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An Efficient Sieving Method to Isolate Intact Glomeruli from Adult Rat Kidney
Published on: November 1, 2018
Sclerotic lesions in the glomeruli of Buffalo/Mna rats
Abstract:
Spontaneously developing focal and segmental glomerulosclerosis (FGS) in Buffalo/Mna rats was studied. There were no differences in the occurrence of the disease between male and female rats. Plasma macromolecules were detected in the urine samples of 2-month-old rats using sodium dodecyl sulphate polyacrylamide gel electrophoresis. All 4-month-old animals had proteinuria in excess of 30 mg/24 h. At the age of 4 months, sclerotic glomeruli were rarely observed. At the age of 6 months, all animals had a few sclerotic glomeruli in every kidney section examined. Animals which were 22 months old had sclerotic lesions in 37.8-52.1% of the glomeruli. Ultrastructural examination revealed that alterations in epithelial cells, such as effacement of foot processes, vacuolization, and a podocytic membrane-like structure, were found at the age of 2 months. The animals examined were neither uremic nor hypertensive. Our present study showed that female as well as male Buffalo/Mna rats had an earlier onset of the disease than the other strains of rats and that alterations in glomerular epithelial cells were first detected in the early stage of the disease.
Insights
Buffalo/Mna rats develop focal and segmental glomerulosclerosis (FGS) earlier than other rat strains. Early-stage glomerular epithelial cell changes precede kidney disease development in both male and female rats.
Area of Science:
- Nephrology
- Pathology
- Animal Models
Background:
- Spontaneous focal and segmental glomerulosclerosis (FGS) is a kidney disease affecting certain rat strains.
- Understanding the early pathogenesis of FGS is crucial for developing therapeutic strategies.
Purpose of the Study:
- To investigate the onset and progression of spontaneous FGS in Buffalo/Mna rats.
- To identify early cellular changes associated with FGS development.
Main Methods:
- Longitudinal study of Buffalo/Mna rats from 2 to 22 months of age.
- Urinary macromolecule detection via SDS-PAGE.
- Histopathological examination of kidney sections.
- Ultrastructural analysis of glomerular epithelial cells.
Main Results:
- No sex-based difference in FGS incidence.
- Proteinuria (>30 mg/24 h) detected by 4 months of age.
- Sclerotic glomeruli observed in all rats by 6 months, affecting 37.8-52.1% by 22 months.
- Glomerular epithelial cell alterations (foot process effacement, vacuolization) observed as early as 2 months.
Conclusions:
- Buffalo/Mna rats exhibit an earlier onset of FGS compared to other strains.
- Glomerular epithelial cell alterations are early indicators of FGS development.
- The disease progression in this model occurs independently of uremia or hypertension.
