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Related Concept Videos

T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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...
Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
T Cell Types and Functions01:24

T Cell Types and Functions

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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Affinity and Avidity01:41

Affinity and Avidity

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B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
Cells of the Adaptive Immune Response01:23

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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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Preparation and Applications of Organotypic Thymic Slice Cultures
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Published on: August 6, 2016

T-cell receptor affinity in thymic development.

Amy E Moran1, Kristin A Hogquist

  • 1Center for Immunology, University of Minnesota, Minneapolis, MN 55414, USA.

Immunology
|December 21, 2011
PubMed
Summary
This summary is machine-generated.

T-cell receptor (TCR) affinity and altered peptide models explain how the thymus generates functional, self-tolerant T cells. New tools reveal how TCR signal strength guides T-cell development and selection.

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Last Updated: May 26, 2026

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Published on: August 6, 2016

Preparation of Single-Cell Suspension of Mouse Thymic Epithelial Cells and Staining of Intracellular Molecules for Flow Cytometric Analysis
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Preparation of Single-Cell Suspension of Mouse Thymic Epithelial Cells and Staining of Intracellular Molecules for Flow Cytometric Analysis

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Isolation and Ex Vivo Culture of V&#948;1+CD4+&#947;&#948; T Cells, an Extrathymic &#945;&#946;T-cell Progenitor
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Published on: December 7, 2015

Area of Science:

  • Immunology
  • Cell Biology
  • Developmental Biology

Background:

  • The thymus generates functional and self-tolerant T lymphocytes crucial for adaptive immunity.
  • T-cell receptor (TCR) affinity for ligands plays a role in T-cell development within distinct thymic niches.
  • The 'selection paradox' remains, suggesting affinity alone doesn't fully explain thymic T-cell selection processes.

Purpose of the Study:

  • To explore how T-cell receptor (TCR) affinity and altered peptide models contribute to T-cell development in the thymus.
  • To investigate the role of TCR signal strength in guiding T-cell fate decisions during thymocyte development.
  • To synthesize current understanding of TCR signaling in the context of conventional and regulatory T-cell generation.

Main Methods:

  • Analysis of TCR response to ligands with varying affinities.
  • Investigation of spatially segregated thymic regions with unique protease and cytokine expression.
  • Utilizing novel tools to measure TCR signal strength perceived by T cells.
  • Employing transgenic mouse models for regulatory T-cell studies.
  • Application of tetramer enrichment strategies for thymocyte analysis.

Main Results:

  • TCR affinity is a key factor, but not the sole determinant, in thymic T-cell selection.
  • The combination of TCR affinity and altered peptide models provides a more comprehensive explanation for T-cell development.
  • New methodologies offer deeper insights into the quantitative aspects of TCR signaling during thymocyte maturation.
  • Evidence supports the integration of affinity and altered peptide models for understanding T-cell fate.

Conclusions:

  • A nuanced understanding of T-cell development requires considering both TCR affinity and altered peptide interactions.
  • TCR signal strength, as perceived by thymocytes, is critical for generating functionally competent and self-tolerant T cells.
  • Advancements in research tools are crucial for dissecting the complex mechanisms of thymic selection and T-cell repertoire formation.