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Assessment of the cytotoxicity of cerium, tin, aluminum, and zinc oxide nanoparticles on human cells

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Abstract

In the course of time, there has been an increased usage of commercial products containing nanoparticles formulated from tin oxide (TNPs), cerium oxide (CNPs), aluminum oxide (ANPs), and zinc oxide (ZNPs). Despite the wide use of metal oxide nanoparticles (MONPs), understanding about their toxicity and mechanism of action are still unclear. In the present study, TNPs, CNPs, ANPs, and ZNPs were produced by the method of chemical synthesis and characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), and Fourier transform infrared (FTIR) spectroscopy. The effect of these MONPs on human red blood cells (RBCs) and human skin cells (HaCaT) was investigated. In skin cells, these MONPs showed concentration-dependent cytotoxicity. ZNPs downregulated the glutathione and upregulated lipid peroxidation and lactate dehydrogenase activity which correlates with the increased reactive oxygen production in cells. Genotoxic effect of ZNPs was measured by comet tail assay that showed increased DNA damage in skin cells. Upregulation of Hsp70, Grp 78, and CYP1A1 was observed following ZNPs and ANPs treatment with skin cells. In the case of CNPs and TNPs, the changes were not significant. This study demonstrates the toxic effects of ZNPs and ANPs on skin cells, suggesting caution must be exercised in their use  which may be restricted in the cosmetics industry and also products related to human use.

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Acknowledgments

The authors are thankful to Chettinad Hospital & Research Institute (CHRI), Chettinad Academy of Research and Education (CARE), for providing the research facilities.

Funding

The authors are thankful to Chettinad Hospital & Research Institute (CHRI), Chettinad Academy of Research and Education (CARE), for providing the research funding.

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Contributions

SV conducted the experiments and wrote the drafts of the manuscript. RM and SP conceived the study and participated in its design and coordination and also helped to analyze the results and to draft the manuscript. All authors reviewed the manuscript.

Corresponding author

Correspondence to Surajit Pathak.

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The authors declare that they have no conflicts of interest.

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All approval related to study was obtained from Chettinad Academy of Research and Education. For study on human cell lines, no human ethical clearance was required.

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Supplementary File 1

Comet assay images: (a) untreated cells exhibited intact DNA without tail (b) cells exhibiting increased DNA migration after treatment with ZNPs for 48 h. (PNG 16 kb)

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Subramaniam, V.D., Murugesan, R. & Pathak, S. Assessment of the cytotoxicity of cerium, tin, aluminum, and zinc oxide nanoparticles on human cells. J Nanopart Res 22, 373 (2020). https://doi.org/10.1007/s11051-020-05102-3

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  • DOI: https://doi.org/10.1007/s11051-020-05102-3

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