p38 Mitogen-activated protein kinase signaling regulates streptococcal M1 protein-induced neutrophil activation and

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A Method for Generating Pulmonary Neutrophilia Using Aerosolized Lipopolysaccharide
08:33

A Method for Generating Pulmonary Neutrophilia Using Aerosolized Lipopolysaccharide

Published on: December 15, 2014

Songen Zhang1, Milladur Rahman, Su Zhang

  • 1Section for Surgery, Malmö University Hospital, Malmö, Sweden.

Journal of Leukocyte Biology
|October 6, 2011
PubMed

Insights

p38 MAPK signaling drives lung injury from Streptococcus pyogenes M1 protein by increasing neutrophil infiltration and edema. Inhibiting this pathway may protect against severe streptococcal lung damage.

Area of Science:

  • Immunology
  • Molecular Biology
  • Pathology

Background:

  • Streptococcus pyogenes M1 serotype is a significant cause of streptococcal toxic shock syndrome (STSS) and acute lung injury.
  • The precise molecular mechanisms underlying M1 protein-induced pulmonary damage require further elucidation.

Purpose of the Study:

  • To investigate the role of p38 mitogen-activated protein kinase (MAPK) signaling in M1 protein-mediated acute lung injury.
  • To determine if p38 MAPK inhibition can mitigate M1 protein-induced pulmonary pathology.

Main Methods:

  • Mice were treated with p38 MAPK inhibitors (SB 239063, SKF 86002) before M1 protein challenge.
  • Lung injury parameters (edema, neutrophil infiltration, CXC chemokines) and neutrophil Mac-1 expression were assessed.
  • p38 MAPK phosphorylation and activity were measured via immunoprecipitation and Western blot.
  • Intravital microscopy (IVM) evaluated leukocyte-endothelium interactions in pulmonary microcirculation.

Main Results:

  • M1 protein challenge activated p38 MAPK in the lung, an effect blocked by inhibitors.
  • p38 MAPK inhibition significantly reduced neutrophil infiltration, edema, and CXC chemokine levels.
  • Inhibition decreased Mac-1 expression on neutrophils and reduced leukocyte rolling and adhesion in pulmonary microvasculature.

Conclusions:

  • p38 MAPK signaling is a key regulator of neutrophil recruitment and infiltration in M1 protein-induced acute lung injury.
  • p38 MAPK activity influences CXC chemokine production and neutrophil-endothelial interactions within the lung.
  • Targeting the p38 MAPK pathway presents a potential therapeutic strategy for lung injury associated with streptococcal infections.

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