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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...
Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

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...
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...
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.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...

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Related Experiment Video

Updated: Jun 6, 2026

Isolation and Ex Vivo Culture of Vδ1+CD4+γδ T Cells, an Extrathymic αβT-cell Progenitor
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Shaping the T-cell repertoire in the periphery.

Stacey Allen1, Stephen J Turner, Dorothée Bourges

  • 1Department of Biochemistry and Molecular Biology, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria, Australia.

Immunology and Cell Biology
|November 17, 2010
PubMed
Summary

Peripheral T-cell selection is crucial for immunity throughout life, shaping responses to pathogens and preventing autoimmunity. This process, involving extrathymic tissues and dendritic cells, impacts immune function with aging.

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Last Updated: Jun 6, 2026

Isolation and Ex Vivo Culture of Vδ1+CD4+γδ T Cells, an Extrathymic αβT-cell Progenitor
10:33

Isolation and Ex Vivo Culture of Vδ1+CD4+γδ T Cells, an Extrathymic αβT-cell Progenitor

Published on: December 7, 2015

Generation of Human Alloantigen-specific T Cells from Peripheral Blood
09:47

Generation of Human Alloantigen-specific T Cells from Peripheral Blood

Published on: November 21, 2014

Examination of Thymic Positive and Negative Selection by Flow Cytometry
14:29

Examination of Thymic Positive and Negative Selection by Flow Cytometry

Published on: October 8, 2012

Area of Science:

  • Immunology
  • Cell Biology
  • Aging Research

Background:

  • T cell selection is a continuous process extending beyond the thymus.
  • Self-reactive T cells must be controlled to prevent autoimmunity.
  • Effective T cell responses are vital for combating pathogens.

Purpose of the Study:

  • To review mechanisms of peripheral T cell selection.
  • To explore how T cell selection impacts pathogen defense.
  • To discuss the role of peripheral selection in aging immunity and dendritic cell function.

Main Methods:

  • Review of existing literature on T cell selection.
  • Analysis of immune response mechanisms in extrathymic tissues.
  • Examination of the role of dendritic cells in T cell differentiation.

Main Results:

  • Peripheral T cell selection actively maintains immune homeostasis.
  • Self-reactive T cells are eliminated or anergized in peripheral tissues.
  • Dendritic cells play a key role in directing T cell differentiation and function.
  • Aging impacts peripheral T cell selection, potentially compromising immune responses.

Conclusions:

  • Peripheral T cell selection is essential for lifelong immune competence.
  • Understanding these processes is critical for addressing age-related immune decline and autoimmune diseases.
  • Dendritic cell-mediated T cell education is a key focus for future research.