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Lysosomal dysfunction caused by cellular accumulation of silica nanoparticles

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Item Type:Article
Title:Lysosomal dysfunction caused by cellular accumulation of silica nanoparticles
Creators Name:Schuetz, I. and Lopez-Hernandez, T. and Gao, Q. and Puchkov, D. and Jabs, S. and Nordmeyer, D. and Schmudde, M. and Ruehl, E. and Graf, C.M. and Haucke, V.
Abstract:Nanoparticles (NPs) are widely used as components of drugs or cosmetics and hold great promise for biomedicine, yet their effects on cell physiology remain poorly understood. Here we demonstrate that clathrin-independent dynamin 2-mediated caveolar uptake of surface-functionalized silica nanoparticles (SiNPs) impairs cell viability due to lysosomal dysfunction. We show that internalized SiNPs accumulate in lysosomes resulting in inhibition of autophagy-mediated protein turnover and impaired degradation of internalized epidermal growth factor, whereas endosomal recycling proceeds unperturbed. This phenotype is caused by perturbed delivery of cargo via autophagosomes and late endosomes to SiNP-filled cathepsin B/L-containing lysosomes rather than elevated lysosomal pH or altered mTOR activity. Given the importance of autophagy and lysosomal protein degradation for cellular proteostasis and clearance of aggregated proteins, these results raise the question of beneficial use of NPs in biomedicine and beyond.
Keywords:Autophagy, Caveolae, Endocytosis, Endosome, Lysosome, Silica Nanoparticles
Source:Journal of Biological Chemistry
Publisher:American Society for Biochemistry and Molecular Biology
Page Range:14170-14184
Date:1 July 2016
Official Publication:https://doi.org/10.1074/jbc.M115.710947
PubMed:View item in PubMed

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