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单细胞衍生的肺细胞的IFNγ反应受损限制了对Mycobacterium结核病的免疫力

Weihao Zheng¹, Jason D Limberis¹, Zachary P Howard¹

¹Division of Experimental Medicine, Department of Medicine, University of California, San Francisco, California, USA.

bioRxiv : the preprint server for biology

|November 24, 2025

概括

结核菌菌 (Mtb) 通过利用免疫细胞对干扰素- (IFNγ) 的反应方式的差异,在肺部持续存在. 加强这种反应可以改善结核病治疗和疫苗.

科学领域:

免疫学免疫学免疫学
微生物学微生物学
传染性疾病传染性疾病

背景情况:

肺单核细胞 (MNP) 子集在慢性感染期间表现出不同的控制Mycobacterium结核病 (Mtb) 的能力.
驱动MNP子集中的这些功能差异的确切机制仍然不完全理解.

研究的目的:

调查肺部MNP子集对干扰素- (IFNγ) 的差异反应及其对Mtb持久性的影响.
探索I型IFN信号在调节MNP反应和T细胞激活中的作用.
评估先前免疫对MNP IFNγ反应能力和对Mtb.控制的影响.

主要方法:

流细胞计和细胞内细胞因子染色以分析肺MNP子集中的IFNγ信号蛋白.
对IFNγ刺激的反应中MHC-II表达和CD4T细胞激活的评估.
在体内研究使用老鼠模型的Mtb感染和没有先前免疫.

主要成果:

低CD11c的单细胞衍生细胞 (MNC1),允许Mtb,与膜巨细胞 (AM) 和CD11c高的MNC2相比,显示IFNγ信号减少.
I型IFN信号抑制MNC1上IFNγ诱导的MHC-II表达,影响CD4 T细胞激活.
优先免疫增强了单细胞衍生细胞中的IFNγ反应能力,从而减少了Mtb负担.

结论:

结核菌利用肺部MNP子集中的异质IFNγ响应性来实现体内持久性.
针对或增强易感MNP子集的IFNγ响应,为宿主导结核病疗法提供了一个潜在的战略.
提高IFNγ反应能力可能对开发更有效的结核病疫苗至关重要.

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