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Related Concept Videos

T Cell Types and Functions01:24

T Cell Types and Functions

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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 Cell Activation and Clonal Selection01:22

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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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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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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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Immunological Memory01:23

Immunological Memory

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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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Evaluation of T Follicular Helper Cells and Germinal Center Response During Influenza A Virus Infection in Mice
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IL-21 contributes to type 2 memory B cell formation.

Alexandra R Dvorscek1, Jesse Mulder1, Zhoujie Ding1

  • 1Department of Immunology, Monash University, Prahran, VIC, Australia.

Journal of Immunology (Baltimore, Md. : 1950)
|July 4, 2025
PubMed
Summary
This summary is machine-generated.

Interleukin-21 (IL-21) is essential for the formation of Type 2 memory B cells (mBC2), which are crucial in allergic responses. Its deficiency impairs mBC2 development, challenging its use as an allergy suppressor.

Keywords:
B cellsTh2allergymBC2memory

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Area of Science:

  • Immunology
  • Allergy Research
  • Cell Biology

Background:

  • Type 2 memory B cells (mBC2) are critical precursors for IgE plasma cells and play a key role in allergic diseases.
  • Interleukin-21 (IL-21) is known to be vital for general B cell differentiation, but its specific role in mBC2 formation is not understood.

Purpose of the Study:

  • To investigate the role of IL-21 signaling in the development of Type 2 memory B cells (mBC2).
  • To determine if IL-21 deficiency impacts the generation of mBC2 and subsequent antibody responses.

Main Methods:

  • Utilized IL-21 receptor-deficient (IL-21R-/-) mice immunized with ovalbumin.
  • Analyzed B cell populations, including mBC2 and germinal center B cells, using flow cytometry.
  • Assessed plasma cell generation and antibody production.

Main Results:

  • IL-21R-/- mice showed reduced numbers of ovalbumin-specific mBC2 one week post-immunization compared to controls.
  • A deficit in pre-memory B cell exit and accumulation of pre-prememory germinal center B cells were observed in IL-21R-/- mice.
  • Germinal centers in IL-21R-/- mice waned rapidly, leading to diminished mBC2 numbers and suppressed IgG1 plasma cell genesis.

Conclusions:

  • IL-21 signaling is required for the normal formation and maintenance of Type 2 memory B cells (mBC2).
  • These findings suggest that IL-21 is not a suitable target for a pan-allergy suppressor due to its essential role in mBC2 development.