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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.
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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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Related Experiment Video

Updated: Jun 4, 2026

Murine Superficial Lymph Node Surgery
04:36

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Published on: May 21, 2012

Alternative memory in the CD8 T cell lineage.

You Jeong Lee1, Stephen C Jameson, Kristin A Hogquist

  • 1The Department of Laboratory Medicine and Pathology, Center for Immunology, University of Minnesota, Minneapolis, MN, USA.

Trends in Immunology
|February 4, 2011
PubMed
Summary
This summary is machine-generated.

Innate CD8+ T cells develop in the thymus without antigen exposure, mimicking memory cells. The cytokine Interleukin-4 (IL-4) is surprisingly crucial for this development in mice and humans.

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Area of Science:

  • Immunology
  • T cell biology
  • Innate immunity

Background:

  • A subset of CD8+ T cells with memory characteristics arises in the thymus independently of antigen exposure.
  • This phenomenon is observed in specific gene-deficient mouse models (Itk, KLF2, CBP, Id3).
  • The cytokine Interleukin-4 (IL-4) has been identified as a key factor in this developmental pathway.

Purpose of the Study:

  • To review the developmental mechanisms of innate CD8+ T cells.
  • To compare and contrast these cells with conventional CD8+ memory T cells.
  • To explore the potential physiological roles of innate CD8+ T cells.

Main Methods:

  • Review of existing literature on T cell development and innate immunity.
  • Analysis of data from gene-deficient mouse models.
  • Comparative analysis of cell phenotypes and functions.

Main Results:

  • Innate CD8+ T cells develop in the thymus, exhibiting memory cell phenotype and function without prior antigen encounter.
  • IL-4 is essential for the development of these cells.
  • These cells are present not only in specific mouse models but also in normal mice and humans.

Conclusions:

  • Innate CD8+ T cells represent a distinct T cell population with unique developmental pathways.
  • Their development is regulated by factors like IL-4, independent of traditional antigen-driven activation.
  • Further research is warranted to fully elucidate their physiological significance and potential therapeutic applications.