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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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Special Features of Adaptive Immunity01:20

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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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Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
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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.
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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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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.
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Related Experiment Video

Updated: Sep 14, 2025

Examination of Thymic Positive and Negative Selection by Flow Cytometry
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Self-Antigens Select B Cells: A New Perspective on B Cell Selection and Function.

Mike Aoun1, Rikard Holmdahl2,3

  • 1Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden.

European Journal of Immunology
|July 23, 2025
PubMed
Summary

B suppressor cells (Bsup) actively regulate immune homeostasis by engaging regulatory T cells (Tregs). Understanding Bsup mechanisms could revolutionize autoimmune disease treatment by harnessing autoreactivity for immunotherapy.

Keywords:
B cell developmentautoimmunityimmune regulationinflammationself/non‐self discrimination

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Related Experiment Videos

Last Updated: Sep 14, 2025

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Detection and Enrichment of Rare Antigen-specific B Cells for Analysis of Phenotype and Function
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Area of Science:

  • Immunology
  • Autoimmunity
  • Cellular Regulation

Background:

  • Self-recognition shapes the adaptive immune system, creating a paradox where autoreactivity is crucial for regulation but implicated in autoimmune diseases.
  • B cell selection in bone marrow (BM) was traditionally viewed as negative selection, eliminating harmful clones.
  • Emerging evidence suggests a subset of B suppressor cells (Bsup) actively regulate immune homeostasis.

Purpose of the Study:

  • To investigate the role and mechanisms of B suppressor cells (Bsup) in immune regulation and tolerance.
  • To explore how Bsup distinguish between homeostatic and pathogenic autoreactivity.
  • To identify potential therapeutic targets for autoimmune diseases by understanding Bsup function.

Main Methods:

  • The study focuses on C1-specific Bsup cells that recognize collagen type II (Col2).
  • Investigates the interaction between Bsup cells and Col2-specific regulatory T cells (Tregs).
  • Examines the molecular mechanisms governing Bsup selection, differentiation, and function (though specific methods are not detailed in the abstract).

Main Results:

  • C1-specific Bsup cells engage Col2-specific Tregs to suppress inflammation in healthy individuals.
  • Bsup cells appear to play a role in both peripheral and central tolerance, similar to Tregs.
  • The molecular mechanisms underlying Bsup selection, differentiation, and function are currently unknown.

Conclusions:

  • B suppressor cells (Bsup) are key regulators of immune homeostasis, interacting with regulatory T cells (Tregs).
  • Understanding Bsup function could shift autoimmune disease treatment from elimination to harnessing autoreactivity.
  • Further research into Bsup molecular mechanisms is needed for precision immunotherapy development.