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从受损的溶酶体中释放的会触发压力颗粒的形成,从而促进细胞的生存
Aravinth Kumar Jayabalan1,2, Aanuoluwakiitan Ayeni1,2, Jingyue Jia1,2
1Center for Global Health, Department of Internal Medicine, University of New Mexico Health Sciences Center, Albuquerque, NM, USA.
Autophagy
|February 18, 2025
概括
损坏的溶酶体释放,触发压力颗粒 (SG) 的形成,并保护细胞免受死亡. 这一发现将膜结合的溶解体与没有膜的SG联系在一起,这对细胞防御和疾病至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 机体生物学 机体生物学
背景情况:
- 溶解体是细胞平衡的重要器官,参与降解和信号传递.
- 溶解体膜损伤可以导致各种疾病,包括感染,癌症和神经退行.
- 压力颗粒 (SGs) 参与了细胞对压力的防御,包括溶酶体损伤,但潜在的机制尚不清楚.
研究的目的:
- 阐明 lysosomal 损伤触发压力颗粒形成的机制.
- 研究信号传导在调解这种反应中的作用.
- 了解压力颗粒的形成如何保护细胞免受 lysosomal 损伤引起的死亡.
主要方法:
- 研究了信号通路在溶酶体损伤的下游.
- 使用蛋白质相互作用研究来确定关键介质 (PDCD6IP/ALIX,PDCD6/ALG2).
- 研究了蛋白质激酶EIF2AK2/PKR及其激活剂PRKRA/PACT在翻译调节中的作用.
- 评估了在各种压力条件下SG形成缺陷对细胞存活的影响.
主要成果:
- 从受损的溶酶体中泄漏的开始招募PDCD6IP/ALIX和PDCD6/ALG2.2.
- 这个复合体激活EIF2AK2/PKR和PRKRA/PACT,导致EIF2S1的酸化和全球翻译启动.
- 翻译停止的结果是从不活跃的信使核糖蛋白复合体 (mRNP) 中形成应力颗粒 (SG).
- 缺乏SG形成的细胞在暴露于各种 lysosomal 损伤剂时死亡率增加.
结论:
- 溶酶体损伤信号通过诱导SG组装,一个保护性的细胞反应.
- 这一途径涉及一种新的机制,将信号,翻译控制和SG形成联系起来.
- 这些发现揭示了 lysosomes 和 SGs 之间的关键联系,这对与器官功能障碍相关的疾病有影响.
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