Minimal change disease of the kidney in a young Sprague Dawley rat

Area of Science:

• Nephrology
• Experimental Pathology
• Animal Models

Background:

• Minimal Change Disease (MCD) is typically induced experimentally in rats.
• Spontaneous cases of MCD in rats have not been previously reported in scientific literature.

Observation:

• A 9-week-old male Sprague Dawley rat exhibited persistent albuminuria for two weeks.
• Histological examination showed no glomerular or renal tubular abnormalities via light microscopy.
• Immunofluorescence confirmed the absence of immunoglobulin G or M deposition in the glomeruli.

Findings:

• Electron microscopy revealed extensive foot process effacement in glomerular podocytes.
• Actin cytoskeleton rearrangement was noted at the base of fused podocyte foot processes.
• Desmin-positive podocytes were absent, and nephrin distribution remained normal along glomerular capillaries.

Implications:

• The observed pathological characteristics closely resemble human MCD.
• This case represents a rare instance of spontaneous MCD in a rat.
• This finding could advance the study of glomerular diseases in rodent models.