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ANCA-associated crescentic glomerulonephritis with immune complex deposits
Keiichi Sumida1, Yoshifumi Ubara, Kazufumi Nomura
1Department of Pathology, Toranomon Hospital, Tokyo, Japan. k-sumida@toranomon.gr.jp
Clinical Nephrology
|May 19, 2012
Summary
Anti-neutrophil cytoplasmic antibody (ANCA)-associated crescentic glomerulonephritis (CGN) can present with or without immune complex (IC) deposits. IC deposits in ANCA-associated CGN are linked to renal-limited disease and distinct clinical features.
Area of Science:
- Nephrology
- Immunology
- Pathology
Background:
- Anti-neutrophil cytoplasmic antibody (ANCA)-associated crescentic glomerulonephritis (CGN) is a severe kidney disease.
- The presence and significance of immune complex (IC) deposits in ANCA-associated CGN are not fully understood.
Purpose of the Study:
- To investigate the clinical and pathological characteristics of ANCA-associated CGN with IC deposits.
- To differentiate between ANCA-associated CGN with and without IC deposits.
Main Methods:
- Retrospective analysis of 28 renal biopsy specimens from patients with anti-myeloperoxidase (MPO)-ANCA positive CGN.
- Comparison of clinical data between patients with (Group A) and without (Group B) IC deposits.
Main Results:
- Immune complex deposits were found in 43% of patients (Group A), characterized by mesangial or capillary wall deposition.
- Patients with IC deposits (Group A) showed lower MPO-ANCA and CRP levels, less pulmonary involvement, but significantly higher proteinuria compared to those without IC deposits (Group B).
- Three patterns of IC deposition were identified: mesangial IgA/C3, mesangial IgG/C3, and capillary wall IgG/C3.
Conclusions:
- ANCA-associated CGN presents with two distinct patterns: pauci-immune without IC deposits and IC deposition type.
- The IC deposition type exhibits varied patterns within the glomeruli.
- The association of IC deposits with renal-limited vasculitis in ANCA-associated CGN warrants further investigation.
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