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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.
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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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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 T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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Tailoring In Vivo Cytotoxicity Assays to Study Immunodominance in Tumor-specific CD8+ T Cell Responses
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TIM3 is a context-dependent coregulator of cytotoxic T cell function.

Hanin Alamir1, Carissa C W Wong1,2, Amal Alsubaiti1

  • 1School of Cellular and Molecular Medicine, University of Bristol, Bristol BS8 1TD, UK.

Science Signaling
|September 23, 2025
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Summary

T-cell immunoglobulin and mucin-domain containing-3 (TIM3) acts as an inhibitory receptor on suppressed cytotoxic T lymphocytes (CTLs) interacting with tumor cells. Its function depends on the T cell

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cancer Research

Background:

  • T-cell immunoglobulin and mucin-domain containing-3 (TIM3) is a receptor found on immune cells, including T cells, particularly those exposed to antigens long-term.
  • TIM3 is associated with functionally suppressed cytotoxic T lymphocytes (CTLs) within the tumor microenvironment.
  • TIM3 shows inhibitory functions in vivo, yet paradoxically demonstrates costimulatory T cell signaling in vitro.

Purpose of the Study:

  • To investigate the direct inhibitory role of TIM3 on cytotoxic T lymphocyte (CTL) function during interactions with tumor cells.
  • To elucidate the mechanism by which TIM3 regulates CTL function, specifically actin cytoskeleton polarization.
  • To determine how the expression of TIM3 ligands (CEACAM1, galectin 9) in different cellular contexts (cis vs. trans) affects TIM3 function.

Main Methods:

  • Direct interaction assays between murine and human CTLs and target tumor cell spheroids.
  • Analysis of actin cytoskeleton polarization in CTLs during cytolysis.
  • Investigation of TIM3 function in 2D tissue culture models with varying CTL activation states.

Main Results:

  • TIM3 directly inhibited the function of CTLs interacting with tumor cell spheroids.
  • TIM3 regulated the actin cytoskeleton polarization necessary for CTL-mediated cytolysis.
  • Ligand expression (CEACAM1, galectin 9) in trans enhanced TIM3 function, while cis expression of CEACAM1 had an opposing effect.
  • TIM3 acted as an inhibitory receptor on spheroid-suppressed CTLs but not on active CTLs in 2D culture.

Conclusions:

  • TIM3 enhances T cell function, acting as either a coinhibitory or costimulatory receptor.
  • The functional role of TIM3 is context-dependent, varying with the T cell's functional state.
  • These findings provide insights into TIM3's complex role in regulating anti-tumor immunity.