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Hyaline glomerulopathy in B6C3F1 mice.
Z W Wojcinski1, M A Albassam, G S Smith
1Parke-Davis Research Institute, Mississauga, Ontario, Canada.
Toxicologic Pathology
|January 1, 1991
Summary
Hyaline glomerulopathy, a kidney disease in aging mice, was observed with unique ultrastructural features. Findings suggest a spontaneous immune-mediated mechanism in B6C3F1 mice used in toxicology studies.
Area of Science:
- Nephrology
- Immunology
- Toxicology
Background:
- Hyaline glomerulopathy is a sporadic kidney disease of unknown cause in aging mice.
- This study observed unusual ultrastructural features of hyaline glomerulopathy in B6C3F1 mice.
Purpose of the Study:
- To investigate the etiology and characteristics of hyaline glomerulopathy in aging B6C3F1 mice.
- To determine if the observed lesions suggest an immune-mediated mechanism.
Main Methods:
- Microscopic examination of renal lesions.
- Periodic acid-Schiff (PAS) and Congo red staining.
- Immunocytochemical staining for immunoglobulins (IgG, IgM, IgA).
- Ultrastructural analysis using transmission electron microscopy.
Main Results:
- Marked diffuse enlargement and hyalinization of glomeruli observed in both kidneys.
- Glomeruli were PAS positive and Congo red negative, ruling out amyloidosis.
- Weakly positive glomerular deposits detected for IgG, IgM, and IgA.
- Ultrastructural analysis revealed subendothelial osmiophilic deposits with linear, fibrillar structures (6.1-17.01 nm diameter).
Conclusions:
- The observed ultrastructural and immunocytochemical findings suggest a spontaneous immune-mediated mechanism for hyaline glomerulopathy.
- This finding is significant for B6C3F1 mice, a common strain in toxicology studies.
- Further research may elucidate the specific triggers and pathways involved in this condition.