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Related Concept Videos

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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Diversity of Antigen Receptors01:28

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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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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.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
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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.
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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Related Experiment Video

Updated: Oct 28, 2025

Examination of Thymic Positive and Negative Selection by Flow Cytometry
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Examination of Thymic Positive and Negative Selection by Flow Cytometry

Published on: October 8, 2012

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New insights into TCR β-selection.

Avik Dutta1, Bin Zhao2, Paul E Love1

  • 1Section on Hematopoiesis and Lymphocyte Biology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA.

Trends in Immunology
|July 15, 2021
PubMed
Summary

T cell receptor beta-selection is a critical checkpoint in T cell development. Recent findings reveal new molecular insights into this process, crucial for T cell lineage commitment and proliferation.

Keywords:
Notchdevelopmenthematopoiesispre-TCRthymus

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Area of Science:

  • Immunology
  • Developmental Biology
  • Molecular Biology

Background:

  • T cell receptor (TCR) beta-selection is a pivotal checkpoint in mammalian T cell development.
  • This process occurs when immature CD4-CD8- T-cells (thymocytes) express pre-TCR after successful Tcrb gene rearrangement.
  • Beta-selection involves alpha-beta T cell lineage commitment, allelic exclusion, and thymocyte proliferation.

Purpose of the Study:

  • To review recent mechanistic findings in T cell receptor beta-selection.
  • To provide a detailed decoding of the molecular dynamics of the beta-selection checkpoint.
  • To elucidate the role of beta-selection in early T cell development.

Main Methods:

  • Literature review of recent mechanistic findings.
  • Analysis of molecular dynamics in T cell development.
  • Synthesis of current understanding of beta-selection.

Main Results:

  • Beta-selection is critically dependent on synchronized Notch and pre-TCR signaling.
  • Other necessary inputs for beta-selection have been identified over the past decade.
  • Recent findings expand the understanding of the molecular dynamics and role of beta-selection.

Conclusions:

  • Recent mechanistic findings have advanced the understanding of T cell receptor beta-selection.
  • A more detailed decoding of molecular dynamics has been achieved.
  • The role of beta-selection in early T cell development is better elucidated.