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Radionuclide-embedded gold nanoparticles (RIe-AuNPs) were developed as a highly sensitive and stable nuclear and optical imaging agent for efficient dendritic cell (DC)-based immunotherapy and sensitive tracking of DC-migration to lymph nodes. The RIe-AuNPs were synthesized via simple and straightforward DNA-based radiolabeling chemistry and additional Au shell formation strategies, leading to high radiosensitivity and excellent in vivo stability. The RIe-AuNPs exert no adverse effects on the biological functions of DCs, and labeled DCs show strong antitumor immunity for lung cancer. Furthermore, the high radiosensitivity of the RIe-AuNPs allows for sensitive and long-term monitoring of DC migration to draining lymph nodes. The developed Cerenkov radiation-based optical imaging approach provides quantitative and sensitive results comparable with that of positron emission tomography imaging. These results highlight the strong potential of the RIe-AuNPs as a highly sensitive and stable nuclear and optical imaging platform for future bioimaging application such as cell tracking and tumor imaging.

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Radionuclide-embedded gold nanoparticles for enhanced dendritic cell-based cancer immunotherapy, sensitive and quantitative tracking of dendritic cells with PET and Cerenkov luminescence