在免疫反应中释放的长链不和脂肪酸刺激宿主-微生物跨王国通信
Aleksander Czauderna1, Grishma Kulkarni1, Niccolò Bianchi1
1Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland; Geneva Centre for Inflammation Research, University of Geneva, Geneva, Switzerland.
主体免疫反应将不和长链脂肪酸 (uLCFA) 释放到肠道中,改变微生物的基因表达. 肠道细菌将这些ULCFA转化为有益的化合物,揭示了一个关键的宿主-微生物群通信循环.
科学领域:
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
- 主体微生物群的相互作用
背景情况:
- 免疫反应极大地影响肠道微生物群的组成和功能.
- 驱动这些微生物转移的宿主媒介尚未完全理解.
研究的目的:
- 在免疫激活期间识别调节肠道共生细菌的宿主衍生分子.
- 阐明免疫反应影响微生物基因表达的机制.
主要方法:
- 使用鞭毛素注射模型模拟小鼠的免疫激活.
- 分析了细菌基因表达的变化,以应对宿主媒介.
- 研究了脂酶在释放脂肪酸到肠道光线中的作用.
- 口服不和长链脂肪酸 (uLCFA),以评估它们对微生物群的影响.
主要成果:
- 鉴定出不和长链脂肪酸 (uLCFA) 作为在免疫激活时释放到肠膜的关键介质.
- 证明uLCFA会改变细菌的基因表达,包括诱导Blautia中的油酸酸酶 (ohyA).
- 表明宿主合酶,如PLA2G5,有助于光线uLCFA释放.
- 证实,口服uLCFA的使用模仿了肠道细菌中的鞭毛素诱导的转录变化.
结论:
- 不和长链脂肪酸 (uLCFA) 作为宿主免疫系统和肠道微生物群之间的关键信号分子.
- 肠道细菌拥有可以排毒ULCFA的机制,产生免疫调节性氧脂肪酸.
- 这项研究揭示了一种新的分子循环,在免疫反应过程中控制宿主微生物群交叉交流.
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