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Measuring Mitochondrial Function of Naïve and Effector CD8 T Cells
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Mitochondrial damage-associated molecular patterns trigger arginase-dependent lymphocyte immunoregulation.

Lauren P Westhaver1, Sarah Nersesian2, Adam Nelson2

  • 1Department of Pathology, Dalhousie University, Halifax, NS, Canada.

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|May 25, 2022
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Summary

Tissue damage releases mitochondrial damage-associated molecular patterns (mitoDAMPs) that impair natural killer (NK) and T cell immune responses. Arginine depletion by mitoDAMPs alters lymphocyte function, regulating inflammation during tissue injury.

Keywords:
CP: ImmunologyNK cellarginasearginine metabolismdamage-associated molecular patterns (DAMPs)immunoregulationlymphocytesmass spectrometrymitochondrianatural killer celltissue damage

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Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Medicine

Background:

  • Tissue damage compromises cellular and mitochondrial integrity, releasing damage-associated molecular patterns (DAMPs).
  • Mitochondrial DAMPs (mitoDAMPs) signal cellular stress and injury to the immune system.
  • Lymphocytes, including NK and T cells, play crucial roles in immune surveillance and response.

Purpose of the Study:

  • To investigate the impact of mitoDAMPs on lymphocyte phenotypes and functions.
  • To elucidate the mechanisms by which mitoDAMPs modulate immune responses.
  • To understand the role of mitoDAMPs in regulating inflammation following tissue injury.

Main Methods:

  • Primary lymphocyte cultures from mice and human donors were utilized.
  • In vitro and in vivo assays assessed NK cell cytotoxicity, IFN-γ production, and T cell proliferation.
  • Mass spectrometry identified components of mitoDAMP preparations, followed by functional validation using arginase inhibition and arginine add-back.

Main Results:

  • MitoDAMPs induced regulatory phenotypes and functions in NK cells and T cells.
  • NK cell cytotoxicity, IFN-γ production, and T cell proliferation were suppressed by mitoDAMPs.
  • Arginine depletion, mediated by arginase within mitoDAMPs, was identified as the key mechanism altering lymphocyte function.

Conclusions:

  • Lymphocyte responses to mitoDAMPs represent a conserved mechanism for regulating inflammation post-tissue injury.
  • MitoDAMPs can suppress adaptive and innate immune responses through arginine depletion.
  • Understanding this pathway offers insights into immune modulation during tissue damage and repair.