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This study introduces a novel 3D iridium-based metal-covalent organic framework (3D Ir-MCOF) that enhances cancer radiotherapy by improving radiosensitization and activating the immune system, turning "cold" tumors into "hot" ones.

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Cancer Research

Background:

  • Radiotherapy (RT) is a key cancer treatment but faces limitations from tumor radioresistance and immune suppression.
  • Current STING agonists for immunotherapy have issues with stability, delivery, and toxicity.

Purpose of the Study:

  • To develop a multifunctional nanoplatform for combined radiosensitization and innate immune activation.
  • To overcome the limitations of traditional radiotherapy and immunotherapy.

Main Methods:

  • Development of a 3D iridium-based metal-covalent organic framework (3D Ir-MCOF) loaded with MSA-2.
  • Utilizing the framework's high-Z iridium for enhanced X-ray deposition and ROS generation.
  • Exploiting the porous architecture for pH-responsive drug release in the tumor microenvironment.

Main Results:

  • The 3D Ir-MCOF demonstrated simultaneous radiosensitization and tumor-specific immune activation.
  • Synchronized DNA damage and immune activation led to dendritic cell maturation and T-cell infiltration.
  • Successfully converted immunologically
  • cold
  • tumors into
  • hot
  • ones.

Conclusions:

  • 3D MCOFs represent a promising nanoplatform for next-generation cancer therapy.
  • This approach enables concurrent radiosensitization and targeted immune agonist delivery.
  • The developed nanoplatform effectively addresses limitations of current RT and immunotherapy strategies.