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- W2050402502 abstract "The concentrations of two components of the complement system (Clq and C3) were measured in the urine and blood in 10 normal subjects and 134 patients with primary and secondary glomerulonephritis by using a highly sensitive enzyme immunoassay. The values of urinary excretion of Clq and C3 were well correlated to the ratios of fractional clearance of these complement proteins to that of neutral dextran of 55 A, which was used to minimize the influences of glomerular sieving because of their comparable molecular size to these complement components. The rate of renal tubular reabsorption of Clq and C3 were at least 89.2 and 93.4 % of filtrated Clq and C3, respectively. Urinary Clq and C3 were excreted significantly in cases of membranoproliferative glomerulonephritis (MPGN), membranous glomerulonephritis, IgA nephropathy with both mesangial and capillary immune complex (IC) deposit and also in case of active lupus nephritis. On the other hand, the concentrations of these complement components were low in case of minimal lesion nephrotic syndrome, mild proliferative glomerulonephritis, inactive lupus nephritis and diabetic nephropathy without any immune staining. There was a significant correlation between the urinary excretion of C lq or C3 and intraglomerular IC deposition, especially IC deposition along the glomerular capillary wall. However, the degree of the excretion of these proteins was not correlated to the degree or permselectivity of proteinuria. The correlations between urinary Clq and C3 were observed in cases of IgA nephropathy with both mesangial and capillary deposit and MPGN, although we couldn't see the correlation in the other glomerular diseases. It is suggested that urinary excretion of such complement components represents the fixation of complement by deposited intraglomerular IC. The measurement of urinary concentration of these complement components provides a new clue to investigation or diagnosis of glomerular diseases." @default.
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- W2050402502 date "1990-02-01" @default.
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- W2050402502 title "Significance of urinary complement components in various glomerular diseases" @default.
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- W2050402502 doi "https://doi.org/10.1016/0049-3848(90)90080-v" @default.
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