核糖体结合抗生素可以增加细菌的寿命和生长效率
Emily Wood1,2, Hinrich Schulenburg3, Philip Rosenstiel4
1Biosciences, College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4QD, United Kingdom.
概括
像多西环林这样的细菌静止抗生素可以通过减缓生长来延长营养稀缺期间的细菌寿命. 然而,恢复快速生长的抵抗机制可能会抵消这些长寿益处,在压力下证明有害.
科学领域:
- 微生物学 微生物学
- 细菌生理学 细菌生理学
- 抗生素作用 抗生素作用
背景情况:
- 在现实环境中的细菌面临着营养物质的可用性波动,影响着种群动态.
- 抗生素治疗,细菌生长率和营养压力期间的存活率之间的相互作用尚未得到充分理解.
- 一个增长-寿命的权衡表明,更快的增长导致更快的人口下降.
研究的目的:
- 调查抗生素,它们的分子点和耐药机制如何影响细菌的寿命.
- 为了确定增长缓慢的细菌静止抗生素是否在营养有限的条件下提高生存率.
- 探索特定阻力机制对增长-长寿权衡的影响.
主要方法:
- 使用了暴露于各种抗生素的大肠杆菌种群.
- 在不同的营养可用性场景下,细菌的量化寿命.
- 研究了与具有替代标的抗生素 (多西环素,红色素) 相比,对核糖体结合抗生素 (多西环素,红色素) 的作用.
- 评估了核糖体保护抵抗机制对寿命的影响.
- 研究了多西环素在新陈代谢和反应性氧物种 (ROS) 生产中的作用.
- 分析了核糖体RNA操作子数量与细菌寿命之间的相关性.
主要成果:
- 暴露于核糖体结合抗生素 (多西环素,红素) 的群体在营养压力期间表现出长寿的增加,支持增长-长寿权衡.
- 具有替代细胞点的抗生素没有给长寿带来同样的好处.
- 作为一种抗药机制的核糖体保护,通过恢复生长率,抵消了多西环林的长寿益处.
- 多西环林治疗与更有效的新陈代谢和降低ROS水平有关.
- 核糖体RNA操作子的数量直接影响了细菌的生长和寿命,即使没有抗生素.
结论:
- 某些抗生素诱导的细菌生长速度较慢,可以在随后的营养压力期间提高存活率.
- 核糖体保护作为"特洛伊木马",提供抗生素耐药性,但在营养压力下损害寿命.
- 细菌的寿命受到抗生素类型,耐药性机制和内在因素的影响,如核糖体RNA操作拷贝数.
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