Comparison of toxicity between the different-type TiO2 nanowires in vivo and in vitro.
Arch Toxicol
; 87(7): 1219-30, 2013 Jul.
Article
em En
| MEDLINE
| ID: mdl-23389739
ABSTRACT
In this study, we compared their toxicity in vivo and in vitro based on the physicochemical properties of three different types of TiO2 nanowires, H2Ti3O7 nanowires (1HTO), hydrothermal treatment (2HTO), and calcination (3HTO) of 1HTO. The surface of 1HTO was smooth, and the surface of 2HTO was much rougher. The negative charge on the surface increased in the order of 2HTO, 3HTO, and 1HTO, whereas the surface area increased in the order of 3HTO, 1HTO, and 2HTO. The lung is a main exposure route of nanoparticles. On day 28 after a single instillation (1 mg/kg), three nanowires induced a Th2-type inflammatory response together with the relative increase in CD4⺠T cells, especially by 2HTO. In vitro, three TiO2 nanowires (10 µg/ml) commonly induced the generation of cell debris in eight cell lines which may be the potential target organ of nanoparticles, especially by 2HTO. It seemed that the generation of cell debris coincides with the increase in autophagosome-like vacuoles in the cytosol. In further study using BEAS-2B cells originated from the lung, the protein amount from cells exposed to 2HTO decreased more clearly although the generation of reactive oxygen species (ROS) was less compared to 1HTO and 3HTO. Based on these results, we suggest that surface area may act as an important factor depends on the biological response by TiO2 nanowires. Furthermore, the increase in autophagosome-like vacuoles may be an important cause of cell death by nanoparticles with ROS.
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Base de dados:
MEDLINE
Assunto principal:
Pneumonia
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Titânio
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Linfócitos T
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Nanofios
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Pulmão
Limite:
Animals
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Humans
Idioma:
En
Revista:
Arch Toxicol
Ano de publicação:
2013
Tipo de documento:
Article