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Related Experiment Videos

T-cell antigen-receptor stoichiometry: pre-clustering for sensitivity.

Balbino Alarcón1, Mahima Swamy, Hisse M van Santen

  • 1Centro de Biología Molecular Severo Ochoa, CSIC-Universidad Autónoma de Madrid, Madrid 28049, Spain.

EMBO Reports
|May 4, 2006
PubMed
Summary

The T-cell receptor (TCR x CD3) exists in monovalent and multivalent forms on T cells. This explains how T cells detect antigens across a wide concentration range, maintaining sensitivity and dynamic range.

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Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • The T-cell receptor (TCR x CD3) complex initiates adaptive immune responses.
  • Its structure is crucial for understanding T-cell sensitivity and response range.
  • Paradoxical properties include high specificity, low affinity, and wide concentration response.

Purpose of the Study:

  • To review new evidence on TCR x CD3 stoichiometry and architecture.
  • To explain the functional implications of different TCR x CD3 forms.
  • To propose a model for TCR x CD3 function in T-cell activation.

Main Methods:

  • Review of existing literature and new evidence.
  • Analysis of TCR x CD3 forms on intact T cells.
  • Comparison with stoichiometries determined by biochemical methods.

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Main Results:

  • TCR x CD3 exists as monovalent and distinct multivalent forms on unstimulated T cells.
  • Biochemical methods may alter TCR x CD3 integrity due to detergent effects.
  • A model is proposed explaining the roles of different forms.

Conclusions:

  • Multivalent TCR x CD3 enhances sensitivity to low ligand concentrations.
  • Monovalent TCR x CD3 contributes to a wide dynamic response range.
  • The stoichiometry and architecture of TCR x CD3 are key to its paradoxical properties.