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Studies on the glomerular permeability with human liver ferritin
1Third Department of Internal Medicine, Okayama University Medical School, Japan.
Nihon Jinzo Gakkai Shi
|November 1, 1993
Summary
Human liver ferritin effectively traces kidney filtration. In puromycin aminonucleoside (PAN) nephrosis, damaged kidneys leaked significantly more monomeric ferritin into urine, revealing impaired glomerular basement membrane (GBM) function.
Area of Science:
- Nephrology
- Biochemistry
- Cell Biology
Background:
- The glomerular basement membrane (GBM) is crucial for kidney filtration.
- Understanding GBM permeability is essential for diagnosing kidney diseases.
Purpose of the Study:
- To investigate the role of the GBM in kidney filtration using human liver ferritin as a novel tracer.
- To assess glomerular permselectivity in puromycin aminonucleoside (PAN) nephrosis models.
Main Methods:
- Human liver ferritin (monomeric and polymeric) was isolated and injected into rats with induced PAN nephrosis and control rats.
- Urinary ferritin excretion was measured using radioimmunoassay.
- Ferritin distribution within the GBM was visualized using electron microscopy.
Main Results:
- Rats with PAN nephrosis excreted 33 times more monomeric ferritin than controls.
- Monomeric ferritin showed greater excretion than polymeric ferritin.
- In PAN nephrosis, monomeric ferritin permeated the entire GBM and entered epithelial cells, unlike in controls where it was restricted.
Conclusions:
- Human liver ferritin is a valuable tracer for studying glomerular filtration and permselectivity.
- PAN nephrosis significantly impairs GBM integrity, leading to increased ferritin leakage.
- The study demonstrates the utility of human liver ferritin in both biochemical and ultrastructural analyses of kidney filtration.