脂胺结合受体,CD300f,在巨细胞中介宿主入侵致病性和非致病性 rickettsiae
bioRxiv : the preprint server for biology
|May 20, 2024
概括
里克特西亚细菌使用脂胺激素来激活巨细胞上的CD300f受体,从而促进宿主细胞的入侵. 阻止这种相互作用可以保护小鼠免受致命的病,突出显示CD300f是控制感染的关键目标.
科学领域:
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
- 细胞生物学 细胞生物学
背景情况:
- 里克特西亚物种是关节动物传播的毒性病原体,引起人类严重疾病.
- 巨细胞 (MΦ) 是关键的免疫细胞,可以消除或屈服于Rickettsia感染.
- 里克特西亚侵入宿主细胞 (包括MΦ) 的确切机制尚未完全理解.
研究的目的:
- 阐明瑞克特菌入侵宿主细胞,特别是巨细胞的机制.
- 为了研究基酸素 (PS) 和CD300f受体在宿主细胞进入中的作用.
- 评估针对CD300f介导入侵途径的治疗潜力.
主要方法:
- 使用来自野生类型和CD300f淘汰赛小鼠的骨髓衍生巨细胞 (BMDMΦ).
- 评估了Rickettsia物种 (R. typhi,R. rickettsii,R. montanensis) 被BMDMΦ.所吞没的情况.
- 在野生类型和CD300f淘汰赛小鼠中进行了体内感染研究,包括收养转移实验.
主要成果:
- 与野生类型相比,Rickettsia物种被BMDMΦ吞没在CD300f淘汰细胞中显著减少.
- 细菌脂素被确定为可能介导CD300f依赖吞的配体.
- 淘汰赛小鼠的CD300f表现出对致命的Rickettsia感染的保护,具有较低的细菌负担.
- 收养转移研究证实了CD300f表达MΦ在控制病中的关键作用.
结论:
- 里克特西亚物种利用它们的表面脂胺来结合CD300f受体在巨细胞上,促进细菌吞.
- CD300f受体在促进Rickettsia宿主细胞入侵和随后的病变发生方面发挥着重要作用.
- 针对CD300f介导的入侵途径提供了一个有前途的策略,用于开发针对瑞克菌感染的新疗法.
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