冠状蛋白1A 调节微质中阿尔法同核素的贩运
Karl E Biggs1,2, Emma N Fikse1, Faith L Anderson1
1Departments of Molecular and Systems Biology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire 03766.
概括
微质中的冠状蛋白1A (Coro1A) 通过将蛋白质聚合物从 lysosomes 移开来保护帕金森病的α-synuclein 毒性. 失去Coro1A会增加细胞死亡和炎症酶激活.
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
- 免疫学 免疫学 免疫学
背景情况:
- 微质细胞,大脑的免疫细胞,在像帕金森氏症这样的神经退行性疾病中对有毒的蛋白质聚合物作出反应.
- 微质中NLRP3炎症酶的激活会导致炎症和细胞死亡.
- 阿尔法-同核素 (αsyn) 预制纤维素 (PFFs) 是帕金森病中关键的病理性蛋白质聚合物.
研究的目的:
- 研究Coro1A在微质对αsyn PFFs的反应中的作用.
- 确定微质细胞处理病态蛋白质聚合物的细胞机制.
- 为了探索Coro1A在帕金森病病原发生过程中的参与.
主要方法:
- 主要小鼠微质细胞暴露于微生物压力和αsyn PFFs.
- 微质释放的细胞外囊泡 (EVs) 被分析到Coro1A含量.
- 在Coro1A缺乏的微质中评估了αsyn贩运,溶酶体完整性和细胞死亡途径.
- 来自帕金森病患者的死后人类大脑组织被分析.
主要成果:
- 在一般激活下,微细胞以NLRP3依赖的方式在EV中释放Coro1A,但令人惊的是,与αsyn PFFs没有.
- 微质中Coro1A的损失会导致酶对溶解体的转移增加,从而导致溶解体膜透.
- 由于Coro1A缺乏,PFF诱导的细胞毒性增强,细胞质甲素B升高,以及PARP裂变产物.
- 在人类帕金森病大脑中,中大脑中观察到较高的Coro1A蛋白水平.
结论:
- Coro1A充当一个关键的调节器,将病理性αsyn从溶解体转移到通过EVs的分泌途径,从而减轻溶解体应激.
- 微质中Coro1A功能的丧失加剧了αsyn诱导的溶酶体损伤和细胞毒性,导致神经退行.
- 这些发现凸显了Coro1A在微质中对炎性酶激活和热性细胞死亡的保护作用,这与帕金森病的进展有关.
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