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Measuring Mitochondrial Function of Naïve and Effector CD8 T Cells
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S-2-hydroxyglutarate regulates CD8+ T-lymphocyte fate.

Petros A Tyrakis1,2, Asis Palazon1, David Macias1

  • 1Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, UK.

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|November 8, 2016
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Summary

S-2-hydroxyglutarate, an immunometabolite, accumulates in T cells and enhances their anti-tumor activity. This metabolite links cellular metabolism to immune cell function and epigenetic regulation.

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Area of Science:

  • Immunometabolism
  • Epigenetics
  • Cellular Metabolism

Background:

  • R-2-hydroxyglutarate (2-HG) accumulation is linked to cancer via isocitrate dehydrogenase mutations.
  • The physiological roles of both R- and S-2-hydroxyglutarate enantiomers are not well understood.
  • 2-hydroxyglutarate is detected in healthy individuals, indicating potential physiological relevance.

Purpose of the Study:

  • To investigate the accumulation and function of 2-hydroxyglutarate in CD8+ T cells.
  • To elucidate the mechanism of 2-hydroxyglutarate accumulation in T cells.
  • To determine the impact of S-2-hydroxyglutarate on T cell function and anti-tumor immunity.

Main Methods:

  • Analysis of 2-hydroxyglutarate levels in mouse CD8+ T cells upon T-cell receptor stimulation.
  • Investigation of hypoxia-inducible factor 1-alpha (HIF-1α) dependence for 2-hydroxyglutarate accumulation.
  • Assessment of S-2-hydroxyglutarate effects on T cell differentiation markers, histone/DNA demethylation, and HIF-1α stability.
  • Evaluation of S-2-hydroxyglutarate's impact on CD8+ T cell proliferation, persistence, and anti-tumor capacity in vivo.

Main Results:

  • 2-hydroxyglutarate accumulates in mouse CD8+ T cells following T-cell receptor triggering, dependent on HIF-1α.
  • S-2-hydroxyglutarate predominates in activated T cells and alters CD8+ T cell differentiation markers.
  • S-2-hydroxyglutarate modulates histone and DNA demethylation and influences HIF-1α stability.
  • Treatment with S-2-hydroxyglutarate significantly enhances the in vivo anti-tumor function of CD8+ T cells.

Conclusions:

  • S-2-hydroxyglutarate functions as a critical immunometabolite in CD8+ T cells.
  • This metabolite connects environmental cues to immune cell fate via a metabolic-epigenetic axis.
  • S-2-hydroxyglutarate enhances T cell proliferation, persistence, and anti-tumor efficacy, offering therapeutic potential.