Murine pulmonary responses after sub-chronic exposure to aluminum oxide-based nanowhiskers
<p>Abstract</p> <p>Background</p> <p>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 aspec...
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| Format: | Article |
| Language: | English |
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BMC
2012-06-01
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| Series: | Particle and Fibre Toxicology |
| Subjects: | |
| Online Access: | http://www.particleandfibretoxicology.com/content/9/1/22 |
| _version_ | 1811250680769282048 |
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| author | Adamcakova-Dodd Andrea Stebounova Larissa V O’Shaughnessy Patrick T Kim Jong Grassian Vicki H Thorne Peter S |
| author_facet | Adamcakova-Dodd Andrea Stebounova Larissa V O’Shaughnessy Patrick T Kim Jong Grassian Vicki H Thorne Peter S |
| author_sort | Adamcakova-Dodd Andrea |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Background</p> <p>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 <it>in vivo</it> toxicity of inhaled AO nanowhisker aerosols.</p> <p>Methods</p> <p>Primary dimensions of AO nanowhiskers specified by manufacturer were 2–4 nm x 2800 nm. The aluminum content found in this nanomaterial was 30% [mixed phase material containing Al(OH)<sub>3</sub> 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 ± 0.6 mg/m<sup>3</sup> and the mobility diameter was 150 ± 1.6 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.</p> <p>Results</p> <p>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 (<it>p</it> < 0.01, <it>p</it> < 0.001, 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.</p> <p>Conclusions</p> <p>Sub-chronic inhalation exposures to aluminum-oxide based nanowhiskers induced increased lung macrophages, but no inflammatory or toxic responses were observed.</p> |
| first_indexed | 2024-04-12T16:08:18Z |
| format | Article |
| id | doaj.art-a88c6b4f372847e49ad0f7976369fa1e |
| institution | Directory Open Access Journal |
| issn | 1743-8977 |
| language | English |
| last_indexed | 2024-04-12T16:08:18Z |
| publishDate | 2012-06-01 |
| publisher | BMC |
| record_format | Article |
| series | Particle and Fibre Toxicology |
| spelling | doaj.art-a88c6b4f372847e49ad0f7976369fa1e2022-12-22T03:26:00ZengBMCParticle and Fibre Toxicology1743-89772012-06-01912210.1186/1743-8977-9-22Murine pulmonary responses after sub-chronic exposure to aluminum oxide-based nanowhiskersAdamcakova-Dodd AndreaStebounova Larissa VO’Shaughnessy Patrick TKim JongGrassian Vicki HThorne Peter S<p>Abstract</p> <p>Background</p> <p>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 <it>in vivo</it> toxicity of inhaled AO nanowhisker aerosols.</p> <p>Methods</p> <p>Primary dimensions of AO nanowhiskers specified by manufacturer were 2–4 nm x 2800 nm. The aluminum content found in this nanomaterial was 30% [mixed phase material containing Al(OH)<sub>3</sub> 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 ± 0.6 mg/m<sup>3</sup> and the mobility diameter was 150 ± 1.6 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.</p> <p>Results</p> <p>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 (<it>p</it> < 0.01, <it>p</it> < 0.001, 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.</p> <p>Conclusions</p> <p>Sub-chronic inhalation exposures to aluminum-oxide based nanowhiskers induced increased lung macrophages, but no inflammatory or toxic responses were observed.</p>http://www.particleandfibretoxicology.com/content/9/1/22AluminumNanowhiskersHigh aspect ratio nanomaterialInhalationMurine modelPulmonary responseToxicity |
| spellingShingle | Adamcakova-Dodd Andrea Stebounova Larissa V O’Shaughnessy Patrick T Kim Jong Grassian Vicki H Thorne Peter S Murine pulmonary responses after sub-chronic exposure to aluminum oxide-based nanowhiskers Particle and Fibre Toxicology Aluminum Nanowhiskers High aspect ratio nanomaterial Inhalation Murine model Pulmonary response Toxicity |
| title | Murine pulmonary responses after sub-chronic exposure to aluminum oxide-based nanowhiskers |
| title_full | Murine pulmonary responses after sub-chronic exposure to aluminum oxide-based nanowhiskers |
| title_fullStr | Murine pulmonary responses after sub-chronic exposure to aluminum oxide-based nanowhiskers |
| title_full_unstemmed | Murine pulmonary responses after sub-chronic exposure to aluminum oxide-based nanowhiskers |
| title_short | Murine pulmonary responses after sub-chronic exposure to aluminum oxide-based nanowhiskers |
| title_sort | murine pulmonary responses after sub chronic exposure to aluminum oxide based nanowhiskers |
| topic | Aluminum Nanowhiskers High aspect ratio nanomaterial Inhalation Murine model Pulmonary response Toxicity |
| url | http://www.particleandfibretoxicology.com/content/9/1/22 |
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