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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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T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
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B Cell Activation and Differentiation01:24

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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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T Cell Types and Functions01:24

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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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The Tumor Microenvironment02:17

The Tumor Microenvironment

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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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IL3-Driven T Cell-Basophil Crosstalk Enhances Antitumor Immunity.

Jian Wei1,2, Colleen L Mayberry2, Xiaoting Lv1

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Cancer Immunology Research
|May 13, 2024
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Interleukin-3 (IL3) boosts cancer immunity by enhancing cytotoxic T lymphocytes (CTLs) and their communication with basophils. Supplementing IL3 improves anti-tumor responses, offering a new immunotherapy strategy.

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Area of Science:

  • Immunology
  • Cancer Biology
  • T cell biology

Background:

  • Cytotoxic T lymphocytes (CTLs) are crucial for anti-cancer immunity but are often impaired by the tumor microenvironment, leading to exhaustion.
  • Interleukin-3 (IL3) dysregulation is implicated in compromised CTL function within tumors.

Purpose of the Study:

  • To investigate the role of IL3 in modulating CTLs and orchestrating anti-tumor immunity.
  • To explore the therapeutic potential of IL3 supplementation in enhancing anti-cancer responses.

Main Methods:

  • Assessed IL3 production in intratumoral CTLs and correlated it with cytotoxic function.
  • Administered recombinant IL3, IL3-expressing tumor cells, or IL3-engineered CD8+ T cells to augment IL3 levels.
  • Utilized Rag1 knockout mice and CD8+ T-cell depletion models to confirm CTL dependence.
  • Investigated the role of basophils and IL4 in mediating IL3's effects.
  • Examined IL4 production by basophils and its impact on CTLs in IL4 knockout mice.

Main Results:

  • Intratumoral CTLs showed decreased IL3 production correlating with reduced cytotoxic activity.
  • IL3 supplementation enhanced CTL activity and conferred protection against tumor progression.
  • The therapeutic effect of IL3 was dependent on CTLs and involved IL3-mediated cross-talk with basophils.
  • IL3-activated basophils produced IL4, which boosted CTL IFNγ production and viability, crucial for anti-tumor immunity.

Conclusions:

  • IL3 plays a critical role in maintaining CTL function and orchestrating anti-tumor immunity through a CTL-basophil-IL4 axis.
  • Augmenting IL3 levels represents a promising strategy for enhancing cancer immunotherapy efficacy.