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Decoding NK Cell Subset Dysregulation in SARS-CoV-2 Infection: Phenotypic, Functional, and Transcriptomic Insights

Marlyn D Sepúlveda1, Walter D Cardona Maya2, Wildeman Zapata-Builes3

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Summary
This summary is machine-generated.

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection impairs natural killer (NK) cell function, altering their subsets and receptor expression. This dysfunction contributes to COVID-19 immunopathogenesis and suggests therapeutic targets.

Keywords:
NK cell subsetsNK cellsSARS‐CoV‐2bulk RNAseqscRNAseq

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Area of Science:

  • Immunology
  • Virology
  • Cell Biology

Background:

  • Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) impacts innate immunity, particularly natural killer (NK) cells crucial for antiviral defense.
  • Understanding NK cell subset alterations and molecular changes in COVID-19 is vital for comprehending disease pathogenesis.

Purpose of the Study:

  • To review and synthesize phenotypic, functional, and transcriptomic data on NK cell subset disruption in COVID-19.
  • To elucidate the molecular mechanisms underlying NK cell dysfunction during SARS-CoV-2 infection.
  • To identify potential biomarkers and therapeutic targets for restoring NK cell antiviral activity.

Main Methods:

  • Flow cytometry analysis of NK cell subsets (CD56bright, CD56dimCD16+, CD56dimCD16-, CD56-CD16+).
  • Assessment of NK cell receptor expression (activating and inhibitory).
  • Single-cell RNA sequencing (scRNA-seq) and transcriptomic profiling to analyze gene expression patterns, including interferon-stimulated genes (ISGs) and inflammatory pathways.

Main Results:

  • COVID-19 is associated with generalized lymphopenia and reduced CD56bright and CD56dimCD16+ NK cell subsets.
  • Increased CD56dimCD16- and CD56-CD16+ populations correlate with disease severity.
  • Molecularly, there's an imbalance in NK cell receptors, with increased NKG2A, PD-1, LAG-3 and decreased NKp30, NKp46, NKG2D, indicating an exhausted phenotype.
  • scRNA-seq revealed increased proliferative/cytotoxic CD56dim NK subpopulations and reduced CD56bright cells in severe cases.
  • Transcriptomic data showed suppressed NK effector functions due to upregulated ISGs and inflammatory pathways (STAT1/3, NF-κB, TGF-β).

Conclusions:

  • Progressive NK cell dysfunction is implicated in the immunopathogenesis of COVID-19.
  • Multi-omic and phenotypic approaches offer a comprehensive view of NK cell responses to SARS-CoV-2.
  • Identified NK cell alterations and molecular pathways suggest potential biomarkers and therapeutic targets to restore antiviral immunity.