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Neonatal neutrophils with prolonged survival secrete mediators associated with chronic inflammation

Caroline N Nguyen1, Patricia M Schnulle, Nasser Chegini

  • 1Department of Pediatrics, University of Florida, Gainesville, Fla, USA.

Neonatology
|June 17, 2010
PubMed
Abstract

Insights

Neonatal neutrophils resistant to apoptosis may drive chronic inflammation. Surviving neonatal neutrophils show enhanced secretion of key inflammatory mediators like IL-8, suggesting a role in neonatal inflammatory disorders.

Area of Science:

  • Immunology
  • Neonatal Medicine
  • Inflammation Research

Background:

  • Neutrophil (PMN) apoptosis is crucial for inflammation resolution.
  • Persistent PMN due to impaired apoptosis contributes to chronic inflammation.
  • Neonatal PMN exhibit prolonged survival and augmented CD18/CD11b expression.

Purpose of the Study:

  • To test if surviving neonatal PMN secrete mediators linked to chronic inflammation.
  • Investigate the inflammatory potential of long-lived neonatal neutrophils.

Main Methods:

  • Lipopolysaccharide (LPS) stimulation of neonatal and adult PMN.
  • Cytokine and chemokine profiling using multicytokine arrays and ELISA.

Main Results:

  • LPS-stimulated surviving neonatal PMN showed enhanced IL-8 secretion.
  • Neonatal PMN exhibited increased MIP-1β and decreased IL-1Ra secretion compared to 0-hour PMN.

Conclusions:

  • Surviving neonatal neutrophils display augmented inflammatory mediator secretion.
  • These findings suggest a role for neonatal PMN in the pathogenesis of neonatal inflammatory diseases.

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