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Collagenofibrotic glomerulonephropathy associated with immune complex deposits
N Hisakawa1, N Yasuoka, K Nishiya
1Second Department of Internal Medicine, Kochi Medical School, Japan. hisakawa@dtn.am400gw.kochi-ms.ac.jp
Abstract:
A 66-year-old Japanese male, who suffered from persistent proteinuria and leg edema, underwent renal biopsy. Light microscopy revealed marked narrowing of the glomerular capillary lumen with a diffuse accumulation of weakly PAS-positive material. By electron microscopy, abundant abnormal collagen fibers were observed predominantly in the subendothelial space and occasionally in the mesangial matrix. The fibers had a periodicity of about 60 nm and were immunoreactive for anti-type III collagen. Subendothelial electron-dense deposits were also found in some of the capillary walls. The serum level of procollagen III peptides was elevated and changed in parallel with the amount of proteinuria during the patient's clinical course. On the basis of these findings, a diagnosis of the collagenofibrotic glomerulonephropathy was made. A review of the literature, including 29 similar or identical cases, failed to reveal the etiology and pathogenesis of this disease. We suggest that this disease may be divided into two different clinical subtypes, an adult-onset type and a pediatric type.
Insights
This study identifies collagenofibrotic glomerulonephropathy, a rare kidney disease characterized by abnormal collagen deposits. Further research is needed to understand its causes and develop treatments.
Area of Science:
- Nephrology
- Pathology
- Genetics
Background:
- Persistent proteinuria and leg edema indicate potential kidney dysfunction.
- Renal biopsy is a key diagnostic tool for evaluating kidney diseases.
Observation:
- Light microscopy showed narrowed glomerular capillaries with PAS-positive material.
- Electron microscopy revealed abnormal, 60 nm periodic collagen fibers in the subendothelial space and mesangium.
- Electron-dense deposits were noted in capillary walls.
Findings:
- Abnormal collagen type III fibers and elevated serum procollagen III peptides were identified.
- These findings led to a diagnosis of collagenofibrotic glomerulonephropathy.
- The etiology and pathogenesis of this condition remain unknown after reviewing 29 cases.
Implications:
- Collagenofibrotic glomerulonephropathy may present as distinct adult-onset and pediatric subtypes.
- Understanding the disease's origins is crucial for targeted therapies.
- This research contributes to the classification and understanding of rare glomerular diseases.