对细菌鞭毛素的先天免疫反应是由Toll-like受体5介导的
F Hayashi1, K D Smith, A Ozinsky
1Department of Immunology, University of Washington, Seattle 98195, USA.
Nature
|April 27, 2001
概括
哺乳动物托尔样受体5 (TLR5) 检测细菌鞭毛素,这是鞭毛病原体的关键组成部分. 这种识别激活了免疫信号通路,导致细胞因子的产生和对细菌感染的有效免疫力.
科学领域:
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
- 分子生物学分子生物学
背景情况:
- 天生的免疫系统识别了微生物上的病原体相关分子模式 (PAMPs).
- 收费类受体 (TLRs) 对PAMP识别和启动免疫反应至关重要.
- 细菌的鞭毛蛋白质flagellin是一种保存的PAMP,在各种物种中得到识别.
研究的目的:
- 为了确定特定的哺乳动物受体,负责鞭毛蛋白的识别.
- 为了阐明 flagellin 激活的信号通路.
- 了解这种受体在检测鞭状细菌病原体中的作用.
主要方法:
- 从Listeria monocytogenes中净化和识别TLR5刺激活性.
- 使用鞭毛蛋白突变细菌和TLR5表达细胞的功能测试.
- 在野生型和MyD88-null小鼠中分析NF-kappaB激活和细胞因子 (TNF-alpha,IL-6) 的产生.
主要成果:
- 哺乳动物的Toll-like受体5 (TLR5) 被确定为鞭毛蛋白受体.
- 弗拉盖林与TLR5结合会触发NF-kappaB的调动和瘤亡因子-α的产生.
- 依赖MyD88的信号传递对于宿主对鞭素的反应至关重要,包括IL-6的产生.
结论:
- TLR5特别识别了来自格拉姆阳性和格拉姆阴性细菌的细菌鞭毛蛋白.
- 鞭毛素诱导的TLR5激活对于启动对鞭毛细菌的先天免疫反应至关重要.
- 这种TLR5-旗蛋白相互作用代表了检测细菌病原体的进化保存机制.
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