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Myeloperoxidase modulates lung epithelial responses to pro-inflammatory agents
A Haegens1, J H J Vernooy, P Heeringa
1Dept of Respiratory Medicine, University Hospital Maastricht, P.O. Box 5800, NL-6202 AZ Maastricht, The Netherlands.
The European Respiratory Journal
|December 7, 2007
Summary
Myeloperoxidase (MPO) can enter lung epithelial cells, increasing oxidative stress and DNA damage. This neutrophil enzyme also surprisingly reduces interleukin-8 production in bronchial cells, potentially limiting inflammation.
Area of Science:
- Cell Biology
- Immunology
- Respiratory Medicine
Background:
- Neutrophil secondary necrosis releases myeloperoxidase (MPO), a potent enzyme capable of damaging lung cells.
- Emerging evidence suggests MPO possesses pro-inflammatory roles beyond its enzymatic activity.
Purpose of the Study:
- To investigate the internalization of MPO by lung epithelial cells.
- To determine the impact of MPO on oxidative stress, DNA damage, and cytokine production in these cells.
Main Methods:
- Human alveolar and bronchial epithelial cells were stimulated with MPO, with or without pro-inflammatory priming.
- MPO internalisation, haemoxygenase (HO)-1 expression, DNA strand breakage, and interleukin (IL)-8 and -6 production were analyzed.
Main Results:
- MPO was detected within the cytoplasm of lung epithelial cells.
- MPO stimulation upregulated HO-1 expression and induced DNA strand breakage.
- MPO inhibited IL-8 production in bronchial epithelial cells but not alveolar cells.
Conclusions:
- Lung epithelial cells internalize MPO, which can induce oxidative stress and DNA damage.
- MPO exhibits cell-damaging potential and can modulate cytokine production, suggesting a regulatory role in neutrophil recruitment via IL-8 inhibition in bronchial epithelium.
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