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Uptake and intracellular localization of submicron and nano-sized SiO2 particles in HeLa cells

  • Inorganic Compounds
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Abstract

Engineered amorphous silica nanoparticles (SiO2-NPs) are widely used in dyes, varnishes, plastics and glue, as well as in pharmaceuticals, cosmetics and food. Novel composite SiO2-NPs are promising multifunctional devices and combine labels for subsequent tracking and are functionalized e.g. to specifically target cells to deliver their cargo. However, biological and potential toxic effects of SiO2-NPs are insufficiently understood. The aim of this study was to determine the uptake and fate of SiO2-NPs in mammalian cells. Also, silica submicron particles (SiO2-SMPs) were included in the studies in order to identify effects, which are only observed for nano-sized SiO2 particles. Fluorescently labelled SiO2-NPs (nominal size 70 nm) and SiO2-SMPs (nominal size 200 and 500 nm) were used to examine cytotoxicity, cellular uptake and localization in human cervical carcinoma cells (HeLa). Particle uptake and intracellular localization in mitochondria, endosomes, lysosomes and nuclei were studied by wide field and confocal laser scanning fluorescence microscopy. Physicochemical characterization of SiO2-NPs by transmission electron microscopy and dynamic light scattering revealed a spherical morphology and a monodisperse size distribution. In the presence of serum, all SiO2 particles are non-toxic. However, in the absence of serum SiO2-NPs but not SiO2-SMPs are highly toxic. SiO2 particles, irrespective of size, were detected in the cytosol and accumulated in endosomal compartments of HeLa cells. No accumulation of SiO2 particles in nuclei or mitochondria of HeLa cells could be observed. In contrast to SiO2-SMPs, SiO2-NPs are preferentially localized in lysosomes.

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Acknowledgments

We thank Markus Schön (Institute for Technical Chemistry, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany) for his support with DLS measurements.

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  1. Karlsruhe Institute of Technology (KIT), Institute of Toxicology and Genetics, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany

    Marco Al-Rawi, Silvia Diabaté & Carsten Weiss

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  1. Marco Al-Rawi
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  2. Silvia Diabaté
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  3. Carsten Weiss
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Correspondence to Carsten Weiss.

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Al-Rawi, M., Diabaté, S. & Weiss, C. Uptake and intracellular localization of submicron and nano-sized SiO2 particles in HeLa cells. Arch Toxicol 85, 813–826 (2011). https://doi.org/10.1007/s00204-010-0642-5

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