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A novel mouse model for MPO-ANCA-associated glomerulonephritis
Wako Yumura1, Mitsuyo Itabashi, Akiko Ishida-Okawara
1Department of Medicine, Kidney Center, Tokyo Women's Medical University, Japan. yumura@kc.twmu.ac.jp
Abstract:
We established a novel model mouse for myeloperoxidase anti-neutrophil cytoplasmic antibody (MPO-ANCA)-associated glomerulonephritis with crescentic formation, which was induced by administering bovine serum albumin (BSA). Neutrophil infiltration into the renal glomeruli began at 8 weeks and crescent formation was observed from 10 weeks after the first BSA injection. Platelet and neutrophil counts significantly increased, and proteinuria was observed from 5 weeks. MPO-ANCA increased slightly at 4 and markedly at 9 weeks, and the TNF-alpha level increased at 11 weeks. Glomerular neutrophil infiltration was correlated with MPO-ANCA levels. In addition, proteinuria also significantly correlated with MPO-ANCA levels. Finally, renal crescent formation was associated with an increase of MPO-ANCA levels and neutrophil infiltration into glomeruli. The glomerular immune deposition of IgG and C3 was observed. These findings indicate that BSA induces neutrophil activation of peripheral blood followed by the elevation of MPO-ANCA, resulting in the development of crescentic glomerulonephritis in mice.
Insights
A new mouse model for myeloperoxidase anti-neutrophil cytoplasmic antibody (MPO-ANCA)-associated glomerulonephritis was developed. Bovine serum albumin (BSA) induced MPO-ANCA elevation and crescent formation, mimicking human kidney disease.
Area of Science:
- Nephrology
- Immunology
- Pathology
Background:
- Anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitis is a severe autoimmune disease.
- Myeloperoxidase (MPO)-ANCA is a key autoantigen in certain forms of ANCA vasculitis.
- Developing reliable animal models is crucial for understanding disease pathogenesis and testing therapies.
Purpose of the Study:
- To establish a novel mouse model of MPO-ANCA-associated glomerulonephritis.
- To investigate the sequential development of kidney pathology following induction of MPO-ANCA.
- To explore the correlation between MPO-ANCA levels, neutrophil infiltration, and disease severity.
Main Methods:
- Induction of glomerulonephritis in mice using bovine serum albumin (BSA) immunization.
- Monitoring of neutrophil and platelet counts, proteinuria, and MPO-ANCA levels over time.
- Assessment of renal pathology, including neutrophil infiltration and crescent formation.
- Analysis of glomerular immune deposition (IgG, C3) and TNF-alpha levels.
Main Results:
- Neutrophil infiltration into glomeruli began at 8 weeks, with crescent formation observed from 10 weeks post-BSA injection.
- Significant increases in platelet and neutrophil counts, and proteinuria were noted from 5 weeks.
- MPO-ANCA levels rose progressively, correlating with neutrophil infiltration and proteinuria.
- Renal crescent formation was associated with elevated MPO-ANCA and glomerular neutrophil infiltration; IgG and C3 deposition was observed.
Conclusions:
- Bovine serum albumin (BSA) administration successfully induced a mouse model of MPO-ANCA-associated glomerulonephritis.
- The model recapitulates key features of human crescentic glomerulonephritis, including MPO-ANCA production and renal pathology.
- This model provides a valuable tool for studying the mechanisms underlying MPO-ANCA vasculitis and for evaluating potential therapeutic interventions.
