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Related Concept Videos

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.
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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.
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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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T Cell Types and Functions01:24

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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.
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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.
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T Cell Activation and Clonal Selection01:22

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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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Related Experiment Video

Updated: Feb 24, 2026

Preparation of Single-Cell Suspension of Mouse Thymic Epithelial Cells and Staining of Intracellular Molecules for Flow Cytometric AnalysisMechanisms
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Redefining thymus medulla specialization for central tolerance.

Emilie J Cosway1, Beth Lucas1, Kieran D James1

  • 1Institute for Immunology and Immunotherapy, College of Medical and Dental Sciences, Medical School, University of Birmingham, Birmingham, England, UK.

The Journal of Experimental Medicine
|August 24, 2017
PubMed
Summary
This summary is machine-generated.

Thymic tolerance mechanisms are independent of medulla organogenesis. Lymphotoxin β receptor (LTβR) regulates dendritic cell populations crucial for T cell tolerance, not mTEC development.

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Area of Science:

  • Immunology
  • Developmental Biology
  • Cell Biology

Background:

  • The thymus medulla is crucial for T cell tolerance, involving medullary thymic epithelial cell (mTEC) networks that support negative selection and T-regulatory cell (T-reg) development.
  • The organized topology of the thymus medulla, including branching mTEC networks, is thought to be essential for its specialized function in T cell tolerance.

Purpose of the Study:

  • To investigate whether thymic tolerance mechanisms are dependent on lymphotoxin β receptor (LTβR)-mediated medullary thymic epithelial cell (mTEC) development and organization.
  • To determine the role of LTβR in the regulation of intrathymic self-antigens and T-regulatory cell development.
  • To elucidate the mechanism by which LTβR controls thymic tolerance.

Main Methods:

  • TEC-specific deletion of the lymphotoxin β receptor (LTβR) in mice.
  • Analysis of mTEC development, organization, and expression of key regulators (Fezf2, Aire).
  • Assessment of T-regulatory cell development and intrathymic dendritic cell (DC) populations.

Main Results:

  • Thymic tolerance mechanisms and T-regulatory cell development proceed independently of LTβR-mediated medulla organogenesis.
  • mTECs maintain expression of Fezf2 and Aire, and support T-reg development even without LTβR-mediated medulla organization.
  • LTβR regulates the frequency and composition of intrathymic dendritic cells (DCs) essential for thymocyte negative selection.

Conclusions:

  • Thymus medulla specialization for T cell tolerance is separable from medulla organogenesis.
  • LTβR plays a critical role in thymic tolerance by modulating the thymic DC pool, rather than by controlling mTEC development or organization.
  • These findings reveal a novel mechanism for regulating T cell tolerance within the thymus.