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Untangling "NETosis" from NETs.

Shida Yousefi1, Darko Stojkov1, Nina Germic1

  • 1Institute of Pharmacology, University of Bern, Bern, Switzerland.

European Journal of Immunology
|January 11, 2019
PubMed
Summary
This summary is machine-generated.

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Neutrophil extracellular trap (NET) formation involves releasing DNA scaffolds from neutrophils, not necessarily cell death. This study differentiates NET formation mechanisms from necrotic neutrophil death (NETosis).

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Neutrophil extracellular traps (NETs) are crucial for immobilizing and killing microbes.
  • NET formation involves neutrophils releasing DNA scaffolds, primarily from mitochondrial DNA.
  • NETosis is described as a distinct form of programmed necrotic cell death in neutrophils.

Purpose of the Study:

  • To differentiate the mechanisms of mitochondrial DNA release for NET formation versus nuclear DNA release during necrotic cell death.
  • To clarify the distinct functions of mitochondrial DNA and nuclear DNA released by neutrophils.
  • To resolve conflicting views on NET formation and neutrophil death processes.

Main Methods:

  • Investigating the molecular mechanisms underlying DNA release from neutrophils.
  • Distinguishing between the release of mitochondrial DNA and nuclear DNA.
Keywords:
Cell deathInnate immunityMitochondrial DNANET formationNeutrophils

Related Experiment Videos

  • Analyzing the functional consequences of released DNA.

    • Main Results:

    • NET formation requires glycolytic ATP for cytoskeletal rearrangements, enabling mitochondrial DNA release and degranulation, and does not inherently involve cell death.
    • Necrotic neutrophil death (NETosis) involves plasma and nuclear membrane permeabilization, releasing nuclear DNA.
    • The molecular triggers for mitochondrial DNA release (NET formation) differ from those causing necrotic neutrophil death.

    Conclusions:

    • NET formation and necrotic neutrophil death (NETosis) are distinct processes with different underlying molecular mechanisms.
    • Understanding these differences is critical for clarifying the roles of NETs and neutrophil death in immunity and disease.
    • Further research is needed to fully elucidate the functional implications of mitochondrial versus nuclear DNA release.