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Related Concept Videos

Tumor Immunotherapy01:27

Tumor Immunotherapy

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Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
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Injectable versatile liquid-solid transformation implants alliance checkpoint blockade for magnetothermal

Mengna Wang1,2, Siyu Deng1, Yijia Cao3

  • 1Department of Pathology, College of Basic Medicine, Chongqing Medical University, Chongqing, 400016, PR China.

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|October 6, 2022
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This study introduces a novel magnetothermal-dynamic immunotherapy using injectable implants to enhance immunogenic cell death (ICD) in tumors. The strategy effectively eliminates primary and distant tumors, offering a new direction for cancer immunotherapy.

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CTLA4 checkpoint blockadeFree radicalsImmunogenic cell deathLiquid-solid transformationMagnetothermal

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Immunotherapy

Background:

  • Tumor immunosuppressive microenvironment (TIME) limits immunotherapy efficacy due to energy loss and low immunogenicity.
  • Existing treatments struggle to eliminate highly malignant tumors and prevent metastasis.
  • Current strategies often fail to induce sufficient immunogenic cell death (ICD).

Purpose of the Study:

  • To develop a magnetothermal-dynamic immunotherapy strategy for enhanced ICD and improved antitumor effects.
  • To overcome limitations of circulating energy loss and poor tumor penetration.
  • To investigate the synergistic effects of amplified ICD with checkpoint blockade therapy.

Main Methods:

  • Development of liquid-solid transformation porous versatile implants (Fe3O4/AIPH@PLGA) for minimally invasive injection.
  • Utilizing magnetothermal effects to trigger AIPH decomposition, generating free radicals and heat shock proteins (HSPs).
  • Evaluating therapeutic efficacy in orthotopic bilateral breast tumor models and analyzing immune cell responses.

Main Results:

  • The magnetothermal-dynamic strategy effectively induced large-scale ICD by evoking oxidative and ER stress.
  • Combined therapy achieved 90% inhibition of primary and distant tumors within 21 days.
  • Demonstrated induction of T-cell response, immune memory, and TIME reprogramming in vivo.

Conclusions:

  • Magnetothermally controlled, oxygen-independent free radical release offers a promising new direction for antitumor immunotherapy.
  • The developed implantable system overcomes energy loss and enhances tumor immunogenicity.
  • Synergistic combination with CTLA4 blockade significantly improves therapeutic outcomes in preclinical models.