Myeloperoxidase (MPO) is a heme-containing peroxidase predominantly expressed in neutrophils and monocytes. It plays a central role in the innate immune response by catalyzing the formation of reactive oxidants, such as hypochlorous acid (HOCl), from hydrogen peroxide and chloride ions. While essential for microbial killing, excessive MPO activity contributes to oxidative stress and tissue damage in various inflammatory and chronic diseases including atherosclerosis, neurodegeneration, and chronic obstructive pulmonary disease (COPD). Accurate measurement of MPO activity is therefore critical for understanding its role in oxidative stress and related pathologies.

Biological Role of MPO in Oxidative Stress

MPO generates potent oxidants that modify lipids, proteins, and DNA, exacerbating oxidative injury and inflammation. It serves as a biomarker for neutrophil activation and oxidative stress status in biological samples. Elevated MPO activity correlates with disease severity in cardiovascular and inflammatory disorders, making it a valuable target for both diagnostic and therapeutic research.

Applications in Oxidative Stress Research

• Quantification of MPO as a marker of neutrophil activation and oxidative stress
• Investigation of MPO’s role in inflammatory diseases and tissue injury
• Evaluation of antioxidant and MPO-inhibitory therapeutic agents
• Monitoring MPO activity in preclinical models of acute pancreatitis, cardiovascular disease, and neurodegeneration

Myeloperoxidase assay kits provide robust, sensitive, and versatile methods for measuring MPO activity, a key enzyme linking immune response and oxidative stress. These kits are invaluable tools for elucidating MPO’s role in oxidative tissue damage, inflammation, and related diseases, and for screening potential MPO-targeted therapies.