Abstract
A major health concern for nanomaterials is their potential toxic effect after inhalation of dusts. Correspondingly, the core element of tier 1 in the currently proposed integrated testing strategy (ITS) is a short-term rat inhalation study (STIS) for this route of exposure. STIS comprises a comprehensive scheme of biological effects and marker determination in order to generate appropriate information on early key elements of pathogenesis, such as inflammatory reactions in the lung and indications of effects in other organs. Within the STIS information on the persistence, progression and/or regression of effects is obtained. The STIS also addresses organ burden in the lung and potential translocation to other tissues. Up to now, STIS was performed in research projects and routine testing of nanomaterials. Meanwhile, rat STIS results for more than 20 nanomaterials are available including the representative nanomaterials listed by the Organization for Economic Cooperation and Development (OECD) working party on manufactured nanomaterials (WPMN), which has endorsed a list of representative manufactured nanomaterials (MN) as well as a set of relevant endpoints to be addressed. Here, results of STIS carried out with different nanomaterials are discussed as case studies. The ranking of different nanomaterials potential to induce adverse effects and the ranking of the respective NOAEC are the same among the STIS and the corresponding subchronic and chronic studies. In another case study, a translocation of a coated silica nanomaterial was judged critical for its safety assessment. Thus, STIS enables application of the proposed ITS, as long as reliable and relevant in vitro methods for the tier 1 testing are still missing. Compared to traditional subacute and subchronic inhalation testing (according to OECD test guidelines 412 and 413), STIS uses less animals and resources and offers additional information on organ burden and progression or regression of potential effects.
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Acknowledgments
Parts of the work presented here were performed within the German nanoCare (BMBF) project and the European NanoSafe2 (FP6) project. This paper was initiated by the OECD Working Party on Manufactured Nanomaterials SG7: The Role of Alternative Methods in Nano Toxicology.
Conflict of interest
Some of the authors are employees of BASF SE, a company producing and marketing nanomaterials. BASF has sponsored parts of this work.
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This article is published as a part of the Special Issue “Nanotoxicology II” on the ECETOC Satellite workshop, Dresden 2010 (Innovation through Nanotechnology and Nanomaterials + Current Aspects of Safety Assessment and Regulation.
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Klein, C.L., Wiench, K., Wiemann, M. et al. Hazard identification of inhaled nanomaterials: making use of short-term inhalation studies. Arch Toxicol 86, 1137–1151 (2012). https://doi.org/10.1007/s00204-012-0834-2
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DOI: https://doi.org/10.1007/s00204-012-0834-2