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Selective vitamin B12 malabsorption with proteinuria. Renal biopsy study
Nephron
|January 1, 1979
Summary
Kidney biopsies in patients with vitamin B12 malabsorption revealed deposits in the glomeruli, which decreased with adequate treatment. These deposits were not immunological and did not correlate with proteinuria.
Area of Science:
- Nephrology
- Gastroenterology
- Internal Medicine
Background:
- Selective vitamin B12 malabsorption can affect various organ systems.
- Renal involvement in vitamin B12 malabsorption is not well-characterized.
- Proteinuria is a common finding in renal diseases.
Purpose of the Study:
- To investigate the renal pathology in patients with selective vitamin B12 malabsorption.
- To determine the nature and significance of glomerular deposits in these patients.
- To assess the relationship between renal findings, treatment, and proteinuria.
Main Methods:
- Percutaneous renal biopsy in 5 patients with selective vitamin B12 malabsorption.
- Light microscopy, electron microscopy, and immunohistochemical examination of renal tissue.
- Correlation of renal findings with clinical data, treatment status, and proteinuria.
Main Results:
- Electron microscopy showed increased mesangial matrix, thickened basement membranes, and electron-dense deposits in glomeruli.
- Immunohistochemistry revealed immunoglobulin deposits, but no complement, suggesting non-immunological origins.
- Deposits were associated with inadequate treatment and reduced with adequate treatment; proteinuria was independent of deposits.
Conclusions:
- Renal biopsies in vitamin B12 malabsorption can show specific ultrastructural changes.
- Glomerular deposits in these patients are likely related to prolonged inadequate treatment rather than an immune process.
- Adequate treatment may lead to a reduction in these deposits, highlighting the importance of timely diagnosis and management.