人类t神经元揭示了与衰老相关的蛋白质稳定缺陷,导致阿尔茨海默氏症的表型
Ching-Chieh Chou1, Ryan Vest2,3,4, Miguel A Prado5,6
1Department of Biology, Stanford University, Stanford, California, USA.
Research square
|June 10, 2024
概括
老化的神经元由于蛋白质稳定和溶酶体功能受损而发展出阿尔茨海默病 (AD) 的特征. 提高溶酶体功能可能会减轻与AD相关的炎症和蛋白质沉积.
科学领域:
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
- 衰老研究研究 衰老研究
背景情况:
- 老龄化是阿尔茨海默病 (AD) 的一个主要风险因素.
- 将衰老与AD神经元表型联系在一起的细胞机制尚未完全理解.
- 粉样质斑块/神经纤维状结和器官缺陷都与阿尔茨海默病有关.
研究的目的:
- 为了研究衰老,器官缺陷和阿尔茨海默病表型之间的关系.
- 探索蛋白质稳定和溶酶体恒常在阿尔茨海默病发病过程中的作用.
- 为了研究这些机制,利用人类转基因神经元 (tNeuron) 模型.
主要方法:
- 从人类皮肤纤维细胞生成患者衍生的转基因神经元 (t神经元).
- 对t神经元进行定量蛋白质组分析,以确定衰老和AD相关的缺陷.
- 评估溶酶体功能,ESCRT介导的修复和t神经元中的炎症反应.
- 用酶体功能增强化合物治疗t神经元.
主要成果:
- 来自患者的t神经元重现了衰老的特征和AD相关的缺陷.
- 鉴定出蛋白质稳定和溶酶体平衡的缺陷,特别是在内分体-溶酶体组件中.
- 老年和ADt神经元显示出恶化的溶酶体损伤,ESCRT修复功能受损,炎症性细胞因子分泌量增加.
- 溶酶体功能障碍导致自发的Aβ和酸沉积物形成,类似于AD病理.
- 放酶增强化合物减少了炎症性细胞因子和Aβ沉积物.
结论:
- 蛋白质稳定和器官缺陷是启动神经元衰老和AD表型的上游因素.
- 溶酶体功能障碍是驱动AD病变的中心机制.
- 向 lysosomal 功能对于阿尔茨海默病具有治疗潜力.
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