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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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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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The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
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Developing T cells form an immunological synapse for passage through the β-selection checkpoint.

Amr H Allam1,2, Mirren Charnley1,2, Kim Pham1,2,3

  • 1Optical Sciences Centre, Faculty of Science, Engineering & Technology, Swinburne University of Technology, Hawthorn, Victoria, Australia.

The Journal of Cell Biology
|January 19, 2021
PubMed
Summary

Developing T cells form an immunological synapse at the β-selection checkpoint, integrating signals from Notch and CXCR4 pathways. This synapse promotes T cell receptor signaling, enabling T cell development.

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Area of Science:

  • Immunology
  • Cell Biology
  • Developmental Biology

Background:

  • The β-selection checkpoint is crucial for T cell development, ensuring the production of a functional T cell receptor β (TCRβ).
  • Successful passage requires the nascent TCRβ protein to signal through a pre-TCR complex.

Purpose of the Study:

  • To investigate the role of the immunological synapse in T cell development at the β-selection checkpoint.
  • To determine how signaling pathways like Notch and CXCR4 interact with the synapse to facilitate T cell maturation.

Main Methods:

  • In vitro and in situ analyses of developing T cells.
  • Examination of immunological synapse formation and its dependence on Notch and CXCR4 signaling.

Main Results:

  • Developing T cells at the β-selection checkpoint form an immunological synapse, similar to mature T cells.
  • The formation and function of this synapse depend on Notch and CXCR4 signaling pathways.
  • The immunological synapse was shown to promote passage through the β-selection checkpoint.

Conclusions:

  • Developing T cells utilize an immunological synapse to regulate pre-TCR signaling during the β-selection checkpoint.
  • This signaling platform integrates signals from Notch, CXCR4, and MHC on thymic stromal cells, facilitating T cell transition.