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Related Concept Videos

Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

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The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
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Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
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IL-15 reprogramming compensates for NK cell mitochondrial dysfunction in HIV-1 infection.

Elia Moreno-Cubero1, Aljawharah Alrubayyi1, Stefan Balint2

  • 1Nuffield Department of Clinical Medicine and.

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|February 22, 2024
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Summary

Chronic HIV-1 infection impairs natural killer (NK) cell metabolism, specifically reducing oxidative phosphorylation (OXPHOS). However, interleukin-15 (IL-15) priming can restore NK cell function in these patients.

Keywords:
AIDS/HIVImmunologyMitochondriaNK cells

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Area of Science:

  • Immunology
  • Cellular Metabolism
  • Virology

Background:

  • Cellular metabolism dynamically regulates immune cell function, impacting NK cell responses.
  • Persistent HIV-1 infection causes chronic immune activation, NK cell redistribution, and dysregulation.
  • Adaptive NK cell subpopulations, like NKG2C+ cells, expand during chronic infection.

Purpose of the Study:

  • To investigate the metabolic characteristics of NK cell subsets in HIV-1 infection.
  • To understand the impact of HIV-1 on the bioenergetics of adaptive NK cells.
  • To explore strategies for restoring NK cell function in HIV-1 infection.

Main Methods:

  • Flow cytometry to analyze NK cell subsets.
  • Metabolic assays to assess oxidative phosphorylation (OXPHOS) and mitochondrial function.
  • Interleukin-15 (IL-15) pretreatment to evaluate NK cell responses.

Main Results:

  • HIV-1 infection leads to uniformly reduced OXPHOS in NK cells, irrespective of adaptive phenotypes.
  • Mitochondrial defects, including depolarization and increased fission, were observed in NK cells from HIV-1 infected individuals.
  • IL-15 pretreatment enhanced mammalian target of rapamycin complex 1 (mTORC1) activity and improved NK cell functionality.

Conclusions:

  • HIV-1 infection impairs NK cell metabolic plasticity through mitochondrial defects.
  • IL-15 priming represents a potential therapeutic strategy to boost NK cell responses in HIV-1 infection.