Journal
NANOTOXICOLOGY
Volume 6, Issue 5, Pages 453-471Publisher
INFORMA HEALTHCARE
DOI: 10.3109/17435390.2011.587900
Keywords
Inflammation; DNA damage; nanoparticles; paints; lacquers
Categories
Funding
- Danish Working Environment Research Fund [20060068816]
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Manufactured nanomaterials are projected to be used on a large scale in paints and lacquers. We selected seven commercially interesting materials: Three titanium dioxide-based (two coated rutile; one uncoated anatase), one carbon black (Flamruss 101), one kaolinite clay, and two silica products, whereas carbon black, Printex 90, was used as reference material. DNA damaging activity and inflammogenicity (pulmonary cell composition and mRNAs) were determined 24 h after intratracheal instillation of a single dose of 54 mu g in mice. Greatest inflammation was induced by Printex 90 and uncoated titanium dioxide. The inflammatory potency correlated with instilled surface area (R-2 = 0.94) but not with material volume (R-2 = 0.17). The coated titanium dioxides induced DNA damage in lung lining fluid cells. The uncoated titanium dioxide was not DNA damaging by the comet assay 24 h after exposure despite being highly inflammogenic. This suggests that inflammation is not a prerequisite to DNA damage in titanium dioxide-based products.
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