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Chemical functionalization of multiwalled carbon nanotubes (MWCNTs) increases their solubility, dispersion, and biological applications. Since there are only a few studies on the toxicity of functionalized MWCNTs, we investigated the cytotoxic and genotoxic-oxidative effects of OH-functionalized MWCNTs on human lung epithelial cells (A549) in order to obtain information on their biological effects. We exposed the cells to 10, 20, 40, and 100 μg/mL of commercial MWCNT-OH for 24 h. Cytotoxicity was then evaluated as the reduction in cell viability, membrane damage, and apoptosis, assessed by MTT and LDH assays and fluorescence microscopic analysis, respectively. The Fpg-modified comet assay was used to assess direct/oxidative DNA damage. We found a concentration-dependent reduction in cell viability and an increase of percentage of apoptotic cells, with no significant cellular LDH release. There was also concentration-dependent direct DNA damage but no oxidative DNA damage. These findings demonstrate the cytotoxicity of MWCNT-OH, through reduction of cell viability and induction of apoptosis without cell membrane damage, and  the genotoxicity, by direct DNA damage induction, suggesting that the MWCNTs enter the cell without damaging its membrane and directly interact with the nucleus. This preliminary study highlights the need for further research to examine the potential toxicity of functionalized MWCNTs before starting to use them in biological applications

Study of Cytotoxic and Genotoxic Effects of Hydroxyl-Functionalized Multiwalled Carbon Nanotubes on Human Pulmonary Cells