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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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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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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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Development of Immunocompetence01:22

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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.
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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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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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Updated: May 7, 2026

Flow Cytometric Characterization of Murine B Cell Development
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Flow Cytometric Characterization of Murine B Cell Development

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TACItness MZ B cell maturation.

Mauricio Guzmán1, Martyna Filipska1, Andrea Cerutti1,2

  • 1Barcelona Biomedical Research Park, Hospital del Mar Research Institute Barcelona (HMRIB) , Barcelona, Spain.

The Journal of Experimental Medicine
|May 5, 2026
PubMed
Summary
This summary is machine-generated.

TACI signals intrinsically drive marginal zone B cell development from T2 B cells. This occurs via PI3K-AKT pathway activation and suppression of the FOXO1-KLF2 axis, crucial for immune cell regulation.

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Generation of Immature, Mature and Tolerogenic Dendritic Cells with Differing Metabolic Phenotypes
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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Marginal zone B cells are critical for T cell-independent immune responses.
  • T cell-otypic antigen 1 (TACI) is a receptor involved in B cell maturation and survival.
  • Understanding the developmental pathways of B cell subsets is key to immune system research.

Purpose of the Study:

  • To elucidate the cell-intrinsic mechanisms by which TACI signaling influences marginal zone B cell development.
  • To identify the key molecular pathways mediating the transition of T2 B cells to marginal zone B cells.

Main Methods:

  • Flow cytometry analysis of B cell populations.
  • Western blotting to assess protein activation.
  • Gene expression analysis to identify regulatory pathways.

Main Results:

  • Cell-intrinsic TACI signals were found to be essential for the development of marginal zone B cells from T2 B cells.
  • Activation of the phosphoinositide 3-kinase-protein kinase B (PI3K-AKT) pathway was identified as a key downstream effect.
  • Inhibition of the forkhead box O1-Kruppel-like factor 2 (FOXO1-KLF2) axis was observed to be critical for this developmental process.

Conclusions:

  • TACI signaling directly controls marginal zone B cell development through specific intracellular pathways.
  • The PI3K-AKT and FOXO1-KLF2 pathways represent critical nodes in TACI-mediated B cell differentiation.
  • These findings provide new insights into the regulation of B cell subsets and their role in immunity.