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PLoS One. 2015 Mar 30;10(3):e0122535. doi: 10.1371/journal.pone.0122535. eCollection 2015.

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

Author information

1
School of Laboratory Science, Tianjin Medical University, Tianjin, China.
2
The 4th Central Hospital, Tianjin, China, China.
3
School of Materials Science and Engineering, Tianjin University, Tianjin, China.
4
The Department of Laboratory Science, The Second Hospital of Tianjin Medical University, Tianjin, China.

Abstract

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.

PMID:
25822182
PMCID:
PMC4378976
DOI:
10.1371/journal.pone.0122535
[Indexed for MEDLINE]
Free PMC Article

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