Alzheimers disease, and the protective mechanism of liraglutide (LIR) thereof. Methods One month old C57BL/6 mice were set to be control group (WT). One month old 3×Tg mice were divided into control group (Tg), liraglutide group (Tg+LIR), type 2 diabetes group (Tg+T2DM) and liraglutide treatment group (Tg+T2DM+LIR). The model of T2DM was established by feeding the high fat and sugar fodder, and then injecting streptozotocin (STZ) in mice, making sure the fasting blood glucose was more than 7 mmol/L. Then the subcutaneous injection of LIR was administered for 2 months. The values of body weight and fasting blood glucose were detected at age of 5-month. Morris water maze was applied to evaluate the spatial learning and memory ability. Western blotting assay was used to measure the levels of phosphorylated Tau, neurofilament (NFs) and insulin receptor substrates. ELISA was used to detect the human Aβ 42 to evaluate the effect of LIR on -amyloid. Results LIR can reduce body weight and blood glucose, can alleviate spatial learning and memory damaging caused by T2DM, and also can improve phosphorylated Tau levels, NFs and insulin receptor substrates caused by
T2DM, and finally can reduce the deposition of β-amyloid of 3×Tg mice. Conclusion T2DM can aggravate symptoms of AD in 3×Tg mice, and LIR has a protective effect on it.

Key words: Alzheimer disease, diabetes mellitus, type 2, amyloid beta-protein, insulin resistance, liraglutide, Tau, insulin receptor substrate, neurofilaments