结核菌在缺氧下产生D-胺,以限制小鼠的CD8+ T细胞依赖免疫力
Hongyu Cheng1,2, Zhe Ji1,2, Yang Wang2
1Shanghai Key Laboratory of Tuberculosis, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, P. R. China.
Nature microbiology
|May 28, 2024
概括
结核菌 (Mtb) 在缺氧下产生D-,以逃避免疫反应. 这种代谢物抑制CD8+T细胞的干扰素- (IFN-γ) 生产,削弱了适应性抗结核免疫力.
科学领域:
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
- 代谢途径 代谢途径
背景情况:
- 缺氧在体内对Mycobacterium结核病 (Mtb) 构成生存挑战.
- 产生干扰素 (IFN) 的CD8+T细胞通过激活巨细胞对控制Mtb感染至关重要.
- 对于MTB抵消宿主免疫反应的策略,特别是在低氧状态下,尚不完全理解.
研究的目的:
- 为了调查Mtb是否在低氧条件下使用机制来逃避CD8+T细胞介导免疫力.
- 阐明Mtb的代谢适应在病原体生存和宿主免疫抑制中的作用.
主要方法:
- 使用了代谢,蛋白质和遗传分析.
- 在低氧条件下研究了Mtb在低氧条件下产生的D-氨酸.
- 评估了D-氨酸对CD8+T细胞功能和巨细胞抗菌活性的影响.
- 研究了D-胺对T细胞抑制作用的分子机制.
主要成果:
- Mtb诱导Rv0884c (SerC) 产生D-氨酸,从而增加小鼠的病变发生.
- D-氨酸抑制了CD8+T细胞的IFN-γ产生,间接损害了巨细胞对Mtb.的控制.
- 通过与WDR24相互作用和抑制mTORC1,D-氨酸抑制T细胞激活,导致T-bet表达和IFN-γ输出减少.
结论:
- Mtb利用代谢适应低氧,产生D-氨酸作为一种逃避策略.
- 由病原体衍生的D-氨酸通过抑制CD8+T细胞反应来抑制适应性抗结核免疫力.
- 这突显了一种新的病原体与宿主免疫相互作用机制,涉及氨基酸介导的免疫抑制.
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