来自Enterococcus faecalis的腺因增强了肠道出血性大肠杆菌3型分泌 系统依赖的毒性
Fernando H Martins1,2, Thibaut Rosay3, Anubama Rajan4
1Department of Microbiology, University of Texas Southwestern Medical Center, Dallas, TX, USA.
Nature microbiology
|July 4, 2024
概括
肠道细菌Enterococcus faecalis通过增加腺的产生来增加致病性大肠杆菌 (EHEC) 的毒性. 这种代谢物增强了EHEC.
科学领域:
- 微生物学 微生物学
- 胃肠病学 胃肠病学
- 病原体与宿主之间的相互作用
背景情况:
- 微生物群和肠道病原体的相互作用影响肠道健康,影响殖民抵抗和病原性.
- 众所周知,病原体Enterococcus faecalis可增强肠道出血性大肠杆菌 (EHEC) 的毒性,但潜在的机制尚不清楚.
研究的目的:
- 为了阐明Enterococcus faecalis增强EHEC毒性的机制.
- 研究特定代谢物在调解病原体-微生物群-宿主相互作用中的作用.
主要方法:
- 使用有机体的同时感染模型.
- 代谢分析以确定关键的代谢变化.
- 补充实验和细菌遗传学来验证发现.
主要成果:
- 与E. faecalis共同培养的EHEC显著增加了香氨酸-氨酸通路活性和氨酸生物合成.
- 氨酸由E. faecalis补充或产生,在EHEC中促进了3型分泌系统 (T3SS) 基因表达和附着和消除 (AE) 病变形成.
- 氨酸缓解了T3SS基因表达的高血清素活性 (Hha) 依赖抑制,并在AE病变形成时以AdeP依赖的方式起作用.
结论:
- 来自微生物群的腺素通过上调T3SS表达和促进AE病变的形成来增强EHEC的毒性.
- 这项研究突出了像腺这样的代谢物在调节肠道环境中的病原体毒性方面的复杂作用.
- 了解这些相互作用对于破译肠道中病原体-微生物群-宿主动态至关重要.
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