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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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Related Experiment Video

Updated: Jan 6, 2026

Isolation of Myeloid Dendritic Cells and Epithelial Cells from Human Thymus
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Thymic Dendritic Cells Revisited.

Matouš Vobořil1,2, Shuya Xuan1, Kristin A Hogquist1

  • 1Department of lab Medicine and Pathology, Center for Immunology, University of Minnesota Medical School, Minneapolis, Minnesota, USA.

Immunological Reviews
|November 18, 2025
PubMed
Summary
This summary is machine-generated.

Thymic dendritic cells (DCs) are crucial for immune self-tolerance by presenting diverse antigens to developing T cells. This review details DC subsets and their specialized roles in ensuring a safe and effective T cell repertoire.

Keywords:
T cellscell lineages and subsetsthymustissuestolerance

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Central tolerance in the thymus is vital for preventing autoimmunity.
  • Antigen-presenting cells (APCs), especially dendritic cells (DCs), are key players in thymic tolerance.
  • DCs acquire a wide array of self-antigens for T cell repertoire selection.

Purpose of the Study:

  • To review the ontogeny, transcriptional control, and functional specialization of thymic DCs.
  • To compare thymic DC subsets with their peripheral counterparts.
  • To highlight the heterogeneity and diverse roles of APCs in thymic tolerance.

Main Methods:

  • Review of existing literature on thymic dendritic cell biology.
  • Comparison of DC subset functions and localizations.
  • Analysis of factors shaping APC diversity in the thymus.

Main Results:

  • Thymic DCs exhibit functional specialization: DC1s for cross-presentation and Treg generation, DC2s for clonal deletion.
  • DC2s are heterogeneous, comprising four distinct subsets.
  • Plasmacytoid DCs, transitional DCs, monocytes, and macrophages contribute to tolerance through various mechanisms.

Conclusions:

  • Thymic APCs, particularly DCs, are highly heterogeneous and functionally specialized.
  • Understanding thymic DC biology is crucial for comprehending immune self-tolerance.
  • Factors like maturation, inflammation, and immigration shape APC diversity and function.