Ipr1基因调解了对结核病的天生的免疫力
Hui Pan1, Bo-Shiun Yan, Mauricio Rojas
1Department of Immunology and Infectious Diseases, Harvard School of Public Health, 667 Huntington Avenue, Boston, Massachusetts 02115, USA.
Nature
|April 9, 2005
概括
一个新发现的基因,细胞内病原体抗性1 (Ipr1),增强了宿主对结核病的抗性. 它在巨细胞中的表达限制了病原体的繁殖,并促进了亡,为对结核菌的天生的免疫提供了新的见解.
科学领域:
- 遗传学 是一个遗传学.
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
背景情况:
- 结核病 (TB) 影响全球数以百万计的人,但只有一小部分感染者会患上这种疾病,这表明宿主遗传因素会影响易感性.
- 主体对Mycobacterium结核病耐药性的遗传基础在很大程度上仍然没有被描述.
- 在小鼠染色体1上先前发现的基因位点sst1与对结核病的超敏感性有关.
研究的目的:
- 调查stst1位点在调解对结核病的天生的免疫力中的作用.
- 为了确定负责宿主抵抗的sst1位点内的候选基因.
- 阐明已识别的基因在宿主防御机制中的功能.
主要方法:
- 在sst1位点不同的先天性小鼠菌株被用于研究先天性免疫力.
- 对敏感和耐药小鼠菌株的巨细胞进行了基因表达分析.
- 功能性研究涉及在敏感的巨细胞中表达候选基因转基因,以评估其对病原体生长和细胞死亡的影响.
主要成果:
- 在小鼠模型中,sst1位点被证明可以调解先天免疫力.
- 一个候选基因,细胞内病原体抗性1 (Ipr1),在st1位点内被确定.
- 在抗性巨细胞中检测到Ipr1表达,但在敏感的巨细胞中没有.
- 在敏感的巨细胞中Ipr1的表达限制了Mycobacterium tuberculosis和Listeria monocytogenes的复制.
- Ipr1的表达转移了受感染的巨细胞死亡从亡到亡.
结论:
- Ipr1基因在天生的免疫力和对细胞内细菌病原体的宿主耐药性中发挥着关键作用.
- Ipr1可以将病原体衍生的信号与先天性免疫反应集成在一起,包括细胞死亡途径.
- 了解Ipr1的功能可能会揭示结核病等传染病的新型治疗点.
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