Novel nanoparticles prepared from isothiocyanate derivatives for phototherapy of tumor.

Phototherapy is a new method to treat tumor, including photodynamic therapy (PDT) and photothermal therapy (PTT). However, the GSH in tumor cells could deplete ROS produced by photosensitizers, resulting in inadequate PDT. Isothiocyanate not only is a new type of anti-tumor drug, but also may combine with GSH, increasing the content of intracellular ROS and improving PDT effect. Here we synthesized a kind of water-soluble nanoparticles (BN NPs) parceling BODIPY-I-35 up with mPEG-ITC and lecithin. mPEG-ITC can react with GSH in tumor cells to reduce the consumption of ROS. BN NPs can be used as vectors to deliver drugs to tumor sites. Under 808 nm laser irradiation, BN NPs solution increased 13 °C within 10 min, indicating that BN NPs had superb photothermal performance. In vitro experiments, low dose BN NPs showed satisfactory PDT and PTT effects, and the cell viability of MCF-7 cell was only 13%. In vivo, BN NPs with excellent biocompatibility showed favorable phototherapy effect and tumor was effectively inhibited. Fluorescence imaging could present the long retention effect of BN NPs in tumor locations. In conclusion, the BN NPs showed the effect of enhancing phototherapy and provided a remarkable application prospect in the phototherapy of tumor cells.