宿主和微生物介导的粘素降解不同的形状 Pseudomonas aeruginosa 生理学和基因表达
Sabrina J Arif1, Kayla M Hoffman1, Jeffrey M Flynn1
1Department of Microbiology & Immunology, University of Minnesota, Minneapolis, Minnesota, United States of America.
PLoS pathogens
|October 3, 2025
概括
粘膜的微生物分解推动了Pseudomonas aeruginosa在囊性纤维化 (CF) 呼吸道中的生长,与宿主酶降解不同. 这种交叉养支持P. aeruginosa在CF肺环境中的适应和基因表达.
科学领域:
- 微生物学 微生物学
- 宿主-病原体相互作用
- 代谢生物化学 代谢生物化学
背景情况:
- Pseudomonas aeruginosa 是囊性纤维化 (CF) 呼吸道的关键病原体,通常与降解粘素的微生物一起发现.
- P. aeruginosa 具有有限的直接使用粘膜的能力,依靠交叉养来获得首选的营养素.
- 宿主衍生酶与微生物活性在P. aeruginosa生长中的粘素分解中的作用尚未完全理解.
研究的目的:
- 为了比较微生物与宿主粘合活性对P. aeruginosa生理学的营养影响.
- 为了研究P. aeruginosa和CF肺中的粘素降解微生物之间的代谢交叉食相互作用.
- 了解素降解如何影响P. aeruginosa的基因表达和适应 in vivo.
主要方法:
- 分析囊性纤维化 (CF) 唾液的粘真菌完整性和微生物/宿主因素.
- 培养P. aeruginosa与无氧细菌降解的粘膜与中性粒细胞弹性酶相比.
- 有针对性的代谢组学来识别关键的交叉养代谢物.
- 转录组和表型分析以评估P. aeruginosa的生理反应.
- 在体外基因表达特征与体内数据的比较.
主要成果:
- 厌氧细菌对氨酸的降解显著促进了P. aeruginosa的生长,与仅仅由中性粒细胞弹性酶的降解不同.
- 乙酸盐和酸盐被确定为驱动微生物交叉养的关键代谢物.
- P. aeruginosa 在粘素衍生基质上表现出二氧化生长,并诱导了脱和发酵途径.
- 在无氧条件的粘膜上生长的P. aeruginosa的转录概况更接近体内基因表达.
结论:
- 跨物种代谢相互作用,特别是微生物粘素降解,对于P. aeruginosa在CF肺中的生长和适应至关重要.
- 与无氧细菌的交叉养提供了必需的营养,并影响P. aeruginosa生理学,包括基因表达.
- 这些发现突出了宿主和微生物因素在CF气道环境中塑造病原体行为的复杂相互作用.
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