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Related Concept Videos

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.
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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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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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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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Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
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Related Experiment Video

Updated: Dec 9, 2025

Generation of Induced Regulatory T Cells from Primary Human Na&#239;ve and Memory T Cells
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Tolerance induction in memory CD4 T cells is partial and reversible.

Joshua I Gray1, Shaima Al-Khabouri1, Fraser Morton1

  • 1Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, UK.

Immunology
|September 15, 2020
PubMed
Summary
This summary is machine-generated.

Memory CD4 T cells survive re-activation but show altered function. They struggle to divide after antigen re-exposure without adjuvant, impacting tolerance strategies.

Keywords:
memory CD4 T cellsmitotic catastropheproliferationtolerance

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Area of Science:

  • Immunology
  • Cellular Biology

Background:

  • Memory T cells provide rapid secondary immune responses.
  • Controlling memory T cells is crucial for autoimmunity tolerance strategies.
  • Memory CD4 T cells are less dependent on co-stimulation for rapid responses.

Purpose of the Study:

  • To investigate the functional and transcriptional changes in memory CD4 T cells upon reactivation without adjuvant.
  • To understand the implications for antigen-specific tolerance induction.

Main Methods:

  • Reactivation of memory CD4 T cells with antigen (with and without adjuvant).
  • Analysis of cell proliferation, cytokine production, and cell cycle.
  • Transcriptional analysis, including DNA repair enzyme expression.

Main Results:

  • Memory CD4 T cells survive secondary activation without adjuvant.
  • Following tertiary immunization with adjuvant, cells proliferate poorly but retain cytokine production.
  • Impaired cell division is linked to low DNA repair enzyme expression.
  • Proliferation is restored upon viral re-infection.

Conclusions:

  • Antigen-specific tolerance strategies require consideration of multiple T cell function parameters.
  • Low DNA repair enzyme expression may contribute to deletional tolerance of memory CD4 T cells.