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Measuring Mitochondrial Function of Na&#239;ve and Effector CD8 T Cells
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Nutrient-driven histone code determines exhausted CD8+ T cell fates.

Shixin Ma1, Michael S Dahabieh2, Thomas H Mann1

  • 1NOMIS Center for Immunobiology and Microbial Pathogenesis, Salk Institute for Biological Studies, La Jolla, CA, USA.

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|December 12, 2024
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Summary
This summary is machine-generated.

Exhausted T cells (TEX) reprogram nutrient metabolism, switching from acetate to citrate. This metabolic shift alters histone acetylation, impacting T cell exhaustion and anti-tumor immunity, offering new therapeutic targets.

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Area of Science:

  • Immunology
  • Metabolic pathways
  • Epigenetics

Background:

  • Exhausted T cells (TEX) exhibit metabolic and epigenetic alterations that compromise anti-cancer and anti-viral responses.
  • The precise role of nutrient metabolism in directing the epigenetic modifications governing TEX differentiation is not fully understood.

Purpose of the Study:

  • To investigate how nutrient metabolism influences epigenetic modifications during CD8+ T cell exhaustion.
  • To elucidate the specific metabolic pathways and enzymes involved in regulating the epigenetic landscape of TEX.

Main Methods:

  • Analysis of metabolic profiles in TEX, focusing on acetate and citrate utilization.
  • Assessing the activity of key enzymes like acetyl-CoA synthetase 2 (ACSS2) and ATP-citrate lyase (ACLY).
  • Investigating histone acetylation patterns and their correlation with gene expression in TEX.

Main Results:

  • TEX cells preferentially utilize citrate over acetate by down-regulating ACSS2 and maintaining ACLY activity.
  • Citrate metabolism, via KAT2A-ACLY interactions, enhances histone acetylation at TEX-specific genes.
  • Acetate metabolism, mediated by p300-ACSS2 complexes, reduces acetylation at effector and memory T cell genes.
  • Overexpressing ACSS2 or inhibiting ACLY reversed TEX differentiation and boosted anti-tumor T cell activity.

Conclusions:

  • A nutrient-instructed histone code regulates CD8+ T cell differentiation.
  • Targeting metabolic pathways (ACSS2/ACLY) offers a strategy to enhance anti-tumor T cell responses.
  • Findings have implications for developing novel metabolic and epigenetic therapies for T cell dysfunction.