大细胞的酸酶抑制mtRNA介导的干扰素的产生
Alexander Hooftman1, Christian G Peace2, Dylan G Ryan3,4,5
1School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland. ahooftma@tcd.ie.
Nature
|March 8, 2023
概括
巨细胞的新陈代谢包括阿斯巴酸-阿尔金酸分流. 抑制酸 (FH) 增加了炎症反应,突出显示了酸在巨细胞功能中的保护作用.
科学领域:
- 免疫学
- 代谢途径
- 细胞生物学
背景情况:
- 巨效应器的功能依赖于新陈代谢的重新连接,但根本的机制尚未完全理解.
- 需要进一步阐明阿斯巴酸-阿尔基尼酸突变在炎症中的作用.
研究的目的:
- 研究导致巨细胞炎症反应的代谢机制.
- 确定 fumarate hydratase (FH) 在调节巨介导炎症和细胞因子产生中的作用.
主要方法:
- 无偏见的代谢量和稳定的同位素辅助追踪以确定代谢途径.
- 刺激脂多糖体 (LPS) 诱导巨细胞的炎症反应.
- 药理上抑制和遗传性废除烟酸酸酶 (FH).
- 用于全球基因和蛋白质表达分析的RNA测序和蛋白质组学.
- 分析线粒体功能和RNA传感途径.
主要成果:
- 激发LPS会诱导一种炎症性阿斯巴酸-阿尔吉尼诺糖突变,从而增加细胞酸烟酸和蛋白质糖.
- 抑制FH会增加细胞内烟酸,抑制线粒体呼吸,并增强炎症信号.
- 抑制FH导致白蛋白-10的减少和瘤死因分泌的增加.
- 通过线粒体RNA释放的FH抑制,通过TLR7,RIG- I和MDA5激活来提高干扰素β的产生.
- 在全身性红斑狼患者的细胞中观察到FH抑制,这表明其具有致病作用.
结论:
- 通过限制过度的炎症反应,FH在巨细胞中起着保护作用.
- 抑制FH有助于炎症病理,可能包括全身性红斑狼.
- 针对FH或相关代谢途径可能为炎症性疾病提供治疗策略.
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