Mitochondria-targeting single-walled carbon nanotubes for cancer photothermal therapy

Nanomaterials have recently attracted much attention as efficient transducers for cancer photothermal therapy, based on their intrinsic absorption properties in the near-infrared region. This study explores a novel therapy model with mitochondria-targeting single-walled carbon nanotubes (SWNTs), which act efficiently to convert 980-nm laser energy into heat and selectively destroy the target mitochondria, thereby inducing mitochondrial depolarization, cytochrome c release, and caspase 3 activation. The laser+SWNTs process affords remarkable efficacy in suppressing tumor growth in a breast cancer model, and results in complete tumor regression in some cases. Laser+SWNTs could prove to be a promising selective local treatment modality, while minimizing adverse side effects. A novel therapy model with mitochondria- targeting single-walled carbon nanotubes (SWNTs), which convert laser energy into heat and selectively destroy the target mitochondria, is explored. The procedure induces cytochrome c release and cell apoptosis. The laser-SWNT method could be a promising selective local treatment modality, while minimizing adverse side effects.