艰难的Clostridioides主要毒素重塑肠道上皮质,影响子粘附/内化到肠道组织,以及它们与肠道维特龙菌素的关联
Pablo Castro-Cordova1,2,3, Osiris K Lopez-Garcia4,5, Josué Orozco1
1Millennium Nucleus in the Biology of Intestinal Microbiota, Santiago, Chile.
bioRxiv : the preprint server for biology
|February 20, 2025
概括
困难 Clostridioides 毒素 (TcdA/TcdB) 改变宿主细胞的蛋白质,如纤维内素和维特内素,促进 C. difficile 子的粘附和内化,可能增加疾病复发.
科学领域:
- 微生物学 微生物学
- 病原体与宿主相互作用
- 胃肠病学 胃肠病学
背景情况:
- 困难菌感染 (CDI) 是与医疗相关的腹的主要原因.
- 毒素TcdA和TcdB是关键的毒性因素,而子驱动传播和复发.
- 毒素介导的损伤与子持续性和CDI复发有关.
研究的目的:
- 研究C. difficile毒素 (TcdA/TcdB) 如何影响宿主细胞外基质蛋白及其在子与宿主相互作用中的作用.
- 为了确定毒素诱导的纤维内素和视内素的变化是否有助于C. difficile子粘附和内部化.
主要方法:
- 肠上皮Caco-2细胞和小鼠肠组织暴露于TcdA/TcdB.
- 纤维肌肉素 (Fn) 和视肌肉素 (Vn) 的水平使用西式涂抹和ELISA进行了评估.
- 进行了结合性试验,以评估Fn/Vn与C. difficile子的相互作用.
- 在体内研究中使用了受C. difficile感染的绑定小鼠环,有或没有抗TcdB抗体治疗.
主要成果:
- TcdA/TcdB中毒改变了Caco-2细胞中的Fn和Vn水平.
- TcdB中毒增加了肠道组织中的细胞内Vn.
- 在C. difficile子中,Fn和Vn在体内与超体结合.
- TcdB中毒增强了C. difficile子在小鼠肠道组织中的粘附和内化.
- 抗TcdB抗体治疗没有防止子粘附/内化因毒素介导的增加.
结论:
- 困难菌毒素改变宿主组织蛋白质,促进子粘附和内化.
- 这些毒素诱导的宿主表面变化可能会导致C. difficile的持久性和疾病复发.
- 准毒素与宿主相互作用可能是防止CDI复发的策略.
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