复制性Acinetobacter baumannii菌株通过调节真空的pH值来干扰法体成熟
Jesus S Distel1, Gisela Di Venanzio1, Joseph J Mackel2
1Department of Molecular Microbiology, Washington University School of Medicine, Saint Louis, Missouri, United States of America.
PLoS pathogens
|June 9, 2023
概括
临床Acinetobacter baumannii分离物,与实验室菌株不同,可以通过防止和氨酸的体酸化,在肺巨体内生存. 这种巨细胞生存机制可能解释了它们在肺炎期间的持久性.
科学领域:
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
- 病变的发生和发病.
背景情况:
- 多种药物耐药的Acinetobacter baumannii会导致危险的医院肺炎.
- 膜巨细胞对于对抗呼吸道感染至关重要.
- 临床A. baumannii菌株,而不是实验室菌株,在Acinetobacter含有真空体 (ACV) 内的巨细胞中持久.
研究的目的:
- 为了研究肺炎期间膜巨细胞中临床A. baumannii分离物 (398) 与实验室菌株 (19606) 的体内存活率.
- 为了阐明A. baumannii在巨细胞内持续存在的机制.
主要方法:
- 在小鼠肺炎模型中,膜巨细胞感染了A. baumannii菌株398和19606.
- 使用内细胞通路标记物 (EEA1,LAMP1) 和自的巨细胞内细菌命运的分析.
- 通过A. baumannii.测量体酸化和氨分泌.
主要成果:
- 临床隔离物398,但不是实验室菌株19606,感染了膜巨细胞,并在体内形成了ACVs.
- 菌株19606通过自降解,而菌株398在ACV中复制.
- 菌株398通过分泌氨,氨基酸代谢的副产品,防止了细胞酸化.
结论:
- 临床A. baumannii分离物具有独特的机制,可以在膜巨细胞内生存.
- 氨的分泌使得A. baumannii能够逃避菌体的酸化和降解.
- 巨细胞的存活率是临床A. baumannii菌株在肺炎中肺部持久性的关键因素.
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