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A THEMIS:SHP1 complex promotes T-cell survival.

Wolfgang Paster1, Annika M Bruger2, Kristin Katsch2

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The THEMIS protein complex dampens T-cell receptor (TCR) signaling, promoting T-cell survival. This discovery reveals a new molecular mechanism crucial for T-cell development and differentiation.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Signaling

Background:

  • The precise molecular function of THEMIS in T-cell development is not fully understood.
  • THEMIS is known to be critical for conventional T-cell development.

Purpose of the Study:

  • To elucidate the molecular function of THEMIS in T-cell signaling.
  • To investigate the interaction of THEMIS with phosphatases SHP1 and SHP2.
  • To understand the role of the THEMIS:SHP complex in T-cell survival and development.

Main Methods:

  • Co-immunoprecipitation assays to identify protein interactions.
  • T-cell receptor (TCR) stimulation assays in cells with THEMIS knockdown.
  • Analysis of T-cell signaling pathways, including phosphorylation and gene expression.
  • In vivo studies using knock-in mouse models.

Main Results:

  • THEMIS constitutively associates with SHP1 and SHP2 phosphatases via the adapter protein GRB2.
  • THEMIS recruits SHP phosphatases to the TCR signalosome, dampening TCR signaling.
  • Knockdown of THEMIS or SHP1 leads to increased TCR signaling and augmented apoptosis.
  • A specific LCK mutation did not affect TCR signaling or ligand discrimination in vivo.

Conclusions:

  • The THEMIS:SHP complex acts as a negative regulator of early TCR signaling through a novel mechanism.
  • This regulatory pathway is essential for promoting T-cell survival.
  • The findings provide insights into T-cell development and differentiation modulation.