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We investigated the anticancer potential of Ag-doped (0.5–5%) anatase TiO 2  NPs. Characterization study showed that dopant Ag was well-distributed on the surface of host TiO 2  NPs. Size (15 nm to 9 nm) and band gap energy (3.32 eV to 3.15 eV) of TiO 2  NPs were decreases with increasing the concentration of Ag dopant. Biological studies demonstrated that Ag-doped TiO 2  NP-induced cytotoxicity and apoptosis in human liver cancer (HepG2) cells. The toxic intensity of TiO 2  NPs was increases with increasing the amount of Ag-doping. The Ag-doped TiO 2  NPs further found to provoke reactive oxygen species (ROS) generation and antioxidants depletion. Toxicity induced by Ag-doped TiO 2  NPs in HepG2 cells was efficiently abrogated by antioxidant N-acetyl-cysteine (ROS scavenger). We also found that Ag-doped TiO 2  NPs induced cytotoxicity and oxidative stress in human lung (A549) and breast (MCF-7) cancer cells. Interestingly, Ag-doped TiO 2  NPs did not cause much toxicity to normal cells such as primary rat hepatocytes and human lung fibroblasts. Overall, we found that Ag-doped TiO 2  NPs have potential to selectively kill cancer cells while sparing normal cells. This study warranted further research on anticancer potential of Ag-doped TiO 2  NPs in various types of cancer cells and  in vivo  models.

Ag-doping regulates the cytotoxicity of TiO2 nanoparticles via oxidative stress in human cancer cells