Investigation of the cytotoxicity mechanism of silver nanoparticles in vitro

Abstract

Nowadays, more and more nanotechnology products and nanomaterials are being applied in our lives. Silver nanoparticles (SNPs) are used in infection prevention and treatment due to their antimicrobial activity. However, as a kind of nanomaterial, the toxicology of SNPs has not been completely studied. The mechanism of cytotoxicity of SNPs in vitro to mouse's fibroblast cells (L929) was investigated in this study. As a contrast, silver microparticles (SMPs) were also studied. Propidium iodide (PI) single staining and Annexin-V/PI staining were carried out to unveil the influence of SNPs and SMPs on the cells. A transmission electron microscope (TEM) was used to observe SNPs’ distribution in the cells. The results of cell cycle analysis indicated that the cells treated with SNPs were arrested in the G2M phase. Meanwhile, SNPs lead to apoptosis of more cells compared to SMPs at the same dose as a result of apoptosis analysis. Analysis of the cells’ ultrastructure showed that SNPs could be phagocytized into the cells while SMPs could not. The mechanism of cytotoxicity of SNPs in vitro to L929 cells may be that SNPs are phagocytized into the cells and they interact with mitochondria or other organelles, even nuclei, which results in cells’ apoptosis or necrosis.

Cytotoxicity of gold nanoclusters in human liver cancer cells

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Silver and fullerene nanoparticles’ effect on interleukin-2-dependent proliferation of CD4 (+) T cells

“…significantly decreased cell viability (Guo et al, 2013;Wei et al, 2010;AshaRani et al, 2009). Prasad et al had established that the smaller (10 nm) Ag-NPs were more toxic (Prasad et al, 2013).…”

Exploration on the safety assessment of nanomaterials in China

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