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CD137 costimulation enhances T cell anti-cancer activity by increasing mitochondrial size and function, a process dependent on OPA-1. This finding is crucial for developing effective cancer immunotherapies.

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Area of Science:

  • Immunology
  • Cancer Biology
  • Cell Biology

Background:

  • T and NK lymphocytes express CD137 (4-1BB), a receptor crucial for cancer immunotherapy.
  • Mitochondria play a vital role in T lymphocyte function and survival.

Purpose of the Study:

  • To investigate the impact of CD137 costimulation on T cell mitochondria.
  • To determine the role of mitochondrial morphology and function in CD137-mediated anti-tumor immunity.

Main Methods:

  • Utilized agonist monoclonal antibodies (mAbs) and CD137 ligand (4-1BBL) for CD137 costimulation.
  • Assessed mitochondrial mass, transmembrane potential, and respiratory capacity in human and mouse CD8+ T cells.
  • Investigated the role of OPA-1 in CD137-induced mitochondrial changes.
  • Evaluated tumor rejection in mice receiving adoptive T-cell therapy combined with anti-CD137 treatment.

Main Results:

  • CD137 costimulation led to mitochondria enlargement, increased mass, and enhanced transmembrane potential in CD8+ T cells.
  • These mitochondrial changes were dependent on OPA-1 expression and improved T cell respiratory capacity.
  • Agonist anti-CD137 invigorated mitochondria in tumor-reactive T cells from cancer-bearing mice.
  • Tumor rejection was critically dependent on OPA-1 in CD8+ T cells during combination therapy.

Conclusions:

  • CD137 costimulation critically links mitochondrial morphology and function to enhanced T cell anti-tumor effector activity.
  • Targeting CD137 and modulating mitochondrial dynamics presents a promising strategy for cancer immunotherapy.