Abstract
Objective and design
This study examines the role of myeloperoxidase (MPO), a major constituent of neutrophils that generates hypochlorous acid, in neutrophil recruitment into the zymosan-exposed lung of mice.
Methods
Mice were inoculated intranasally with zymosan. The accumulation of neutrophils and other inflammatory cells within the lung was analyzed by flow cytometry. Macrophage inflammatory protein 2 (MIP-2) expression in the lung was quantified, and the contribution of this chemokine to neutrophil accumulation was examined by intranasal administration of MIP-2 antibody. The cellular sources of MIP-2 were identified, and the production of this chemokine from macrophages and neutrophils was quantified in vitro.
Results
Zymosan exposure led to greater neutrophil infiltration into the lungs of MPO−/− mice relative to wild-type mice. This was associated with higher MIP-2 levels in the mutant mice. Neutralization of MIP-2 in vivo significantly reduced neutrophil infiltration. Neutrophils from MPO−/− mice produced more MIP-2, and the production was reduced when MPO was added exogenously.
Conclusions
MPO deficiency results in severe lung inflammation in mice exposed to zymosan. Relatively high MIP-2 levels likely contribute to the strong inflammatory response in these animals.
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Acknowledgments
We thank Akiko Okawara and Haruki Seta for technical support. We also thank Youichi Masuda and Yukari Nishitani for animal care. This work was supported in part by a Grant from the Japanese Ministry of Health, Labor, and Welfare.
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Responsible Editor: Michael Parnham.
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Takeuchi, K., Umeki, Y., Matsumoto, N. et al. Severe neutrophil-mediated lung inflammation in myeloperoxidase-deficient mice exposed to zymosan. Inflamm. Res. 61, 197–205 (2012). https://doi.org/10.1007/s00011-011-0401-y
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DOI: https://doi.org/10.1007/s00011-011-0401-y