Abstract

MADALENA, Leticia et al. Proteinuria: renal structural injury and comparison of methods. Acta bioquím. clín. latinoam. [online]. 2013, vol.47, n.1, pp.85-93. ISSN 0325-2957.

Proteinuria (TP-ur) is associated with adverse outcomes. Analytical specificities as well as the calibration of the methods cause considerable variation of TP-ur. SDS-PAGE with silver staining is an excellent single-test for non-invasively diagnosing a complete (cT) or incompleted tubular (iT) and/or glomerular (G) protein profile (PP). In order to establish the prevalence (P) of structural lesions and to compare four TP-ur methods, one hundred and five 24 h urine collection, selected by dipstick urinalysis values (DUV), were analyzed. Coomassie Brilliant Blue G-250(CBB)/Sulphosalicylic Acid (SSA) (in-house manually developed methods) and benzethonium-chloride(BZT)/ pyrogallol red-molybdate(PRM) (Hitachi-917 analyzer) were employed. Two samples containing >2 g/L of Bence Jones protein (BJP) were assayed. SDS-PAGE and conventional zone electrophoresis (ZE), both stained with the silver stain procedure were developed. The data showed consistency in detecting a P of GiT (16%) and iT (33%) for negative DUV. 1+/2+ DUV presented a P of 33%, 30% for GiT with a partially conserved selectivity, and 26%, 57% of a GcT PP, respectively. In 3+ DUV a GcT PP was 66%, with non-selective profile. Statistically significant correlation coefficients (p2 g/L TP-ur must be performed by diluting the sample to get useful clinical information.

Keywords : Kidney disease; Urine protein; Sodium dodecylsulfate polyacrilamide gel electrophoresis; Bence Jones protein; Benzethonium-chloride.

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