艰难的 Clostridioides 殖民不是通过胆汁盐的介导,并利用Stickland发酵的在一个体外模型模型
Xiaoyun Huang1, April E Johnson1, Joshua N Brehm2
1Department of Food Science and Technology and Nebraska Food for Health Center, University of Nebraska-Lincoln, Lincoln, NE 68588 USA.
bioRxiv : the preprint server for biology
|July 29, 2024
概括
抗生素的使用破坏了肠道微生物,增加了Clostridioides difficile感染的风险. 艰难的C. 的质发酵是殖民的关键,独立于胆汁盐,建议新的治疗点.
科学领域:
- 微生物学 微生物学
- 胃肠病学 胃肠病学
- 传染性疾病 传染性疾病
背景情况:
- 抗生素治疗是Clostridioides difficile感染 (CDI) 的主要危险因素.
- 肠道微生物群通常通过胆盐代谢和营养竞争来防止CDI.
- 抗生素诱导的CDI易感性背后的机制仍然不完全理解.
研究的目的:
- 研究抗生素治疗如何影响肠道微生物群的组成和功能.
- 确定胆盐代谢和营养素竞争在CDI易感性中的作用.
- 为了确定特定的微生物代谢途径,对C. difficile殖民至关重要.
主要方法:
- 采用了模拟远端结肠状况的连续流模型.
- 从健康个体培养了12个不同的微生物群落.
- 用六种临床使用的抗生素治疗社区,并评估C. difficile殖民.
- 分析了微生物丰富度,胆盐代谢和氨基酸发酵的变化.
主要成果:
- 抗生素治疗减少了微生物丰富性,但与CDI易感性无关.
- 失调的胆盐代谢 (增加胆酸盐) 也与CDI易感性无关.
- 缺乏proline发酵的C. difficile突变体在接受抗生素治疗的社区中显著减少了殖民.
- 甘氨酸或氨酸发酵缺陷并没有限制C. difficile的殖民.
结论:
- 胆盐代谢不是限制C. difficile殖民后抗生素的主要机制.
- 氨基酸发酵,特别是通过Stickland发酵利用普罗林,对于C. difficile殖民至关重要.
- 氨酸发酵是预防CDI的潜在治疗标.
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