Proteome analysis of serum from type 2 diabetics with nephropathy

Hyun Jung Kim, Eun Hee Cho, Ji Hye Yoo, Pan Kyeom Kim, Jun Seop Shin, Mi Ryung Kim, Chan Wha Kim

Research output: Contribution to journalArticlepeer-review

77 Citations (Scopus)


Diabetic nephropathy (DN) is a renal disease which develops as a consequence of diabetes mellitus. Microalbuminuria is the earliest clinical sign of DN. There are no specific diagnostic biomarkers for type 2 diabetics with nephropathy other than microalbuminuria and macroalbuminuria. However, microalbuminuria does not constitute a sole independent indicator for type 2 diabetics with nephropathy, and thus, another screening method, such as a biomarker assay, is required in order to diagnose it more correctly. Therefore, we have utilized two-dimensional electrophoresis (2-DE) to identify human serum protein markers for the more specific and accurate prediction of progressive nephropathy in type 2 diabetes patients, via comparisons of the serum proteome in three experimental groups: type 2 diabetes patients without microalbuminuria (DM, n = 30), with microalbuminuria (MA, n = 29), and with chronic renal failure (CRF, n = 31). As a result, proteins which were differentially expressed with statistical significance (p < 0.05) in MA and CRF groups as compared to those in DM group were selected and identified by ESI-Q-TOF MS/MS. Among these identified proteins, two proteins which might be useful as diagnostic biomarkers of type 2 diabetics with nephropathy were verified by Western blotting: extracellular glutathione peroxidase (eGPx) and apolipoprotein (ApoE) were found to exhibit a progressive reduction in MA and CRF groups. Notably, eGPx was further verified by ELISA using DM (n = 100) and MA (n = 96) patient samples. Collectively, our results show that the two proteins identified in this study may constitute potential biomarkers for the diagnosis of type 2 diabetics with nephropathy.

Original languageEnglish
Pages (from-to)735-743
Number of pages9
JournalJournal of Proteome Research
Issue number2
Publication statusPublished - 2007 Feb


  • 2-DE
  • ApoE
  • Diabetic nephropathy
  • Serum
  • eGPx

ASJC Scopus subject areas

  • Biochemistry
  • General Chemistry


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