内中性粒细胞通过减少病原体在沙门氏菌肠道感染期间对肠道上皮细胞的攻击来限制上皮损伤
Ersin Gül1, Ursina Enz1, Luca Maurer1
1Institute of Microbiology, Department of Biology, ETH Zurich, Zurich, Switzerland.
PLoS pathogens
|June 29, 2023
概括
内中性粒细胞在炎症期间保护肠道上皮细胞免受沙门氏菌感染,尤其是在抗生素破坏微生物群后. 它们的枯竭使上皮损伤恶化,允许持续的病原体攻击.
科学领域:
- 免疫学 免疫学 免疫学
- 胃肠病学 胃肠病学
- 微生物学 微生物学
背景情况:
- 中性粒细胞对肠道粘膜的招募是肠道感染引起的肠道炎症的关键.
- 沙门氏菌Typhimurium (S.Tm) 侵袭触发了中性粒细胞的涌入,暂时减少了病原体负载,但允许病原体再生和肠病变.
研究的目的:
- 调查内中性粒细胞在防御肠道病原体中的作用及其对沙门氏菌大肠炎期间上皮质损伤的影响.
- 阐明中性粒细胞在病原体防御和上皮质完整性维护中的功能.
主要方法:
- 在沙门氏菌大肠炎的各种小鼠模型中使用抗Ly6G抗体进行中性粒细胞减少.
- 感染野生类型的S.Tm, ssaV突变,并接受 gentamicin 治疗以消除光线病原体.
- 在用抗生素预处理,无细菌和 gnotobiotic 的小鼠进行实验.
主要成果:
- 中性粒细胞枯竭在接受过抗生素预处理的小鼠中加剧了上皮损伤,这与病原体消除受损和减少光线STM的物理阻塞有关.
- 中性粒细胞保护肠表皮的光表面,得到了感染控制和病原体消除研究的支持.
- 微生物群改善肠道病变,其保护作用由内中性粒细胞增强.
结论:
- 在沙门氏菌引起的急性肠道炎症期间,特别是微生物群破坏后,内中性粒细胞对于维持上皮质屏障完整性至关重要.
- 中性粒细胞在关键感染窗口期间限制了病原体对表皮的持续攻击.
- 微生物群对肠道病变的保护作用是由内中性粒细胞增强的.
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