Bioaccumulation and toxicity of gold nanoparticles after repeated administration in mice |
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Authors: | C. Lasagna-Reeves M.A. Barria I. Olmedo A. Clos A. Urayama L. Vergara C. Soto |
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Affiliation: | a Department of Neurology, University of Texas Medical Branch, Galveston, TX, USA b Department of Preventative Medicine, University of Texas Medical Branch, Galveston, TX, USA c Mitchell Center for Alzheimer’s Disease and Related Brain Disorders, Department of Neurology, University of Texas Medical School at Houston, Houston, TX 77030, USA d Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile and Centro para la investigación interdisciplinaria avanzada en ciencias de los materiales (CIMAT), Santiago, Chile |
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Abstract: | Gold nanoparticles (GNPs) offer a great promise in biomedicine. Currently, there is no data available regarding the accumulation of nanoparticles in vivo after repeated administration. The purpose of the present study was to evaluate the bioaccumulation and toxic effects of different doses (40, 200, and 400 μg/kg/day) of 12.5 nm GNPs upon intraperitoneal administration in mice every day for 8 days.The gold levels in blood did not increase with the dose administered, whereas in all the organs examined there was a proportional increase on gold, indicating efficient tissue uptake. Although brain was the organ containing the lowest quantity of injected GNPs, our data suggest that GNPs are able to cross the blood-brain barrier and accumulate in the neural tissue. Importantly, no evidence of toxicity was observed in any of the diverse studies performed, including survival, behavior, animal weight, organ morphology, blood biochemistry and tissue histology. The results indicate that tissue accumulation pattern of GNPs depend on the doses administered and the accumulation of the particles does not produce sub-acute physiological damage. |
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Keywords: | NPs, nanoparticles GNPs, gold nanoparticles CNS, central nervous system TEM, transmission electron microscopy ICP-MS, inductively coupled plasma-mass spectrometry GF-AAS, graphite furnace atomic absorption spectrophotometry |
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