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Related Concept Videos

B Cell Activation and Differentiation01:24

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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.
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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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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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Cell-mediated Immune Responses01:40

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Cytotoxic T Cells-mediated Immune Response01:27

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Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
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Related Experiment Video

Updated: Jun 3, 2025

Evaluation of T Follicular Helper Cells and Germinal Center Response During Influenza A Virus Infection in Mice
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IL-21 shapes the B cell response in a context-dependent manner.

Youngjun Kim1, Francesca Manara2, Simon Grassmann3

  • 1Immunology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA; Immunology and Microbial Pathogenesis Program, Weill Cornell Graduate School of Medical Sciences, New York, NY 10065, USA.

Cell Reports
|January 10, 2025
PubMed
Summary

Interleukin-21 (IL-21) has dual roles in B cells, inducing apoptosis in naive cells but promoting proliferation in pre-activated cells, especially IgG1+ B cells. This cytokine is critical for germinal center responses and antibody production.

Keywords:
B cellCP: ImmunologyIL-21class-switchinggerminal centershumoral immunitysomatic hypermutation

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • The cytokine Interleukin-21 (IL-21) is known to be important for germinal center (GC) responses.
  • However, its specific functions in B cell biology remain unclear.

Purpose of the Study:

  • To elucidate the precise role of IL-21 in regulating B cell fate, including apoptosis and proliferation.
  • To investigate the context-dependent effects of IL-21 on different B cell populations.

Main Methods:

  • Utilized conditional knockout mice lacking the IL-21 receptor (Il21r) specifically in B cells.
  • Employed ex vivo culture systems to analyze B cell responses.
  • Assessed in vivo immune responses following immunization.

Main Results:

  • IL-21 exhibited dual effects: inducing apoptosis in naive B cells via STAT3 and promoting proliferation in pre-activated B cells, particularly IgG1+ cells.
  • B-cell-specific Il21r deletion impaired IgG1 antibody responses and disrupted the transition from pre-GC to GC stages.
  • Il21r deficiency reduced IgG1+ plasmablasts/plasma cells, despite not altering IgG1+ GC B cell proportions.

Conclusions:

  • IL-21 acts as a critical regulator of B cell differentiation and survival.
  • The function of IL-21 in B cells is context-dependent, affecting apoptosis and proliferation differently based on cell activation status.
  • IL-21 is essential for effective IgG1 responses and the generation of antibody-secreting cells.