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Skalska J, Frontczak-Baniewicz M, Strużyńska L. Synaptic degeneration in rat brain after prolonged oral exposure to silver nanoparticles. Neurotoxicology 2014; 46:145-54. [PMID: 25447321 DOI: 10.1016/j.neuro.2014.11.002] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Revised: 09/11/2014] [Accepted: 11/07/2014] [Indexed: 01/28/2023]
Abstract
Neurotoxicity of silver nanoparticles has been confirmed in both in vitro and in vivo studies. However, the mechanisms of the toxic action have not been fully clarified. Since nanoparticles are likely to have the ability to enter the brain and significantly accumulate in this organ, it is important to investigate their neurotoxic mechanisms. Here we examine the effect of prolonged exposure of rats to small (10nm) citrate-stabilized silver nanoparticles (as opposed to the ionic silver) on synapse ultrastructure and specific proteins. Administration of both nanosilver and ionic silver over a two-week period resulted in ultrastructural changes including blurred synapse structure and strongly enhanced density of synaptic vesicles clustering in the center of the presynaptic part. Disturbed synaptic membrane leading to liberation of synaptic vesicles into neuropil, which testifies for strong synaptic degeneration, was characteristic feature observed under AgNPs exposure. Also a noteworthy finding was the presence of myelin-like structures derived from fragmented membranes and organelles which are associated with neurodegenerative processes. Additionally, we observed significantly decreased levels of the presynaptic proteins synapsin I and synaptophysin, as well as PSD-95 protein which is an indicator of postsynaptic densities. The present study demonstrates that exposure of adult rats to both forms of silver leads to ultrastructural changes in synapses. However, it seems that small AgNPs lead to more severe synaptic degeneration, mainly in the hippocampal region of brain. The observations may indicate impairment of nerve function and, in the case of hippocampus, may predict impairment of cognitive processes.
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Affiliation(s)
- Joanna Skalska
- Laboratory of Pathoneurochemistry, Department of Neurochemistry, Mossakowski Medical Research Centre, Polish Academy of Sciences, 5 Pawińskiego Str., 02-106 Warsaw, Poland
| | - Małgorzata Frontczak-Baniewicz
- Electron Microscopy Platform, Mossakowski Medical Research Centre, Polish Academy of Sciences, 5 Pawińskiego Str., 02-106 Warsaw, Poland
| | - Lidia Strużyńska
- Laboratory of Pathoneurochemistry, Department of Neurochemistry, Mossakowski Medical Research Centre, Polish Academy of Sciences, 5 Pawińskiego Str., 02-106 Warsaw, Poland.
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Privalova LI, Katsnelson BA, Loginova NV, Gurvich VB, Shur VY, Valamina IE, Makeyev OH, Sutunkova MP, Minigalieva IA, Kireyeva EP, Rusakov VO, Tyurnina AE, Kozin RV, Meshtcheryakova EY, Korotkov AV, Shuman EA, Zvereva AE, Kostykova SV. Subchronic toxicity of copper oxide nanoparticles and its attenuation with the help of a combination of bioprotectors. Int J Mol Sci 2014; 15:12379-406. [PMID: 25026171 PMCID: PMC4139849 DOI: 10.3390/ijms150712379] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Revised: 06/12/2014] [Accepted: 06/19/2014] [Indexed: 12/27/2022] Open
Abstract
In the copper metallurgy workplace air is polluted with condensation aerosols, which a significant fraction of is presented by copper oxide particles<100 nm. In the scientific literature, there is a lack of their in vivo toxicity characterization and virtually no attempts of enhancing organism's resistance to their impact. A stable suspension of copper oxide particles with mean (±SD) diameter 20±10 nm was prepared by laser ablation of pure copper in water. It was being injected intraperitoneally to rats at a dose of 10 mg/kg (0.5 mg per mL of deionized water) three times a week up to 19 injections. In parallel, another group of rats was so injected with the same suspension against the background of oral administration of a "bio-protective complex" (BPC) comprising pectin, a multivitamin-multimineral preparation, some amino acids and fish oil rich in ω-3 PUFA. After the termination of injections, many functional and biochemical indices for the organism's status, as well as pathological changes of liver, spleen, kidneys, and brain microscopic structure were evaluated for signs of toxicity. In the same organs we have measured accumulation of copper while their cells were used for performing the Random Amplification of Polymorphic DNA (RAPD) test for DNA fragmentation. The same features were assessed in control rats infected intraperitoneally with water with or without administration of the BPC. The copper oxide nanoparticles proved adversely bio-active in all respects considered in this study, their active in vivo solubilization in biological fluids playing presumably an important role in both toxicokinetics and toxicodynamics. The BPC proposed and tested by us attenuated systemic and target organs toxicity, as well as genotoxicity of this substance. Judging by experimental data obtained in this investigation, occupational exposures to nano-scale copper oxide particles can present a significant health risk while the further search for its management with the help of innocuous bioprotectors seems to be justified.
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Affiliation(s)
- Larisa I Privalova
- The Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 30 Popov Str., Ekaterinburg 630014, Russia.
| | - Boris A Katsnelson
- The Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 30 Popov Str., Ekaterinburg 630014, Russia.
| | - Nadezhda V Loginova
- The Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 30 Popov Str., Ekaterinburg 630014, Russia.
| | - Vladimir B Gurvich
- The Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 30 Popov Str., Ekaterinburg 630014, Russia.
| | - Vladimir Y Shur
- The Institute of Natural Sciences, the Ural Federal University, Ekaterinburg 630000, Russia.
| | - Irene E Valamina
- Central Research Laboratory, the Ural State Medical University, 17 Klyuchevskaya Str., Ekaterinburg 630109, Russia.
| | - Oleg H Makeyev
- Central Research Laboratory, the Ural State Medical University, 17 Klyuchevskaya Str., Ekaterinburg 630109, Russia.
| | - Marina P Sutunkova
- The Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 30 Popov Str., Ekaterinburg 630014, Russia.
| | - Ilzira A Minigalieva
- The Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 30 Popov Str., Ekaterinburg 630014, Russia.
| | - Ekaterina P Kireyeva
- The Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 30 Popov Str., Ekaterinburg 630014, Russia.
| | - Vadim O Rusakov
- The Medical Research Center for Prophylaxis and Health Protection in Industrial Workers, 30 Popov Str., Ekaterinburg 630014, Russia.
| | - Anastasia E Tyurnina
- The Institute of Natural Sciences, the Ural Federal University, Ekaterinburg 630000, Russia.
| | - Roman V Kozin
- The Institute of Natural Sciences, the Ural Federal University, Ekaterinburg 630000, Russia.
| | - Ekaterina Y Meshtcheryakova
- Central Research Laboratory, the Ural State Medical University, 17 Klyuchevskaya Str., Ekaterinburg 630109, Russia.
| | - Artem V Korotkov
- Central Research Laboratory, the Ural State Medical University, 17 Klyuchevskaya Str., Ekaterinburg 630109, Russia.
| | - Eugene A Shuman
- Central Research Laboratory, the Ural State Medical University, 17 Klyuchevskaya Str., Ekaterinburg 630109, Russia.
| | - Anastasia E Zvereva
- Central Research Laboratory, the Ural State Medical University, 17 Klyuchevskaya Str., Ekaterinburg 630109, Russia.
| | - Svetlana V Kostykova
- Central Research Laboratory, the Ural State Medical University, 17 Klyuchevskaya Str., Ekaterinburg 630109, Russia.
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Peynshaert K, Manshian BB, Joris F, Braeckmans K, De Smedt SC, Demeester J, Soenen SJ. Exploiting Intrinsic Nanoparticle Toxicity: The Pros and Cons of Nanoparticle-Induced Autophagy in Biomedical Research. Chem Rev 2014; 114:7581-609. [DOI: 10.1021/cr400372p] [Citation(s) in RCA: 195] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
| | - Bella B. Manshian
- Biomedical
MRI Unit/MoSAIC, Department of Imaging and Pathology, Faculty of Medicine, Catholic University of Leuven, B3000 Leuven, Belgium
| | | | | | | | | | - Stefaan J. Soenen
- Biomedical
MRI Unit/MoSAIC, Department of Imaging and Pathology, Faculty of Medicine, Catholic University of Leuven, B3000 Leuven, Belgium
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