Studies on the biocompatibility and the interaction of silver nanoparticles with human mesenchymal stem cells (hMSCs)
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Silver nanoparticles (Ag-NPs) are widely used in different areas, e.g., in the food, electronic, or clothing industry due to well-known slow-release antiseptic activities. Despite the widespread use of nanosilver, there is a serious lack of information concerning the biological activities of nanosilver on human tissue cells.
Materials and methods
In this study, the influence of spherical Ag-NPs (diameter about 100 nm) on the biological functions (proliferation, cytokine release, and chemotaxis) of human mesenchymal stem cells (hMSCs) was analyzed.
The results showed a concentration-dependent activation of hMSCs at nanosilver levels of 2.5 μg mL−1, and cytotoxic cell reactions occurred at Ag-NPs concentrations above 5 μg mL−1. Cell proliferation and the chemotaxis of hMSC both decreased with increasing Ag-NPs concentrations. Different effects on the cytokine release from hMSCs were observed in the presence of Ag-NPs and Ag+ ions. The release of IL-8 was significantly increased at high but noncytotoxic concentrations of Ag-NPs (2.5 μg mL−1). In contrast, the levels of IL-6 and VEGF were concomitantly decreased compared to the control group. The synthesis of IL-11 was not affected at different Ag-NP concentrations. The agglomeration tendency of Ag-NPs in different biological media increased with a high electrolyte content, e.g., in RPMI. However, complexation with fetal calf serum in the cell culture media stabilized the Ag-NPs against agglomeration.
In summary, the results showed that Ag-NPs exert cytotoxic effects on hMSCs at high concentrations but also induce cell activation (as analyzed by the release of IL-8) at high but nontoxic concentrations of nanosilver.
KeywordsMesenchymal stem cells Silver nanoparticles Cytokine release Chemotaxis
Special thanks to the Deutsche Forschungsgemeinschaft (DFG) for financial support in the framework of the priority program NanoBioResponses (SPP 1313).
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