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Related Concept Videos

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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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The Tumor Microenvironment02:17

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Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...
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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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Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
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Metastasis is the spread of cancer cells from the original site to distant locations in the body. Cancer cells can spread via blood vessels (hematogenous) as well as lymph vessels in the body.
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The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
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Tumor Transplantation for Assessing the Dynamics of Tumor-Infiltrating CD8+ T Cells in Mice
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Tumor-derived extracellular vesicles: Hijacking T cell function through exhaustion.

RuiJuan Guo1, Ping Wang1

  • 1Department of Oncology, Yantaishan Hospital Affiliated to Binzhou Medical University, Yantai, Shandong 264003, China.

Pathology, Research and Practice
|April 1, 2025
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Tumor-derived extracellular vesicles (TEVs) suppress anti-tumor immunity by causing T cell exhaustion. Understanding TEV mechanisms is key to overcoming immune evasion and improving cancer therapies.

Keywords:
ExhaustionExtracellular vesiclesT cellTumor-derived extracellular vesicles

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Area of Science:

  • Immunology
  • Cancer Biology
  • Cell Biology

Background:

  • Extracellular vesicles (EVs) mediate intercellular communication in the tumor microenvironment (TME).
  • Tumor-derived EVs (TEVs) carry molecular cargo that influences immune cells, particularly T cells.
  • T cell dysfunction and exhaustion are critical hurdles in effective anti-cancer immunity.

Purpose of the Study:

  • To elucidate the role of TEVs in T cell dysfunction within the TME.
  • To identify TEV-mediated mechanisms contributing to immune suppression and evasion.
  • To explore the implications of TEVs in resistance to cancer immunotherapies.

Main Methods:

  • Analysis of molecular cargo (proteins, lipids, nucleic acids) within TEVs.
  • Investigating the impact of TEVs on T cell proliferation, cytokine production, and cytotoxic activity.
  • Examining TEV involvement in immune checkpoint inhibitor and T cell therapy resistance.

Main Results:

  • TEVs carry immunosuppressive molecules like TGF-β and specific miRNAs.
  • These TEV cargoes induce T cell exhaustion, characterized by reduced function.
  • TEVs contribute to an immunosuppressive TME, promoting tumor progression and immune evasion.
  • TEVs are linked to resistance against current cancer immunotherapies.

Conclusions:

  • TEVs are significant mediators of T cell dysfunction and exhaustion in cancer.
  • Targeting TEV-mediated immunosuppression offers a potential strategy to enhance anti-tumor immunity.
  • Further understanding of TEV molecular pathways is essential for developing novel cancer therapeutics.
  • Reinvigorating exhausted T cells via TEV modulation could improve treatment outcomes.