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Cytotoxicity and cell death induced by engineered nanostructures (quantum dots and nanoparticles) in human cell lines

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Abstract

In recent years, the industrial use of ZnO quantum dots (QDs) and nanoparticles (NPs) has risen and there is a high chance of these nanoparticles affecting human health. In this study, different sizes of ZnO-NPs (6–100 nm) were prepared and characterized. The generation of reactive oxygen species (ROS) and its involvement in apoptosis when HepG2 cells were exposed to QDs (6 nm) and NPs of different sizes (15–20, 50, and 100 nm) was also investigated. At a concentration of 25–200 μg/mL, NPs induced dose-dependent cytotoxicity in HepG2 cells. The engineered NPs increased oxidative stress in a dose- and size-dependent manner, as seen by an increase in ROS production, lipid peroxidation, and glutathione reduction. Furthermore, cell-cycle analysis of HepG2 cells treated with different sizes of NPs showed an increase in the apoptotic peak after a 24-h exposure period. Quantitative real-time PCR data showed that the mRNA levels of apoptotic marker genes such as p53, bax, and caspase-3 were upregulated, whereas bcl-2, an anti-apoptotic gene, was downregulated; therefore, apoptosis was mediated through the p53, bax, caspase-3, and bcl-2 pathways, suggesting a possible mechanism by which QDs and NPs of ZnO mediate their toxicity.

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Acknowledgements

The authors are grateful to the Deanship of Scientific Research, King Saud University for funding through Vice Deanship of Scientific Research Chairs.

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Authors and Affiliations

  1. Zoology Department, College of Sciences, King Saud University, Riyadh, 11451, Saudi Arabia

    Javed Ahmad, Rizwan Wahab, Maqsood A. Siddiqui, Quaiser Saquib & Abdulaziz A. Al-Khedhairy

  2. Al-Jeraisy, Chair for DNA Research, King Saud University, Riyadh, 11451, Saudi Arabia

    Javed Ahmad, Rizwan Wahab, Maqsood A. Siddiqui & Quaiser Saquib

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  1. Javed Ahmad
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  2. Rizwan Wahab
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Ahmad, J., Wahab, R., Siddiqui, M.A. et al. Cytotoxicity and cell death induced by engineered nanostructures (quantum dots and nanoparticles) in human cell lines. J Biol Inorg Chem 25, 325–338 (2020). https://doi.org/10.1007/s00775-020-01764-5

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  • DOI: https://doi.org/10.1007/s00775-020-01764-5

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