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ToxSci Advance Access published online on September 21, 2005
Toxicological Sciences, doi:10.1093/toxsci/kfi339
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© The Author 2005. Published by Oxford University Press on behalf of the Society of Toxicology. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received July 28, 2005
Accepted September 20, 2005

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Research Strategies for Safety Evaluation of Nanomaterials, Part IV: Risk Assessment of Nanoparticles (Symposium Summary)

Joyce S. Tsuji 1*, Andrew D. Maynard 2, Paul C. Howard 3, John T. James 4, Chiu Wing Lam 4, David B. Warheit 5, and Annette B. Santamaria 6

1 Exponent, Bellevue, WA 98007
2 Woodrow Wilson International Center for Scholars, Washington, DC 20004-3027
3 National Center for Toxicological Research and National Toxicology Program Center for Phototoxicology, U.S. Food & Drug Administration, Jefferson, AR 72079
4 National Aeronautics and Space Administration, Houston, TX, 77058
5 DuPont Haskell Laboratory, Newark, DE 19714
6 Environ International, Houston, TX 77002

* To whom correspondence should be addressed.
Joyce S. Tsuji, E-mail: tsujij{at}exponent.com


  Abstract

Nanoparticles are small-scale substances (<100 nm) with unique properties and thus complex exposure and health risk implications. This symposium review summarizes recent findings in exposure and toxicity of nanoparticles and their application for assessing human health risks. Characterization of airborne particles indicates that exposures will depend on particle behavior (e.g., disperse or aggregate) and that accurate, portable, and cost-effective measurement techniques are essential for understanding exposure. Under many conditions, dermal penetration of nanoparticles may be limited for consumer products such as sunscreens, although additional studies are needed on potential photo-oxidation products, experimental methods, and the effect of skin condition on penetration. Carbon nanotubes apparently have greater pulmonary toxicity (inflammation, granuloma) in mice than fine-scale carbon graphite and their metal content may affect toxicity. Studies on TiO2 and quartz illustrate the complex relationship between toxicity and particle characteristics, including surface coatings, which make generalizations (e.g., smaller particles are always more toxic) incorrect for some substances. These recent toxicity and exposure data combined with therapeutic and other related literature are beginning to shape risk assessments that will be used to regulate the use of nanomaterials in consumer products.

Keywords: nanotechnology; nanoparticles; risk assessment; exposure assessment.

DISCLAIMER: The opinions and comments in this manuscript do not reflect the views of any U.S. Government Agency nor do they reflect policy, regulatory positions, nor any possible changes in regulatory positions. The views expressed in this manuscript are those of the authors. The mention of any product should not be considered an endorsement.


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