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KMID : 1034820110070040381
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Molecular & Cellular Toxicology
2011 Volume.7 No. 4 p.381 ~ p.388
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Neurotoxic effects by silica TM nanoparticle is independent of differentiation of SH-SY5Y cells
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Kim Youn-Jung
Yang Sung-Ik
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Abstract
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Silica nanoparticles are being formulated for potential drug delivery and for imaging and diagnostic applications in the central nervous system (CNS). However, the potential and underlying mechanism of silica nanoparticles-mediated neurotoxicity has remained unclear. We examined the effect of colloidal silica nanoparticle (LUDOX® TM) on neurite outgrowth and neurotoxicity of human SH-SY5Y neuroblastoma cells differentiated by all-trans-retinoic acid (RA). Exposure of >300 ppm of SiO2 TM nanoparticle in differentiating cells showed less cytotoxicity than in undifferentiated cells. 100 ppm of SiO2 TM nanoparticle had no significant difference on the viability of either undifferentiated or differentiating SH-SY5Y cells. Neurite outgrowth in differentiating cells for 48 h exposure of 100 ppm SiO2 TM nanoparticle was not significantly changed. Thus, SiO2 TM nanoparticle appeared no effects in the early initiation of neurites. And also, although the production of reactive oxygen species (ROS) was not induced, neurotoxicity resulted by SiO2 TM nanoparticle may be the result of increased DNA damage, apoptosis, and cell cycle arrest in undifferentiated and differentiating cells. Further studies are needed to investigate the expression of genes in these signaling pathways in response to exposure to silica nanoparticle and to investigate the molecular mechanisms of neuronal cell effects.
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KEYWORD
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Silica nanoparticle, Differentiation, Neurotoxicity, Apoptosis, Comet assay, Cell cycle arrest
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