Myeloperoxidase

Myeloperoxidase is a heme-containing peroxidase enzyme that helps innate immune cells eliminate pathogens and serves as an important target for bioengineering research. During its catalytic cycle, myeloperoxidase uses hydrogen peroxide to oxidize chloride ions, generating hypochlorous acid and other reactive oxidants that damage microbial proteins, membranes, and nucleic acids. In bioengineering, this chemistry supports the design of enzyme-based biosensors, biomimetic antimicrobial materials, and in vitro models of oxidative inflammation. Measuring myeloperoxidase activity can also help evaluate immune-cell function, inflammatory disease mechanisms, and the performance or safety of engineered therapeutic systems.

Myeloperoxidase - Related Videos

Research

JoVE Journal - Immunology and Infection

Quantifying Myeloperoxidase-DNA and Neutrophil Elastase-DNA Complexes from Neutrophil Extracellular Traps by Using a Modified Sandwich ELISA

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Cited by 12 •

2023

We present a protocol for a modified sandwich enzyme-linked immunosorbent assay technique to quantitatively measure two components of neutrophil extracellular trap remnants, myeloperoxidase conjugated-DNA and neutrophil elastase conjugated-DNA complexes,derived from activated neutrophils.

An Assay to Monitor Degranulation of Azurophilic Granules in Neutrophils following Activation

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2026

Source:Jing Li1, Jaehyung Cho2,31MBL International Corporation, Des Plaines.2Division of Hematology, Department of Medicine, Washington University School of Medicine.3Department of Pathology and Immunology, Washington University School of Medicine.This video demonstrates a degranulation assay of azurophilic granules in mouse neutrophils, involving the stimulation of neutrophils to release myeloperoxidase-containing azurophilic granules. The subsequent enzymatic reaction is employed to quantify...

Non-Invasive Endotracheal Administration of Lipopolysaccharide to Induce Acute Lung Injury in Rodents

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2025

In this study, a non-invasive endotracheal instillation technique is demonstrated to develop ALI in rats using a basic laryngoscope to ensure precise LPS delivery to the lungs. The LPS is instilled via an endotracheal tube using a laryngoscope. The magnitude of lung injury is evaluated at multiple time points.

Induction and Visualization of Neutrophil Extracellular Traps in Pre-Labeled Neutrophils

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2025

This video demonstrates the induction and visualization of neutrophil extracellular traps or NETs in pre-labeled neutrophils using patient serum containing anti-neutrophil cytoplasmic antibodies. Furthermore, using an impermeable DNA dye and fluorescence microscopy enables the visualization of NETs.

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