德克萨米他诱导的免疫抑制在Pneumocystis肺炎中重编程中性粒细胞代谢,并损害抗菌功能
Xiao-Xia Zhou1, Yu-Xi Chen2, Dong Wang3
1Department of Respiratory and Critical Care Medicine, Beijing Institute of Respiratory Medicine and Beijing Chao-Yang Hospital, Capital Medical University, Beijing, 100020, China; Department of General Medicine, Fu Xing Hospital, Capital Medical University, Beijing, 100038, China.
Biochemical and biophysical research communications
|November 8, 2025
概括
德克萨米他 (DEX) 通过抑制脂肪酸氧化 (FAO) 来损害在肺囊炎肺炎 (PCP) 中的中性粒细胞功能. 这种代谢重编程降低了中性粒细胞的抗菌能力,在机会性感染期间恶化了免疫抑制.
科学领域:
- 免疫学 免疫学 免疫学
- 肺部医学 肺部医学
- 代谢途径 代谢途径
背景情况:
- 德克萨米他 (DEX) 是一种强大的免疫抑制剂,与诸如肺囊性肺炎 (PCP) 等机会性感染有关.
- 通过DEX影响肺部免疫力对肺囊病毒的特定机制尚未完全理解.
研究的目的:
- 在PCP模型中阐明DEX诱导的免疫抑制期间肺部的免疫和代谢变化.
- 研究DEX对肺免疫细胞,特别是中性粒细胞的功能影响.
主要方法:
- 来自对照小鼠和DEX诱导的免疫受损小鼠 (DEX-PCP) 的肺组织的单细胞RNA测序 (scRNA-seq).
- 流细胞计,RT-qPCR,大量RNA-seq和代谢学试验用于分析细胞组成和代谢状态.
- 评估中性粒细胞的功能,包括活性氧物种 (ROS) 生产和细胞化.
主要成果:
- 由DEX诱导的免疫抑制改变了肺细胞格局,增加了中性粒细胞和单细胞,同时减少了淋巴细胞.
- 中性粒细胞表现出受损的促炎和抗菌功能,减少ROS的产生和细胞活性.
- 从DEX-PCP小鼠的中性粒细胞中观察到脂肪酸氧化 (FAO) 的显著抑制,以及关键抗菌媒介的下调调节.
结论:
- 在PCP中DEX诱导的免疫抑制通过重编程其代谢状态来损害中性粒细胞的功能.
- 脂肪酸氧化 (FAO) 的损害是DEX在PCP的背景下颠覆中性粒细胞抗菌能力的关键机制.
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