Abstract
The cytotoxicity and colloidal behavior of surface-functionalized polystyrene latex (PSL) nanoparticles (NPs) (nominal diameter: 100 nm) toward a model gram positive bacterium Lactococcus lactis JCM 5805 were examined. Nearly all the L. lactis cells exposed to the negatively charged PSL NPs survived because the surface of the bacterial cell was charged negatively, and the NPs therefore hardly adhere to the cell surface. In contrast, the positively charged PSL NPs adhered to the L. lactis cell surface but were not entrapped within the cell, and cell death subsequently occurred. The bacterial growth curves after the toxic NP exposure suggested that NP toxicity did not affect the specific growth phase, but did affect lag time. These results indicated that the cells were damaged by the cell disruption that resulted from the adhesion of the NPs to the cell surface. Finally, the cytotoxicity of the toxic, positively charged PSL NPs toward L. lactis was compared with that displayed toward a model gram negative bacterium Escherichia coli and a model eukaryote Saccharomyces cerevisiae. The cytotoxic behaviors of NPs on L. lactis and E. coli were similar, and depended not on the bacterial surface structure, but rather the environmental ionic strength. In contrast, the cytotoxicity of the prokaryote bacteria was higher than that toward the model eukaryote S. cerevisiae. The difference between the NP sensitivities of the prokaryote and eukaryote resulted from the prokaryote’s lack of an endocytotic pathway.
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Acknowledgments
This work was supported by the Japan Society for the Promotion of Science, KAKENHI Grant Number 24310066. The authors thank Ms. K. Okuno and Ms. M. Nishiura for their help with the laboratory work.
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Nomura, T., Kuriyama, Y., Tokumoto, H. et al. Cytotoxicity of functionalized polystyrene latex nanoparticles toward lactic acid bacteria, and comparison with model microbes. J Nanopart Res 17, 105 (2015). https://doi.org/10.1007/s11051-015-2922-8
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DOI: https://doi.org/10.1007/s11051-015-2922-8