弧介于通过细胞外囊泡进行细胞间 tau 传输
Mitali Tyagi1, Radhika Chadha1, Eric de Hoog1
1Department of Neurobiology, University of Utah, Salt Lake City, USA.
bioRxiv : the preprint server for biology
|November 1, 2024
概括
神经元基因Arc将tau蛋白包装成细胞外囊泡 (EVs),这对于其在阿尔茨海默氏症等神经退行性疾病中细胞间传播至关重要. 弧形缺陷阻止了传输,并防止了神经元的损失.
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
- 分子生物学分子生物学
背景情况:
- 错误折叠的蛋白形成神经纤维状,在阿尔茨海默病 (AD) 和前性痴呆症 (FTD) 中驱动神经退行.
- 病理在细胞之间传播,但释放和细胞间传播的机制尚未完全理解.
- 可以作为自由蛋白质或在细胞外囊泡 (EVs) 中释放,在疾病进展中的作用尚不清楚.
研究的目的:
- 研究神经元基因Arc在释放和细胞间传播中的作用.
- 确定Arc是否影响电动汽车中的tau包装及其病理后果.
主要方法:
- 使用人类tau (hTau) 转基因小鼠 (rTg4510) 和Arc淘汰 (Arc KO) 模型.
- 从小鼠大脑中提取纯化的细胞外囊泡 (EVs),用于分析hTau含量和播种潜力.
- 使用生化和成像技术研究了Arc和hTau之间的相互作用.
- 在Arc KO小鼠中评估神经退行和细胞间tau传播.
主要成果:
- Arc对于包装tau进入EVs至关重要;Arc KO小鼠在EVs中的hTau显著降低,种植能力受损.
- Arc通过I-BAR蛋白IRSp53在EV中促进hTau的释放,但不会释放自由tau.
- 阿克直接与hTau结合,形成了在老鼠和人类大脑组织中发现的复合体.
- 在Arc KO小鼠中累积的病态细胞内hTau,与加速的海马神经元损失相关.
- 在Arc KO小鼠中,细胞间 tau 传播显著被废除.
结论:
- 通过EVs释放的弧度依赖性释放是细胞内消除的关键机制.
- 弧在细胞间tau传播中起着重要作用,影响神经退行性疾病的进展.
- 准Arc介导的EV释放可能是治疗病的治疗策略.
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