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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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Dual-Responsive Turn-On T1 Imaging-Guided Mild Photothermia for Precise Apoptotic Cancer Therapy.

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  • 1MOE Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, and State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou, 350108, P. R. China.

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A novel dual-stimulation activated nanoparticulate system (DAS) enables precise, mild hyperthermia cancer therapy. This system uses T1 imaging to guide laser treatment, enhancing apoptosis while minimizing side effects.

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DNAzymesMRIapoptosisgene therapyphotothermal therapy

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Cancer Therapy

Background:

  • Apoptosis is a key cancer therapy pathway with minimal collateral damage.
  • Mild hyperthermia offers therapeutic potential but faces challenges like non-specific heating and heat shock protein resistance.

Purpose of the Study:

  • To develop a dual-stimulation activated, T1 imaging-based nanoparticulate system (DAS) for precise, mild hyperthermia-mediated apoptotic cancer therapy.
  • To overcome limitations of non-specific heating and acquired resistance in hyperthermia treatments.

Main Methods:

  • Developed a DAS incorporating Fe3O4 nanoparticles (quencher) and Gd-DOTA complexes (enhancer) linked by an m6A-caged, Zn2+-dependent DNAzyme.
  • The DNAzyme substrate contained a Gd-DOTA labeled sequence and an HSP70 antisense oligonucleotide.
  • Utilized cancer cell FTO enzyme to demethylate m6A, activating DNAzymes to release Gd-DOTA for T1 imaging and HSP70 inhibition.

Main Results:

  • Activated DNAzymes cleaved the substrate, releasing Gd-DOTA complexes, which enhanced T1 MRI signal for tumor visualization.
  • The released oligonucleotides included HSP70 antisense, inhibiting heat shock protein expression.
  • Mild photothermia (≈43°C) combined with HSP70 inhibition effectively promoted cancer cell apoptosis.

Conclusions:

  • The developed DAS enables precise tumor localization and targeted mild hyperthermia therapy via T1 imaging.
  • This integrated system effectively induces cancer cell apoptosis by combining photothermal effects with gene silencing.
  • The dual-stimulation strategy offers a promising alternative for advanced, targeted cancer treatment.