The Difference Quantity of Urinary Peptides between Two Groups of Type 2 Diabetic Patients with or without Coronary Artery Disease

Abstract EN

Objectives.

We aim to explore urinary biomarkers that could monitor CAD in type 2 diabetic patients.

Materials and Methods.

Urine samples from two groups, twenty-eight type 2 diabetic patients with coexisting CAD and thirty type 2 diabetic patients without CAD, were purified by MB-WCX and then analyzed by MALDI-TOF-MS.

Subsequently, we compared the urinary peptide signatures of the two groups by use of ClinProTools2.1 and evaluated the potential ability of the differently expressed peptides to distinguish type 2 diabetic patients with coexisting CAD from type 2 diabetic patients without CAD by ROC analysis.

Finally, the differently expressed peptides were identified by nanoliquid chromatography-tandem mass spectrometry.

Results.

There were six differently expressed peptides (m/z 1305.2, 1743.9, 2184.9, 2756.1, 3223.2, and 6196.1) between the two groups of subjects, and they were identified as fragments of isoform 1 of fibrinogen alpha chain precursor, prothrombin precursor, and interalpha-trypsin inhibitor heavy chain H4.

The diagnostic efficacy of m/z 2756.1 and m/z 3223.2 was better than the other peptides.

Area under ROC of the m/z 2756.1, and m/z 3223.2 was 0.98 and 0.93, respectively.

Conclusions.

These urinary peptides are potential urinary biomarkers for monitoring of type 2 diabetic patients with CAD.