损坏的线粒体会招募效应器NEMO来激活NF-κB信号传递
Olivia Harding1, Elisabeth Holzer2, Julia F Riley1
1Department of Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Aligning Science Across Parkinson's (ASAP) Collaborative Research Network, Chevy Chase, MD 20815, USA.
Molecular cell
|September 8, 2023
概括
损坏的线粒体会触发天生的免疫反应. 核因子kappa B (NF-κB) 效应分子 (NEMO) 被招募到受损的线粒体中,启动与线粒细胞衰变并行的炎症信号通路.
科学领域:
- 细胞生物学 细胞生物学
- 免疫学 免疫学 免疫学
- 神经科学是一个神经科学.
背景情况:
- 线粒体,损坏的线粒体的清除,对于细胞健康至关重要.
- 功能障碍的线粒会导致炎症,但根本的机制尚未完全理解.
- 线粒体损伤信号与先天免疫之间的交叉需要进一步阐明.
研究的目的:
- 研究将受损线粒体与炎症信号联系起来的分子机制.
- 为了确定核因子kappa B (NF-κB) 基本调节器NF-κB效应分子 (NEMO) 在对线粒体损伤的反应中的作用.
- 探索这种途径的潜在神经炎症影响.
主要方法:
- 利用基于细胞的测试来追踪NEMO对受损线粒体的招募.
- 为了进行比较分析,采用了像optineurin (OPTN) 和p62/SQSTM1这样的线粒细胞吸食适配器.
- 研究了卡帕B激酶 (IKK) 复合物的抑制剂的激活以及随后的NF-κB信号传递.
- 在氧化应激下检查了NEMO在原发性星体中的线粒体招募.
主要成果:
- NEMO以帕金依赖的方式被招募到受损的线粒体中,并行于optineurin (OPTN) 的招募.
- 在受损的线粒体上,NEMO形成了明显的相分离凝结物,与p62/SQSTM1.1共定位.
- NEMO招募导致-IKKβ的激活,启动NF-κB信号和细胞因子上调.
- 在氧化应激期间,NEMO被招募到天体细胞中的线粒体中,这表明神经炎症作用.
结论:
- 损坏的线粒体作为平台,通过NEMO招募启动先天免疫信号.
- 在受损的线粒体上形成激活的IKK复合体,足以触发NF-κB信号.
- 线粒体和NF-κB信号传递被认为是线粒体压力激活的并行通路.
- 这种途径可能会导致神经炎症,以应对线粒体功能障碍.
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