Plekhg5控制了Sod1的非传统分泌,通过前突触分泌自
Amy-Jayne Hutchings1, Bita Hambrecht1, Alexander Veh1
1Institute of Clinical Neurobiology, University Hospital Würzburg, Würzburg, Germany.
Nature communications
|October 4, 2024
概括
在神经元中,Plekhg5蛋白促进Sod1的非传统蛋白质分泌 (UPS). 运动神经元疾病模型中的Plekhg5功能受损会破坏Sod1分泌,影响疾病的进展.
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:
- 自在非传统蛋白质分泌 (UPS) 中发挥着作用.
- 神经元中分泌性自的机制,特别是对聚合性蛋白质的机制,尚不清楚.
- 运动神经元疾病通常与蛋白质聚合和失效分泌有关.
研究的目的:
- 为了阐明下层运动神经元中分泌性自的机制.
- 调查Plekhg5在Sod1.1非传统分泌中的作用.
- 探索Plekhg5,Sod1分泌和运动神经元疾病病原体之间的联系.
主要方法:
- 使用了具有Plekhg5删除和SOD1G93A突变的小鼠模型.
- 使用人类诱导的多能干细胞 (iPSC) 衍生的运动神经元.
- 研究了将蛋白质绑定到自细胞和与溶解体相关器官细胞 (LROs) 融合.
- 分析了Rab26激活和LRO外细胞分裂.
主要成果:
- Plekhg5驱动Sod1的UPS,通过将其封存到与LROs融合的自细胞体中进行调节.
- 为了释放Sod1,LROs的外细胞分解需要Plekhg5激活的Rab26.5来释放Sod1.
- 在小鼠中Plekhg5的删除导致Sod1在LROs和突触前胀中的积累.
- 在Plekhg5缺乏的小鼠中,减少有毒SOD1G93A的分泌加速了疾病的发病,但通过减弱的微质激活延长了生存时间.
- 在人类iPSC衍生的运动神经元中降低了PLEKHG5水平,损害了与ALS相关的SOD1分泌.
结论:
- Plekhg5 是通过分泌自细胞在运动神经元中Sod1分泌的关键调节者.
- 功能障碍的Plekhg5-介导的Sod1分泌有助于运动神经元疾病的病理.
- 这条途径连接了两个与运动神经元疾病相关的蛋白质Plekhg5和Sod1,提供了潜在的治疗点.
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