New toxicity mechanism of silver nanoparticles: promoting apoptosis and inhibiting proliferation.

New toxicity mechanism of silver nanoparticles: promoting apoptosis and inhibiting proliferation.
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DOI:
10.1371/journal.pone.0122535
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发表时间:
2015
期刊:
影响因子:
3.7
通讯作者:
Liu Y
Liu Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Bao H;Yu X;Xu C;Li X;Li Z;Wei D;Liu Y

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银纳米颗粒在生物学应用中的实用性,特别是抗菌作用越来越受到认可。本文采用光密度法和菌落形成单位法证实了银纳米颗粒对大肠杆菌的抗菌作用,并采用流式细胞术、透射电镜和BrdU ELISA法研究了银纳米颗粒对大肠杆菌的抗菌作用机制。从结果中,我们得出结论,银纳米粒子可以同时诱导细胞凋亡,并抑制新的DNA合成在一个积极的浓度依赖性的方式。该研究首次提出了银纳米颗粒在该领域诱导这些细菌细胞凋亡的方法。我们的发现可能为银纳米粒子在抗菌应用中的应用提供一种新的策略。
Silver nanoparticles are increasingly recognized for their utility in biological applications, especially antibacterial effects. Herein, we confirmed the antibacterial effect of silver nanoparticles on Escherichia coli using the conventional optical density (OD) and colony-forming units (CFU) method and used flow cytometry (FC), TEM and BrdU ELISA to investigate the mechanisms of this effect. From the results, we conclude that AgNPs can simultaneously induce apoptosis and inhibit new DNA synthesis in the cells in a positive concentration-dependent manner. This study presents the first induction of apoptosis in these bacteria by AgNPs in this field. Our findings may provide a new strategy for the use of silver nanoparticles in antibacterial applications.
掺入银纳米粒子的抗菌纳米结构二氧化钛涂层
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