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Mitochondrial Dynamics Controls T Cell Fate through Metabolic Programming.

Michael D Buck1, David O'Sullivan2, Ramon I Klein Geltink2

  • 1Department of Immunometabolism, Max Planck Institute of Immunobiology and Epigenetics, 79108 Freiburg, Germany; Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA.

Cell
|June 14, 2016
PubMed
Summary
This summary is machine-generated.

Mitochondrial dynamics control T cell metabolism. Fused mitochondria in memory T cells favor fatty acid oxidation, while fragmented mitochondria in effector T cells promote glycolysis, impacting anti-tumor immunity.

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Area of Science:

  • Immunology
  • Cell Biology
  • Metabolic Research

Background:

  • Effector T (TE) cells utilize anabolic metabolism (aerobic glycolysis).
  • Memory T (TM) cells utilize catabolic metabolism (fatty acid oxidation - FAO).
  • Signals driving these metabolic differences in T cells are not fully understood.

Purpose of the Study:

  • Investigate the role of mitochondrial dynamics in T cell metabolic programming.
  • Determine if mitochondrial structure influences T cell function and metabolism.

Main Methods:

  • Comparative analysis of mitochondrial morphology in TE and TM cells.
  • Genetic manipulation of mitochondrial fusion (Opa1) in T cells.
  • Assessment of metabolic pathways (glycolysis, FAO, OXPHOS) and T cell function.

Main Results:

  • TE cells exhibit punctate (fragmented) mitochondria; TM cells display fused mitochondrial networks.
  • The fusion protein Opa1 is essential for TM cell mitochondrial structure.
  • Enforcing mitochondrial fusion in TE cells induced TM cell metabolic characteristics and enhanced anti-tumor activity.
  • Mitochondrial fusion in TM cells optimizes electron transport chain (ETC) efficiency for FAO.
  • Mitochondrial fission in TE cells leads to cristae expansion, reducing ETC efficiency and promoting glycolysis.

Conclusions:

  • Mitochondrial remodeling, specifically fusion and fission, is a key mechanism instructing T cell metabolic programming.
  • Altered mitochondrial dynamics directly impact T cell metabolic pathways and effector functions.
  • Targeting mitochondrial dynamics could be a strategy to enhance anti-tumor T cell responses.