CpG-A诱导HMGB1的液-液相分离,以激活RAGE介导的炎症途径
Kaihui Peng1, Gaohong Fu1, Long Chen1
1State Key Laboratory of Green Biomanufacturing, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China.
概括
高流动性组盒子蛋白1 (HMGB1) 与细菌DNA相互作用,触发液体-液体相分离 (LLPS). 这个过程激活了免疫信号通路,在微生物感染反应期间释放炎症性细胞因子.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 高流动性组盒蛋白1 (HMGB1) 作为细胞外媒体,诱导免疫和炎症反应.
- 微生物感染会触发HMGB1的释放,从而启动炎症级联.
研究的目的:
- 研究HMGB1与细菌DNA模拟物CpG-A.A.之间的相互作用.
- 阐明液-液相分离 (LLPS) 在HMGB1介导的免疫信号传递中的作用.
- 了解HMGB1-CpG-A复合体形成对RAGE和SLP76信号的下游影响.
主要方法:
- 使用体外试验分析研究了HMGB1和CpG-A之间的直接相互作用.
- 观察到HMGB1-CpG-A复合体形成和随后的LLPS.
- 分析了RAGE,SLP76和MAPK途径对复合物的反应的激活.
- 在信号通路激活后检查的细胞因子释放.
主要成果:
- HMGB1直接与CpG-A相互作用,通过其DNA结合域诱导LLPS.
- 该HMGB1-CpG-A复合体刺激RAGE,导致SLP76相分离.
- 观察到MAPK通路的激活和随后的炎症性细胞因子的释放.
- 细胞内SLP76在受体激活时与RAGE细胞醇域形成凝结物.
结论:
- 在DNA-HMGB1-RAGE-SLP76信号轴中,LLPS是一种功能增益机制.
- HMGB1的活动由LLPS调节,影响免疫细胞对微生物感染的反应.
- 细胞内凝聚物的形成代表了炎症细胞膜受体激活中的一般下游事件.
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