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Updated: Jun 26, 2025

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肺炎杆菌利用内溶体网络进行细胞体生物发生,通过SUMOylated Rab7的合作选择
Chuang Li1, Jiaqi Fu1, Shuai Shao2,3
1Purdue Institute of Inflammation, Immunology and Infectious Disease, Department of Biological Sciences, Purdue University, West Lafayette, Indiana, United States of America.
PLoS pathogens
|May 13, 2024
概括
军团菌肺炎 Lp02rpsLWT 菌株导致巨细胞的细胞死亡. 宿主因子Hmg20a和Nol9通过破坏溶解体来限制细菌的生长,但Hmg20a的枯竭允许复制.
科学领域:
- 微生物学 微生物学
- 细胞生物学 细胞生物学
- 免疫学 免疫学 免疫学
背景情况:
- 具有野生型rpsL的莱吉欧内拉肺炎菌株通过诱导溶酶体损伤和亡来抑制小鼠骨髓衍生巨细胞 (BMDMs) 的复制.
- 介导这种细胞损伤和限制的特定细菌和宿主因素仍未确定.
研究的目的:
- 为了确定限制L. pneumophila Lp02rpsLWT在BMDM中复制的宿主因素.
- 阐明宿主因素影响巨细胞对L. pneumophila感染的反应的机制.
主要方法:
- 在BMDM中进行全基因组CRISPR/Cas9查,以确定宿主限制因素.
- 在已识别的宿主因子的枯竭或过度表达时分析溶酶体损伤,细胞亡和细菌复制.
- 研究涉及细菌效应物和Rab7等宿主蛋白的宿主-病原体相互作用.
主要成果:
- 鉴定出Hmg20a和Nol9是限制L. pneumophila Lp02rpsLWT的宿主因素.
- 消耗Hmg20a保护巨细胞免受 lysosomal损伤和亡,使细菌的复制.
- Hmg20a通过抑制内素蛋白来限制细菌,包括Rab7. SUMOylated Rab7通过Dot/Icm效应器SulF.被招募到细胞体中.
- 过度表达Rab7挽救了L. pneumophila的细胞内生长.
结论:
- 在BMDM中,L. pneumophila利用宿主的溶酶体网络进行菌体生物发生.
- Hmg20a通过调节 lysosomal 途径作为宿主限制因子,影响 L. pneumophila 病原发生.
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