Differential toxicity of amorphous silica nanoparticles toward phagocytic and epithelial cells
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The objective of this study was to evaluate the influence of size and surface functionality of amorphous silica nanoparticles (SNPs) on their interaction with cultured cells. The intracellular uptake, phagocytic activity, and possible mechanisms of toxicity induced by SNPs were studied on murine alveolar macrophages and two epithelial cancer cell lines. It was found that phagocytic cells are more susceptible to amorphous SNPs than epithelial cells. SNPs with functionalized surfaces were capable to induce the formation of apoptotic cells to a higher extent than plain particles. Plain SNPs induced plasma membrane damage in phagocytic cells to a higher extent and caused cell death in a shorter period of time than surface-functionalized SNPs. The prevalence of necrotic mode of cell death was observed after treatment with plain SNPs. In the range studied surface functionality played an important role in SNPs toxicity.
KeywordsSilica nanoparticles Nanotoxicology Cellular uptake Epithelial cells Phagocytes Environmental and health effects EHS
We thank Dr. Chris Rodesh and Nancy Chandler from the University of Utah Core Facilities for help with CLSM and TEM imaging, respectively. This work was supported by the National Institutes of Health (R01DE19050), the National Science Foundation (NSF-NIRT-ID 0835342), and by the Utah Science Technology and Research (USTAR) Initiative.
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