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Related Concept Videos

Cytotoxic T Cells-mediated Immune Response01:27

Cytotoxic T Cells-mediated Immune Response

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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.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
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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 Types and Functions01:24

T Cell Types and Functions

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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.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
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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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Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

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Overview
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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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Related Experiment Video

Updated: Jun 14, 2025

Generation of Orthotopic Pancreatic Tumors and Ex vivo Characterization of Tumor-Infiltrating T Cell Cytotoxicity
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CD4+ T cells in antitumor immunity.

Elena Montauti1, David Y Oh1, Lawrence Fong2

  • 1Division of Hematology/Oncology, Department of Medicine, University of California San Francisco, San Francisco, CA, USA.

Trends in Cancer
|September 6, 2024
PubMed
Summary

Cancer immunotherapies harness T cells for treatment. While CD8+ T cells are key, CD4+ T cells also fight tumors and impact treatment success, offering new therapeutic targets.

Keywords:
CD4(+) T lymphocytesantigen-presenting cellscancer immunotherapy

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Area of Science:

  • Immunology
  • Oncology
  • Cancer Research

Background:

  • Cancer immunotherapy has revolutionized cancer care, with treatments like immune checkpoint inhibition (ICI) and adoptive T cell therapies (ACTs) showing significant success.
  • Therapeutic benefits are often linked to enhanced antitumor CD8+ T cell responses.
  • Emerging evidence highlights crucial roles for CD4+ T cells in antitumor immunity.

Purpose of the Study:

  • To explore the multifaceted roles of CD4+ T cells in antitumor immune responses.
  • To investigate the impact of CD4+ T cell populations and plasticity within the tumor microenvironment (TME) on treatment outcomes.
  • To identify strategies for optimizing antitumor CD4+ T cell functions while mitigating protumorigenic activities.

Main Methods:

  • Review of current literature on cancer immunotherapy and T cell functions.
  • Analysis of the mechanisms by which CD4+ T cells contribute to antitumor immunity, including cytotoxicity and T cell help.
  • Examination of the influence of CD4+ T cell populations and their plasticity in the TME on responses to ICI, ACTs, and cancer vaccines.

Main Results:

  • CD4+ T cells provide essential help for CD8+ T cell responses through co-stimulation and cytokine production.
  • Certain CD4+ T cell subsets exhibit direct cytotoxicity against tumor cells or modulate other immune cells within the TME.
  • The composition and plasticity of CD4+ T cell populations in the TME are critical determinants of clinical efficacy for various immunotherapies.

Conclusions:

  • CD4+ T cells are integral to effective antitumor immunity, acting beyond a helper role.
  • Targeting specific CD4+ T cell subsets and understanding their plasticity in the TME is crucial for enhancing immunotherapy efficacy.
  • Future strategies should focus on inducing beneficial CD4+ T cell functions while suppressing their protumorigenic potential for improved cancer treatment outcomes.