Murine pulmonary responses after sub-chronic exposure to aluminum oxide-based nanowhiskers

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Murine pulmonary responses after sub-chronic exposure to aluminum oxide-based nanowhiskers

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作者：Andrea Adamcakova-Dodd (1)
Larissa V Stebounova (2)
Patrick T O’Shaughnessy (1)
Jong Sung Kim (3)
Vicki H Grassian (2) (3)
Peter S Thorne (1) (3)
关键词：Aluminum ; Nanowhiskers ; High aspect ratio nanomaterial ; Inhalation ; Murine model ; Pulmonary response ; Toxicity
刊名：Particle and Fibre Toxicology
出版年：2012
出版时间：December 2012
年：2012
卷：9
期：1
全文大小：887KB
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作者单位：Andrea Adamcakova-Dodd (1)
Larissa V Stebounova (2)
Patrick T O’Shaughnessy (1)
Jong Sung Kim (3)
Vicki H Grassian (2) (3)
Peter S Thorne (1) (3)

1. Department of Occupational and Environmental Health, University of Iowa, Iowa City, IA, 52242, USA
2. Department of Chemistry, University of Iowa, Iowa City, IA, 52242, USA
3. Interdisciplinary Graduate Program in Human Toxicology, University of Iowa, Iowa City, IA, 52242, USA

文摘

Background Aluminum oxide-based nanowhiskers (AO nanowhiskers) have been used in manufacturing processes as catalyst supports, flame retardants, adsorbents, or in ceramic, metal and plastic composite materials. They are classified as high aspect ratio nanomaterials. Our aim was to assess in vivo toxicity of inhaled AO nanowhisker aerosols. Methods Primary dimensions of AO nanowhiskers specified by manufacturer were 2-?nm x 2800?nm. The aluminum content found in this nanomaterial was 30% [mixed phase material containing Al(OH)3sub> and AlOOH]. Male mice (C57Bl/6?J) were exposed to AO nanowhiskers for 4?hrs/day, 5?days/wk for 2 or 4 wks in a dynamic whole body exposure chamber. The whiskers were aerosolized with an acoustical dry aerosol generator that included a grounded metal elutriator and a venturi aspirator to enhance deagglomeration. Average concentration of aerosol in the chamber was 3.3?±-.6?mg/m3 and the mobility diameter was 150?±-.6?nm. Both groups of mice (2 or 4 wks exposure) were necropsied immediately after the last exposure. Aluminum content in the lung, heart, liver, and spleen was determined. Pulmonary toxicity assessment was performed by evaluation of bronchoalveolar lavage (BAL) fluid (enumeration of total and differential cells, total protein, activity of lactate dehydrogenase [LDH] and cytokines), blood (total and differential cell counts), lung histopathology and pulmonary mechanics. Results Following exposure, mean Al content of lungs was 0.25, 8.10 and 15.37?μg/g lung (dry wt) respectively for sham, 2 wk and 4 wk exposure groups. The number of total cells and macrophages in BAL fluid was 2-times higher in animals exposed for 2 wks and 6-times higher in mice exposed for 4 wks, compared to shams (p-lt;-.01, p-lt;-.001, respectively). However no neutrophilic inflammation in BAL fluid was found and neutrophils were below 1% in all groups. No significant differences were found in total protein, activity of LDH, or cytokines levels (IL-6, IFN-γ, MIP-1α, TNF-α, and MIP-2) between shams and exposed mice. Conclusions Sub-chronic inhalation exposures to aluminum-oxide based nanowhiskers induced increased lung macrophages, but no inflammatory or toxic responses were observed.

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