通过短暂的内分泌体穿孔启用的神经元中的tau播种被限制在内分泌体内
Anwesha Sanyal1,2, Gustavo Scanavachi1,2, Elliott Somerville2
1Department of Cell Biology, Harvard Medical School, 200 Longwood Ave, Boston, MA 02115, USA.
bioRxiv : the preprint server for biology
|November 24, 2025
概括
病原性种子聚集在神经元中的完好无损的内分泌体内,而不是细胞质中. 这个过程需要PIKfyve,并且涉及过渡性内分泌体穿孔,为神经退行性疾病提供治疗点.
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
- 生物化学 生物化学
背景情况:
- 致病性聚合物通过模板播种传播.
- 内细胞化纤维需要内溶体膜破裂才能获得细胞质的访问和聚合.
- 了解的播种机制对于神经退行性疾病研究至关重要.
研究的目的:
- 为了研究内化种子进入神经元的路径.
- 为了确定tau总体生长的细胞部位.
- 探索针对陶氏种植的治疗策略.
主要方法:
- 人类诱导的多能干细胞衍生神经元 (iNs) 的实时成像,表达tau P301L-eGFP.
- 暴露于重组预形成纤维素 (PFFs) 或阿尔茨海默病 (AD) 脑衍生物种子.
- 使用pH生物传感器和内分泌体修复报告器进行局部化研究.
- 卷聚焦离子束扫描电子显微镜.
- HaloTag脉冲追踪测定用于跨膜访问.
- 使用apilimod对PIKfyve进行药理抑制.
主要成果:
- 种植的tau聚合发生在iNs的后期内体/溶解体内,而不是在未分化的iPSC中.
- 聚合物保持在完好无损的,低pH的内分泌体区内;没有观察到细胞聚合物.
- 内分泌体损伤和修复标记保持不变.
- 经常发生的,自我限制的访问事件,而不是持续的破裂,解释了细胞突变α-synuclein的跨膜招募.
- 阿皮利莫德抑制了种植的陶聚合,并防止了神经元毒性.
结论:
- 模板化tau转换发生在酸性,膜完好无损的内分泌体内.
- 神经种植涉及暂时的,自我限制的内分泌体穿孔,但仍然局限于光线.
- 对于TAU播种和神经元毒性,需要依赖PIK的PI(3,5) P2.
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