CELL HOST MICROBE:肠道微生物副产物可以预防沙门氏菌

2018-07-29 海北 MedSci原创

最近,来自斯坦福大学的研究人员通过比较具有不同定殖抗性水平的高复杂性共生群落来鉴定微生物群介导的针对鼠伤寒沙门氏菌(S. Typhimurium)的定殖抗性机制。

肠道微生物群提供针对病原体的定殖抗性,限制病原体扩增和传播。这些微生物群介导的机制是以前通过观察抗生素治疗后的定植抗性丧失或饮食变化来确定的,但这严重破坏了微生物群落。

最近,来自斯坦福大学的研究人员通过比较具有不同定殖抗性水平的高复杂性共生群落来鉴定微生物群介导的针对鼠伤寒沙门氏菌(S. Typhimurium)的定殖抗性机制。

使用具有不同感染动力学和鼠伤寒沙门氏菌肠道负荷的近交小鼠品系,研究人员证明拟杆菌物种通过产生短链脂肪酸丙酸盐介导针对鼠伤寒沙门氏菌的定殖抗性。

丙酸盐通过破坏细胞内pH稳态直接抑制体外病原体生长,化学增加肠道丙酸盐水平可保护小鼠免受鼠伤寒沙门氏菌的侵害。此外,给予易感小鼠拟杆菌,而非丙酸突变体,赋予小鼠对抗鼠伤寒沙门氏菌的抗性。

这项工作提供了个体化微生物群落在病原体传播的宿主-宿主变异性中的作用机理。


原始出处:

Amanda Jacobson et al. A Gut Commensal-Produced Metabolite Mediates Colonization Resistance to Salmonella Infection. Cell Host & Microbe, 2018; DOI: 10.1016/j.chom.2018.07.002


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    2018-12-18 xjy02
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    2018-11-20 智慧医人
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    2018-08-04 liumin1987

    肠道菌菌平衡。

    0

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