失塑性肺部修复通过不适应的巨细胞两极分化促进了促进结核病的微环境
Shivraj M Yabaji1, Suruchi Lata1, Anna E Tseng1
1The National Emerging Infectious Diseases Laboratories (NEIDL), Boston University, Boston, Massachusetts, United States of America.
PLoS pathogens
|October 6, 2025
概括
免疫能力强的宿主中肺结核 (TB) 的进展是由肺组织相互作用驱动的,而不是氧气水平. 在受伤的肺细胞中异常的巨细胞活动促进了Mycobacterium结核病 (Mtb) 的生存和传播.
科学领域:
- 免疫学 免疫学 免疫学
- 病理学 病理学 病理学
- 微生物学 微生物学
背景情况:
- 肺结核 (TB) 是全球主要的健康负担,主要影响免疫能力强的成年人,并作为关键的Mtb传播途径.
- 虽然大多数Mtb感染被制,但由于制失败,一些免疫能力强的个体会发展出活跃的肺结核,导致血源性传播和气溶传播.
- 了解允许MTB生存和复制的肺特异性因素,尽管有系统免疫力,对于开发有效疗法至关重要.
研究的目的:
- 研究肺部特异性的微环境,以促进 Mycobacterium tuberculosis (Mtb) 在免疫能力强的宿主中生存和复制.
- 在易受感染的个体中阐明肺结核进展的细胞和分子机制.
- 确定结核病潜在的宿主导治疗点.
主要方法:
- 使用光复合免疫组织化学和空间转录基因分析在血液传播肺结核的小鼠模型 (B6.Sst1S小鼠) 中.
- 在免疫能力强但对结核病敏感的小鼠的肺部分析了异质性结核病变.
- 在感染前采用肺和脏碎片的皮下植入,以评估肺细胞与氧化的作用.
主要成果:
- 敏感小鼠的二次肺病变最初显示在三级淋巴卵泡内含有,不复制的细菌.
- 进展涉及骨髓细胞扩张,替代激活的巨细胞,淋巴卵泡溶解和脱差的肺上皮细胞,导致严重的肺炎.
- 皮下肺部植入物形成了mtb复制的颗粒体,反映了本地肺部的进展,并表明肺细胞组成,而不是氧气是至关重要的.
- 鉴定出异常激活的巨细胞和炎症受伤的肺部居民细胞之间的有害相互作用是Mtb易感性的关键.
结论:
- 免疫能力强的宿主中肺结核的进展是由炎症肺组织的细胞组成决定的,特别是激活的巨细胞和受伤的肺细胞之间的相互作用.
- 这些肺内在的机制,而不是氧化,驱动Mtb复制和疾病严重程度,非常类似于人类肺结核.
- 已识别的途径代表了针对结核病的宿主导疗法的有希望的目标,可能利用保存的进化机制.
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