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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

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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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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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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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Diversity of Antigen Receptors01:28

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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.
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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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CD4 memory T cells develop and acquire functional competence by sequential cognate interactions and stepwise gene

Tomohiro Kaji1, Atsushi Hijikata2, Akiko Ishige3

  • 1Laboratory for Immunological Memory, RIKEN Research Center for Allergy and Immunology, 1-7-22, Suehirocho, Tsurumi, Yokohama, Kanagawa 230-0045, Japan.

International Immunology
|December 31, 2015
PubMed
Summary

Memory CD4(+) T cells develop into specialized cells that enhance memory B cell differentiation, requiring the transcription factor Bcl6. This process involves stepwise gene expression and distinct cellular interactions.

Keywords:
Bcl6 (B-cell lymphoma 6)CD4 memory T-cell developmentT-follicular helper cellscognate interaction with non-GC B cellsmemory B-cell recall responsestepwise transcriptional regulation

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • CD4(+) T cells are crucial for effective humoral immunity and B cell memory.
  • The precise mechanisms by which memory T cells acquire their enhanced functions remain incompletely understood.

Purpose of the Study:

  • To elucidate the developmental pathway and key molecular regulators of memory CD4(+) T cells.
  • To investigate the role of B-cell lymphoma 6 (Bcl6) in memory T cell differentiation.
  • To identify genetic markers distinguishing memory T cells from other T cell subsets.

Main Methods:

  • Analysis of CD4(+) T cell differentiation and function in vitro and in vivo.
  • Gene expression profiling to identify key regulatory genes.
  • Investigated the role of Bcl6 and germinal center B cells in memory T cell development.

Main Results:

  • Memory CD4(+) T cells differentiate more effectively than naive T cells, promoting memory B cell terminal differentiation.
  • Memory T cell development requires Bcl6 but not germinal center B cells.
  • Absence of cognate B cells impairs memory T cell function and alters gene expression profiles.
  • Memory T cells share metabolic gene expression signatures with T follicular helper (Tfh) cells, distinct from naive T cells.
  • Gdpd3 identified as a potential genetic marker for memory T cells.

Conclusions:

  • Memory T cell development is a stepwise process regulated by specific transcription factors and antigen-presenting cell interactions.
  • Bcl6 is essential for memory T cell lineage commitment and functional maturation.
  • Distinct gene expression profiles, including metabolic pathways, characterize memory T cells.
  • Gdpd3 represents a novel candidate marker for identifying memory T cells.