Anti Myeloperoxidase

Serum

Other names: Anti-myeloperoxidase (MPO), ANCA, anti-MPO

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Anti-myeloperoxidase (MPO) antibodies are important for testing in a medical process called the Neutrophil Cytoplasmic Antibodies (ANCA) panel. This test helps doctors identify and tell apart certain autoimmune diseases that affect the blood vessels, mainly microscopic polyangiitis (MPA) and eosinophilic granulomatosis with polyangiitis (EGPA).

What is autoimmune vasculitides in general?

Autoimmune vasculitides are diseases where your body's defense system mistakenly attacks its own blood vessels. This leads to swelling and inflammation in these vessels, which can be big or small and can affect different parts like your skin, nerves, or internal organs. When the blood vessels get inflamed, they can weaken, narrow down, or get blocked, stopping blood from flowing properly. This can cause various symptoms depending on which blood vessels and organs are involved. The exact reason why this happens isn't fully known, but it might be due to genetic factors and certain triggers like infections. Treatment usually focuses on reducing the immune system's attack on the blood vessels to control swelling and prevent more damage.

What is Microscopic polyangiitis (MPA)?

Microscopic polyangiitis (MPA) is a rare autoimmune disease that causes inflammation of small and medium-sized blood vessels throughout the body. This inflammation can lead to damage in various organs, most commonly affecting the kidneys, lungs, nerves, skin, and joints. Symptoms of MPA vary depending on the organs involved but can include fatigue, weight loss, fever, muscle and joint pain, and kidney problems. The exact cause of MPA is unknown, but it involves the immune system attacking the blood vessels by mistake. Diagnosis typically involves blood tests, imaging, and sometimes a biopsy to confirm inflammation in the vessels. Treatment usually includes medications to suppress the immune system, like corticosteroids and immunosuppressants, to reduce inflammation and prevent further organ damage.

What is Eosinophilic Granulomatosis with Polyangiitis (EGPA)?

Eosinophilic Granulomatosis with Polyangiitis (EGPA), formerly known as Churg-Strauss Syndrome, is a rare autoimmune disease characterized by inflammation in the blood vessels and an unusually high number of eosinophils, a type of white blood cell. This condition primarily affects small to medium-sized blood vessels and can lead to complications in various organs, including the lungs, heart, skin, kidneys, and nerves. Common symptoms include asthma, sinusitis, skin rashes, joint pain, and fatigue. In severe cases, it can cause heart and lung problems. The exact cause of EGPA is unknown, but it's thought to be related to an overactive immune system. Diagnosis often involves blood tests, imaging studies, and tissue biopsies. Treatment typically includes steroids and other immunosuppressive medications to control inflammation and reduce the eosinophil count.

What is Myeloperoxidase and what are Anti-MPO antibodies?

Myeloperoxidase is an enzyme in certain white blood cells that helps fight infections. Anti-MPO antibodies are produced when your body wrongly targets this enzyme, leading to a type of vasculitis associated with ANCA. These antibodies are mainly of the IgG type and can be detected using specific lab tests. In one test, they usually show up around the nucleus of the cell (called perinuclear staining pattern or p-ANCA) due to the test process. However, a more specific test called ELISA can confirm the presence of these antibodies regardless of the staining pattern.

Why is finding anti-MPO antibodies important?

Finding anti-MPO antibodies is important for doctors. Patients with microscopic polyangiitis often have high levels of these antibodies, which can indicate how active the disease is and predict if it might return. In eosinophilic granulomatosis with polyangiitis, these antibodies are less common but still useful for diagnosis and understanding the disease's future course. Sometimes, these antibodies can also be found in other conditions like rheumatoid arthritis and inflammatory bowel disease, but usually less frequently and in lower amounts.

The harmful effects of anti-MPO antibodies in vasculitis involve complex reactions in the immune system. They are thought to trigger white blood cells, causing them to release harmful substances that damage the cells lining blood vessels. This leads to the swelling and tissue death typical of vasculitis. Understanding how anti-MPO antibodies work helps in diagnosing the disease and planning treatment, which may include drugs to suppress the immune system.

Ongoing research is trying to better understand how anti-MPO antibodies are formed and their role in causing diseases, showing the constantly changing field of autoimmune disease study. Measuring and interpreting these antibodies is crucial in clinical immunology and in managing autoimmune vasculitides.

What does it mean if your Anti Myeloperoxidase result is too high?

If levels of Anti-Myeloperoxidase (anti-MPO) are elevated, it typically indicates an autoimmune response where the body's immune system mistakenly attacks its own myeloperoxidase, an enzyme found in certain white blood cells. This condition is commonly associated with certain types of vasculitis, particularly Microscopic Polyangiitis (MPA) and Eosinophilic Granulomatosis with Polyangiitis (EGPA). Elevated anti-MPO levels can lead to inflammation and damage to blood vessels, affecting various organs and tissues. Clinically, this elevation is a significant diagnostic marker and can also help in monitoring disease activity, guiding treatment decisions, and assessing the risk of relapse in patients with these autoimmune conditions. However, it's important to consider these levels in conjunction with clinical symptoms and other diagnostic tests for an accurate diagnosis and effective management of the disease.

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