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通过拼接失调,TDP-43有毒的功能增益与ALS,FTD和阿尔茨海默病联系在一起
bioRxiv : the preprint server for biology
|July 14, 2025
概括
阿尔茨海默病 (AD) 中的TDP-43蛋白病理导致粉样蛋白前体蛋白 (APP) 的异常拼接,通过共享机制将AD和ALS/FTLD联系起来. 这种功能障碍是由有毒的细胞质TDP-43引起的,而不是核功能丧失.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- TDP-43 (TAR DNA结合蛋白 43) 功能障碍在像ALS和FTLD这样的神经退行性疾病中很常见.
- 它在阿尔茨海默病 (AD) 发病过程中的作用,特别是关于拼接,尚不清楚.
研究的目的:
- 为了调查TDP-43病理和AD的拼接异常之间的联系.
- 阐明TDP-43影响粉样蛋白前体蛋白 (APP) 拼接并导致神经退行的机制.
主要方法:
- 在AD患者样本中分析TDP-43病理和拼接.
- 利用人类iPSC衍生的神经元进行近距离蛋白质组学和基数编辑实验.
- 研究TDP-43与拼接监管器 (SCAF11,SRSF5,TIAL1) 联合封存对APP拼接的影响.
主要成果:
- 在AD中的TDP-43病理与广泛的拼接异常有关,包括异常的APP拼接.
- TDP-43驱动了长长的APP异型的形成,破坏了ALS,FTLD-TDP和AD的替代拼接.
- APP错误拼接和A-β负荷增加的结果是有毒的细胞质TDP-43功能增强,而不是核损失,导致拼接调节器的共隔离.
结论:
- 在APP上游的TDP-43介导的拼接功能障碍有助于AD,ALS和FTLD-TDP的发病.
- 这种共同的分子机制将看似不同的神经退行性疾病结合在一起.
- 准TDP-43的细胞质功能为多种神经退行性疾病提供了潜在的治疗策略.
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