与狼相关的先天受体驱动自反应性B细胞的卵泡外进化
Danni Yi-Dan Zhu1,2,3, Daniel P Maurer2,3,4, Carlos Castrillon5
1Program in Cellular and Molecular Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA.
bioRxiv : the preprint server for biology
|January 23, 2024
概括
系统性红斑狼涉及通过额外卵泡 (EF) 途径发展的自身反应性B细胞. CD21lo细胞被确定为EF自身抗体分泌细胞 (ASC) 的前体,TLR7信号对它们的发展至关重要.
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:
- 最近的研究确定了卵泡外 (EF) 途径是系统性红斑狼 (SLE) 中自抗体分泌细胞 (ASC) 的关键来源.
- CD21低CD11c+ B细胞与自身反应性EF ASC产生有关,但它们的发育起源尚不清楚.
- 了解自身反应性B细胞发育的动力学和调节对于SLE的发病过程至关重要.
研究的目的:
- 在体内研究EF途径内的自反应性B细胞的发育轨迹和动力学.
- 阐明托尔类受体7 (TLR7) 在自反应性B细胞激活和分化的早期阶段信号传递中的作用.
- 确定潜在的治疗点,以抑制SLE中自反应性B细胞反应.
主要方法:
- 将野生型 (WT) 和基因淘汰B细胞种群通过收养转移到564Igi自反应性宿主小鼠中.
- 时间标记分析以追踪B细胞种群并评估耐受性逃逸和ASC前编程.
- 阻断实验调查CD21在B细胞分化和效应细胞生成中的功能.
- 库存分析研究B细胞受体的演变和自我反应.
主要成果:
- 对于外围B细胞耐受性早期脱离和启动ASC分裂前程序来说,TLR7信号传递至关重要.
- CD21低B细胞表现出较高的TLR7敏感性和繁殖能力,支持它们作为EF ASCs前体的作用.
- 抑制CD21功能逆转了CD21损失,减少了效应细胞的产生,并突出了CD21在启动分化中的作用.
- 剧本分析揭示了选择过程,有利于原始自动反应性B细胞和受体进化向自我反应性.
结论:
- CD21低B细胞作为额外毛囊自身抗体分泌细胞的前体,由TLR7信号驱动.
- CD21在自身反应性B细胞发育过程中起到关键的分化启动作用,并具有潜在的治疗标.
- 这项研究建立了一个模型系统,用于剖析自身反应性B细胞发育和受体进化背后的机制.
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