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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.
Naive T cells that have not yet encountered an antigen express two primary CD...
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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 immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
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Related Experiment Video

Updated: Apr 4, 2026

Tailoring In Vivo Cytotoxicity Assays to Study Immunodominance in Tumor-specific CD8+ T Cell Responses
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Helping the Help for CD8+ T Cell Responses.

Sebastian Amigorena1

  • 1INSERM U932, Institute Curie, 26 rue d'Ulm, 75248 Paris Cedex 05, France.

Cell
|September 12, 2015
PubMed
Summary

Researchers observed CD4+ and CD8+ T cells interacting with dendritic cells during immune responses. This unexpected "dance" between cell types is crucial for priming cytotoxic immunity against viruses.

Area of Science:

  • Immunology
  • Cell Biology
  • Virology

Background:

  • Priming cytotoxic immune responses is critical for viral clearance.
  • Dendritic cells (DCs) are key antigen-presenting cells in initiating T cell responses.
  • The dynamic interactions between T cells and DCs are not fully understood.

Purpose of the Study:

  • To investigate the dynamic behavior of CD4+ and CD8+ T cells during the priming of antiviral immune responses.
  • To elucidate the role of different dendritic cell subsets in T cell activation and differentiation.

Main Methods:

  • Utilized time-lapse intravital microscopy to visualize cellular dynamics in vivo.
  • Tracked the migratory patterns and interactions of CD4+ and CD8+ T cells with dendritic cell populations.

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Main Results:

  • Observed an unexpected "choreography" of T cell movement between distinct dendritic cell subpopulations.
  • Demonstrated dynamic T cell "dancing" behavior during the priming phase of cytotoxic immune responses.
  • Highlighted specific interactions crucial for initiating antiviral immunity.

Conclusions:

  • The study reveals a novel, dynamic interaction model between T cells and dendritic cells during immune priming.
  • This intricate cellular choreography is essential for the effective initiation of virus-specific cytotoxic T cell responses.