呈现抗原的自身反应性B细胞激活调节性T细胞,并抑制小鼠自身免疫性关节炎
Mike Aoun1, Ana Coelho1, Alexander Krämer1
1Division of Medical Inflammation Research, Department of Medical Biochemistry and Biophysics, Karolinska Institute, Solna, Sweden.
The Journal of experimental medicine
|September 11, 2023
概括
自然存在的特异于II型原蛋白的自身反应性B细胞 (C1-B) 通过耐受T细胞来抑制关节炎. 这种机制涉及抗原呈现和依赖接触的调节性T细胞扩张,独立于IL10.
科学领域:
- 免疫学 免疫学 免疫学
- 这是一种自身免疫力.
- B细胞生物学B细胞生物学
背景情况:
- B细胞选择消除了自身反应的克隆,但积极选择的证据有限.
- 调控性B细胞通常通过IL10分泌来起作用.
研究的目的:
- 研究自然自身反应性B细胞 (C1-B) 在自身免疫性炎症中的作用和机制.
- 为了确定自身反应性B细胞是否可以独立于IL10抑制关节炎.
主要方法:
- 利用独特的四度体来追踪特定于II型原体 (COL2) 的C1-B细胞.
- 在小鼠模型中进行了收养转移实验.
- 进行单细胞测序以分析细胞表面标记物和基因表达.
- 通过封锁实验研究了CD72在C1-B细胞功能中的作用.
主要成果:
- 特定于COL2的C1-B细胞是多种物种B细胞谱的重要组成部分.
- 通过采用C1-B细胞的转移,可以独立于IL10抑制关节炎.
- C1-B细胞表现出抗原处理和呈现特征,表达CD72和CCR7.
- C1-B细胞以接触依赖的方式诱导调节性T细胞扩张,这种过程对CD72封锁敏感.
结论:
- 自主反应性B细胞 (C1-B) 可以通过一种新的IL10独立机制抑制自身免疫性炎症,如关节炎.
- 这些B细胞通过向T细胞呈现自身抗原来起作用,诱导调节性T细胞扩张并促进T细胞耐受.
- CD72在这种T细胞耐受性途径中发挥着关键作用,这表明了对自身免疫性疾病的新治疗点.
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