微细胞到神经元的信号增加了脂质滴体代谢,增强了神经元网络活动
Ana P Verduzco Espinoza1, Na Na1, Loraine Campanati1
1Department of Neuroscience, The Scripps Research Institute, La Jolla, San Diego, CA, USA.
bioRxiv : the preprint server for biology
|August 6, 2025
概括
炎症性微质细胞改变神经元功能,APOE4增加了刺激能力. 微质衍生的外体和脂质滴体代谢介导这种沟通,影响神经退行性疾病,如阿尔茨海默氏症.
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
- 神经炎症是一种神经炎症.
背景情况:
- 微质细胞对神经元电路可塑性至关重要;它们的功能障碍有助于神经炎症和神经退行性疾病,如阿尔茨海默病 (AD).
- 阿波利波蛋白E4 (APOE4) 基因型是阿尔茨海默病最强的遗传风险因素,影响微质激活和神经元刺激性.
- 在炎症期间与神经元进行微质通信的精确机制以及APOE4在这一过程中的作用仍然不清楚.
研究的目的:
- 研究微质炎症状态如何影响神经元电路功能.
- 确定APOE基因型在微质和神经元中对在炎症期间神经元活动的微质调节的独立贡献.
- 阐明脂质代谢和细胞间通信在调解这些效应中的作用.
主要方法:
- 利用人类诱导多能干细胞 (iPSC) 衍生的微质和神经元单种植物.
- 使用成像来评估神经网络活动,以响应从脂聚糖 (LPS) 刺激的微质中获得条件介质 (CM) 的反应.
- 分析了APOE基因型对微质CM,神经元反应,外体介导通信和脂滴 (LD) 代谢的影响.
主要成果:
- 来自LPS刺激的微质细胞的CM增加了神经网络活动;APOE4微质细胞CM诱导的发射速度高于APOE3CM.
- 无论是APOE3和APOE4神经元都对CM做出了反应,但APOE4神经元的前突触点与APOE4微质CM增加.
- 微质衍生外体调解了网络活动的增加,这与脂肪滴体代谢的增加有关;阻断LD代谢取消了活动.
结论:
- 微细胞与神经元之间的通信驱动了神经元电路功能的炎症诱导的变化.
- 神经细胞的脂质滴在调节网络活动中起作用.
- 通过改变微质沟通和脂质代谢,APOE4可能会增加神经元刺激性,这有助于AD的发病.
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