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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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Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

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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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T Cell Types and Functions01:24

T Cell Types and Functions

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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.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
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B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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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...
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Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

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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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Development of Immunocompetence01:22

Development of Immunocompetence

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The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...
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Related Experiment Video

Updated: Dec 19, 2025

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

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Building a T cell compartment: how immune cell development shapes function.

Miles P Davenport1, Norah L Smith2, Brian D Rudd2

  • 1Kirby Institute for Infection and Immunity, University of New South Wales Australia, Sydney, New South Wales, Australia. m.davenport@unsw.edu.au.

Nature Reviews. Immunology
|June 5, 2020
PubMed
Summary
This summary is machine-generated.

Naive T cells possess a hidden layer of diversity shaped by their developmental history, influencing immune responses throughout life. This developmental bias, not just random chance, impacts T cell specialization and function from infancy to adulthood.

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Area of Science:

  • Immunology
  • Cell Biology
  • Developmental Biology

Background:

  • The peripheral T cell compartment exhibits significant diversity.
  • T cell specialization and plasticity contribute to this diversity.
  • Individual naive T cells show biases towards specific phenotypes post-stimulation.

Purpose of the Study:

  • To explore the concept of a 'hidden layer' of T cell diversity.
  • To investigate how developmental history influences naive T cell phenotypes.
  • To re-evaluate the origins of T cell diversity beyond random factors.

Main Methods:

  • The study is primarily a conceptual review and argument.
  • It synthesizes existing knowledge on T cell differentiation and aging.
  • No new experimental data was generated for this specific argument.

Main Results:

  • T cell diversity is not solely due to stochastic events during stimulation.
  • The developmental history of naive T cells creates persistent biases.
  • Immune challenges during ontogeny shape distinct T cell functional properties.

Conclusions:

  • A developmental history-based 'hidden layer' of diversity exists in naive T cells.
  • This diversity persists into adulthood and influences immunity.
  • Understanding this layer offers new perspectives for immunity and immunotherapy across the lifespan.