破坏的巨细胞自作为细胞死亡的驱动因素和系统性炎症中LPS诱导的致命休克
Tarek Chekroune1,2, Sandra Carignon1, Meriem Taleb1
1Immuno NEuro Modulation (INEM), UMR 7355 CNRS, Orléans, France.
Frontiers in immunology
|November 10, 2025
概括
髓状细胞的自缺乏会在炎症期间加剧致命的冲击和组织损伤. 这些细胞的自功能受损促进了亲炎性巨细胞表型和多种细胞死亡途径,恶化了系统性炎症反应综合征 (SIRS).
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 病理生理学 病理生理学
背景情况:
- 系统性炎症反应综合征 (SIRS) 涉及不平衡的炎症反应,可能导致器官衰竭.
- 巨细胞和自细胞在SIRS病原发生中的作用越来越被认可,但尚未完全定义.
- 导致严重SIRS的核心分子事件仍然不太清楚.
研究的目的:
- 为了研究在脂多糖 (LPS) 诱导的SIRS期间,髓状细胞中自的作用.
- 阐明骨髓细胞中自性缺陷如何影响巨细胞表型,铁代谢和细胞死亡.
- 了解受损骨髓细胞自对组织损伤和生存的后果.
主要方法:
- 使用了具有特异性髓状细胞 (Atg5f/fLysM-cre+) 自性缺陷的小鼠.
- 服用不同剂量的LPS来诱导SIRS,并评估死亡率和组织损伤.
- 采用流细胞计,免疫光和RNA测序来分析巨细胞表型和细胞变化.
- 检查了铁的积累,反应性氧物种的水平,以及不同的细胞死亡途径 (铁亡,亡,热亡).
主要成果:
- 自缺乏的髓状细胞导致LPS诱导的致命休克高死亡率.
- 低剂量的LPS在缺陷小鼠中引发了快速的肝脏和脏损伤,其特征是巨细胞形态变化和铁损失.
- 肝细胞积累了铁,增加了活性氧物种,而肝脏表现出铁和亡.
- 在脏和肝脏发生了广泛的热,同时出现了明显的亲炎性巨细胞表型.
结论:
- 在LPS诱导的炎症期间,自对髓状细胞功能至关重要.
- 骨髓细胞自的缺陷会破坏铁的稳态,并促进严重的组织损伤.
- 损伤的自会通过驱动促炎性巨细胞反应和多种形式的细胞死亡来加剧SIRS.
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