Based on the clinico-chemical observations made on inpatients, experimental nephrosis caused by the administration of nephrotoxin (antikidney serum) or mercury bichloride were investigated, in order to elucidate the disturbance of protein or fat metabolism, and their sequential relation to proteinuria. The results obtained were as follows:
1) In nephrosis, every components of plasma lipids increased simultaneously, except phospholipid. The increase of total lipids or fatty acids shall be attributed chiefly to the increase of cholesterol or neutral fatt.
In nephrotoxinized rats, together with clinical signs, simultaneous increases of every courponents of plasma lipids were observed as well. In case of rat, treated with mercury bichlcride, no significant increases of plasma lipids, except cholesterol, were observed.
2) In nephrosis, decrease of total protein, albumin, and γ-globulin, and increase of α, β, and φ globulin were observed. Thus the decrease of total protein in nephrosis shall be attributed chiefly to that of albumin fraction.
In nephrotoxinized rats, similar results were obtained as to plasma protein.
As for fractions of urine protein in these rats, decrease of albumin and increase of α, β. or γ globulin were observed together with the progress of nephrosis.
3) In nephrosis, amount of protein excreted in urine, body weight, total lipid, free and total cholesterol and β globulin, were parallel to each other, except albumin that was inversely to their changes.
4) Immediately after the administration of nephrotoxin in rats, proteinuria developed. In case of exclusive proteinuria with definite grade, changes of blood chemical components, such as hyperlipemia or hypoalbuminemia, and the development of edema were resulted. However in case of very slight grade of proteinuria, no sequential change was observed.
5) In nephrotoxinized rat, significant correlation between the amount of protein excreted in urine and total lipids in plasma, and then between albumin and total cholesterol in plasma were obtained. (Correlation coefficients were +0.57 and -059, respectively)
Similarly, in nephrosis, significant correlation was found between urine protein and total cholesterol in plasma. (Correlation coefficient were +0.44)
6) In rats, treated with nephrotoxin or mercury bichloride, contents of lipids in viscera. such as liver, spleen, heart or kidney, were compared with that of healthy ones, while in rats, which developed marked proteinuria by large amount of nephrotoxin, the contents of phospholipid in viscera decreased markedly, those of total lipids or total cholasterol in them showed no significant changes.
7) From these results, it may be concluded that in case of nephrotoxin-nephrosis, clinico-pa thological changes develop in sequence of degeneration of glomerulus or tubules in kidney, loss of protein in urine, hypoalbuminemia and hyperlipemia.
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