Effect of Zirconium Dioxide Nanoparticles on Glutathione Peroxidase Enzyme in PC12 and N2a Cell Lines

Document Type: Research article

Authors

1 Department of Pharmacology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, IRAN

2 Department of Pharmacology and Neurocognitive Research Center, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, IRAN

3 Pharmacological Research Center of Medicinal Plants, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, IRAN

4 Pharmacological Research Center of Medicinal Plants and Department of Pharmacology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, IRAN

Abstract

Objective:
Today, special attention is paid to the use of zirconium dioxide nanoparticle (nano-ZrO2), a neutral bioceramic metal, particularly for drug and gene delivery in medicine. However, there are some reports implying that use of nano-ZrO2 is associated with cytotoxic effects like inhibiting the cell proliferation, DNA damage and apoptosis. In the present study, we examined whether nano-ZrO2 alters cell viability and glutathione peroxidase (GPx) activity in two neuronal cell lines.
Materials and Methods:
The PC12 and N2a cells were cultured in the absence or presence of varying concentrations (31.25-2000 µg/ml) of nano-ZrO2 for 12, 24 or 48 h. The cell viability was evaluated using 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium (MTS) assay and GPx activity was determined by quantifying the rate of oxidation of the reduced glutathione to the oxidized glutathione.
Results:
Nano-ZrO2 caused a significant reduction in cell viability and GPx activity after 12, 24 and 48h, as compared with control group. These effects were concentration dependent and started from 250µg/ml.
Conclusion: The present study demonstrated that nano-ZrO2, at concentrations of > 250 µg/ml, has antiproliferative effects via reducing the cell defense mechanism against oxidative stress.

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