Lipidomic analysis revealed a diabetes-specific increase (p < 0.05) in inflammatory and angiogenic eicosanoids including the 5-lipoxygenase-derived LTB4 (4.11 ¡À 1.17 vs. 0.96 ¡À 0.27 ng/ml), the lipoxygenase/CYP-derived 12-HETE (117.08 ¡À 35.05 vs. 24.34 ¡À 10.03 ng/ml), 12-HETrE (17.56 ¡À 4.43 vs. 4.15 ¡À 2.07 ng/ml), and the CYP-derived 20-HETE (0.32 ¡À 0.04 vs. 0.06 ¡À 0.05 ng/ml) the level of which correlated with BMI (p = 0.0027). In contrast, levels of the CYP-derived EETs were not significantly (p = 0.36) different between these two groups. EPC levels and their colony-forming units were lower (p < 0.05) with a reduced viability in diabetic patients compared with non-diabetics. EPC function (colony-forming units (CFUs) and MTT assay) also negatively correlated with the circulating levels of HgA1C.
This study demonstrates a close association between elevated levels of highly pro-inflammatory eicosonoids, diabetes and EPC dysfunction in patients with cardiac ischemia, indicating that chronic inflammation impact negatively on EPC function and angiogenic capacity in diabetes.