The differential effect of apoferritin-PbS nanocomposites on cell cycle progression in normal and cancerous cells

We report the effects induced by near-infrared apoferritin-PbS (AFt-PbS) nanocomposites on cell cycle progression in non-tumorigenic and cancerous human cells. By using flow cytometry and Annexin V assay, we show that the cell cycle of non-tumorigenic cells is not altered by exposure to AFt-PbS nanoparticles at concentrations up to 1 mg mL(-1). In contrast, exposure of human-derived breast cancer cell lines to AFt-PbS at concentrations > 0.2 mg mL(-1) triggers apoptotic cell death. The selective death of cancerous cells and the near-infrared fluorescence properties of AFt-PbS could be exploited in both nanomedicine and in vivo imaging studies.