Facet

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Facet

2024-07-06 23:36| 来源: 网络整理| 查看: 265

Abstract Engineered nanomaterials have attracted significantly attention as one of the most promising antimicrobial agents for against multidrug resistant infections. The toxicological responses of nanomaterials are closely related to their physicochemical properties, and establishment of a structure-activity relationship for nanomaterials at the nano-bio interface is of great significance for deep understanding antibacterial toxicity mechanisms of nanomaterials and designing safer antibacterial nanomaterials. In this study, the antibacterial behaviors of well-defined crystallographic facets of a series of Au nanocrystals, including {100}-facet cubes, {110}-facet rhombic dodecahedra, {111}-facet octahedra, {221}-facet trisoctahedra and {720}-facet concave cubes, was investigated, using the model bacteria Staphylococcus aureus. We find that Au nanocrystals display substantial facet-dependent antibacterial activities. The low-index facets of cubes, octahedra, and rhombic dodecahedra show considerable antibacterial activity, whereas the high-index facets of trisoctahedra and concave cubes remained inert under biological conditions. This result is in stark contrast to the previous paradigm that the high-index facets were considered to have higher bioactivity as compared with low-index facets. The antibacterial mechanism studies have shown that the facet-dependent antibacterial behaviors of Au nanocrystals are mainly caused by differential bacterial membrane damage as well as inhibition of cellular enzymatic activity and energy metabolism. The faceted Au nanocrystals are unique in that they do not induce generation of reactive oxygen species, as validated for most antibiotics and antimicrobial nanostructures. Our findings may provide a deeper understanding of facet-dependent toxicological responses and suggest the complexities of the nanomaterial-cell interactions, shedding some light on the development of high performance Au nanomaterials-based antibacterial therapeutics.

中文翻译:

金纳米晶的面依赖性抗菌活性

摘要工程纳米材料作为对抗多药耐药性感染的最有希望的抗菌剂之一,已经引起了广泛的关注。纳米材料的毒理学反应与其物理化学性质密切相关,在纳米生物界面处建立纳米材料的结构-活性关系对深入了解纳米材料的抗菌毒性机理和设计更安全的抗菌纳米材料具有重要意义。在这项研究中,一系列Au纳米晶体的明确晶体学刻面的抗菌行为包括{100}-刻面立方体,{110}-刻面菱形十二面体,{111}-刻面八面体,{221}-刻面三八面体和使用模型细菌金黄色葡萄球菌研究了{720}-刻面凹面立方体。我们发现金纳米晶体显示大量的面依赖抗菌活性。立方体,八面体和菱形十二面体的低折射率小面显示出显着的抗菌活性,而三八面体和凹面立方体的高折射率小面在生物学条件下保持惰性。该结果与先前的范例形成鲜明对比,在先前的范例中,与低折射率的刻面相比,高折射率的刻面被认为具有更高的生物活性。抗菌机理研究表明,金纳米晶的面依赖性抗菌行为主要是由不同的细菌膜损伤以及细胞酶活性和能量代谢的抑制引起的。多面金纳米晶的独特之处在于它们不会诱导活性氧的产生,经验证可用于大多数抗生素和抗菌纳米结构。我们的发现可能提供对方面依赖性毒理学反应的更深刻理解,并提示纳米材料与细胞相互作用的复杂性,从而为基于高性能金纳米材料的抗菌疗法的发展提供了一些启示。



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