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Related Concept Videos

Lineage Commitment01:21

Lineage Commitment

Commitment is the  process whereby stem cells:
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...
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...
Differentiation of Common Myeloid Progenitor Cells01:15

Differentiation of Common Myeloid Progenitor Cells

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...
T Cell Types and Functions01:24

T Cell Types and Functions

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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Related Experiment Video

Updated: Jun 29, 2026

Characterization of Thymic Settling Progenitors in the Mouse Embryo Using In Vivo and In Vitro Assays
08:56

Characterization of Thymic Settling Progenitors in the Mouse Embryo Using In Vivo and In Vitro Assays

Published on: June 9, 2015

Progenitor migration to the thymus and T cell lineage commitment.

Arivazhagan Sambandam1, J Jeremiah Bell, Benjamin A Schwarz

  • 1Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA, 19104, USA.

Immunologic Research
|October 2, 2008
PubMed
Summary

Hematopoietic stem cells (HSCs) in bone marrow develop into T cells in the thymus. Understanding this process aids in treating T cell cancers, improving bone marrow transplants, and addressing immune aging.

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Last Updated: Jun 29, 2026

Characterization of Thymic Settling Progenitors in the Mouse Embryo Using In Vivo and In Vitro Assays
08:56

Characterization of Thymic Settling Progenitors in the Mouse Embryo Using In Vivo and In Vitro Assays

Published on: June 9, 2015

Isolation and Ex Vivo Culture of Vδ1+CD4+γδ T Cells, an Extrathymic αβT-cell Progenitor
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Isolation and Ex Vivo Culture of Vδ1+CD4+γδ T Cells, an Extrathymic αβT-cell Progenitor

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07:12

Mouse Naïve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets

Published on: April 16, 2015

Area of Science:

  • Immunology
  • Developmental Biology
  • Gerontology

Background:

  • T cells are crucial for adaptive immunity and originate from hematopoietic stem cells (HSCs) in the bone marrow.
  • The thymus is the primary site for T cell maturation and selection.
  • Aging impacts thymic function, affecting T cell output and immune surveillance.

Purpose of the Study:

  • To summarize current knowledge on early T cell development from HSCs.
  • To review the relationship between T cell development and thymic aging.
  • To identify key unresolved questions in these interconnected fields.

Main Methods:

  • Literature review and synthesis of existing research.
  • Analysis of developmental pathways from HSCs to T cells.
  • Examination of age-related changes in thymic cellularity and function.

Main Results:

  • HSCs are the definitive precursors for all T cells.
  • Distinct stages characterize T cell commitment and differentiation within the thymus.
  • Thymic involution with age leads to reduced naive T cell production.

Conclusions:

  • Understanding early T cell development is vital for clinical applications like bone marrow transplantation and managing T cell malignancies.
  • Thymic aging presents significant challenges for maintaining T cell immunity throughout life.
  • Further research is needed to address critical gaps in our knowledge of T cell development and thymic aging.