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Related Concept Videos

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...
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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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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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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.
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Preparation and Applications of Organotypic Thymic Slice Cultures
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Post-thymic maturation: young T cells assert their individuality.

Pamela J Fink1, Deborah W Hendricks

  • 1Department of Immunology, University of Washington, Seattle, Washington, USA. pfink@u.washington.edu

Nature Reviews. Immunology
|July 23, 2011
PubMed
Summary
This summary is machine-generated.

Newly identified T cells, called recent thymic emigrants (RTEs), continue maturing after leaving the thymus. This post-thymic maturation is crucial for ensuring T cell function and self-tolerance, especially in newborns and during immune recovery.

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Area of Science:

  • Immunology
  • T cell biology
  • Developmental immunology

Background:

  • T cell maturation was traditionally believed to be confined to the thymus.
  • Emerging evidence suggests a distinct population of immature T cells exists in the periphery.
  • These cells are known as recent thymic emigrants (RTEs).

Purpose of the Study:

  • To investigate the phenomenon of post-thymic T cell maturation.
  • To understand the clinical relevance of RTEs in specific physiological states.
  • To explore the role of post-thymic maturation in T cell fitness and self-tolerance.

Main Methods:

  • Monitoring of cell phenotype in recent thymic emigrants (RTEs).
  • Assessment of immune function in RTEs.
  • Comparative analysis of T cells in different physiological conditions (neonates, lymphopenic recovery).

Main Results:

  • Recent thymic emigrants (RTEs) represent a unique population of immature peripheral T cells.
  • RTEs undergo a significant maturation process after thymic egress.
  • This post-thymic maturation influences T cell phenotype and immune function.

Conclusions:

  • T cell maturation extends beyond the thymus, involving a critical post-thymic phase.
  • Recent thymic emigrants (RTEs) play a key role in immune reconstitution and development.
  • Understanding RTE maturation is vital for clinical applications, particularly in neonates and during recovery from lymphopenia, to ensure T cell competence and prevent autoimmunity.