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[T cell antigen receptor--structure, expression and function].

T Saito1

  • 1Division of Molecular Genetics, School of Medicine, Chiba University, Japan.

Human Cell
|October 1, 1990
PubMed
Summary

The T cell receptor (TCR) complex, crucial for adaptive immunity, has diverse forms including alpha beta and gamma delta. Further research is needed to understand novel TCR heterodimers and their roles in T cell activation and selection.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Context:

  • The T cell receptor (TCR) complex is a sophisticated molecular machine essential for adaptive immunity.
  • It comprises multiple polypeptide chains, including alpha beta and gamma delta T cell receptor types, associated with invariant CD3 complexes.
  • While alpha beta TCR function is understood in antigen recognition, gamma delta TCR specificity and function remain largely unknown.

Purpose:

  • To explore the structural diversity and functional implications of various T cell receptor (TCR) heterodimers.
  • To investigate the role of CD3 complex chains, particularly zeta and eta, in TCR-mediated signal transduction.
  • To elucidate the molecular mechanisms underlying T cell activation and thymocyte selection involving TCR signaling.

Summary:

  • The study reviews the composition and known types of T cell receptors (TCRs), including alpha beta and gamma delta, and their association with CD3 complexes.
  • It highlights emerging data on novel TCR heterodimers (e.g., beta delta, beta homodimers) and emphasizes the need for their characterization.
  • Key signaling molecules like zeta and eta chains, and the tyrosine kinase fyn, are implicated in early T cell activation events following antigen recognition.

Impact:

  • Characterizing novel TCRs and their associated signaling pathways will deepen our understanding of immune responses.
  • Insights into TCR-CD3 complex function can inform strategies for modulating T cell activity in autoimmune diseases and cancer immunotherapy.
  • Elucidating T cell selection mechanisms is fundamental for understanding lymphocyte development and preventing immune dysregulation.

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