细胞内沙门氏菌劫持了线粒体酸盐载体,以逃避宿主氧化防御
Chieh-Hua Fu1, Yu-Ting Hsu1, Shao-Chun Hsu2
1Graduate Institute of Microbiology, College of Medicine, National Taiwan University, Taipei, Taiwan.
Nature communications
|November 6, 2025
概括
沙门氏菌Typhimurium劫持了宿主线粒体酸盐载体 (CIC) 以排毒其真空细胞,促进生存. 抑制CIC可以提供针对这种细胞内病原体的新疗法策略.
科学领域:
- 微生物学 微生物学
- 细胞生物学 细胞生物学
- 病原体与宿主之间的相互作用
背景情况:
- 细胞内病原体位于含有病原体的真空体 (PCV) 中.
- 保持PCV完整性对于病原体的生存和扩散至关重要.
- 沙门氏菌 (Salmonella enterica serovar Typhimurium) 是一种在宿主细胞内复制的细胞内病原体.
研究的目的:
- 为了研究宿主因子在沙门氏菌Typhimurium细胞内复制中的作用.
- 阐明沙门氏菌 Typhimurium 在宿主细胞内生存的机制.
- 为了确定沙门氏菌感染的潜在治疗点.
主要方法:
- 在宿主细胞中研究了沙门氏菌Typhimurium的复制,其酸盐载体 (CIC) 表达水平各不相同.
- 评估了CIC对含沙门氏菌真空体 (SCV) 的招募情况.
- 分析了CIC对SCVs反应性氧物种 (ROS) 生产和氧化应激的影响.
- 使用共免疫沉和显微镜识别了沙门氏菌效应因子SseF,CIC和RAB7之间的蛋白质相互作用.
主要成果:
- 失去CIC显著损害了沙门氏菌Typhimurium细胞内生长.
- CIC被招募到SCV,调节当地酸盐水平并减轻ROS产量.
- 沙门氏菌SPI-2效应因子SseF被确定为与CIC和RAB7相互作用的关键因素,以调解CIC招募到SCV.
- 对CIC的药理抑制使沙门氏菌对宿主免疫压力敏感.
结论:
- 沙门氏菌Typhimurium选择宿主线粒体CIC来排毒SCV,创造了一个允许的复制利基.
- 通过调节酸盐水平和减轻ROS产量,CIC招募到SCVs可以减少氧化应激.
- 对于这种病原体生存策略来说,SseF-CIC-RAB7相互作用至关重要.
- 在沙门氏菌感染中,CIC是潜在的宿主导治疗点.
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