肠道微生物群和细菌病原体之间的免疫媒介间接相互作用
Maryam Keshavarz1, Mathias Franz2, Haicheng Xie2
1Evolutionary Biology, Institute of Biology, Freie Universität Berlin, Berlin, Germany. mariakshvrz@gmail.com.
BMC biology
|September 16, 2025
概括
免疫缺陷 (Imd) 途径及其抗微生物 (AMP) 不介于肠道微生物群和病原体之间的三方相互作用. 然而,肠道微生物群通过增加耐受性而不是耐药性来促进宿主感染期间的生存.
科学领域:
- 昆虫的免疫力 昆虫的免疫力
- 微生物组研究的研究.
- 进化生物学是进化的生物学.
背景情况:
- 感染期间宿主生存依赖于免疫系统和肠道微生物群之间的协调相互作用.
- 免疫缺陷 (Imd) 途径,调节抗微生物 (AMP) 合成,对于宿主-病原体和宿主-微生物群相互作用至关重要.
- 在三方环境 (宿主-微生物群-病原体) 中间间接相互作用中,依赖Imd的AMP的作用尚不清楚.
研究的目的:
- 调查Imd依赖的AMP是否调解肠道微生物群和昆虫病原体感染之间的间接相互作用.
- 探索免疫缺陷 (Imd) 途径对宿主-微生物群-病原体动态的影响.
主要方法:
- 用RNAi介导的Tenebrio molitor Relish (TmRelish) 的淘汰来评估依赖Imd的AMP的功能.
- 分析了肠道微生物群负载和组成.
- 在感染期间监测病原体负载和宿主死亡率.
主要成果:
- TmRelish knockdown 破坏了肠道微生物群,增加了病原体负载,并导致了较高的宿主死亡率.
- 没有证据表明依赖Imd的AMP会调解肠道微生物群和病原体感染之间的间接相互作用.
- 病原体感染增加了肠道微生物群负载,刺激了一些AMP,但这并没有减少病原体负载.
- 肠道微生物群没有影响病原体负载,但增强了宿主存活率,表明耐受性增加.
结论:
- 在这种昆虫模型中,依赖IMD的AMP可能不是三方相互作用的主要媒介.
- 微生物群与宿主之间的相互作用,包括免疫原始化和改变的微生物群负载,显著影响感染结果.
- 这些相互作用对细菌毒性的进化产生选择性压力.
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