与膜相关的周期骨架通过信号驱动的正反循环调节神经元中主要形式的内细胞分裂
Jinyu Fei1, Yuanmin Zheng2, Caden LaLonde3
1Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, USA.
bioRxiv : the preprint server for biology
|December 25, 2025
概括
神经元膜关联周期性骨架 (MPS) 在特定区域封锁所有神经元内细胞突变. 破坏MPS增强了内细胞分裂,并通过调节粉样蛋白前体蛋白吸收来影响神经退行.
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:
- 细胞内核对神经元功能,平衡和响应能力至关重要.
- 与膜相关的周期骨架 (MPS) 限制了轴突中的克拉介导内细胞分裂 (CME).
- 在其他神经元区和内细胞通路中MPS的更广泛的作用基本上是未知的.
研究的目的:
- 研究MPS在关闭所有神经元区的各种内细胞通路中的作用.
- 阐明MPS干扰对神经元内细胞和信号传递的调节机制和功能后果.
- 确定MPS完整性,粉样蛋白前体蛋白 (APP) 内细胞分裂和神经退行之间的联系.
主要方法:
- 利用先进的显微镜技术可视化内细胞通路和神经元中的MPS组织.
- 采用遗传和药理方法来破坏MPS的结构和功能.
- 研究信号通路,包括ERK信号和蛋白酶活性.
- 在被MPS破坏的神经元中,量化内细胞酶率和APP处理.
主要成果:
- 所有主要的内细胞通路 (CME,caveolin-, flotillin-,快速内皮林介导) 都被MPS空间封闭,并且发生在MPS无区内.
- 对MPS的干扰显著增强了神经元区间的基底和连接体诱导的内细胞分裂.
- 确定了一个新的反循环,其中内细胞化激活ERK信号,导致MPS蛋白解和进一步的内细胞化.
- MPS的完整性限制了APP内细胞分裂,减少了Aβ42的产生,并表明它在神经保护中发挥了作用.
结论:
- 该MPS作为一个动态,信号响应调节器的神经元内细胞分裂在所有途径和区间.
- 干扰MPS通过一个反循环增强内细胞分裂,涉及ERK信号和光谱分裂.
- MPS完整性对于控制APP内细胞分裂,Aβ42产生和神经元健康至关重要,它将细胞骨组织与神经退行联系起来.
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