一种对pH值有反应的两和一种常规抗生素的组合,用于治疗阴性细菌
Mingrui Liao1, Haoning Gong1, Huayang Liu1
1Biological Physics Laboratory, Department of Physics and Astronomy, School of Natural Science, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
Journal of colloid and interface science
|January 6, 2024
概括
新的pH响应性抗微生物 (AMP) 显示出治疗像H.pylori这样的感染的前景. 这些可以在酸性条件下向致病细菌,最大限度地减少对有益细菌的伤害,降低抗生素耐药性的风险.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 材料科学 材料科学 材料科学
背景情况:
- 胃部感染的抗生素治疗可以杀死有益的细菌并促进耐药性.
- 开发响应pH的抗微生物 (AMP) 对于在酸性环境中向H. pylori和耐药大肠杆菌等病原体至关重要.
- AMP应尽量减少对开始性细菌的影响,避免诱导抗生素耐药性.
研究的目的:
- 描述两种新型两性AMP的pH响应的生理化学特性和抗菌性能.
- 为了研究它们对格拉姆阴性细菌的抗菌作用的结构基础.
- 评估它们与现有抗生素产生协同作用的潜力.
主要方法:
- 使用了细胞分析,分子动力学 (MD) 模拟和膜模型的组合.
- 采用生物物理和生物化学测量,包括小角度中子散射 (SANS).
- 描述了AMP与细菌膜的相互作用及其对膜潜力和质子动力的影响.
主要成果:
- 一个AMP (3D) 在酸性pH的水环境中自组装成纳米纤维,而另一个 (2D) 则保持无序.
- AMP与细菌膜的pH反应相互作用,导致膜泄漏和脱极化.
- AMP证明了与LPS结合,外膜透性变化和内膜脱极化有关的差异性抗菌疗效.
- 当将AMP与米诺环素结合在酸性条件下对抗阴性细菌时,观察到协同效应.
结论:
- 设计的AMP显示了依赖pH的抗微生物活性,在酸性条件下有效向致病细菌.
- 它们的机制涉及破坏细菌膜完整性和质子动力.
- 这些AMP有可能用于治疗胃部感染,和伤口愈合,为传统抗生素提供替代方案.
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