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Overproduction of free radicals contributes to oxidative stress and inflammation leading to various disease conditions. Cerium oxide nanoparticles (nanoceria) have been shown to scavenge free radicals and have the potential for being used as a therapeutic agent in disease conditions. Therefore, in the present study, human monocytic leukemia cells (THP-1) were used as a model to evaluate the uptake and free radical scavenging activity of nanoceria. Our data showed a significant ( P &lt;0.05) increase in the internalization of nanoceria in a concentration-dependent (10-100 µg/mL) manner in THP-1 cells. Although no cytotoxicity was observed at these concentrations, nanoceria significantly ( P &lt;0.05) reduced the amount of reactive oxygen species. This was evident by a significant ( P &lt;0.05) decrease in the 2,7-dichlorofluorescein diacetate fluorescence observed in flow cytometry and fluorescence microscopy. The present study shows that nanoceria have therapeutic potential in diseases such as cancer.

Cellular internalization and antioxidant activity of cerium oxide nanoparticles in human monocytic leukemia cells