ACS Cent Sci:自组装rAgNAs可有效杀死多种耐药菌

2019-09-10 不详 网络

细菌生物膜对公众健康构成重大威胁,因为它们对大多数现有疗法具有抗性。常规抗生素在生物膜的酸性微环境中表现出有限的渗透性和弱的活性。本研究报道了由自组装银纳米团簇和pH敏感电荷逆转配体组成的生物膜响应性纳米抗生素(rAgNA)的开发,其杀菌活性可在生物膜微环境中选择性地增强。 在中性生理条件下,rAgNAs的杀菌活性是自猝灭的,因为有毒银离子的释放受到很大抑制;然而,在进入酸性生物膜微环境

细菌生物膜对公众健康构成重大威胁,因为它们对大多数现有疗法具有抗性。常规抗生素在生物膜的酸性微环境中表现出有限的渗透性和弱的活性。本研究报道了由自组装银纳米团簇和pH敏感电荷逆转配体组成的生物膜响应性纳米抗生素(rAgNA)的开发,其杀菌活性可在生物膜微环境中选择性地增强。


 在中性生理条件下,rAgNAs的杀菌活性是自猝灭的,因为有毒银离子的释放受到很大抑制;然而,在进入酸性生物膜微环境后,rAgNAs不仅表现出电荷反转以促进局部积累和保留,而且还分解成小的银纳米团簇,因此能够深度渗透并加速释放银离子以显着扩增杀菌活性。rAgNAs在体外和体内都表现出优异的抗生物膜活性,rAgNAs治疗可显着降低多药耐药生物膜诱导的严重脓性骨炎小鼠的死亡率,表明rAgNAs作为高效纳米级的巨大潜力抗菌剂,以对抗抗细菌生物膜相关感染

原始出处:

Wu J, Li, et al., Responsive Assembly of Silver Nanoclusters with a Biofilm Locally Amplified Bactericidal Effect to Enhance Treatments against Multi-Drug-Resistant Bacterial Infections. ACS Cent Sci. 2019 Aug 28;5(8):1366-1376. doi: 10.1021/acscentsci.9b00359. Epub 2019 Jun 18.

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    2019-09-12 yaanren
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