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Down-regulated circulating PMN function after injury despite enhanced p38 MAPK activity.

Ketan Sheth1, John Friel, Brian Nolan

  • 1Department of Surgery, University of Massachusetts Medical School, Worcester, MA, USA.

Surgical Infections
|January 10, 2003
PubMed
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Following injury, circulating neutrophils exhibit an enhanced p38 MAPK response to LPS, despite overall suppressed function. This suggests complex regulation of neutrophil signaling post-trauma, impacting immune responses and organ function.

Area of Science:

  • Immunology
  • Cell Biology
  • Trauma Research

Background:

  • Neutrophils (PMN) play a critical role in the immune response to injury.
  • Post-injury circulating PMN display a suppressed phenotype, including reduced apoptosis and endotoxin (LPS) responsiveness.
  • The p38 mitogen-activated protein kinase (MAPK) pathway is crucial for regulating PMN functions.

Purpose of the Study:

  • To investigate the role of p38 MAPK signaling in post-injury circulating neutrophils.
  • To determine if p38 signaling is down-regulated in PMN following severe trauma.
  • To explore the impact of circulating factors in trauma plasma on PMN function.

Main Methods:

  • Isolation of PMN from trauma patients and healthy volunteers.
  • Assessment of p38 MAPK activity via Western blotting and in vitro kinase assays.

Related Experiment Videos

  • Quantification of PMN apoptosis and IL-1beta secretion following LPS stimulation.

    • Main Results:

    • Circulating PMN from trauma patients showed a threefold increased LPS-signaled p38 MAPK response compared to controls.
    • Plasma from trauma patients could transfer this enhanced p38 response to normal PMN.
    • While apoptosis was unchanged, IL-1beta secretion was significantly decreased in trauma patient PMN.

    Conclusions:

    • Injury leads to selective down-regulation of PMN function despite enhanced p38 MAPK activity.
    • These findings indicate a complex shift in p38 signaling post-injury.
    • Regulation of LPS responses occurs downstream of p38 MAPK activity in the context of trauma.