RGDC Functionalized Titanium
Dioxide Nanoparticles Induce Less Damage to Plasmid DNA but Higher
Cytotoxicity to HeLa Cells
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Abstract
In this paper, nano-TiO<sub>2</sub> was functionalized
by different methods, and its genotoxicity and cytotoxicity were studied
in detail. The genotoxicity of nano-TiO<sub>2</sub> was evaluated
by observing its interactions with pUC19 plasmid DNA at a single molecule
level using atomic force microscopy. The results show that with the
assistance of UVA radiation, RGDC functionalized nano-TiO<sub>2</sub> induced less damage to plasmid DNA than unmodified ones. The HeLa
cell-specific PDT effect was investigated by cytotoxicity assay correspondingly.
RGDC-functionalized nano-TiO<sub>2</sub> shows the highest killing
effect to HeLa cells with the assistance of UVA radiation. The reasons
that cause the contradiction between genotoxicity and cytotoxicity
were analyzed, and the molecular mechanisms of the PDT effects were
discussed. The results show that the genotoxicity of nano-TiO<sub>2</sub> to plasmid DNA and its cytotoxicity to HeLa cells are related
but also different. The RGDC functionalization is an effective method
to increase the cytotoxicity of nano-TiO<sub>2</sub>