New indocyanine green therapeutic fluorescence nanoprobes assisted high-efficient photothermal therapy for cervical cancer

Photothermal therapy (PTT) is a promising and non-invasive treatment for cancer. As essential factors for PTT, photothermal agents (PTAs) have attracted widespread attention. However, high-efficient and biocompatible fluorescent PTAs are still not enough. In this study, new indocyanine green (IR820) was utilized as a fluorescence agent and a PTA on HeLa cells and subcutaneous cervical cancer models of mouse. To improve PTT effect and biocompatibility of IR820, the amphiphilic polymer Pluronic F-127 (F-127) was utilized to modify free IR820 molecules, to form [email protected] nanoparticles (NPs) by self-assembly method. Fortunately, [email protected] NPs exhibited desirable photothermal properties with high photothermal conversion efficiency of 35.2% and good photothermal stability. Cytotoxicity assay, in vitro  and  in vivo fluorescence imaging of [email protected] NPs exhibited satisfactory biocompatibility, excellent cellular uptake ability, and bioimaging capability on tumor sites. Meanwhile, [email protected] NPs owned cellular-therapy ability against cervical cancer under 793 nm laser irradiation observed in apoptosis assay. Furthermore, the excellent PTT effect (∼90%) in flow cytometry analysis endowed [email protected] NPs with the ability to ablate subcutaneous cervical tumors on nude mice . The newly formed [email protected] NPs have great potential for anti-tumor therapy and bioimaging of cervical cancer, which lays the foundation for the future development of biomedical applications .