肠球增强了Clostridioides difficile的发生
Alexander B Smith1, Matthew L Jenior2, Orlaith Keenan1
1Division of Protective Immunity, Children's Hospital of Philadelphia, Philadelphia, PA, USA.
Nature
|November 17, 2022
概括
机会性肠道细菌,肠,通过改变肠道代谢环境来增加Clostridioides difficile的毒性. 这种相互作用涉及营养交换和代谢重编程,增加了C. difficile的适应性和致病性.
科学领域:
- 微生物学
- 肠道微生物组研究
- 传染性疾病
背景情况:
- 胃肠道是一个复杂的多微生物群体, 影响宿主健康和疾病.
- 微生物相互作用在感染中至关重要,但对共生性或致病性微生物群影响病原体毒性的机制尚未完全理解.
- 困难菌感染 (CDI) 是一个主要的医疗问题,常常因肠道微生物群的破坏而加剧.
研究的目的:
- 研究一种抗生素耐药的机会性病原体 - - 肠球菌的扩散如何影响Clostridioides difficile的适应性和病变性.
- 阐明肠道环境中肠杆菌和C. difficile之间相互作用的代谢机制.
- 提供病原性微生物群在CDI严重性中的作用的机制性见解.
主要方法:
- 利用感染的小鼠模型在体内研究微生物相互作用.
- 分析肠道环境中的代谢变化.
- 研究了C. difficile新陈代谢对肠球菌衍生的营养素和代谢线索的重编程.
- 检查了患有C. difficile感染的患者样本.
主要成果:
- 肠球菌的扩张提高了Clostridioides difficile在肠道中的适应性和病变性.
- 肠杆菌通过营养限制和交叉养重塑肠道代谢格局,提供有利于C. difficile的可发酵氨基酸 (白素,甲素).
- 肠球菌的阿基因减少作为一种代谢信号,增加了C. difficile的毒性.
- 在小鼠模型和人类CDI患者中观察到肠球菌与C. difficile之间的微生物相互作用.
结论:
- 肠杆菌通过调节肠道代谢环境来促进C. difficile的发病.
- 特定的代谢交换,包括营养供应和耗尽,介于C. difficile在肠球菌存在时的增强毒性.
- 这些发现突显了病原性微生物群在导致C. difficile感染的严重性方面的重要作用.
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