热应激会诱导Enterobacteriaceae中的菌体耐受性
Fan Zhang1, Hao-Ze Chen1, Bo Zheng1
1Center for Infection Biology, School of Basic Medical Sciences, Tsinghua University, Beijing, China.
eLife
|July 7, 2025
概括
热应激通过改变细胞外来增强细菌对菌体的生存,从而促进菌体的抵抗力. 这影响了菌体治疗策略,增加了抗生素耐受性,但也增加了对免疫清除的敏感性.
科学领域:
- 微生物学 微生物学
- 细菌学 细菌学是一门学科.
- 病毒学 病毒学
背景情况:
- 抗生素耐药性需要替代治疗,如菌体治疗.
- 菌体耐药的细菌突变是治疗疗效的重要关注点.
- 细菌持久性是一种异质的生存策略,类似于抗生素持久性.
研究的目的:
- 调查使用Klebsiella pneumoniae及其菌体Kp11.的菌体对细菌持久性的研究.
- 确定热处理对细菌生存和菌体耐药性演变的影响.
- 阐明热引起的细菌包膜变化和应激反应的机制.
主要方法:
- 作为一个模型系统,利用了Klebsiella pneumoniae ATCC 43816和Lytic菌体Kp11.
- 在菌体暴露之前,对细菌培养物进行热处理.
- 分析了细菌包膜成分,菌体DNA注射效率和包膜应激反应.
- 评估了细菌对抗生素 (polymyxin) 的耐受性,对环境变化 (pH) 的敏感性和免疫清除.
主要成果:
- 热处理显著提高了细菌的持久性和在菌体暴露下的存活率.
- 热应激促进了菌体耐药性的进化,通过抑制菌体DNA注射,由于减少了膜组件.
- 热引起的包膜改变赋予了多素耐受性,但增加了对pH值变化和免疫清除的敏感性.
结论:
- 热应激可以悖论地增强细菌对菌体的防御能力,使菌体治疗复杂化.
- 了解热引起的细菌适应对于预测和减轻菌体疗法实施中的挑战至关重要.
- 这些发现为细菌-菌体相互作用和细菌应激反应提供了新的见解.
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