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Myeloperoxidase (MPO) - Enzyme & Biomarker

Myeloperoxidase (MPO) is an enzyme found in white blood cells that helps destroy bacteria during infections and inflammation. Elevated MPO levels may indicate cardiovascular disease or inflammatory conditions.

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Things worth knowing about "Myeloperoxidase"

Myeloperoxidase (MPO) is an enzyme found in white blood cells that helps destroy bacteria during infections and inflammation. Elevated MPO levels may indicate cardiovascular disease or inflammatory conditions.

What is Myeloperoxidase?

Myeloperoxidase (MPO) is an enzyme primarily found in specific white blood cells called neutrophilic granulocytes and monocytes. It belongs to the heme peroxidase family and plays a central role in the innate immune system. MPO is stored in specialized cell compartments called azurophilic granules and is released when the immune system becomes activated.

Mechanism of Action

When an infection or inflammatory response occurs, neutrophils become activated and release MPO into the surrounding tissue or body fluids. The enzyme catalyzes the reaction of hydrogen peroxide (H&sub2;O&sub2;) with chloride ions to produce hypochlorous acid (HOCl), a potent oxidative disinfectant. This process, known as the oxidative burst, effectively destroys bacteria, fungi, and other pathogens.

MPO uses hydrogen peroxide as a substrate
It generates reactive oxygen species (ROS)
Hypochlorous acid damages the cell walls of pathogens
This process is referred to as the antimicrobial defense mechanism

Medical Significance

MPO as a Biomarker

In modern medicine, MPO is increasingly used as a biomarker for inflammation and cardiovascular disease. Elevated MPO levels in the blood are associated with an increased risk of heart attack, atherosclerosis, and heart failure. Research has shown that MPO can contribute to the destabilization of atherosclerotic plaques, thereby increasing the risk of acute cardiovascular events.

MPO in Inflammatory Conditions

In addition to cardiovascular disease, elevated MPO levels are also observed in the following conditions:

Chronic inflammatory diseases such as rheumatoid arthritis
Kidney diseases, particularly ANCA-associated vasculitides (MPO-ANCA)
Neurological conditions such as multiple sclerosis
Pulmonary diseases such as chronic bronchitis and COPD
Severe bacterial infections and sepsis

MPO Deficiency

Inherited MPO deficiency is one of the most common congenital immune defects in humans. Affected individuals have a reduced ability to fight certain fungal infections, particularly those caused by Candida species. In otherwise healthy individuals, MPO deficiency is often asymptomatic; however, in people with diabetes mellitus or other immunodeficiencies, it can lead to serious infections.

Diagnosis and Laboratory Values

MPO can be measured in the blood using an ELISA (Enzyme-Linked Immunosorbent Assay) or rapid immunological tests. Of particular clinical importance is the MPO-ANCA test, which is used in the diagnosis of vasculitis (inflammation of the blood vessels). Reference ranges may vary between laboratories, and elevated values should always be interpreted within the broader clinical context.

Elevated MPO levels: indicative of inflammation, infection, or increased cardiovascular risk
MPO-ANCA positive: suggestive of vasculitis (e.g., microscopic polyangiitis)
Low MPO activity in neutrophils: possible MPO deficiency

Clinical Relevance and Therapeutic Aspects

Inhibition of MPO is being investigated as a therapeutic strategy for a range of conditions. Since excessive MPO activity generates oxidative stress and can damage healthy tissue, researchers are developing MPO inhibitors for the treatment of cardiovascular disease, kidney disorders, and neurodegenerative conditions. Several candidate compounds are currently being evaluated in clinical trials.

References

Lau D, Baldus S. - Myeloperoxidase and its contributory role in inflammatory vascular disease. - Pharmacology & Therapeutics, 2006.
Klebanoff SJ. - Myeloperoxidase: friend and foe. - Journal of Leukocyte Biology, 2005.
Falk RJ, Jennette JC. - ANCA are pathogenic -- oh yes they are! - Journal of the American Society of Nephrology, 2002.

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