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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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Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
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Related Experiment Video

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A TIRF Microscopy Technique for Real-time, Simultaneous Imaging of the TCR and its Associated Signaling Proteins
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TCR Signal Strength and T Cell Development.

Nicholas R J Gascoigne1, Vasily Rybakin2, Oreste Acuto3

  • 1Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, and Immunology Program, National University of Singapore, Singapore 11759;

Annual Review of Cell and Developmental Biology
|October 8, 2016
PubMed
Summary

Thymocyte selection refines T cell receptors (TCRs) to prevent autoimmunity while enabling pathogen recognition. This review details factors modulating TCR signal strength during thymocyte development.

Keywords:
T cell developmentT cell receptorThemissignalingthymus

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Area of Science:

  • Immunology
  • Cellular signaling

Background:

  • T-cell development in the thymus is crucial for adaptive immunity.
  • Thymocyte selection ensures T cells recognize foreign antigens without attacking self-tissues.
  • T-cell receptor (TCR) signaling strength dictates thymocyte fate (survival, apoptosis, differentiation).

Purpose of the Study:

  • To review the molecular mechanisms regulating TCR signal strength during thymocyte selection.
  • To highlight factors influencing the analog TCR recognition event and its digital signaling outcomes.

Main Methods:

  • This is a review article, synthesizing existing research.
  • Analysis of signaling pathways downstream of the TCR.
  • Examination of molecular regulators of TCR signal transduction.

Main Results:

  • TCR signal strength is modulated by numerous molecules at various cascade points.
  • Both positive and negative selection rely on precise TCR signal strength thresholds.
  • The outcome of TCR signaling is not analog, despite the analog nature of TCR recognition.

Conclusions:

  • Understanding TCR signal regulation is key to comprehending thymocyte development.
  • Dysregulation of TCR signaling can lead to immune disorders.
  • Further research into TCR signal modulators may offer therapeutic targets.