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Interaction of multi-walled carbon nanotubes and zinc ions enhances cytotoxicity of zinc ions

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Abstract

More and more nanomaterials enter the environment along with their production, application and deposal. They may alter the biological effect of pollutants already existing in the real environment by different interactions. Therefore efforts should also be paid to investigate the combined toxicity of nanomaterials and pollutants. Herein, we studied the combined toxicity of oxidized multi-walled carbon nanotubes (O-MWCNTs) and zinc ions on cells. It is found that cytotoxicity of the combined O-MWCNTs and zinc ions elevates significantly, compared with O-MWCNTs or zinc ions alone. This result comes from the assays of cell morphology, cell viability and proliferation, cell membrane integrity, mitochondrial membrane potential and cell apoptosis. Mechanism studies indicate that O-MWCNTs absorb zinc ions and form slight aggregation. These enhance remarkably the cellular uptake of O-MWCNTs, and thus induce the death of cells by bringing in more zinc ions into cells. Our study indicates that the existence of nanomaterials could change the bioconsequence of other pollutants and emphasizes the importance of the combined toxicity research in the presence of nanomaterials.

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Correspondence to Haifang Wang.

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Wang, L., Liu, JH., Song, ZM. et al. Interaction of multi-walled carbon nanotubes and zinc ions enhances cytotoxicity of zinc ions. Sci. China Chem. 59, 910–917 (2016). https://doi.org/10.1007/s11426-016-5591-2

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  • DOI: https://doi.org/10.1007/s11426-016-5591-2

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