新的线粒体DNA合成能够激活NLRP3炎症体
Zhenyu Zhong1,2, Shuang Liang3,4, Elsa Sanchez-Lopez1,2
1Laboratory of Gene Regulation and Signal Transduction, Department of Pharmacology, School of Medicine, University of California San Diego, La Jolla, CA, USA.
Nature
|July 27, 2018
概括
在慢性炎症疾病中,由CMPK2调节的线粒体DNA (mtDNA) 合成对NLRP3炎症酶激活至关重要. 这一发现为控制炎症提供了新的治疗点.
科学领域:
- 免疫学
- 分子生物学
- 细胞生物学
背景情况:
- 失调的NLRP3炎症酶活动导致慢性炎症和疾病.
- 已知线粒体损伤对于NLRP3炎症酶的激活是必要的.
- 巨细胞感知各种NLRP3激活剂的确切机制尚不清楚.
研究的目的:
- 阐明线粒体DNA (mtDNA) 合成在NLRP3炎症酶激活中的作用.
- 确定连接托尔类受体 (TLR) 与NLRP3信号的分子通路.
- 探索针对NLRP3炎症相关疾病的潜在治疗策略.
主要方法:
- 研究了托尔类受体 (TLR) 和它们的适配器 (MyD88,TRIF) 在启动NLRP3信号传递中的作用.
- 分析了依赖IRF1的CMPK2转录及其对脱氧核酸合成的影响.
- 研究了CMPK2依赖mtDNA合成产生氧化mtDNA片段的必要性.
- 评估了细胞质氧化mtDNA与NLRP3炎症组合的相关性.
主要成果:
- 通过依赖IRF1的CMPK2转录诱导线粒体DNA (mtDNA) 合成.
- 在NLRP3激活时产生氧化mtDNA片段的关键是CMPK2依赖的mtDNA合成.
- 细胞质氧化mtDNA片段直接与NLRP3炎症酶激活相关,并且对NLRP3炎症酶激活有必要.
- CMPK2的催化活性被确定为NLRP3炎症体信号的关键调节点.
结论:
- 由CMPK2主导的线粒体DNA合成是NLRP3炎症酶激活的关键上游事件.
- 氧化mtDNA片段作为关键信号,将TLR参与与炎细胞组合联系起来.
- 向CMPK2活性为治疗NLRP3炎症酶驱动的慢性炎症病提供了有前途的治疗途径.
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