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Neutrophil Extracellular Traps: How to Generate and Visualize Them
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Neutrophil extracellular traps promote lipopolysaccharide-induced airway inflammation and mucus hypersecretion in

Yong Zou1, Xi Chen2, Jian Xiao3

  • 1Department of Emergency Medicine, Xiangya Hospital of Central South University, Changsha, China.

Oncotarget
|March 24, 2018
PubMed

Insights

Bacterial lipopolysaccharide (LPS) triggers airway inflammation and mucus. Degrading neutrophil extracellular traps (NETs) with DNase I reduced these symptoms by inhibiting the TLR4/NF-κB pathway, suggesting a new therapy for COPD and CF.

Area of Science:

  • Immunology
  • Pulmonology
  • Cell Biology

Background:

  • Bacterial lipopolysaccharide (LPS) exacerbates airway inflammation and mucus production in chronic airway diseases like COPD and CF.
  • Neutrophil extracellular traps (NETs), while antimicrobial, are implicated in disease pathogenesis but their precise role in airway inflammation and mucus hypersecretion remains unclear.

Purpose of the Study:

  • To investigate the role of NETs in LPS-induced airway inflammation and mucus hypersecretion.
  • To elucidate the underlying mechanisms by which NETs contribute to these conditions.
  • To evaluate aerosolized DNase I as a potential therapeutic strategy targeting NETs.

Main Methods:

  • A murine model of LPS-induced airway inflammation and mucus hypersecretion was established.
  • The effect of aerosolized DNase I on LPS-induced NET formation was assessed.
  • Changes in airway inflammation, mucus production, and the TLR4/NF-κB signaling pathway were analyzed.
  • The impact of NETs on macrophage-mediated cytokine production (IL-1β, IL-6, TNF-α) was examined.

Main Results:

  • LPS-induced NET formation was effectively degraded by aerosolized DNase I in mice.
  • DNase I treatment significantly reduced LPS-induced airway inflammation and mucus hypersecretion.
  • The reduction in inflammation and mucus correlated with the suppression of the TLR4/NF-κB signaling pathway.
  • NETs were found to promote LPS-induced production of pro-inflammatory cytokines IL-1β, IL-6, and TNF-α by macrophages.

Conclusions:

  • NETs play a significant role in promoting airway inflammation and mucus hypersecretion in response to LPS.
  • Degradation of NETs using aerosolized DNase I effectively ameliorates these LPS-induced responses.
  • Inhibition of the TLR4/NF-κB pathway is a key mechanism underlying the therapeutic effect of DNase I.
  • Aerosolized DNase I represents a promising therapeutic strategy for managing chronic airway inflammatory diseases such as COPD and CF.
Keywords:
TLR4/NF-κBairway inflammationlipopolysaccharidemucus hypersecretionneutrophil extracellular traps

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