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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 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

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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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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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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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.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
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Related Experiment Video

Updated: Jan 13, 2026

Studying Organelle Dynamics in B Cells During Immune Synapse Formation
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Studying Organelle Dynamics in B Cells During Immune Synapse Formation

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Mechanisms Promoting Stability of B Cells.

Vivian L S Kuan1,2, Jayanta Chaudhuri1,2

  • 1Louis V. Gerstner, Jr. Graduate School of Biomedical Sciences, Memorial Sloan Kettering Cancer Center, New York, New York, USA.

Immunological Reviews
|October 29, 2025
PubMed
Summary

B cells decide between rapid extrafollicular or germinal center responses. This review explores how DNA changes, metabolism, and IL-21 signaling influence these crucial B cell differentiation pathways.

Keywords:
B cell receptoractivation‐induced cytidine deaminaseclass switch recombinationextrafollicular responsegerminal centersmemory B cellplasma cellsomatic hypermutation

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Visualizing the Actin and Microtubule Cytoskeletons at the B-cell Immune Synapse Using Stimulated Emission Depletion STED Microscopy
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Visualizing the Actin and Microtubule Cytoskeletons at the B-cell Immune Synapse Using Stimulated Emission Depletion STED Microscopy

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

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Related Experiment Videos

Last Updated: Jan 13, 2026

Studying Organelle Dynamics in B Cells During Immune Synapse Formation
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Studying Organelle Dynamics in B Cells During Immune Synapse Formation

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Visualizing the Actin and Microtubule Cytoskeletons at the B-cell Immune Synapse Using Stimulated Emission Depletion STED Microscopy
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Visualizing the Actin and Microtubule Cytoskeletons at the B-cell Immune Synapse Using Stimulated Emission Depletion STED Microscopy

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

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • B cells differentiate into distinct antibody-producing lineages upon activation.
  • The choice between extrafollicular (EF) and germinal center (GC) responses dictates antibody affinity and longevity.
  • Class switch recombination (CSR) occurs at the B-T cell border, influencing antibody effector functions.

Purpose of the Study:

  • To review the molecular mechanisms governing B cell fate decisions.
  • To highlight the interplay of DNA deaminase AID, transcription, and nucleic acid structures in CSR.
  • To discuss metabolic and cytokine-driven factors influencing EF versus GC pathways.

Main Methods:

  • Review of existing literature on B cell differentiation, CSR, and signaling pathways.
  • Analysis of the roles of AID, transcription, and noncanonical DNA structures in CSR.
  • Examination of metabolic requirements (glycolysis) and cytokine (IL-21) effects on B cell responses.

Main Results:

  • CSR involves complex molecular mechanisms influenced by AID, transcription, and DNA structures.
  • EF and GC responses exhibit differential reliance on glycolysis.
  • The cytokine IL-21 plays a role in regulating GC entry.

Conclusions:

  • B cell fate decisions integrate genomic alterations, metabolic demands, and cytokine signaling.
  • Understanding these pathways is critical for comprehending adaptive immunity and developing targeted therapies.
  • The interplay between molecular mechanisms, metabolism, and signaling shapes B cell responses.