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Pseudomonas aeruginosa Induced Lung Injury Model
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Pseudomonas aeruginosa Ventilator-Associated Pneumonia Induces Lung Injury through TNF-α/c-Jun NH2-Terminal Kinase

Ying-Wei Yang1,2, Yu-Zhen Jiang3, Ching-Mei Hsu3

  • 1Institute of Emergency and Critical Care Medicine, National Yang-Ming University, Taipei, Taiwan.

Plos One
|January 7, 2017
PubMed

Insights

Pseudomonas aeruginosa (PA) causes ventilator-associated pneumonia (VAP) lung injury via JNK1-mediated inflammation. Blocking JNK1 signaling in mice reduced PA VAP severity, suggesting therapeutic targets.

Area of Science:

  • Pulmonary Medicine
  • Microbiology
  • Immunology

Background:

  • Ventilator-associated pneumonia (VAP) is a critical ICU infection.
  • Pseudomonas aeruginosa (PA) is a leading cause of VAP, associated with high morbidity and mortality.
  • The precise molecular mechanisms of PA-induced VAP lung injury require further elucidation.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying lung injury induced by PA in VAP.
  • To determine the role of the JNK1 signaling pathway in PA VAP pathogenesis.
  • To explore the involvement of alveolar macrophages and associated inflammatory pathways.

Main Methods:

  • Utilized C57BL/6 wild-type (WT) and JNK1 knockout (JNK1-/-) mice subjected to mechanical ventilation (MV) with or without PA instillation.
  • Employed PA-stimulated alveolar macrophage (AM) supernatants for lung injury induction.
  • Assessed inflammatory markers, including NF-κB activity, cytokines (TNF-α, IL-1β, IL-6), ICAM, VCAM, and neutrophil sequestration in lung tissue and bronchoalveolar lavage fluid (BALF).
  • Investigated ex vivo AM responses to PA, including TNF-α production, in WT, JNK1-/-, and IKKβΔMye mice.

Main Results:

  • MV combined with PA instillation significantly increased lung inflammation markers in WT mice, but this was attenuated in JNK1-/- mice.
  • PA-induced lung injury was exacerbated by MV in WT mice compared to JNK1-/- mice, particularly concerning protein concentration and neutrophil infiltration in BALF.
  • TNF-α was identified as a critical regulator of PA VAP-induced lung injury.
  • PA stimulation activated TNF-α production in AMs via IKK/NF-κB pathways, while JNK signaling was crucial in the lungs.

Conclusions:

  • PA colonization plays a significant role in PA VAP-induced lung injury through JNK1-mediated inflammation.
  • The pathogenesis of PA VAP involves TNF-α production via IKK/NF-κB activation in AMs and JNK signaling in the lungs.
  • Targeting the JNK1 signaling pathway may offer a therapeutic strategy for managing PA VAP.

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