Related Experiment Videos
[The effects of human and mouse pepsins on Masugi nephritis]
Abstract:
The effects of intravenous administration of human or mouse pepsin were investigated on Masugi nephritis in rats and mice, which is an experimental model of glomerulonephritis in humans. Injection of anti-kidney serum to rats significantly increased the urinary protein excretion, serum levels of fibrinogen, cholesterol and immune complex, significantly decreased serum immunoglobulin G and complement levels, and caused histopathological changes such as detachment of endothelial cells from basement membrane, thickening of basement membrane, fusion of foot process and increase in hyaline cast in renal tubuli. Deposit of anti-rat IgG on glomerular capillary wall was also observed. All of these changes were ameliorated or showed a tendency to be ameliorated by intravenous administration of human pepsin, and the mechanism responsible for these effects was suggested to be selective decomposition of immune complex. Marked increase in urinary protein excretion was also observed in mice that intravenously received anti-kidney serum. This increase was suppressed by intravenous administration of human or mouse serum, the latter showing a stronger effect.
Insights
Human pepsin administration ameliorated Masugi nephritis in rats by breaking down immune complexes. Mouse pepsin also suppressed increased urinary protein in mice with nephritis.
Area of Science:
- Nephrology
- Immunology
- Biochemistry
Context:
- Masugi nephritis, an experimental model of human glomerulonephritis, was induced in rats and mice using anti-kidney serum.
- This induction led to significant increases in urinary protein, serum fibrinogen, cholesterol, and immune complexes.
- Histopathological changes included endothelial cell detachment, basement membrane thickening, foot process fusion, and hyaline casts.
Purpose:
- To investigate the therapeutic effects of intravenous human and mouse pepsin on Masugi nephritis.
- To explore the potential mechanism of pepsin's action, specifically its effect on immune complexes.
Summary:
- Intravenous administration of human pepsin ameliorated the pathological and clinical signs of Masugi nephritis in rats.
- Pepsin's therapeutic effect is hypothesized to stem from the selective decomposition of immune complexes.
- Both human and mouse pepsin suppressed the increased urinary protein excretion observed in mice with nephritis, with mouse pepsin showing a stronger effect.
Impact:
- This study suggests a potential therapeutic strategy for glomerulonephritis by targeting immune complex degradation.
- Pepsin's role in modulating immune-mediated kidney damage warrants further investigation for clinical applications.
- Findings contribute to understanding the pathogenesis and potential treatment of immune complex-related kidney diseases.