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Cellular and extracellular myeloperoxidase in pyogenic inflammation
Blood
|September 1, 1982
Summary
Neutrophils lose about half their myeloperoxidase (MPO) during bacterial infections. This active MPO is released extracellularly, contributing to inflammation and physiological processes.
Area of Science:
- Immunology
- Cell Biology
Background:
- Neutrophils play a crucial role in innate immunity.
- Myeloperoxidase (MPO) is a key enzyme in neutrophil antimicrobial activity.
Purpose of the Study:
- To investigate the impact of phagocytosis and inflammation on neutrophil MPO content.
- To determine the extracellular release of active MPO by neutrophils.
Main Methods:
- In vitro phagocytosis assays with staphylococci.
- Induction of bacterial infection in vivo.
- Quantification of MPO in neutrophils and extracellular fluid.
Main Results:
- Neutrophils retained 52% of MPO after in vitro phagocytosis, releasing 8% actively.
- Inflammatory neutrophils contained 52% of MPO compared to circulating neutrophils.
- Active MPO was detected extracellularly in infected lesions at concentrations of 10-45 U/ml.
Conclusions:
- Functioning neutrophils can lose approximately 50% of their MPO content.
- Neutrophils release active MPO extracellularly during inflammation.
- Extracellular MPO is available for various physiological processes.