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Related Concept Videos

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.
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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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Cytotoxic T Cells-mediated Immune Response01:27

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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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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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Related Experiment Video

Updated: Apr 3, 2026

In Vitro Resident Memory CD8 T Cell Differentiation Using Epithelial Organoid-T Cell Co-culture System
09:48

In Vitro Resident Memory CD8 T Cell Differentiation Using Epithelial Organoid-T Cell Co-culture System

Published on: February 3, 2026

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Functional classification of memory CD8(+) T cells by CX3CR1 expression.

Jan P Böttcher1, Marc Beyer2, Felix Meissner3

  • 1Institute of Experimental Immunology, Universitätsklinikum Bonn, Sigmund-Freud-Street 25, Bonn 53105, Germany.

Nature Communications
|September 26, 2015
PubMed
Summary

The fractalkine receptor CX3CR1 identifies cytotoxic CD8(+) T cells, distinct from those with proliferative capacity. This discovery aids understanding protective CD8(+) T cell memory during infections.

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Area of Science:

  • Immunology
  • Cell Biology
  • Virology

Background:

  • Memory CD8(+) T cell localization is linked to function.
  • Distinguishing between effector and proliferative memory T cells is crucial.

Purpose of the Study:

  • To investigate the role of CX3CR1 in defining CD8(+) T cell memory subsets.
  • To identify molecular signatures associated with cytotoxic effector function.

Main Methods:

  • Transcriptome and proteome profiling of CD8(+) T cells.
  • Analysis of CX3CR1 expression and its correlation with cell function.
  • Tracking T cell populations in lymphoid and peripheral tissues.

Main Results:

  • CX3CR1 expression distinguishes cytotoxic effector CD8(+) T cells from proliferative ones.
  • CX3CR1 defines a core molecular signature of effector memory T cells.
  • A subset of CD62L(hi)CX3CR1(+) T cells resides in lymph nodes with specific migration patterns.

Conclusions:

  • CX3CR1 is a key marker for classifying CD8(+) T cell memory function.
  • Understanding CX3CR1+ T cells offers insights into protective immunity.
  • Therapeutic interventions may enhance virus-specific CX3CR1(+) CD8(+) T cells during chronic infections.