结核菌抑制APLP2的表达,以提高其在巨细胞中的存活率
Jianxia Chen1, Fen Tang1, Haohao Li1
1Clinical and Translational Research Center, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai 200433, China; Shanghai Key Lab of Tuberculosis, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai 200433, China.
粉样蛋白前体样蛋白2 (Aplp2) 对于控制结核病至关重要. 较低的Aplp2水平损害了巨细胞的防御能力,增加了对Mycobacterium tuberculosis (M.tb) 感染的易感性.
科学领域:
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
- 细胞生物学 细胞生物学
背景情况:
- 结核菌菌 (M.tb) 导致数百万人的死亡,并采用免疫逃避策略.
- 粉样前体样蛋白2 (Aplp2) 的作用已知,但其在结核病 (TB) 发病过程中的功能尚未探索.
研究的目的:
- 调查Aplp2在宿主防御M.tb感染中的作用.
- 阐明Aplp2影响结核病免疫反应的分子机制.
主要方法:
- 在结核病患者,感染的巨细胞和小鼠中量化Aplp2水平.
- 评估由Aplp2-缺陷巨细胞杀死M.tb的情况.
- 分析iNOS和细胞因子表达 (例如IL-1β).
- 在Aplp2突变小鼠中的敏感性评估.
- 对AICD2核转移和NF-κB通路激活的研究.
主要成果:
- 在结核病患者,感染细胞和小鼠中,Aplp2水平显著降低.
- 缺少Aplp2会影响巨细胞介导的M.tb杀死,减少iNOS和IL-1β的产生.
- Aplp2突变小鼠表现出增加的易感性,组织病理损伤和细菌负载.
- 在核中,AICD2与p65相互作用,增强NF-κB活性,并上调IL-1β和iNOS.
结论:
- 在对抗M.tb感染方面,Aplp2起着至关重要的保护作用.
- Aplp2通过氧化 (NO) 和IL-1β介导机制促进细菌清除.
- M.tb可能利用降低的Aplp2水平作为一种免疫逃避策略,呈现出潜在的治疗标.
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