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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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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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Receptor tyrosine kinases or RTKs are membrane-bound receptors that phosphorylate specific tyrosine on protein substrates. RTKs regulate cellular growth, differentiation, survival, and migration. They contain an extracellular ligand binding domain, a transmembrane domain, and a cytosolic tail with intrinsic kinase activity. Several extracellular signaling molecules activate RTKs in one or more ways and relay the signal downstream. Ligands such as platelet-derived growth factor (PDGF) or...
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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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Updated: Dec 28, 2025

Spatial and Temporal Control of T Cell Activation Using a Photoactivatable Agonist
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Structural understanding of T cell receptor triggering.

Xinyi Xu1, Hua Li1, Chenqi Xu2,3

  • 1State Key Laboratory of Molecular Biology, Shanghai Science Research Center, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences; University of Chinese Academy of Sciences, 320 Yueyang Road, 200031, Shanghai, China.

Cellular & Molecular Immunology
|February 13, 2020
PubMed
Summary
This summary is machine-generated.

The T cell receptor (TCR) complex structure and triggering remain complex. This review synthesizes structural studies to discuss the role of conformational changes in TCR signaling, a key process in immune responses.

Keywords:
Conformational changeStructureT Cell ReceptorTriggering

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Area of Science:

  • Immunology
  • Molecular Biology
  • Structural Biology

Background:

  • The T cell receptor (TCR) complex is crucial for adaptive immunity, mediating antigen recognition and initiating T cell activation.
  • The TCR is an octameric complex composed of the antigen-binding TCRαβ heterodimer and three invariant CD3 signaling modules (CD3ζζ, CD3δε, CD3γε).
  • TCR triggering involves ligand binding, leading to phosphorylation of immunoreceptor tyrosine-based activation motifs (ITAMs) within CD3 cytoplasmic domains and subsequent intracellular signaling.

Purpose of the Study:

  • To synthesize structural studies of the TCR complex.
  • To critically evaluate the relevance of the conformational change model in TCR triggering and transmembrane signal transduction.

Main Methods:

  • Review and synthesis of existing structural biology data.
  • Analysis of diverse biochemical and biophysical studies on TCR structure and function.

Main Results:

  • TCR structure and triggering mechanisms are complex and have been studied for decades.
  • The role of conformational changes in TCR-mediated signal transduction remains a subject of ongoing debate.

Conclusions:

  • Understanding TCR structure and triggering is vital for deciphering immune responses.
  • Further investigation into conformational dynamics is necessary to fully elucidate TCR signal transduction pathways.