UNC93B1使用合成蛋白来抑制TLR7信号并防止自身免疫
Olivia Majer1, Bo Liu2, Lieselotte S M Kreuk1
1Division of Immunology and Pathogenesis, Department of Molecular and Cell Biology, University of California, Berkeley, CA, USA.
Nature
|September 24, 2019
概括
托尔类受体 (TLR) 护卫体UNC93B1特别限制TLR7的信号传递,防止TLR7依赖的自身免疫. 这种机制涉及UNC93B1与syntenin-1的结合,调节TLR7对外体的分类并设置其激活值.
科学领域:
- 免疫学
- 分子生物学
- 细胞生物学
背景情况:
- 像TLR7和TLR9这样的托尔类受体 (TLRs) 识别自我核酸,在系统性红斑狼等自身免疫性疾病中发挥不同的作用.
- 虽然TLR7的激活在小鼠模型中加剧了疾病,但TLR9的缺陷使其恶化,这表明了不同的调节机制.
- 区分TLR7和TLR9调节的精确分子机制,特别是负调节,在很大程度上是未知的.
研究的目的:
- 调查TLR贩运监护人UNC93B1在调节TLR7和TLR9信号中的功能.
- 阐明UNC93B1区分TLR7和TLR9的信号值的机制.
- 了解UNC93B1如何防止TLR7依赖的自身免疫.
主要方法:
- 使用小鼠模型调查了UNC93B1在TLR7和TLR9贩运和信号传递中的作用.
- 分析了UNC93B1和TLR1之间的相互作用.
- 检查了外体中UNC93B1和TLR7的存在以及它们在多细胞体分类中的作用.
主要成果:
- 与TLR9不同的是,UNC93B1特别限制了TLR7的信号传递,并防止了小鼠的TLR7驱动的自身免疫.
- 在UNC93B1中增强TLR7信号的突变会破坏其与外体生物发生的蛋白质syntenin-1的结合.
- 在外体中发现UNC93B1和TLR7,UNC93B1与syntenin-1的相互作用促进TLR7的分类到内囊,终止信号传递.
结论:
- UNC93B1作为TLR7的负调节剂,与TLR9贩运中的作用不同.
- UNC93B1与syntenin-1的酸化依赖性结合可以动态调节TLR7的激活和信号传递.
- UNC93B1不仅对人口贩运至关重要,而且对自反应性TLR7的激活值也至关重要,从而防止自身免疫.
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