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Antimyeloperoxidase antibodies in patients with extracapillary glomerulonephritis
L Nässberger1, A G Sjöholm, H Thysell
1Department of Medical Microbiology, University of Lund, Sweden.
Abstract:
The sera of 64 patients with extracapillary glomerulonephritis were investigated by enzyme-linked immunosorbent assay for the presence of antibody to human neutrophil myeloperoxidase (MPO). In all, circulating anti-MPO were found in 30% and antineutrophil cytoplasm antibodies (ANCA) detected by indirect immunofluorescence in 44% of the patients. Autoantibody to components of neutrophil granulocytes was not found in patients with other forms of glomerulonephritis. The incidence of ANCA (16/23) was higher than that of anti-MPO (5/23) in patients with a diagnosis of Wegener's granulomatosis. By contrast, anti-MPO was found in a majority of vasculitis patients without extrarenal symptoms (6/9), including 3 patients treated with hydralazine. One of the patients treated with hydralazine had circulating ANCA in combination with anti-MPO. Anti-MPO was also found in 1 out of 6 patients with Goodpasture's syndrome. The findings emphasize that autoantibodies to distinct components of neutrophil granulocytes partly differ with regard to diagnostic specificity.
Insights
Researchers investigated autoantibodies in patients with glomerulonephritis. They found that autoantibodies to neutrophil granulocytes, including anti-myeloperoxidase (MPO) and antineutrophil cytoplasm antibodies (ANCA), show diagnostic specificity in different kidney diseases.
Area of Science:
- Nephrology
- Immunology
- Rheumatology
Background:
- Extracapillary glomerulonephritis is associated with autoantibodies.
- Understanding the specificity of these autoantibodies is crucial for diagnosis.
Purpose of the Study:
- To investigate the presence and diagnostic specificity of autoantibodies to human neutrophil myeloperoxidase (anti-MPO) and antineutrophil cytoplasm antibodies (ANCA) in patients with extracapillary glomerulonephritis.
Main Methods:
- Enzyme-linked immunosorbent assay (ELISA) was used to detect anti-MPO antibodies.
- Indirect immunofluorescence was used to detect ANCA.
- Sera from 64 patients with extracapillary glomerulonephritis were analyzed.
Main Results:
- Circulating anti-MPO antibodies were found in 30% of patients, and ANCA in 44%.
- Autoantibodies to neutrophil granulocytes were not detected in other forms of glomerulonephritis.
- In Wegener's granulomatosis, ANCA incidence was higher than anti-MPO. Anti-MPO was prevalent in vasculitis patients, including those treated with hydralazine.
Conclusions:
- Autoantibodies targeting distinct neutrophil granulocyte components exhibit varying diagnostic specificities.
- These findings highlight the differential diagnostic value of anti-MPO and ANCA in glomerulonephritis and vasculitis.