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Focal Segmental Glomerulosclerosis in Related Miniature Schnauzer Dogs
Wilson Yau1, Lisa Mausbach2, Meryl P Littman3
11 Department of Pathology, College of Veterinary Medicine, University of Georgia, Athens, GA, USA.
Veterinary Pathology
|December 2, 2017
Summary
Focal segmental glomerulosclerosis (FSGS) is a common cause of proteinuria in Miniature Schnauzers. This study details kidney morphologic features in affected dogs, revealing podocytopathy as a key finding.
Area of Science:
- Veterinary Pathology
- Nephrology
- Canine Genetics
Background:
- Focal segmental glomerulosclerosis (FSGS) is increasingly recognized as a significant cause of proteinuria in dogs.
- Miniature Schnauzers are particularly predisposed to this condition, necessitating a deeper understanding of its pathological basis.
Purpose of the Study:
- To describe the detailed morphologic and ultrastructural kidney findings in proteinuric Miniature Schnauzers with FSGS.
- To investigate potential contributing factors to FSGS in this specific breed.
Main Methods:
- Histopathological examination of kidney tissues from 8 related proteinuric Miniature Schnauzers.
- Ultrastructural analysis to evaluate glomerular and podocyte pathology.
- Correlation of morphologic findings with clinical proteinuria levels (urine protein-to-creatinine ratio).
Main Results:
- FSGS affected 32-49% of glomeruli, characterized by capillary tuft solidification.
- Podocytopathy, including foot process effacement, was universally present without immune deposits.
- Arteriolar hyalinosis and intraglomerular lipid accumulation were common findings; proteinuria ranged from 1.2 to 6.5.
Conclusions:
- The study identifies characteristic podocyte injury and secondary changes in Miniature Schnauzers with FSGS.
- Potential contributing factors include genetic podocytopathy, lipid metabolism, and glomerular hypertension.
- Further research is needed to elucidate the precise etiology of FSGS in this breed.
