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Journal of Environmental Pathology, Toxicology and Oncology
Fator do impacto: 1.241 FI de cinco anos: 1.349 SJR: 0.356 SNIP: 0.613 CiteScore™: 1.61

ISSN Imprimir: 0731-8898
ISSN On-line: 2162-6537

Journal of Environmental Pathology, Toxicology and Oncology

DOI: 10.1615/JEnvironPatholToxicolOncol.2014010179
pages 59-68

Acute and Subacute Pulmonary Toxicity Caused by a Single Intratracheal Instillation of Colloidal Silver Nanoparticles in Mice: Pathobiological Changes and Metallothionein Responses

Theerayuth Kaewamatawong
Department of Veterinary Pathology, Chulalongkorn University, Bangkok, Thailand
Wijit Banlunara
Department of Veterinary Pathology, Chulalongkorn University, Bangkok, Thailand
Pattwat Maneewattanapinyo
Sensor Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
Chuchaat Thammachareon
Sensor Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
Sanong Ekgasit
Sensor Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand

RESUMO

To study the acute and subacute pulmonary toxicity of colloidal silver nanoparticles (Ag-NPs), 0 or 100 ppm of Ag-NPs were instilled intratracheally in mice. Cellular and biochemical parameters in bronchoalveolar lavage fluid (BALF) and histological alterations were determined 1, 3, 7, 15, and 30 days after instillation. Ag-NPs induced moderate pulmonary inflammation and injury on BALF indices during the acute period; however, these changes gradually regressed in a time-dependent manner. Concomitant histopathological and laminin immunohistochemical findings generally correlated to BALF data. Superoxide dismutase and metallothionein expression occurred in particle-laden macrophages and alveolar epithelial cells, which correlated to lung lesions in mice treated with Ag-NPs. These findings suggest that instillation of Ag-NPs causes transient moderate acute lung inflammation and tissue damage. Oxidative stress may underlie the induction of injury to lung tissue. Moreover, the expression of metallothionein in tissues indicated the protective response to exposure to Ag-NPs.


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