激发性神经元中的TGR5缺陷通过调节APP处理来改善阿尔茨海默氏病理
Chenli Li1, Liangjie Wang1, Wenting Xie1
1Institute of Neuroscience, Department of Anesthesiology, First Affiliated Hospital, College of Medicine, Xiamen University, Xiamen, Fujian 361005, China.
Science advances
|June 28, 2024
概括
在早期阿尔茨海默氏症 (AD) 中,脱氧醇酸 (DCA) 的升高会通过一种新型信号通路,对塔凯达G蛋白合受体5 (TGR5) 进行上调,从而推动认知衰退和Aβ病理.
科学领域:
- 神经科学是一个神经科学.
- 生物化学 生化学
- 病理学 病理学 病理学
背景情况:
- 胆汁酸 (BAs) 代谢越来越多地被认为在神经退行性疾病中的作用.
- 在阿尔茨海默病 (AD) 发病过程中观察到BA特征的变化.
- 特定的BA及其受体与神经元功能和功能障碍有关.
研究的目的:
- 调查脱氧胆酸 (DCA) 和其受体在阿尔茨海默氏病 (AD) 早期阶段的作用 塔克达G蛋白结合受体5 (TGR5).
- 阐明将TGR5与AD病理联系起来的信号通路,包括粉样β (Aβ) 生产和认知障碍.
- 为了确定TGR5是否是AD的潜在治疗点.
主要方法:
- 在AD小鼠模型中,在疾病早期阶段量化DCA和TGR5.
- 向野生型和TGR5淘汰赛小鼠给予DCA以评估认知功能.
- 生成刺激神经元特异性TGR5淘汰赛小鼠,以评估AD病理.
- 对下游信号通路的分析,包括p-STAT3,APH1和γ-分泌酶,与TGR5激活相关.
主要成果:
- 脱氧胆酸 (DCA) 水平在早期AD小鼠的大脑中显著增加.
- 增加的DCA导致AD小鼠大脑神经元中TGR5的上调.
- 外源DCA在野生类型小鼠中的认知功能受损,这种效应在TGR5淘汰赛小鼠中被废除.
- 刺激性神经元特异性淘汰TGR5改善了AD小鼠的Aβ病理和认知缺陷.
- 一个新的信号通路",p-STAT3-APH1-γ-secretase"被确定为将TGR5与AD病理联系起来的机制.
结论:
- 塔凯达G蛋白结合受体5 (TGR5) 在阿尔茨海默病 (AD) 的病理发展中发挥着关键作用.
- 胆酸脱氧胆酸 (DCA) 通过TGR5.5调解AD相关的病理和认知障碍.
- 针对TGR5介导的"p-STAT3-APH1-γ-secretase"通路可能为阿尔茨海默病提供一种新的治疗策略.
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