通过CD86通过B细胞介导的CD4T细胞共刺激会在自身免疫性肠炎期间加剧促炎性细胞因子的产生
Iana Gadjalova1, Julia M Heinze1, Marie C Goess1
1Institute for Clinical Chemistry and Pathobiochemistry, Technical University of Munich, School of Medicine, Munich, Germany; TranslaTUM, Center for Translational Cancer Research, Technical University Munich, Munich, Germany.
激活的B细胞,特别是CD86表达,通过增加T细胞细胞因子的产生,使炎症性肠病 (IBD) 恶化. 针对B细胞或CD86信号的疗法在IBD模型中减少了肠道炎症.
科学领域:
- 免疫学 免疫学 免疫学
- 胃肠病学 胃肠病学
- 细胞生物学 细胞生物学
背景情况:
- B细胞反应与炎症性肠病 (IBD) 有关,但它们的确切作用尚不清楚.
- 激活的B细胞可能导致自身免疫性肠道炎症.
研究的目的:
- 研究激活B细胞在自身免疫性肠道炎症发作中的有害作用.
- 确定B细胞加剧IBD病理的特定分子机制.
主要方法:
- 用维斯科特-阿尔德里奇综合征相互作用蛋白缺乏 (Wipf1-/-) 小鼠作为慢性结肠炎的模型.
- 评估了CD86在激活的B细胞上的表达及其对CD4 T细胞细胞因子产生的影响.
- 采用抗CD20抗体治疗和CTLA-4-Ig来分别消耗B细胞和阻止CD86信号传递.
- 分析了来自小鼠模型和人类IBD患者的B细胞和血清.
主要成果:
- 活性B细胞上的CD86表达被确定为加剧肠道CD4T细胞的促炎细胞因子产生的关键因素.
- 在Wipf1-/-小鼠模型中,B细胞枯竭和CD86阻断显著降低了肠道炎症.
- 这些治疗降低了异常的幽默免疫反应和CD4 T细胞的促炎性细胞因子 (IFN-γ,GM-CSF) 生产.
- 在Wipf1-/-小鼠和具有炎症组织的人类IBD患者中观察到活性B细胞上升调的CD86表达.
- 溶性CD40L在体外促进了B细胞激活和CD86表达,并在IBD患者和小鼠的血清中发现.
结论:
- 激活的B细胞在自身免疫性肠道炎症的开始和恶化中起着有害的作用.
- 激活的B细胞上的CD86是一个关键的调解者,在IBD中驱动了促炎性CD4T细胞反应.
- 向B细胞或CD86介导的共刺激信号代表了IBD治疗的潜在治疗策略.
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