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异位性卡斯帕斯抑制mtDNA诱导的STING介导的I型IFN生产
Michael J White1, Kate McArthur1, Donald Metcalf2
1ACRF Chemical Biology Division, The Walter and Eliza Hall Institute of Medical Research, Parkville 3052, Australia; Department of Medical Biology, The University of Melbourne, Parkville 3010, Australia.
Cell
|December 20, 2014
概括
激活的卡斯帕斯能在亡过程中阻止免疫反应. 酶活性抑制了线粒体DNA的释放,阻止了干扰素的产生,并保护了干细胞.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 激活的体是内在亡的关键,但在体内细胞死亡中并不必不可少.
- 死亡的细胞可以触发免疫反应,这表明caspases可能具有免疫调节作用.
研究的目的:
- 研究卡斯帕斯级联在抑制Bak/Bax介导的亡期间免疫反应中的作用.
- 为了确定caspases是否阻止死亡细胞产生I型干扰素.
主要方法:
- 使用药理学caspase抑制和caspase通路组件的遗传删除 (caspase-9,Apaf-1,caspase-3/7).
- 评估了线粒体DNA释放和cGAS/STING依赖的DNA传感通路的激活.
- 测量了干扰素β (IFN-β) 在体外和体内生产.
- 在存在Bak/Bax介导的亡时评估了造血干细胞功能.
主要成果:
- 酶级联抑制了在经历Bak/Bax介导的亡的细胞中I型干扰素的产生.
- 卡斯巴酶的抑制或删除导致死亡细胞的IFN-β分泌.
- 在体内,这种IFN-β升高会导致造血干细胞功能障碍.
- 失去巴克和巴克斯可以纠正干细胞功能障碍.
结论:
- 代性酶级联使线粒体代免疫学上变得无声.
- 酶活性对于防止由垂死的细胞启动的炎症反应至关重要.
- 这种机制保护重要的细胞群,如造血干细胞,免受免疫媒介损伤.
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