一种高病毒性结核病菌株的甘油脂,可以抑制天生的免疫反应
Michael B Reed1, Pilar Domenech, Claudia Manca
1Tuberculosis Research Section, NIAID, National Institutes of Health, 12441 Parklawn Drive, Rockville, Maryland 20852, USA.
Nature
|September 3, 2004
概括
结核菌菌的性糖脂 (PGL) 导致小鼠的高死亡率. 破坏PGL合成会减少毒性,而PGL会抑制免疫细胞释放的促炎细胞因子.
科学领域:
- 结核病的研究研究.
- 免疫学 免疫学 免疫学
- 微生物的病原发生.
背景情况:
- 结核病 (TB) 仍然是全球主要的健康威胁,每年造成数百万人的死亡.
- 尽管基因相似,但Mycobacterium结核菌株表现出不同的临床结果.
- 由细菌因素改变宿主免疫反应是结核病原的关键.
研究的目的:
- 在高病毒性M.结核菌株中识别和表征一种生物活性脂类物种.
- 研究这种脂质在疾病发病和宿主免疫反应中的作用.
主要方法:
- 在W-Beijing的M.结核病分离物中识别了聚基酸合成酶衍生的性甘油脂 (PGL).
- 在M.结核病中对PGL合成的遗传破坏.
- 鼠类感染模型用于评估细菌负载和高致命性.
- 使用单细胞衍生的巨细胞测量细胞因子释放的体外研究.
主要成果:
- 结核菌 (W-北京家族) 的一个子组产生与PGL相关的高病毒性表型.
- 在未改变细菌负载的情况下,中断PGL合成在小鼠模型中取消了超致命性.
- PGL的损失与促进炎症性细胞因子 (TNF-α,IL-6,IL-12) 的释放增加相关.
- PGL以剂量依赖的方式抑制了巨细胞从巨细胞中释放的促炎性细胞因子.
结论:
- 性甘油脂 (PGL) 是超致命的Mycobacterium结核菌株的关键毒性因子.
- PGL通过抑制促炎性细胞因子的产生来调节宿主免疫反应.
- 准PGL合成或功能可能为结核病治疗提供新的策略.
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