辅助BcfA通过TLR4激活抗原呈现细胞,并支持TFH和TH1,同时减弱TH2基因编程
Mohamed M Shamseldin1,2,3, Kaitlin A Read1, Jesse M Hall1
1Departments of Microbial Infection and Immunity, The Ohio State University, Columbus, OH, United States.
Frontiers in immunology
|September 13, 2024
概括
边境菌殖民因子A (BcfA) 通过激活免疫细胞上的托尔类受体4 (TLR4) 作为辅助剂. 这种机制增强TH1/TH17反应,同时抑制TH2免疫力,改善抗原呈现.
科学领域:
- 免疫学 免疫学 免疫学
- 疫苗学 疫苗学 疫苗学
- 微生物的病原发生.
背景情况:
- 辅助剂通过刺激免疫反应来增强疫苗的疗效.
- 天生的免疫细胞上的模式识别受体 (PRR) 是辅助作用的关键点.
- 边缘菌殖民因子A (BcfA) 是一种具有辅助性质的外膜蛋白,促进TH1/TH17极化.
研究的目的:
- 阐明BcfA调解TH1/TH17与TH2免疫激活的机制.
- 确定BcfA.使用的特定PRRs.
- 评估TLR4在BcfA诱导的免疫细胞激活中的作用.
主要方法:
- 对PRR进行选,以确定BCFA的激活途径.
- 使用托尔样受体4淘汰赛 (TLR4 KO) 鼠标来评估BcfA对树突细胞 (BMDC) 和抗原呈现的影响.
- 在人类外周血液单核细胞 (PBMC) 和小鼠肺部实验物中测试BcfA活性.
- 采用一个体外TH细胞极化系统.
主要成果:
- 在野生型BMDC中,BcfA通过小鼠TLR4激活抗原呈现细胞 (APC),从而对辅助刺激分子 (CD40,CD80,CD86) 和细胞因子产生 (IL-6,IL-12/23 p40,TNF-α) 的上调调节,但在TLR4 KO BMDC中并非如此.
- 人类PBMCs的BcfA刺激导致IL-6的产生.
- 在小鼠肺部中,BCfA增强了BMDCs和激活的APCs的抗原吸收 (DQ-OVA).
- 来自BcfA刺激的BMDC的超级药物促进了TFH和TH1细胞的两极分化,同时抑制了TH2编程.
结论:
- 通过通过TLR4.4激活免疫细胞,BCfA作为辅助剂起作用.
- 这种TLR4介导的激活驱动TH1/TH17免疫反应,并增强抗原呈现.
- BcfA代表了一种新的辅助剂策略,在疫苗开发中具有潜在的应用,特别是对于TH1/TH17偏差免疫.
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