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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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Updated: Jun 9, 2025

Measuring Mitochondrial Function of Naïve and Effector CD8 T Cells
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Sphingosine-1-Phosphate Signalling Inhibition Suppresses Th1-Like Treg Generation by Reversing Mitochondrial

Rachel Coulombeau1, Claudia Selck1, Nicolas Giang1

  • 1Department of Infectious Disease, Faculty of Medicine, Imperial College London, London, UK.

Immunology
|October 24, 2024
PubMed
Summary

Sphingosine-1-phosphate (S1P) inhibition, using Fingolimod (FTY720), prevents the development of dysfunctional T-regulatory cells (Tregs) and restores their function. This approach targets mitochondrial changes crucial for Treg reprogramming in autoimmune diseases like multiple sclerosis.

Keywords:
EAE/MSTregautoimmunity

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Area of Science:

  • Immunology
  • Cell Biology
  • Neuroimmunology

Background:

  • Inflammatory conditions promote the development of dysfunctional T-regulatory cells (Tregs) expressing IFNγ, T-bet, and FOXP3, which are implicated in autoimmune diseases such as multiple sclerosis (MS).
  • The molecular mechanisms governing the generation of these Th1-like Tregs remain largely unknown.
  • Sphingosine-1-phosphate (S1P) signaling is upregulated in Th1-like Tregs, and in vivo S1P inhibition with Fingolimod (FTY720) affects Treg plasticity in MS patients.

Purpose of the Study:

  • To elucidate the mechanisms by which S1P signaling influences Th1-like Treg generation and function.
  • To investigate the role of mTORC1 signaling and mitochondrial metabolism in Treg reprogramming.
  • To validate the therapeutic potential of S1P inhibition in mitigating dysfunctional Th1-like Tregs in MS.

Main Methods:

  • In vitro studies assessing the impact of FTY720 on Th1-like Treg generation, suppressive function, mTORC1 signaling, and mitochondrial uncoupling.
  • Analysis of in vivo generated Th1-like Tregs from MS patients before and after FTY720 treatment.
  • Flow cytometry and metabolic assays to evaluate Treg phenotype, function, and mitochondrial activity.

Main Results:

  • FTY720 treatment inhibited the generation of Th1-like Tregs and rescued their suppressive function in vitro.
  • S1P inhibition decreased mTORC1 signaling and reversed mitochondrial uncoupling during Treg reprogramming.
  • In vivo, FTY720-treated MS patients showed reduced Th1-like Treg frequency, enhanced Treg suppressive function, and rebalanced mitochondrial metabolism.

Conclusions:

  • Mitochondrial uncoupling is a key factor in Treg reprogramming into dysfunctional Th1-like Tregs.
  • S1P signaling inhibition represents a promising therapeutic strategy to counteract the development of aberrant Tregs in autoimmune diseases.
  • Targeting S1P signaling can restore Treg function and metabolic balance, offering a novel approach for MS treatment.