病态的TDP-43丝在突触处积聚,导致突触功能障碍.
bioRxiv : the preprint server for biology
|February 9, 2026
概括
在FTD等神经退行性疾病的早期,TDP-43蛋白聚合物在突触中积聚,导致突触功能障碍和神经元过激动. 这项研究将TDP-43光纤积累与疾病进展和神经元损失联系起来.
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
- 病理学 病理学 病理学
背景情况:
- TDP-43聚合成粉样纤维是神经退行性疾病的关键特征,如运动神经元疾病 (MND) 和前性痴呆症 (FTD).
- 突触功能障碍和神经元过激动性是这些TDP-43蛋白质病变的早期病理事件.
- 虽然TARDBP基因的突变证实了TDP-43的作用,但丝积累的机制及其对神经退行的贡献仍然不清楚.
研究的目的:
- 为了研究神经元中TDP-43丝积累的早期阶段.
- 为了确定TDP-43纤维的分子相互作用和细胞位置.
- 了解TDP-43光纤积累如何影响突触功能和神经元刺激性.
主要方法:
- 通过小鼠和人类皮质神经元将患者衍生的TDP-43纤维内部化.
- 接近性标签,以识别TDP-43灯丝相互作用.
- 电子冷断层扫描 (cryo-ET) 用于在现场高分辨率成像TDP-43细丝.
- 突触活动和神经元刺激性的功能测量.
主要成果:
- 发现TDP-43丝在突触中积聚,特别是在前突触活性区附近,这一发现在FTD患者的大脑中得到了验证.
- 通过冷ET的直接可视化揭示了在前突触细胞质内存在的TDP-43丝,与突触囊泡和血膜相互作用.
- 积累的TDP-43细丝导致了前突触功能障碍和随后的神经元过激动.
结论:
- 突触是TDP-43光纤积累和传播的主要早期地点.
- 这项研究确立了TDP-43光纤功能增强和突触功能障碍之间的直接联系.
- 这些发现强调了突触病理在TDP-43蛋白病变中的关键作用.
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