Enhanced Cerenkov Radiation Induced Photodynamic Therapy for Cancer Immunotherapy

Strategic Insights -

Researchers from the First Affiliated Hospital of Zhengzhou University in China have developed a novel approach to cancer gene therapy using Cerenkov radiation induced photodynamic therapy (CR-PDT). This method overcomes the limitations of conventional photodynamic therapy by harnessing the energy from radioisotopes to generate fluorescence, which enhances anti-tumor effects. The study, published in the Asian Journal of Pharmaceutical Sciences, demonstrated that this approach can effectively inhibit tumor growth and metastasis in mice models.

Key Takeaways:

  • The researchers developed a glutathione-responsive biomimetic nanoplatform, HMME-Eu@LEV, which combines photosensitizer hematoporphyrin monomethyl ether (HMME) and radiolabel Eu3+ to convert gamma radiation into fluorescence.
  • The sequential administration of HMME-Eu@LEV and radiopharmaceutical 18F-fluorodeoxyglucose (FDG) ensures co-localization at the tumor site, triggering enhanced CR-PDT and immunogenic cell death.
  • The study observed a 5.6-fold increase in Cerenkov luminescence intensity from Eu@LEV+FDG compared to FDG alone, leading to the generation of abundant reactive oxygen species (ROS) and the polarization of macrophages from M2 to M1.
  • The immunosuppressive tumor microenvironment was reversed by promoting the maturation of dendritic cells and infiltration of cytotoxic T lymphocytes.
  • The activated immune system effectively inhibited the growth of primary tumors and spread of distant metastases, demonstrating the feasibility of CR-PDT without an external light source.

Statistics:

  • The Cerenkov luminescence intensity from Eu@LEV+FDG was approximately 5.6-fold higher than that from FDG alone.
  • The study observed a significant increase in ROS generation, which contributed to the enhancement of anti-tumor effects.
  • The research demonstrated a higher efficiency of luminescence resonance energy transfer between Eu3+ and HMME, which is crucial for the success of CR-PDT.

Sources:

  • Qian, R., et al. "Enhanced Cerenkov radiation induced photodynamic therapy based on GSH-responsive biomimetic nanoplatform to trigger immunogenic cell death for tumor immunotherapy." Asian Journal of Pharmaceutical Sciences, 2025, 20(4): 101070.
  • Asian Journal of Pharmaceutical Sciences, published by Elsevier, https://www.journals.elsevier.com/asian-journal-of-pharmaceutical-sciences/
  • https://doi.org/10.1016/j.ajps.2025.101070
  • Ruijie Qian, Department of Interventional Radiology, First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, People's Republic of China.