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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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Cancer Vaccines01:30

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Cancer treatment vaccines are a rapidly evolving field that offers a promising approach to immunotherapy. Unlike traditional vaccines that prevent diseases, cancer treatment vaccines are designed to treat existing cancers by stimulating the immune system to recognize and attack cancer cells.
Cancer vaccines come in two categories: preventive (prophylactic) and treatment (active). Preventive vaccines, such as the Human Papillomavirus (HPV) vaccine, protect against viruses that cause certain...
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Combination Therapies and Personalized Medicine02:50

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Combining two or more treatment methods increases the life span of cancer patients while reducing damage to vital organs or tissue from the overuse of a single treatment. Combination therapy also targets different cancer-inducing pathways, thus reducing the chances of developing resistance to treatment.
The combination of the drug acetazolamide and sulforaphane is a good example of combination therapy to treat cancer. The cells in the interior of a large tumor often die due to the hypoxic and...
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Targeted Cancer Therapies02:57

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The targeted cancer therapies, also known as “molecular targeted therapies,” take advantage of the molecular and genetic differences between the cancer cells and the normal cells. It needs a thorough understanding of the cancer cells to develop drugs that can target specific molecular aspects that drive the growth, progression, and spread of cancer cells without affecting the growth and survival of other normal cells in the body.
There are several types of targeted therapies against...
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DNA Nanoclusters Combined with One-Shot Radiotherapy Augment Cancer Immunotherapy Efficiency.

Yuexia Xie1,2,3, Huishan Li1, Lei Xu4

  • 1State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200032, China.

Advanced Materials (Deerfield Beach, Fla.)
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Summary
This summary is machine-generated.

This study introduces DNA nanoclusters (DNAnc) loaded with CpG oligonucleotides (ODNs) to enhance cancer immunotherapy. These nanoclusters effectively repolarize macrophages, boosting the abscopal effect and leading to durable antitumor immunity.

Keywords:
DNA nanoclustersimmunotherapymacrophagesradiotherapytumor microenvironment reprogramming

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Area of Science:

  • Oncology
  • Immunology
  • Nanotechnology
  • Biochemistry

Background:

  • Immunotherapy is a promising cancer treatment.
  • Combining immunotherapy with radiotherapy enhances the abscopal effect.
  • Tumor microenvironment's immune tolerance limits abscopal effect generation.

Purpose of the Study:

  • To design a novel DNA nanocluster (DNAnc) for enhanced cancer immunotherapy.
  • To investigate the DNAnc's ability to load CpG-ODNs and improve macrophage repolarization.
  • To evaluate the DNAnc-mediated abscopal effect and its impact on antitumor immunity.

Main Methods:

  • Self-assembly of Y-shaped double-stranded DNA vectors to create DNAncs.
  • Loading of CpG-ODNs into DNAncs, achieving high copy numbers per nanostructure.
  • In vitro and in vivo studies to assess macrophage repolarization, endocytosis, and abscopal effect.
  • Evaluation of long-term antitumor immunity, metastasis inhibition, and recurrence prevention.

Main Results:

  • DNAncs demonstrated high loading capacity for CpG-ODNs (≈8125.5 ± 822.5 copies per nanostructure).
  • DNAncs increased resistance to nuclease degradation and enhanced macrophage repolarization to an M1-like phenotype.
  • DNAncs, combined with radiotherapy, induced a robust abscopal effect via macrophage accumulation and repolarization.
  • The treatment generated potent, long-term antitumor immunity, inhibiting metastasis and preventing recurrence.

Conclusions:

  • The designed DNAnc is a novel strategy to overcome immune tolerance in the tumor microenvironment.
  • DNAncs effectively boost the abscopal effect of combined immunotherapy and radiotherapy.
  • This approach offers a promising new avenue for durable cancer treatment and prevention of recurrence.