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Superoxide-dependent hydroxylation by myeloperoxidase

A J Kettle¹, C C Winterbourn

¹Department of Pathology, Christchurch School of Medicine, New Zealand.

The Journal of Biological Chemistry

|June 24, 1994

Summary

Neutrophils use superoxide to hydroxylate salicylate, forming 2,5-dihydroxybenzoate. This reaction is catalyzed by myeloperoxidase and is crucial for understanding neutrophil function.

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Area of Science:

Biochemistry
Cell Biology
Immunology

Background:

Neutrophils generate superoxide during a respiratory burst, essential for microbial killing.
The exact functions of superoxide, including its role in salicylate hydroxylation, are not fully understood.

Purpose of the Study:

To elucidate the mechanism by which neutrophils hydroxylate salicylate.
To identify the key enzymes and reactive oxygen species involved in this process.

Main Methods:

Stimulation of neutrophils with opsonized zymosan.
Analysis of salicylate hydroxylation products using mass spectrometry.
Enzyme assays with purified myeloperoxidase and xanthine oxidase.
Studies using neutrophils from myeloperoxidase-deficient individuals.

Main Results:

Neutrophils produced 2,5-dihydroxybenzoate from salicylate, dependent on superoxide and a heme protein.
Methionine enhanced product formation, suggesting hypochlorous acid involvement.
Myeloperoxidase-deficient neutrophils showed significantly reduced salicylate hydroxylation.
Purified myeloperoxidase catalyzed superoxide-dependent salicylate hydroxylation.

Conclusions:

Myeloperoxidase catalyzes the superoxide-dependent hydroxylation of salicylate to 2,5-dihydroxybenzoate.
This reaction is independent of hydrogen peroxide and hydroxyl radicals.
The findings reveal a novel function for superoxide and myeloperoxidase in neutrophil physiology.

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