皮奥韦丁-抗生素联合治疗:其疗效及其对大肠杆菌耐药性演变的影响
Vera Vollenweider1, Flavie Roncoroni1, Rolf Kümmerli1
1Department of Quantitative Biomedicine, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.
microLife
|November 6, 2024
概括
铁化化合物皮欧维丁 (pyoverdine) 显示出对抗生素耐药细菌的潜在作用. 将pyoverdine与ceftazidime (一种抗生素) 结合在一起,减弱了耐药性,特别是在携带等离子体的大肠杆菌菌株中.
科学领域:
- 微生物学 微生物学
- 传染性疾病 传染性疾病
- 药物发现 药物发现 药物发现
背景情况:
- 抗生素耐药性对全球健康构成重大威胁.
- 来自* Pseudomonas* spp. 的皮欧维丁, siderophores,通过铁饥饿诱导细菌生长停止.
- 皮欧维丁与抗生素的相互作用及其对抗药性演变的影响在很大程度上尚未被探索.
研究的目的:
- 研究大肠杆菌对pyoverdine,ceftazidime及其组合的耐药性的演变.
- 确定遗传背景的影响,包括在等离子体上存在*bla*TEM-1β-乳糖酶基因,对抗性选择的影响.
- 在抗生素耐药性的背景下,了解pyoverdine和ceftazidime之间的相互作用.
主要方法:
- 在单一和组合治疗下,对三种大肠杆菌菌株 (野生型和两个染色体或等离子体上具有黑色TEM-1的同源变体) 的实验进化.
- 基因组分析以确定赋予耐药性的突变.
- 对pyoverdine和ceftazidime耐药水平的表型特征.
主要成果:
- 单次使用塞夫塔齐或皮沃尔丁治疗导致所有大肠杆菌菌株的耐药性进化.
- 塞法胺耐药性与波林基因 (*envZ*, *ompF*) 的突变有关,而皮沃尔丁耐药性则涉及寡透酶 (*opp*) 操作子.
- 组合治疗减弱了对塞夫塔齐迪姆的耐药性,特别是在携带等离子体的菌株中,这表明皮沃尔丁对这些变体的疗效有所提高.
结论:
- 皮沃尔丁和塞夫塔齐迪姆呈现中性相互作用.
- 皮欧维丁对携带等离子体的大肠杆菌 (E. coli) 具有强大的抗菌活性,这可能是由于细胞代谢受损和在铁缺乏下等离子体复制的原因.
- 皮欧维丁代表了对抗抗生素耐药性的有希望的策略,特别是在具有耐药性等离子体的菌株中.
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