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Three-dimensional morphometric analysis of segmental glomerulosclerosis in the rat
A Remuzzi1, R Pergolizzi, M S Mauer
1Istituto di Ricerche Famacologiche, Mario Negri, Bergamo, Italy.
Kidney International
|November 1, 1990
Summary
Sclerotic lesions in experimental nephrosis affect nearly all glomeruli, even those appearing normal in single sections. This study used serial sections to reveal the true, widespread incidence of glomerular sclerosis.
Area of Science:
- Nephrology
- Pathology
- Experimental Medicine
Background:
- Idiopathic nephrotic syndrome and experimental models show visceral epithelial cell changes across all glomeruli.
- Segmental sclerotic changes are traditionally thought to affect only a subset of glomeruli.
Purpose of the Study:
- To determine the true incidence and spatial extent of sclerotic lesions within individual glomeruli.
- To investigate if glomeruli appearing normal in one section are affected by sclerosis elsewhere.
Main Methods:
- Utilized serial-section morphological analysis and stereology techniques.
- Measured Bowman's capsule (BC), capillary tuft (CT), and sclerotic lesion volumes in control and adriamycin (ADR)-treated rats.
- Assessed all consecutive sections containing individual glomeruli to calculate true glomerular and lesion volumes.
Main Results:
- Mean volumes of BC and CT were not significantly different between control and ADR rats.
- Glomerular volume distribution was more varied in ADR rats, indicating heterogeneous glomerular changes.
- Sclerotic lesions were found in 90-94% of glomeruli in ADR-treated rats, with no lesions in controls.
Conclusions:
- Conventional methods underestimate the prevalence of glomerular sclerosis in experimental nephrosis.
- Nearly all glomeruli are affected by sclerotic changes, challenging previous assumptions about segmental involvement.
- Serial-section analysis is crucial for accurately assessing the full extent of glomerular damage.