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Related Concept Videos

Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

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,...
B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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...
T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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...
Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

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...
Primary Lymphoid Organs01:16

Primary Lymphoid Organs

Primary lymphoid organs are pivotal in the formation, development, and maturation of lymphocytes, the white blood cells that serve as the backbone of our immune system. This crucial function underscores their fundamental role in maintaining our overall health and immunity. The two primary lymphoid organs of prime importance are the red bone marrow and the thymus.
The red bone marrow is a soft, spongy tissue nestled in the interior of long bones such as the humerus and femur. It is the site...
Development of Immunocompetence01:22

Development of Immunocompetence

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.
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...

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Related Experiment Video

Updated: May 24, 2026

Examination of Thymic Positive and Negative Selection by Flow Cytometry
14:29

Examination of Thymic Positive and Negative Selection by Flow Cytometry

Published on: October 8, 2012

Central B-cell tolerance: where selection begins.

Roberta Pelanda1, Raul M Torres

  • 1Integrated Department of Immunology, National Jewish Health and University of Colorado Denver School of Medicine, Denver, Colorado 80206, USA. pelandar@njhealth.org

Cold Spring Harbor Perspectives in Biology
|March 2, 2012
PubMed
Summary
This summary is machine-generated.

The immune system eliminates self-reactive B cells during development. Sophisticated mouse models reveal central tolerance mechanisms that ensure a functional B-cell repertoire, preventing autoimmunity while maintaining foreign antigen response.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Developmental Biology

Background:

  • Adaptive immunity relies on B cells with diverse antigen receptors.
  • Random receptor generation necessitates mechanisms to prevent self-reactivity (autoimmunity).
  • Central tolerance in B cells is critical for a functional immune system.

Purpose of the Study:

  • To elucidate the central tolerance mechanisms governing B-cell development.
  • To understand how autoreactive B cells are eliminated during development.
  • To identify processes ensuring positive selection of non-autoreactive B cells.

Main Methods:

  • Utilized sophisticated mouse models to study B-cell selection.
  • Investigated negative selection of autoreactive immature B cells.
  • Examined mechanisms of positive selection and differentiation for non-autoreactive B cells.

Main Results:

  • Identified key central tolerance mechanisms that eliminate self-reactive B cells.
  • Demonstrated prevention of autoreactive B cells entering the peripheral pool.
  • Uncovered pathways promoting differentiation and positive selection of useful B cells.

Conclusions:

  • Central tolerance mechanisms are fundamental for generating a safe B-cell repertoire.
  • These processes ensure the naïve B-cell pool is largely self-tolerant.
  • The system effectively balances self-tolerance with responsiveness to foreign antigens.