脏线粒体DNA在败血症相关的急性损伤中,有助于系统性IL-6释放
Avnee J Kumar1,2, Katharine Epler1,2, Jing Wang3
1VA San Diego Healthcare System, San Diego, California, USA.
JCI insight
|December 8, 2025
概括
在败血症相关的急性损伤 (AKI) 期间释放的线粒体DNA (mtDNA) 通过托尔类受体9 (TLR9) 促进了互白素-6 (IL-6) 释放. 向脏mtDNA可能会降低败血症死亡率.
科学领域:
- 免疫学 免疫学 免疫学
- 腎臟病學 (nephrology) 是一種醫學.
- 线粒体生物学 线粒体生物学
背景情况:
- 线粒体功能障碍是急性损伤 (AKI) 的关键机制.
- 循环中高水平的IN-6 (IL-6) 与败血症死亡率和全身炎症相关.
- 脏线粒体DNA (mtDNA) 在与败血症相关的AKI和IL-6释放中的作用尚不清楚.
研究的目的:
- 调查脏mtDNA是否有助于在败血症相关的AKI中释放IL-6.
- 确定托尔类受体9 (TLR9) 在这个过程中的参与.
- 探索与败血症相关的AKI的潜在治疗点.
主要方法:
- 通过结和穿孔 (CLP) 诱导的败血症的小鼠模型.
- 下一代测序和滴滴数字PCR用于血mtDNA量化和SNP分析.
- 用树突细胞进行体外研究和用脏线粒体溶液进行体内实验.
- 在有或没有AKI的败血症患者中,给予TLR9抑制剂并分析血mtDNA和IL-6.
主要成果:
- 在小鼠的CLP后,血mtDNA度显著升高.
- mtDNA单核酸多态 (SNP) 表示脏来源.
- 脏mtDNA在体外刺激了树突细胞的IL-6释放,并在体内增加了IL-6.
- 抑制TLR9减轻了IL-6的释放.
- 与没有AKI的患者相比,患有AKI的败血症患者的血mtDNA和IL-6水平较高.
结论:
- 通过mtDNA释放,AKI有助于通过mtDNA释放在败血症中增加循环IL-6.
- 脏mtDNA通过TLR9.9激活IL-6的释放.
- 向脏线粒体和mtDNA释放是一个潜在的治疗策略,以减少与败血症相关的AKI死亡率.
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