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Related Concept Videos

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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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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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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Primary Lymphoid Organs01:16

Primary Lymphoid Organs

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Primary lymphoid organs are pivotal in the formation, development, and maturation of lymphocytes, the white blood cells that serve as the backbone of our immune system. This crucial function underscores their fundamental role in maintaining our overall health and immunity. The two primary lymphoid organs of prime importance are the red bone marrow and the thymus.
The red bone marrow is a soft, spongy tissue nestled in the interior of long bones such as the humerus and femur. It is the site...
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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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Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

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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.
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...
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Analysis of Somatic Hypermutation in the JH4 intron of Germinal Center B cells from Mouse Peyer's Patches
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Analysis of Somatic Hypermutation in the JH4 intron of Germinal Center B cells from Mouse Peyer's Patches

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Id3 Orchestrates Germinal Center B Cell Development.

Shuwen Chen1, Masaki Miyazaki1, Vivek Chandra1

  • 1Department of Molecular Biology, University of California, San Diego, La Jolla, California, USA.

Molecular and Cellular Biology
|July 27, 2016
PubMed
Summary
This summary is machine-generated.

Id3 protein is crucial for germinal center B cell maturation and antibody production. Declining Id3 levels during the germinal center reaction are necessary for proper B cell signaling and differentiation.

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Interrogating Individual Autoreactive Germinal Centers by Photoactivation in a Mixed Chimeric Model of Autoimmunity
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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • E proteins induce activation-induced deaminase (AID) in activated B cells.
  • Germinal center (GC) B cells undergo critical differentiation processes.
  • The role of Id3 in GC B cell development requires further investigation.

Purpose of the Study:

  • To investigate the function of Id3 in germinal center B cells.
  • To determine the impact of Id3 depletion on B cell maturation and antibody production.
  • To elucidate the molecular mechanisms by which Id3 influences B cell signaling.

Main Methods:

  • Analysis of Id3 expression in follicular and germinal center B cells.
  • Immunization of mice with depleted Id3 expression.
  • In vitro studies of Id3-depleted B cells.
  • Assessment of B cell populations, antibody titers, and gene expression.

Main Results:

  • Id3 expression is high in follicular B cells but decreases in GC cells.
  • Id3 depletion in mice resulted in blocked GC B cell maturation, reduced marginal zone B cells, and decreased antibody titers.
  • In vitro, Id3-depleted B cells showed impaired class switch recombination and altered expression of signaling pathway genes.
  • Activation-induced deaminase (AID) levels were not affected by Id3 depletion.

Conclusions:

  • Id3 plays a critical role in germinal center B cell maturation and differentiation.
  • Declining Id3 levels during the GC reaction are essential for activating signaling pathways that promote B cell differentiation.
  • Id3 regulates B cell responses by modulating the expression of genes involved in antigen receptor, cytokine receptor, and chemokine receptor signaling.