中国神经再生研究(英文版) ›› 2017, Vol. 12 ›› Issue (9): 1499-1506.doi: 10.4103/1673-5374.215261

• 原著:退行性病与再生 • 上一篇    下一篇

阻断β2-肾上腺素能受体可抑制阿尔茨海默病小鼠海马神经元树突分裂

  

  • 收稿日期:2017-08-20 出版日期:2017-09-15 发布日期:2017-09-15
  • 基金资助:

    江苏省的脑疾病的生物信息学重点实验室项目(Jsbl1202)

Blocking beta 2-adrenergic receptor inhibits dendrite ramification in a mouse model of Alzheimer’s disease

Qin Wu1, 2, Jin-xia Sun2, Xiang-he Song2, Jing Wang2, Cun-quan Xiong2, Fei-xiang Teng2, Cui-xiang Gao2   

  1. 1 Jiangsu Key Laboratory of Brain Disease Bioinformation, Xuzhou Medical College, Xuzhou, Jiangsu Province, China
    2 College of Medical Technology, Jiangsu Vocational College of Medicine, Yancheng, Jiangsu Province, China
  • Received:2017-08-20 Online:2017-09-15 Published:2017-09-15
  • Contact: Cui-xiang Gao,fudan_qinwu@126.com.
  • Supported by:

    This work was financially supported by the Key Laboratory of Brain Disease Bioinformation of Jiangsu Province of China, No.sbl1202.

摘要:

神经元树枝状分枝可影响突触强度,在记忆过程中发挥重要作用。已有研究表明β2肾上腺素受体功能障碍与阿尔茨海默病发病具有相关性,然而其分子机制仍不清楚。为此,实验设计构建淀粉样蛋白前体蛋白/早老素1双转录(AD-TG)阿尔茨海默病小鼠模型,观察β2肾上腺素能受体选择性拮抗剂ICI118551对淀粉样β蛋白沉积物和阿尔茨海默病相关认知障碍的潜在影响。Morris水迷宫试验结果显示,用ICI118551处理的AD-TG小鼠的记忆能力明显差于未处理对照组,提示β2肾上腺素能受体被ICI118551阻断后,可减弱小鼠的学习和记忆能力;高尔基染色和免疫组织化学染色检测发现,β2肾上腺素能受体被ICI118551阻断后,明显抑制海马神经元的树突分裂的增多,而且伴随海马突触素1和突触素表达的下调;Western blot分析发现,β2肾上腺素能受体被ICI118551阻断后,海马 α-分泌酶活性下调,淀粉样蛋白前体蛋白的磷酸化增加,淀粉样β蛋白积累增加。实验结果证实,阻断阿尔茨海默病模型小鼠β2肾上腺素能受体可抑制海马神经元的树突分裂。

orcid:0000-0003-3857-1215(Cui-xiang Gao)

关键词: 神经再生, 神经退行性变, &beta, 2肾上腺素能受体, 阿尔茨海默氏病, 淀粉样&beta, 蛋白, ICI 118551, 认知功能, 树枝状分枝, 突触蛋白1, 突触素, &alpha, -分泌酶, 淀粉样蛋白前体蛋白

Abstract:

Dendrite ramification affects synaptic strength and plays a crucial role in memory. Previous studies revealed a correlation between beta 2-adrenergic receptor dysfunction and Alzheimer’s disease (AD), although the mechanism involved is still poorly understood. The current study investigated the potential effect of the selective β2-adrenergic receptor antagonist, ICI 118551 (ICI), on Aβ deposits and AD-related cognitive impairment. Morris water maze test results demonstrated that the performance of AD-transgenic (TG) mice treated with ICI (AD-TG/ICI) was significantly poorer compared with NaCl-treated AD-TG mice (AD-TG/NaCl), suggesting that β2-adrenergic receptor blockage by ICI might reduce the learning and memory abilities of mice. Golgi staining and immunohistochemical staining revealed that blockage of the β2-adrenergic receptor by ICI treatment decreased the number of dendritic branches, and ICI treatment in AD-TG mice decreased the expression of hippocampal synaptophysin and synapsin 1. Western blot assay results showed that the blockage of β2-adrenergic receptor increased amyloid-β accumulation by downregulating hippocampal α-secretase activity and increasing the phosphorylation of amyloid precursor protein. These findings suggest that blocking the β2-adrenergic receptor inhibits dendrite ramification of hippocampal neurons in a mouse model of AD.
 

Key words: nerve regeneration, neurodegeneration, beta-2 adrenergic receptor, Alzheimer’s disease, amyloid-β, ICI 118551, cognitive function;dendrite ramification, synapsin 1, synaptophysin, α-secretase, amyloid precursor protein, neural regeneration