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Legionella pneumophila Outer Membrane Vesicles: Isolation and Analysis of Their Pro-inflammatory Potential on Macrophages
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Regulative effect of P38MAPK on release of TNFalpha and NO from alveolar macrophages under endotoxin stimulation

J Lu1, Z Yang, J Jiang

  • 1Research Institute of Surgery, Daping Hospital, Third Military Medical University, Chongqing, 400042, China.

Chinese Journal of Traumatology = Zhonghua Chuang Shang Za Zhi
|February 9, 2002
PubMed
Abstract

Insights

Lipopolysaccharide (LPS) activates P38 mitogen-activated protein kinase (P38MAPK) in alveolar macrophages, influencing the release of TNF-alpha and NO. P38MAPK inhibition reduces these inflammatory mediators, suggesting its role in lung inflammation.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Alveolar macrophages (AM) play a critical role in lung immunity.
  • Lipopolysaccharide (LPS) is a potent activator of inflammatory responses in macrophages.
  • Tumor necrosis factor-alpha (TNF-alpha) and nitric oxide (NO) are key inflammatory mediators.

Purpose of the Study:

  • To investigate the activation of P38 mitogen-activated protein kinase (P38MAPK) in AM following LPS stimulation.
  • To determine the effect of P38MAPK activation on the release of TNF-alpha and NO from AM.
  • To explore the relationship between P38MAPK, TNF-alpha, and NO secretion.

Main Methods:

  • AM were isolated from bronchoalveolar lavage fluid (BALF).
  • P38MAPK activation was assessed using Western blot analysis.
  • The specific P38MAPK inhibitor, SB203580, was employed to evaluate its regulatory effects on TNF-alpha and NO release.

Main Results:

  • LPS stimulation led to P38MAPK activation in AM, peaking at 30 minutes.
  • SB203580 significantly inhibited LPS-induced P38MAPK activation.
  • LPS-induced secretion of TNF-alpha and NO was significantly increased and subsequently inhibited by SB203580.

Conclusions:

  • P38MAPK is implicated in the LPS-induced secretion of TNF-alpha and NO by AM.
  • P38MAPK represents a potential therapeutic target for modulating inflammatory mediator release in lung inflammatory conditions.

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