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Effects of silver nanoparticles in combination with antibiotics on the resistant bacteria Acinetobacter baumannii

机译:纳米银粉结合抗生素对鲍曼不动杆菌的影响

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摘要

Acinetobacter baumannii resistance to carbapenem antibiotics is a serious clinical challenge. As a newly developed technology, silver nanoparticles (AgNPs) show some excellent characteristics compared to older treatments, and are a candidate for combating A. baumannii infection. However, its mechanism of action remains unclear. In this study, we combined AgNPs with antibiotics to treat carbapenem-resistant A. baumannii (aba1604). Our results showed that single AgNPs completely inhibited A. baumannii growth at 2.5 μg/mL. AgNP treatment also showed synergistic effects with the antibiotics polymixin B and rifampicin, and an additive effect with tigecyline. In vivo, we found that AgNPs–antibiotic combinations led to better survival ratios in A. baumannii-infected mouse peritonitis models than that by single drug treatment. Finally, we employed different antisense RNA-targeted Escherichia coli strains to elucidate the synergistic mechanism involved in bacterial responses to AgNPs and antibiotics.
机译:鲍曼不动杆菌对碳青霉烯类抗生素的耐药性是严重的临床挑战。作为一种新开发的技术,与较旧的治疗方法相比,银纳米颗粒(AgNPs)具有一些优异的特性,并且是对抗鲍曼不动杆菌感染的候选药物。但是,其作用机理仍不清楚。在这项研究中,我们结合了AgNPs和抗生素来治疗耐碳青霉烯的鲍曼不动杆菌(aba1604)。我们的结果表明,单个AgNP可以2.5μg/ mL完全抑制鲍曼不动杆菌的生长。 AgNP治疗还显示出与抗生素多合蛋白B和利福平的协同作用,以及与替加西林的累加作用。在体内,我们发现,与单药治疗相比,AgNPs-抗生素组合在鲍曼不动杆菌感染的小鼠腹膜炎模型中具有更好的存活率。最后,我们采用了不同的靶向RNA的反义大肠杆菌菌株,以阐明涉及细菌对AgNP和抗生素的反应的协同机制。

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