时间单细胞分析揭示了呼吸道病毒感染后免疫解脱的年龄相关延迟
Yue Wu1,2,3,4, Chaofan Li1,2, Jinyi Tang1,2
1Beirne B. Carter Center for Immunology Research, University of Virginia; Charlottesville, VA 22908, USA.
bioRxiv : the preprint server for biology
|December 25, 2025
概括
衰老会影响病毒感染后的肺部修复. 老年小鼠显示免疫细胞反应发生变化和干扰素信号增加,导致慢性炎症. 在老老鼠中,干扰素抑制改善了肺部恢复.
科学领域:
- 免疫学 免疫学 免疫学
- 呼吸系统医学 呼吸系统医学
- 老年学是一门学科.
背景情况:
- 衰老是急性呼吸道病毒感染后严重后果和肺部不良修复的重要危险因素.
- 了解驱动年龄相关易感性的免疫机制对于开发向疗法至关重要.
研究的目的:
- 调查免疫细胞动态和分子途径,有助于病毒病原和衰老肺部的肺部修复.
- 确定潜在的治疗目标,以减轻与年龄相关的呼吸道并发症.
主要方法:
- 一项全面的时间研究,比较了感染甲型流感病毒 (IAV) 的年轻和老年小鼠.
- 利用单细胞RNA测序 (scRNAseq) 和高维流细胞测量来分析肺免疫细胞群.
- 研究了通过向抑制信号传递的I型和II型干扰素 (IFNα/γ) 的作用.
主要成果:
- 衰老的肺部在感染后表现出膜巨细胞 (AM) 和树突细胞 (DC) 的减少,但单细胞衍生的巨细胞 (MoM) 和间歇性巨细胞 (IM) 的增加.
- 在记忆阶段,在老年小鼠中观察到适应性免疫细胞 (包括TRH,TRM和与年龄相关的B细胞) 的增强积累.
- 较高的I型和II型干扰素 (IFNα/γ) 信号发送,特别是在MoM/IM子集中,特征为老年宿主.
- 在老年小鼠中,抑制IFNα/γ信号后病毒清除改善了肺部结果,并减少了IM和TRH群体.
结论:
- I型和II型干扰素 (IFNα/γ) 信号传递,特别是在MoM/IM子集内,在病毒感染后老年肺部持续适应性免疫和慢性免疫病理学中发挥着关键作用.
- 向IFNα/γ信号提供了一个潜在的治疗策略,以增强肺部修复和减少老年人群的炎症.
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