Medizinische Universität Graz - Research portal
Selected Publication:
SHR Neuro Cancer Cardio Lipid Metab Microb
Frohlich, E; Meindl, C; Roblegg, E; Ebner, B; Absenger, M; Pieber, TR; .
Action of polystyrene nanoparticles of different sizes on lysosomal function and integrity.
Part Fibre Toxicol. 2012; 9(16):26-26
Doi: 10.1186/1743-8977-9-26
[OPEN ACCESS]
Web of Science
PubMed
FullText
FullText_MUG
- Leading authors Med Uni Graz
- Fröhlich Eleonore
- Co-authors Med Uni Graz
- Absenger-Novak Markus
- Gallé Birgit
- Meindl Claudia
- Pieber Thomas
- Altmetrics:
- Dimensions Citations:
- Plum Analytics:
- Scite (citation analytics):
- Abstract:
- Background: Data from environmental exposure to nanoparticles (NPs) suggest that chronic exposure may increase the incidence of lung, cardiovascular and neurodegenerative diseases. Impairment of cell function by intracellular accumulation of NPs is also suspected. Many types of NPs have been detected in the endosomal-lysosomal system and, upon repeated exposure, alterations of the endosomal-lysosomal system may occur. To identify such effects we compared the effect of carboxyl polystyrene particles (CPS) of different sizes (20-500 nm) on lysosomes of the endothelial cell line EAhy926 after short (24h) and long (72h-96h) exposure times. Lysosomal localization of CPS, as well as lysosomal pH, lysosomal membrane integrity, morphology of the endosomal-lysosomal system and activities of the lysosomal enzymes, cathepsin B and sulfatases, upon exposure to CPS were recorded. Results: CPS in sizes <= 100 nm showed high co-localization with lysosomes already after 4h, larger CPS after 24h. None of the particles at non-cytotoxic concentrations caused marked changes in lysosomal pH or destroyed lysosomal membrane integrity. At 24h of exposure, 20 nm CPS induced significant dilatation of the endosomal-lysosomal system and reduced activity of lysosomal sulfatases. After 72h, these alterations were less pronounced. Conclusions: Despite accumulation in lysosomes CPS induced only small changes in lysosomes. Upon longer contact, these changes are even less pronounced. The presented panel of assays may serve to identify effects on lysosomes also for other NPs.
- Find related publications in this database (using NLM MeSH Indexing)
- Cathepsin B - metabolism
- Cell Line -
- Cell Survival - drug effects
- Endothelial Cells - drug effects
- Humans -
- Hydrogen-Ion Concentration -
- Intracellular Membranes - drug effects Intracellular Membranes - ultrastructure
- Lysosomes - drug effects Lysosomes - metabolism Lysosomes - ultrastructure
- Nanoparticles - chemistry Nanoparticles - toxicity
- Oxidative Stress - drug effects
- Particle Size -
- Polystyrenes - chemistry Polystyrenes - toxicity
- Time Factors -
- Find related publications in this database (Keywords)
- Nanoparticles
- Lysosomes
- Cathepsin B
- Lysosomal sulfatase
- Accumulation