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An experimental study on the origin of foam cells in glomerulonephritis
Abstract:
Masugi nephritis induced in cholesterol-fed rabbits is characterized by accumulation of foam cells in glomeruli which vary in number almost in parallel with the natural course of the disease. From electron microscopic appearances these foam cells are apparently derived from migrant blood monocytes and mesangial cells, but not from endothelial cells. Location of monocytic foam cells is extremely variable, though most often observed in the subendothelial space. In addition, monocytes undergo transformation into multinucleated giant cells including Touton type's. Lipid deposits filling the cytoplasm of foam cells seem to be in two forms, free cytoplasmic droplets and membrane-bounded structures partly containing membranous debris or myelin figures. The latter accumulates preferentially in the cytocentrum and is considered to originate from lysosomes. It seems unlikely that glomerular lesions in Masugi nephritis are aggravated by foam cell accumulation.
Insights
In Masugi nephritis, foam cells in glomeruli originate from monocytes and mesangial cells. Their accumulation does not appear to worsen kidney disease progression.
Area of Science:
- Nephrology
- Pathology
- Cell Biology
Background:
- Masugi nephritis is a kidney disease.
- Foam cell accumulation is a key feature.
- The origin and role of foam cells are not fully understood.
Purpose of the Study:
- To investigate the origin of foam cells in Masugi nephritis.
- To examine the cellular transformation of foam cells.
- To determine the impact of foam cell accumulation on disease severity.
Main Methods:
- Induction of Masugi nephritis in cholesterol-fed rabbits.
- Electron microscopy for cellular analysis.
- Histopathological examination of glomerular lesions.
Main Results:
- Foam cells in glomeruli originate from migrant blood monocytes and mesangial cells, not endothelial cells.
- Monocytes transform into multinucleated giant cells, including Touton-type cells.
- Lipid deposits within foam cells appear as free droplets or lysosome-derived structures.
Conclusions:
- Foam cell origin in Masugi nephritis is clarified.
- Monocyte transformation into giant cells is observed.
- Foam cell accumulation is unlikely to aggravate glomerular lesions in this model.