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Morphological and Compositional Analysis of Neutrophil Extracellular Traps Induced by Microbial and Chemical Stimuli
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Innate Immune Function of Neutrophil Cytoplasts Generated Post-Vital NETosis.

Nithish Raj Prasad1, Balaji Ganesh1, Steven Dudek1

  • 1University of Illinois Chicago.

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|April 27, 2026
PubMed
Summary
This summary is machine-generated.

Vital NETosis generates anuclear polymorphonuclear neutrophils (PMN cyto) that phagocytose bacteria and protect against pneumonia. These PMN cyto offer potential as cell-based antibacterial therapies for lung infections.

Keywords:
Neutrophilscytoplastsinflammatory lung injuryneutrophil extracellular traps

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Area of Science:

  • Immunology
  • Cell Biology
  • Infectious Disease

Background:

  • Polymorphonuclear neutrophils (PMN) are key in innate immunity, migrating to infection sites like the lungs.
  • Neutrophil Extracellular Traps (NETs) are formed via NETosis, a process largely studied through lytic cell death.
  • Vital NETosis, occurring without PMN lysis, generates anuclear PMN cytoplasts (PMN cyto) with less understood functions.

Purpose of the Study:

  • To investigate the role of PMN cyto in host defense during pneumonia.
  • To determine the therapeutic potential of PMN cyto in combating bacterial lung infections.

Main Methods:

  • Induction of pneumonia in mice using *Pseudomonas aeruginosa* (PA) challenge.
  • Utilized transgenic mice (tDTomato) to track PMN migration and PMN cyto generation.
  • Assessed PMN cyto phagocytic activity, bactericidal capacity, and effect on lung injury and mortality.

Main Results:

  • PA pneumonia induced PMN transmigration and significant PMN cyto generation in lung airspace.
  • PMN cyto demonstrated active phagocytosis and killing of PA, with intact bactericidal pathways.
  • PMN cyto instillation reduced lung injury and mortality, requiring functional mitochondria.
  • Genetic deletion of PAD4 enhanced PMN cyto generation and abrogated pneumonia-induced mortality.

Conclusions:

  • PMN cyto generated via vital NETosis possess crucial host defense functions against bacterial pneumonia.
  • PMN cyto exhibit potent antibacterial activity and protective effects against lung inflammation.
  • PMN cyto represent a promising cell-based therapeutic strategy for treating pneumonia.