Fusobacterium nucleatum在人类中性粒细胞中引起了特定亚种的反应
Maria Muchova1, Sarah A Kuehne2, Melissa M Grant1,3,4
1Periodontal Research Group, Birmingham School of Dentistry, Institute of Clinical Sciences, The University of Birmingham, Birmingham, United Kingdom.
Frontiers in cellular and infection microbiology
|October 25, 2024
概括
Fusobacterium nucleatum亚种在人类中性粒细胞中表现出明显的免疫反应. 生物膜培养的细菌和特定的亚种,如多态生物,显著改变反应性氧物种和中性粒细胞外细胞陷释放,影响疾病的发展.
科学领域:
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
- 口腔生物学 口腔生物学
背景情况:
- Fusobacterium nucleatum是一种在口腔生物膜中至关重要的,与牙周和结直肠癌相关的グラム阴性无氧生物.
- 现存的5个亚种 (animalis, fusiforme, nucleatum, polymorphum, vincentii) 与中性粒细胞发生相互作用.
- 之前的研究表明亚种特异性免疫性在细胞系中,但不是人类中性粒细胞或对不同的生长形式 (浮游生物与生物膜) 的反应.
研究的目的:
- 在人类中性粒细胞中比较浮游生物和生物膜培养的F. nucleatum的免疫性.
- 为了研究人类中性粒细胞反应的亚种特异性差异.
- 分析反应性氧物种 (ROS) 的产生,中性粒细胞细胞外陷 (NET) 的形成,以及细胞因子/酶的释放.
主要方法:
- 人类中性粒细胞被隔离并用浮游生物和生物膜培养的F. nucleatum亚种刺激.
- 使用光和光分析量化了ROS生成和NET形成.
- 通过ELISA测量了细胞因子 (IL-1β,TNF-α,IL-6,IL-8) 和酶 (中性粒细胞弹性酶,MMP-9) 的分泌.
主要成果:
- 与浮游生物形式相比,生物膜培养的F. nucleatum诱导了显著更高的ROS反应 (总和细胞内) 和更快的ROS释放.
- 生物膜培养的F. nucleatum导致IL-1β释放显著降低.
- 在ROS和细胞外超氧化物产生方面观察到显著的亚种特异性差异.
- 亚种多态刺激了最高的NET释放.
- 细胞因子的释放在亚种之间有显著的差异,但 lysosomal酶的释放没有.
结论:
- 人类中性粒细胞中F. nucleatum的免疫性在体外具有高度亚种特异性,特别是在ROS释放和细胞因子产生方面.
- 中性粒细胞对各种F. nucleatum亚种和生长形式的反应差异突显了宿主-病原体相互作用的复杂性.
- 了解这些亚种特异性免疫相互作用可能会导致F. nucleatum相关疾病的新型治疗点.
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