Abstract
Extract: Albumin concentration in the proximal tubules of normal rats and rats with aminonucleoside nephrosis (AMN) was estimated by means of a sensitive radioimmunoassay. Nephrotic animals were studied at the onset of proteinuria and when the nephrotic syndrome was fully established. Albumin concentration in the proximal tubule of normal male rats averaged 2.5 ± 0.3 mg/100 ml, whereas in early nephrotic rats it averaged 4.9 ± 1.3 mg/100 ml and in normal sized tubules of heavily proteinuric rats, 15.7 ± 3.3 mg/100 ml. Control and early AMN animals appeared to have a relatively homogeneous population of surface convolutions, whereas the fully nephrotic rats had markedly increased heterogeneity. A population of dilated proximal tubules with an albumin concentration of 233.8 ± 35.4 mg/100 ml was found in this group. Albumin concentrations were randomly distributed throughout the proximal convolution of all three groups with no clear pattern of changing concentration along the nephron. The data demonstrate that enhanced glomerular permeability to albumin occurs in the experimental nephrotic syndrome in the rat.
Speculation: Early proximal tubular albumin concentrations are increased in aminonucleoside nephrosis in the rat, which indicates that there is an increased glomerular permeability to albumin in this disease. Absolute amounts of albumin leaving the end of the proximal convolution are increased over controls. Increased albumin excretion in these animals may be accounted for, in part, by increased glomerular permeability for albumin.
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Lewy, J., Pesce, A. Micropuncture Study of Albumin Transfer in Aminonucleoside Nephrosis in the Rat. Pediatr Res 7, 553–559 (1973). https://doi.org/10.1203/00006450-197306000-00002
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DOI: https://doi.org/10.1203/00006450-197306000-00002
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