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Transient protein accumulation at the center of the T cell antigen-presenting cell interface drives efficient IL-2

Danielle J Clark1, Laura E McMillan1, Sin Lih Tan1

  • 1School of Cellular and Molecular Medicine, University of Bristol, Bristol, United Kingdom.

Elife
|October 31, 2019
PubMed

Insights

The central supramolecular signaling cluster (cSMAC) in T cells enhances early signaling by organizing protein interactions. It later limits signaling by sequestering key molecules, impacting T cell effector functions like IL-2 secretion.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Supramolecular signaling assemblies, such as the central supramolecular signaling cluster (cSMAC), are crucial for T cell activation.
  • The cSMAC forms at the interface between T cells and antigen-presenting cells and is involved in signal transduction.

Purpose of the Study:

  • To investigate the functional role of the cSMAC in T cell signaling.
  • To determine how the localization of adaptor proteins (LAT, SLP-76, Grb2) within the cSMAC affects T cell activation and effector functions.

Main Methods:

  • Systematic manipulation of adaptor protein localization within the cSMAC.
  • Assessment of cSMAC formation under conditions of CD28 blockade and Itk deficiency.
  • Measurement of IL-2 secretion as a key T cell effector function.

Main Results:

  • cSMAC localization varied among adaptor proteins (LAT, SLP-76, Grb2).
  • cSMAC localization was reduced by CD28 blockade and Itk deficiency.
  • Restoring cSMAC localization recovered IL-2 secretion, demonstrating its role in T cell effector function.

Conclusions:

  • The cSMAC dynamically regulates T cell signaling, enhancing initial interactions and subsequently attenuating signaling through sequestration.
  • This dynamic regulation is critical for controlling T cell effector functions, including IL-2 production.

Keywords:
T lymphocytescell biologyimagingimmunologyinflammationmousesignal transductionsupramolecular protein complex

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