菌体触发抗病毒免疫力,并防止细菌感染的清除
Johanna M Sweere1,2, Jonas D Van Belleghem1, Heather Ishak1,3
1Division of Infectious Diseases and Geographic Medicine, Department of Medicine, Stanford University, Stanford, CA, USA.
Science (New York, N.Y.)
|March 30, 2019
概括
来自Pseudomonas aeruginosa的细菌菌体 (Pf) 通过触发天生的抗病毒反应来削弱宿主免疫力. 对这些菌体的疫苗可以预防细菌性伤口感染,提供一种新的治疗策略.
科学领域:
- 微生物学和免疫学
- 病毒与细菌的相互作用
- 天生的免疫力
背景情况:
- 菌体在细菌感染部位普遍存在,但它们对宿主免疫力的影响尚未完全理解.
- 伪菌 (Pseudomonas aeruginosa) 的伤口感染通常与慢性感染和细丝型Pf菌的存在有关.
研究的目的:
- 研究Pf菌在细菌感染中的致病作用.
- 阐明Pf影响宿主免疫反应的机制.
- 探索抗Pf疫苗作为对抗Pa感染的策略的潜力.
主要方法:
- 在小鼠模型中研究Pa伤口感染.
- 对白细胞与Pf菌相互作用的分析.
- 研究细胞内信号通路,包括托尔类受体3 (TLR3) 和含有TIR域的适配器诱导干扰素β (TRIF).
- 测量细胞因子的产生 (I型干扰素,TNF) 和细胞活性.
- 对抗Pf免疫在预防细菌感染方面的有效性评估.
主要成果:
- 在小鼠中,Pf菌促进了Pa伤口感染,并与人类的慢性Pa伤口感染有关.
- 白细胞内化Pf,导致菌体RNA的产生和TLR3-TRIF依赖型I干扰素的激活.
- 这种反应抑制了瘤亡因子 (TNF) 的产生,并抑制了细胞形成,从而降低了细菌的清除.
- 在小鼠中,对Pf的免疫有效地预防了Pa的伤口感染.
结论:
- 通过病毒模式识别,Pf菌会触发不适应的先天免疫反应,从而阻碍细菌的清除.
- 通过疫苗接种向菌体病毒是一种有希望的预防和治疗像Pa引起的细菌感染的策略.
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