P-ANCA

P-ANCA or Perinuclear Anti-Neutrophil Cytoplasmic Antibodies are a group of autoantibodies, usually IgG, detected in the blood of patients with certain autoimmune diseases. These antibodies primarily target proteins within neutrophils, which are a type of white blood cell.

Overview

P-ANCA is one of the two main types of ANCA (Anti-Neutrophil Cytoplasmic Antibodies), the other being C-ANCA. The "P" in P-ANCA stands for perinuclear, referring to the staining pattern observed when the antibodies are applied to neutrophils in a laboratory setting. This pattern is due to the antibodies binding to proteins that are most abundant in the perinuclear area of the cell.

Clinical Significance

P-ANCA is most commonly associated with Microscopic polyangiitis, Churg-Strauss syndrome, and Ulcerative colitis. However, it can also be found in other conditions such as Rheumatoid arthritis, Systemic lupus erythematosus, and Inflammatory bowel disease.

Testing

Testing for P-ANCA is done through a blood test. The presence of these antibodies can help in the diagnosis of certain autoimmune diseases. However, it is not a definitive test as these antibodies can also be present in healthy individuals.

See Also

• ANCA
• C-ANCA
• Autoimmune diseases
• Neutrophils

References

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