Abstract
Myeloperoxidase (MPO) is a major protein constituent of the primary granules of vertebrate neutrophils. It catalyses the hydrogen peroxide-mediated oxidation of halide ions to hypohalous acids, especially HOCl. These reactive oxygen species can participate in a variety of secondary reactions, leading to modifications of amino acids and many types of biological macromolecules. The classic paradigm views MPO as a component of the phagocyte oxygen-dependent intracellular microbicidal system, and thus an important arm of the effector phase of innate immune responses. However, the limited immunodeficiency associated with lack of MPO in mouse and human models has challenged this paradigm. In this review we examine more recent information on the interaction between MPO, its bioreactive reaction products, and targets within the inflammatory microenvironment. We propose that two assumptions of the current model may require revisiting. First, many important targets of MPO modification are extracellular, rather than present only within the phagolysosome, such as various components of neutrophil extracellular traps. Second, we suggest that the pro-inflammatory pathological role of MPO may be a particular feature of chronic inflammation. In the physiological setting of acute neutrophil-mediated inflammation MPO may also form part of a negative feedback loop which down-regulates inflammation, limits tissue damage, and facilitates the switch from innate to adaptive immunity. This different perspective on this well-studied enzyme may usefully inform further research into its function in health and disease.
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Abbreviations
- ANCA:
-
Anti-neutrophil cytoplasmic autoantibodies
- DC:
-
Dendritic cell
- ER:
-
Endoplasmic reticulum
- HDL:
-
High density lipoprotein
- HOCl:
-
Hypochlorous acid
- HOBr:
-
Hypobromous acid
- H2O2 :
-
Hydrogen peroxide
- LDL:
-
Low density lipoprotein
- MMP:
-
Matrix metalloproteinase
- MPO:
-
Myeloperoxidase
- NADPH:
-
Nicotinamide adenine dinucleotide phosphate
- NET:
-
Neutrophil extracellular trap
- PAMP:
-
Pathogen-associated molecular pattern
- PRR:
-
Pattern recognition receptor
- TLRs:
-
Toll-like receptors
- SVV:
-
Small-vessel vasculitides
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Acknowledgments
Authors thank Dr Rafał Biedroń for assistance in the preparation of this manuscript for publication. Zofia Prokopowicz was supported by a MRC studentship. Benjamin Chain is supported by a grant from Ovarian Cancer Action. Janusz Marcinkiewicz is supported by a grant from the Jagiellonian University Medical College (Grant no. K/ZDS/001008 and Grant no. K/PBW/000643).
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An erratum to this article is available at http://dx.doi.org/10.1007/s00005-014-0321-y.
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Prokopowicz, Z., Marcinkiewicz, J., Katz, D.R. et al. Neutrophil Myeloperoxidase: Soldier and Statesman. Arch. Immunol. Ther. Exp. 60, 43–54 (2012). https://doi.org/10.1007/s00005-011-0156-8
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DOI: https://doi.org/10.1007/s00005-011-0156-8