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Undetactable levels of genotoxicity of SiO2 nanoparticles in in vitro and in vivo tests

Authors Kwon JY, Kim HL, Lee JY, Ju YH, Kim JS, Kang SH, Kim YR, Lee JK, Jeong J, Kim MK, Maeng EH, Seo YR

Received 20 November 2013

Accepted for publication 7 February 2014

Published 15 December 2014 Volume 2014:9(Supplement 2) Pages 173—181

DOI https://doi.org/10.2147/IJN.S57933

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 6

Jee Young Kwon,1,* Hye Lim Kim,1,* Jong Yun Lee,2 Yo Han Ju,2 Ji Soo Kim,2 Seung Hun Kang,1 Yu-Ri Kim,3 Jong-Kwon Lee,4 Jayoung Jeong,4 Meyoung-Kon Kim,3 Eun Ho Maeng,2 Young Rok Seo1

1Department of Life Science, Institute of Environmental Medicine, Dongguk University, Seoul, 2Korea Testing and Research Institute, 3Department of Biochemistry and Molecular Biology, Korea University College of Medicine, Seoul, 4Toxicological Research Division, National Institute of Food and Drug Safety Evaluation, Ministry of Food and Drug Safety, Chungcheongbuk-do, Republic of Korea

*These authors contributed equally to this work and should be considered co-first authors


Background: Silica dioxide (SiO2) has been used in various industrial products, including paints and coatings, plastics, synthetic rubbers, and adhesives. Several studies have investigated the genotoxic effects of SiO2; however, the results remain controversial due to variations in the evaluation methods applied in determining its physicochemical properties. Thus, well characterized chemicals and standardized methods are needed for better assessment of the genotoxicity of nanoparticles.
Methods: The genotoxicity of SiO2 was evaluated using two types of well characterized SiO2, ie, 20 nm (-) charge (SiO2EN20(-)) and 100 nm (-) charge (SiO2EN100(-)). Four end point genotoxicity tests, ie, the bacterial mutation assay, in vitro chromosomal aberration test, in vivo comet assay, and in vivo micronucleus test, were conducted following the test guidelines of the Organization for Economic Cooperation and Development (OECD) with application of Good Laboratory Practice.
Results: No statistically significant differences were found in the bacterial mutation assay, in vitro chromosomal aberration test, in vivo comet assay, and in vivo micronucleus test when tested for induction of genotoxicity in both two types of SiO2 nanoparticles.
Conclusion: These results suggest that SiO2 nanoparticles, in particular SiO2EN20(-) and SiO2EN100(-), are not genotoxic in both in vitro and in vivo systems under OECD guidelines. Further, the results were generated in accordance with OECD test guidelines, and Good Laboratory Practice application; it can be accepted as reliable information regarding SiO2-induced genotoxicity.

Keywords: genotoxicity test, Organization for Economic Cooperation and Development test guideline, Good Laboratory Practice, silica dioxide
 
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