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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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Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
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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.
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Phenoscaping Reveals Multimodal γδ T-cell Cytotoxicity as a Strategy to Overcome Cancer Cell-Mediated

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Engineered gamma delta T cells use combined killing methods to overcome cancer's defenses. This multimodal approach enhances their ability to eliminate chemoresistant colorectal cancer stem cells, offering new immunotherapy strategies.

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Area of Science:

  • Immunology and Cancer Therapy
  • Cellular and Molecular Oncology

Background:

  • Gamma delta (γδ) T cells possess dual cytotoxic mechanisms: antibody-independent cytotoxicity (AIC) and antibody-dependent cellular cytotoxicity (ADCC).
  • Understanding the interplay between T cell donor variability, tumor heterogeneity, and γδ T cell killing is crucial for advancing immunotherapies.

Purpose of the Study:

  • To investigate how inter-donor heterogeneity (IDH) of γδ T cells and inter-tumor heterogeneity (ITH) of colorectal cancer (CRC) influence multimodal cytotoxic mechanisms.
  • To evaluate the efficacy of engineered γδ T cells in overcoming cancer cell-mediated immune evasion.

Main Methods:

  • Systematic single-cell phenoscaping analysis of over 1,000 co-cultures of γδ T cells and patient-derived colorectal cancer organoids (PDOs).
  • Analysis of post-translational modification (PTM) signaling, cell-cycle status, apoptosis, and T cell immunophenotypes.
  • Utilized engineered IL-15Rα-IL-15 fusion protein (stIL15) γδ T cells and assessed B7-H3-targeted ADCC.

Main Results:

  • Engineered stIL15 γδ T cells exhibited AIC against PDOs without external cytokine support.
  • Colorectal cancer cells adapted to AIC by rewiring γδ T cell PTM signaling networks in an ITH-dependent manner, suppressing cytotoxicity.
  • Combining AIC with B7-H3-targeted ADCC enabled stIL15 γδ T cells to overcome cancer-induced immunomodulation and kill chemoresistant colon cancer stem cells.

Conclusions:

  • Multimodal cytotoxicity, combining AIC and ADCC, is essential for γδ T cells to overcome ITH-specific immune evasion strategies employed by cancer cells.
  • Engineered γδ T cells with combined cytotoxic mechanisms demonstrate potential for targeting chemoresistant cancer stem cells, paving the way for novel immunotherapeutic approaches.