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Area of Science:

  • Neuroscience
  • Immunology
  • Pathology

Background:

  • Neutrophils and neutrophil extracellular traps (NETs) are early responders in ischemic stroke, contributing to neuroinflammation.
  • Pyroptosis, an inflammasome-mediated cell death, exacerbates inflammation post-stroke but its link to NETs is unclear.

Purpose of the Study:

  • To elucidate the mechanistic link between NETs and pyroptosis in the context of ischemic stroke.
  • To investigate the role of the AIM2 inflammasome in NET-induced pyroptosis and stroke pathology.

Main Methods:

  • Analysis of NET levels in stroke patients' blood samples.
  • Utilizing a murine stroke model to study NETs and pyroptosis in brain tissue.
  • Employing pharmacological inhibition (GSK484) and genetic knockdown (AIM2) to assess therapeutic potential.
  • Investigating NET-induced pyroptosis in BV2 microglial cells.

Main Results:

  • Elevated NET levels were found in arterial blood at the infarct site in stroke patients.
  • A correlation existed between NET levels and neurological deficit changes (NIHSS score).
  • Inhibition of NET formation or AIM2 inflammasome activation improved neurological outcomes in a murine stroke model.
  • NETs were shown to trigger AIM2-dependent pyroptosis in microglia, both in vitro and in vivo.

Conclusions:

  • Neutrophils infiltrate the brain post-stroke, forming NETs that activate the AIM2 inflammasome in microglia.
  • This activation leads to pyroptosis, exacerbating stroke-induced brain injury and neuroinflammation.
  • Targeting NET formation or AIM2 inflammasome represents a promising therapeutic strategy for stroke treatment.