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Pre-TCR ligand binding impacts thymocyte development before αβTCR expression.

Robert J Mallis1, Ke Bai2, Haribabu Arthanari1

  • 1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115;

Proceedings of the National Academy of Sciences of the United States of America
|June 10, 2015
PubMed
Summary

The pre-T-cell receptor (preTCR) initiates adaptive immunity by binding self peptides on MHC molecules, guiding early T-cell selection. This finding reveals a sequential process of T-cell receptor repertoire tuning during thymic development.

Keywords:
NMR spectroscopybiomembrane force probepre–T-cell receptorrepertoire selectionthymic development

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Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Biology

Background:

  • Adaptive cellular immunity relies on distinguishing self from non-self to prevent infections and autoimmunity.
  • T-cell receptor (TCR) selection in the thymus is crucial for this discrimination, primarily involving alpha-beta TCRs (αβTCRs).
  • The pre-TCR (preTCR), expressed before αβTCR, was thought to function independently of ligands.

Purpose of the Study:

  • To investigate the function of the pre-TCR in T-cell repertoire selection.
  • To determine if the pre-TCR interacts with peptide-MHC (pMHC) complexes.
  • To elucidate the role of preTCR-pMHC interactions in early thymocyte development.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy to analyze preTCR structure and binding.
  • Bio-force probe assays to measure the force-dependent interactions of preTCR with pMHC.
  • Calcium flux measurements to assess signaling downstream of preTCR engagement.

Main Results:

  • The preTCR's beta-subunit directly binds pMHC using its Vβ complementarity-determining regions and a specific hydrophobic patch.
  • These interactions form force-regulated single bonds, similar to αβTCRs but with broader ligand specificity.
  • PreTCR binding to self pMHC triggers calcium flux, indicating a ligand-dependent signaling role.

Conclusions:

  • The preTCR actively participates in an initial phase of T-cell repertoire selection by interacting with self pMHC.
  • This preTCR-mediated selection precedes and influences the later αβTCR selection process.
  • These findings reframe thymic development as a sequential tuning of the T-cell repertoire, starting with β-selection.