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Related Concept Videos

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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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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Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
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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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Related Experiment Video

Updated: Sep 22, 2025

Characterization of Thymic Settling Progenitors in the Mouse Embryo Using In Vivo and In Vitro Assays
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Developmental dynamics of two bipotent thymic epithelial progenitor types.

Anja Nusser1, Sagar2,3, Jeremy B Swann1

  • 1Department of Developmental Immunology, Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany.

Nature
|May 25, 2022
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Summary

Researchers identified two main types of thymic epithelial progenitors, crucial for T cell development. This discovery offers insights into thymus dynamics and potential strategies for enhancing immune function.

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Area of Science:

  • Immunology
  • Developmental Biology
  • Cell Biology

Background:

  • Thymus T cell development is vital for immunity and relies on the thymic epithelial microenvironment.
  • The thymus exhibits dynamic changes in size and cellularity throughout life, impacting T cell production.
  • Previous studies using single-cell RNA sequencing revealed thymic epithelial cell heterogeneity, but progenitor identities remain unclear.

Purpose of the Study:

  • To identify and characterize epithelial progenitor populations in the thymus.
  • To understand the developmental dynamics of the thymic epithelium over time.
  • To explore strategies for modulating thymopoietic activity.

Main Methods:

  • Combined single-cell RNA sequencing (scRNA-seq) with a CRISPR-Cas9-based cellular barcoding system in mice.
  • Analyzed qualitative and quantitative changes in the thymic epithelium.
  • Investigated the role of Fgf7 in thymic microenvironment expansion.

Main Results:

  • Identified two principal bipotent progenitor populations: one biased towards cortical epithelium and another towards medullary epithelium.
  • Characterized distinct early and postnatal progenitor populations.
  • Demonstrated that sustained autocrine Fgf7 signaling promotes thymic microenvironment expansion without progenitor exhaustion.

Conclusions:

  • The study resolves the identities and developmental dynamics of thymic epithelial progenitors.
  • Findings reveal distinct progenitor populations governing cortical and medullary development.
  • Suggests Fgf7 as a potential therapeutic target for modulating thymopoietic activity and immune function.