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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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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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Cytotoxic T Cells-mediated Immune Response01:27

Cytotoxic T Cells-mediated Immune Response

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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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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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Primary Lymphoid Organs01:16

Primary Lymphoid Organs

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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...
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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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Preselection CD4+CD8+ thymocytes modulate TCR responsiveness following TCRβ selection.

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Related Experiment Video

Updated: Mar 22, 2026

Preparation and Applications of Organotypic Thymic Slice Cultures
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T-cell selection in the thymus: a spatial and temporal perspective.

Nadia Kurd1, Ellen A Robey1

  • 1Division of Immunology and Pathogenesis, Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA, 94720, USA.

Immunological Reviews
|April 19, 2016
PubMed
Summary
This summary is machine-generated.

Understanding T-cell selection in the thymus requires knowing how thymocytes migrate and interact with self-peptides. New microscopy techniques reveal the spatial and temporal dynamics crucial for T-cell development and self-tolerance.

Keywords:
T-cell antigen receptorcell differentiationchemokineslineage commitment/specificationthymus

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Related Experiment Videos

Last Updated: Mar 22, 2026

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Examination of Thymic Positive and Negative Selection by Flow Cytometry
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Area of Science:

  • Immunology
  • Cell Biology
  • Developmental Biology

Background:

  • T-cell selection in the thymus dictates self-tolerance.
  • The spatial and temporal dynamics of T-cell selection are poorly understood.
  • Thymocytes migrate through distinct microenvironments during development.

Purpose of the Study:

  • To investigate the spatial and temporal aspects of T-cell selection.
  • To understand how thymocytes encounter self-peptide MHC ligands during development.
  • To elucidate the mechanisms of T-cell development and self-tolerance.

Main Methods:

  • Utilized two-photon time-lapse microscopy to visualize thymocyte migration and signaling.
  • Employed a living thymic slice preparation for in situ T-cell selection studies.
  • Integrated live imaging with a synchronized experimental model.

Main Results:

  • Visualized dynamic thymocyte migration patterns within the thymus.
  • Identified specific microenvironments and cell interactions during T-cell selection.
  • Provided insights into the timing and location of self-peptide MHC ligand encounters.

Conclusions:

  • Advances in imaging reveal critical spatial and temporal dynamics of T-cell selection.
  • Understanding thymocyte migration and ligand interactions is key to T-cell development.
  • This research enhances our knowledge of how the immune system distinguishes self from non-self.