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Identification and validation of six proteins as marker for endemic nephropathy

Authors
Journal
Journal of Proteomics
1874-3919
Publisher
Elsevier
Publication Date
Volume
74
Issue
10
Identifiers
DOI: 10.1016/j.jprot.2011.05.020
Keywords
  • Endemic Nephropathy
  • Urine Proteomics
  • Biomarker
  • Ckd
  • 2-D Dige
Disciplines
  • Biology
  • Medicine

Abstract

Abstract Endemic nephropathy (EN) is defined as a slow progressive renal tubulointestitial disease that mainly occurs in the restricted areas of the Balkan Peninsula. The complexity of the pathogenesis of EN makes its earlier diagnosis very difficult. Urine samples from healthy volunteers from EN regions, EN patients with proteinuria less than 150mg/L and EN patients with proteinuria more than 150mg/L, patients with acute kidney injury, patients with diabetic nephropathy and healthy volunteers from Germany were collected. The urinary proteome analyses were performed using 2-D DIGE and mass spectrometry. The validation of biomarkers was investigated by two approaches (Western blot (WB) and dot blot) in successively increasing size – and partially overlapping – sample sets. Comparative and statistical analyses of the proteomics data from the different patient groups allowed the identification of six proteins (alpha-1-microglobulin, alpha-2-glycoprotein-1, beta-2-microglobulin, mannose-binding-lectin-2, protection-of-telomeres-protein-1, and superoxide-dismutase [Cu–Zn]), which were able to discriminate EN with low and high proteinuria from the other groups with high significance (p<0.05). The reliability of the identified proteins as EN marker was underlined with high statistical significance using WB analyses (sensitivity 66.7-98% and specificity 70-100%), whereas the dot blot analyses revealed a decrease in the sensitivity and specificity of these biomarkers.

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