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Related Concept Videos

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.
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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 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.
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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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Related Experiment Video

Updated: Mar 1, 2026

Isolation and Th17 Differentiation of Na&#239;ve CD4 T Lymphocytes
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Isolation and Th17 Differentiation of Naïve CD4 T Lymphocytes

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TOX drives CD4+ TH1 effector function, antitumor immunity and autoimmune pathology.

Brianna Naizir1,2, Andrew C Scott3,4, Paul Zumbo5,6

  • 1Gerstner Sloan Kettering Graduate School, Sloan Kettering Institute, New York, NY, USA. naizirb@sloankettering.edu.

Nature Immunology
|February 27, 2026
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Summary

TOX protein drives CD4+ T helper 1 cell differentiation, promoting antitumor immunity and autoimmune responses. Conversely, it

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • TOX is a nuclear factor crucial for T cell development and function.
  • Its role in CD4+ T cells, particularly in differentiation and disease, remains less understood.
  • TOX is known to be involved in CD8+ T cell exhaustion during chronic antigen exposure.

Purpose of the Study:

  • To elucidate the function of TOX in CD4+ T cell differentiation.
  • To investigate the impact of TOX on T helper 1 (TH1) cell phenotypes and functions.
  • To explore the association of TOX with antitumor immunity and autoimmune diseases.

Main Methods:

  • Gain-of-function and loss-of-function studies in T cells.
  • Analysis of molecular programs and interferon-γ production.
  • Examination of TOX expression in patient samples and disease models.

Main Results:

  • TOX is essential for CD4+ TH1 cell differentiation, inducing TH1-associated gene expression and phenotypes.
  • TOX expression in CD4+ T cells correlates with enhanced cytotoxicity and antitumor immunity in cancer patients.
  • TOX drives pathogenic responses in autoimmune and inflammatory conditions.

Conclusions:

  • TOX plays opposing roles in CD4+ and CD8+ T cells: promoting TH1 cell fate and antitumor immunity in CD4+ T cells, while associated with exhaustion in CD8+ T cells.
  • TOX is a key regulator of TH1 cell differentiation and has implications in cancer immunotherapy and autoimmune diseases.
  • Targeting TOX may offer therapeutic strategies for cancer and autoimmune disorders.