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Electron microscopy of nephropathia epidemica. Renal tubular basement membrane
Abstract:
Tubular basement membranes in kidney biopsies from 18 patients with nephropathia epidemica were studied by electron microscopy. Both in the cortex and in the medulla there was splitting of the basement membrane. Thickened basement membrane around occasional tubules contained membrane vesicles, usually empty but also with a core and a diameter of approximately 180 nm. Membranous convoluted structures and light finely fibrillar areas in the basement membranes were seen. Splitting of the basement membrane was most prominent in the medulla, and the membrane was filled with round to oval particles 55 to 470 nm in diameter. Of the possible mechanisms of damage at the basement membrane level in this disease, the findings suggest liberation of antigen from the tubular cells and reaction of circulating antibodies with the antigen in the basement membrane.
Insights
Nephropathia epidemica damages kidney tubular basement membranes, causing splitting and particle accumulation. These findings suggest antigen release and antibody reactions within the kidney
Area of Science:
- Nephrology
- Pathology
- Electron Microscopy
Background:
- Nephropathia epidemica is a disease affecting the kidneys.
- Tubular basement membranes are crucial structures within the kidney.
Purpose of the Study:
- To investigate ultrastructural changes in tubular basement membranes in nephropathia epidemica.
- To elucidate potential mechanisms of kidney damage in this disease.
Main Methods:
- Electron microscopy was used to examine kidney biopsies.
- 18 patients with nephropathia epidemica were included in the study.
Main Results:
- Splitting of the tubular basement membrane was observed in both the cortex and medulla.
- The medulla showed prominent basement membrane splitting filled with particles (55-470 nm).
- Thickened basement membranes contained vesicles and membranous structures.
Conclusions:
- Findings suggest antigen liberation from tubular cells.
- Circulating antibodies may react with released antigens in the basement membrane.
- This points to an immune-mediated mechanism in nephropathia epidemica kidney damage.