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细菌抗毒素HigA以T6SS依赖的方式调节宿主肠道的血清稳定
Chunli Li1, Boya Zhang1, Yuanxing Zhang2
1State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China.
Cell reports
|September 2, 2025
概括
在感染期间,致病细菌会增加肠道的血清素. 这会触发一种细菌蛋白质 (HigA) 干扰血清的产生,从而加剧宿主损伤并促进感染. 这突显了一种关键的病原体策略.
科学领域:
- 微生物学和免疫学
- 肠-大脑轴研究
- 主体与病原体的相互作用
背景情况:
- 肠道中的血清素对肠道与大脑的沟通以及宿主微生物的活力至关重要.
- 在感染期间导致肠道血清素水平波动的机制尚不清楚.
研究的目的:
- 阐明肠道胺水平在Edwardsiella piscicida感染期间发生变化的机制.
- 研究细菌效应剂在调节宿主血清素代谢和感染结果中的作用.
主要方法:
- 在E. piscicida感染期间对宿主肠道血清素水平的分析.
- 细菌效应物HigA及其与宿主目标的相互作用的识别和描述.
- 研究HigA在调节氨酸二氧化酶1 (IDO1) 表达和氨酸代谢中的作用.
- 在感染模型中评估宿主组织损伤和细菌负载.
- 使用感染Salmonella的小鼠模型研究HigA同类物.
主要成果:
- 在E. piscicida感染的早期,肠道中血清激素水平会升高.
- 细菌蛋白HigA作为一个跨王国效应体,转移到宿主核.
- 高A 调节 IDO1 的表达,转移三甲代谢并损害血清素的产生.
- 肠道中血清素的降低加剧了宿主组织的损伤,并促进了细菌的增殖.
- 在感染Salmonella的小鼠模型中,HigA同类物会影响血清素代谢和肠道损伤.
结论:
- 像E. piscicida这样的病原体会操纵宿主肠道中的血清素水平作为感染的策略.
- T6SS-HigA-血清素轴代表了病原体用来调节宿主免疫力并促进全身感染的保存机制.
- 针对这一轴可以提供针对细菌感染的新疗法.
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