肠道中的血细胞树突细胞在恒常状态中优先产生干扰素兰巴,有助于增强局部天生的免疫反应
bioRxiv : the preprint server for biology
|September 5, 2025
概括
血细胞树突细胞 (pDC) 是健康肠道中III型干扰素 (IFN-λ) 的关键生产者,它们支持免疫平衡. 组织细胞因子TGF-β影响pDC功能,影响IFN-λ的产生和免疫反应.
科学领域:
- 免疫学
- 微生物学
- 细胞生物学
背景情况:
- 肠道免疫系统依赖细胞因子信号传递,包括干扰素,以维持平衡并对微生物群做出反应.
- 第三类干扰素 (IFN-λ) 通过诱导干扰素刺激基因 (ISG) 在肠上皮形成局部抗病毒保护.
研究的目的:
- 确定肠表皮中的恒常IFN-λ的主要来源.
- 研究血细胞树突细胞 (pDC) 在肠道IFN-λ产生和ISG表达中的作用.
- 探索pDC功能的特定组织差异以及TGF-β等细胞因子的影响.
主要方法:
- 在小鼠模型中消耗肠道微生物群和pDCs.
- 使用缺少IFN-λ的pDC进行骨髓复制实验.
- 肠道与脏pDC中的基因表达和基因组可访问性的比较分析.
- 在体外刺激测定与分离的pDC和人类pDC细胞系,包括TGF-β预处理.
主要成果:
- 皮质相关的pDC是肠道内恒常IFN-λ的主要来源.
- 肠道pDCs优先产生IFN-λ,而脏pDCs则倾向于I型IFN.
- 微生物群的减少减少了pDC的丰度和ISG的表达.
- 在肠道环境中的TGF-β增强了pDCs的IFN-λ产生.
结论:
- 通过IFN-λ的产生,pDC对维持肠道免疫平衡至关重要.
- 组织特异性细胞因子,如TGF-β,重新编程pDCs以产生特定的干扰素类型.
- 了解pDC功能和细胞因子调节对于平衡免疫和屏障部位的炎症至关重要.
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