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结核菌抗原85B修改了BCG诱导的抗结核免疫力,有利于病原体的生存

Giovanni Piccaro¹, Gabriella Aquino², Vincenzo Gigantino²

¹Department of Infectious Diseases, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy.

Journal of leukocyte biology

|January 19, 2024

概括

结核菌利用Ag85B蛋白来削弱免疫反应,导致更严重的感染. 这种免疫规避策略阻碍了身体控制结核病进展的能力.

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:

结核病 (TB) 仍然是一个主要的全球健康威胁,由Mycobacterium tuberculosis引起.
结核菌菌具有逃避和操纵宿主免疫力以求生存的机制.
Ag85B是Mycobacterium tuberculosis的一个关键分泌抗原,以其免疫性而闻名.

研究的目的:

调查Mycobacterium结核病是否使用免疫原蛋白Ag85B来操纵宿主对结核病的免疫力.
为了确定Ag85B给药对接种Bacillus Calmette-Guérin (BCG) 疫苗的小鼠的影响,这些小鼠受到Mycobacterium tuberculosis的挑战.

主要方法:

将Ag85B蛋白给BCG疫苗接种的小鼠.
挑战与Mycobacterium结核病病毒感染的小鼠.
免疫细胞反应的分析,包括CD4 T细胞激活,细胞因子生产 (IFN-γ,CCL-4,IL-22,IL-10),调节性T细胞 (Tregs) 和免疫疲劳标记 (PD-L1).
评估细胞内Mycobacterium结核病的生长控制.

主要成果:

服用Ag85B降低了BCG诱导的保护,导致更严重的感染.
Ag85B降低了BCG诱导的CD4T细胞激活和关键的促炎细胞因子的产生.
Ag85B促进了Ag85B特定的T细胞反应,调节性T细胞和免疫疲劳途径.
观察到细胞内Mycobacterium结核病菌生长的控制受损.
结核菌菌感染诱导了无效的Ag85B反应性免疫细胞.

结论:

结核菌活跃利用Ag85B的免疫性,促进其生存和传播.
Ag85B对宿主免疫的操纵有助于结核病原和免疫逃避.
了解这些机制对于制定有效的结核病控制策略至关重要.

关键词:

在BCG中,BCG是BCG.CD4 T 细胞是 CD4 的 T 细胞.在IFN-γ中使用IFN.抗原85BB是一种抗原.细胞内M.结核杀死结核病.结核病是一种肺结核病.

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