非侵入性细菌病原体Citrobacter rodentium的肠道微生物群独立的毒性
Yue Liu1, Dongqing Xu1, Songwei Guo1
1Department of Biochemistry and Molecular Biology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, United States of America.
PLoS pathogens
|December 4, 2024
概括
杆菌 (Citrobacter rodentium) 在独立于肠道微生物群的无细菌,免疫受损的小鼠中引起严重的结肠炎和致命的感染. 抗生素治疗恶化了结果,揭示了病原体.
科学领域:
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
- 胃肠病学 胃肠病学
背景情况:
- 附着和消除 (A/E) 细菌病原体,包括大肠杆菌和Citrobacter rodentium (CR),导致严重的感染.
- 病原体-微生物群-宿主相互作用在A/E病原体感染中至关重要,特别是在免疫受损的个体中.
研究的目的:
- 在免疫功能低下的小鼠中研究由CR诱导的严重结肠炎和死亡的机制.
- 确定肠道微生物群在CR病原发生中的作用.
主要方法:
- 无细菌 (GF) 介质蛋白22淘汰 (Il22-/-) 和Rag1淘汰 (Rag1-/-) 的小鼠感染了CR.
- 没有特异性病原体 (SPF) 的Il22-/-和Rag1-/-小鼠在CR感染之前被预先用素治疗.
主要成果:
- 在GF Il22-/-和Rag1-/-小鼠中,CR感染导致严重的结肠炎和死亡.
- 在独立于肠道微生物群的GF Il22-/-和Rag1-/-小鼠中,CR被殖民并系统传播.
- 在SPF Il22-/-和Rag1-/-小鼠中,塞福西丁治疗加剧了CR诱导的大肠炎和致死率.
结论:
- CR表现出与肠道微生物群独立的毒性.
- 免疫受损的宿主容易受到CR感染的严重后果.
- 这些发现突显了病原体在易受宿主中的毒性,无论微生物群落如何.
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