来自Mycobacterium tuberculosis的林诺酸增加了调节性T细胞功能,以促进巨细胞内的细菌存活
Hongyu Cheng1,2, Shenzhi Li1,2, Hongjie Liu1
1Shanghai Key Laboratory of Tuberculosis, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, People's Republic of China.
Nature microbiology
|October 10, 2025
概括
结核菌使用一种代谢物 - - 酸来增加调节性T细胞 (Treg) 并逃避免疫反应. 这一过程涉及Rv1272c,促进巨细胞内的Mtb生存.
科学领域:
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
- 分子生物学分子生物学
背景情况:
- 调节性T (Treg) 细胞对于在Mycobacterium tuberculosis (Mtb) 感染期间的免疫抑制至关重要.
- 通过Mtb操纵Treg细胞扩张和功能的精确机制仍然不完全理解.
研究的目的:
- 调查Mtb是否在感染期间积极促进Treg细胞扩张.
- 阐明Mtb通过宿主免疫细胞操纵促进其生存的分子机制.
主要方法:
- 利用Mtb的全基因组突变库来选影响宿主-病原体相互作用的基因.
- 采用分析代谢物生产,免疫检查点分子贩运和宿主细胞中信号通路的技术.
- 在各种条件下研究了巨细胞内的Mtb存活率.
主要成果:
- Mtb Rv1272c,一种ATP结合的磁带载体,在缺氧下升调,并通过增加莱素进口和酸生产来促进Mtb的生存.
- 由Mtb感染的巨细胞释放的林诺酸增强了细胞毒性T淋巴细胞抗原4 (CTLA-4) 在Treg细胞上的表面表达,通过Ca2+载体ATP2a3.3.
- 这种由Mtb诱导的Treg细胞激活抑制了巨细胞的活性氧物种的产生,并促进了Mtb细胞内生存和免疫逃避.
结论:
- Mtb通过产生像氨酸这样的代谢物来积极操纵宿主免疫反应.
- Rv1272c-氨酸-ATP2a3-CTLA-4轴代表了Mtb免疫逃避和细胞内持久性的新机制.
- 这些发现凸显了Mtb利用宿主代谢途径以实现自身生存的能力.
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