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Related Concept Videos

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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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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Pre-division TCF1 drop determines long-term CD8 T cell fates.

Natalie R Favret1, Maider Astorkia2,3, Melissa M Wolf1

  • 1Department of Medicine, Division of Hematology and Oncology, Department of Pathology, Microbiology, and Immunology, Vanderbilt School of Medicine, Nashville, TN, USA.

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T Cell Factor 1 (TCF1) rapidly drops before CD8 T cells divide, then rebounds, influencing long-term effector cell fate. This dynamic regulation acts as a critical checkpoint in immune responses.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • T Cell Factor 1 (TCF1) is crucial for T cell development and differentiation.
  • TCF1 is downregulated during effector T cell differentiation.
  • The role of TCF1 during T cell priming before cell cycle entry was previously unknown.

Purpose of the Study:

  • To investigate the role and dynamics of TCF1 during the early stages of CD8 T cell activation.
  • To understand how TCF1 regulation impacts T cell fate decisions.

Main Methods:

  • Analysis of TCF1 expression dynamics in murine and human CD8 T cells post-antigen encounter.
  • Transcriptomic and epigenetic analyses to identify TCF1-regulated pathways.
  • siRNA-mediated TCF1 knockdown to assess functional consequences.

Main Results:

  • TCF1 expression rapidly downregulated within hours after antigen encounter, preceding cell cycle entry.
  • TCF1 levels rebound upon cell cycle entry, then decline with proliferation.
  • Pre-division TCF1 drop magnitude, influenced by TCR signaling and cytokines, regulates long-term effector and memory cell fates.
  • TCF1-regulated chromatin remodeling occurs rapidly, activating effector and inflammatory pathways.
  • Transient TCF1 downregulation before division induces long-term effector cell skewing.

Conclusions:

  • Dynamic pre-division regulation of TCF1 is a novel mechanism controlling CD8 T cell fate commitment.
  • TCF1 acts as a critical checkpoint regulating T cell responses in infection, cancer, and autoimmunity.