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Updated: Sep 20, 2026
Anti-Nuclear Antibody Screening Using HEp-2 Cells
Published on: June 23, 2014
[Antineutrophil cytoplasmic antibody(ANCA)]
1Department of Nephrology, Hachioji Medical Center of Tokyo Medical University, Hachioji 193-0998.
Abstract:
ANCA are associated with small sized vessel vasculitis; one subtype is an antibody against myeloperoxidase(MPO), which stains in a perinuclear pattern(P-ANCA) indirect immunofluorescence(IIF) using a neutrophil substrate, and the other subtype is an antibody against proteinase-3(PR-3), which stains in a diffuse granular cytoplasmic pattern ANCA by IIF. PR-3 ANCA is more specific in Wegener's granulomatosis(WG) than the other primary vasculitides. MPO-ANCA can be found in microscopic polyangiitis (MPA), Churg Strauss Syndromes(CSS), drug-induced vasculitis, and environmental factor-induced such as silicosis vasculitis more frequently than WG. The value of the IIF test for ANCA detection can be greatly increased by the addition of a standardized antigen-specific ELISA. The intra-assay and inter-assay CV of the MPO and PR-3 ELISA were 6.6 to 4.8%, respectively. Close ANCA titer correlation was shown between MPO-ANCA ELISA and the activity of ANCA associated vasculitis. Renal manifestations and pulmonary manifestations are observed in 70-90% of AAV as the initial manifestation. The changes in titers of ANCA seem to reflect disease activity in 60-70% of AAV patients. A combination of steroids and immunosuppressive drugs is effective in relieving the clinical symptoms of AAV.
Insights
Anti-neutrophil cytoplasmic antibody (ANCA) vasculitis involves specific antibodies. Detecting myeloperoxidase (MPO)-ANCA and proteinase-3 (PR-3)-ANCA with ELISA improves diagnosis and monitoring of ANCA-associated vasculitis.
Area of Science:
- Immunology
- Rheumatology
- Clinical Chemistry
Context:
- Anti-neutrophil cytoplasmic antibodies (ANCA) are key diagnostic markers for small vessel vasculitis.
- Two main subtypes, myeloperoxidase (MPO)-ANCA and proteinase-3 (PR-3)-ANCA, exhibit distinct immunofluorescence patterns.
- PR-3 ANCA is highly specific for Wegener's granulomatosis (WG), while MPO-ANCA is more prevalent in microscopic polyangiitis (MPA) and other conditions.
Purpose:
- To evaluate the diagnostic and monitoring utility of antigen-specific ELISA for MPO-ANCA and PR-3 ANCA.
- To correlate ANCA titers with disease activity in ANCA-associated vasculitis (AAV).
- To assess the clinical manifestations and treatment efficacy in AAV.
Summary:
- Indirect immunofluorescence (IIF) for ANCA detection is enhanced by standardized antigen-specific ELISA.
- ELISA demonstrated low intra-assay and inter-assay coefficients of variation (CV) for MPO and PR-3.
- A strong correlation was observed between MPO-ANCA ELISA titers and AAV disease activity.
- Renal and pulmonary manifestations are common initial symptoms in 70-90% of AAV patients.
- ANCA titer changes reflect disease activity in 60-70% of AAV patients.
- Combination therapy with steroids and immunosuppressants effectively manages AAV symptoms.
Impact:
- Standardized ELISA assays improve the accuracy and reliability of ANCA testing.
- Correlating ANCA titers with disease activity allows for more precise patient management and treatment adjustments.
- This approach aids in early diagnosis and monitoring of AAV, potentially improving patient outcomes.
- Understanding the prevalence of MPO-ANCA and PR-3 ANCA in different vasculitis subtypes refines diagnostic criteria.
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