Elevation of serum oxLDL/β2-GPI complexes was correlated with diabetic microvascular complications in Type 2 diabetes mellitus patients.

Abstract

High levels of oxLDL/β2-GPI complexes might be a consequence of LDL atherogenic modification mediated by oxidative stress. We aimed to determine whether the levels of serum oxLDL/β2-GPI complexes were correlated with diabetic microvascular complications in type 2 diabetes mellitus (T2DM) patients. Levels of oxLDL/β2-GPI complexes, oxLDL, routine lipid/lipoprotein parameters were measured in 100 healthy controls, 128 T2DM patients without any microvascular complications, and 172 T2DM patients with microvascular complications. Spearman's correlation, multivariable linear regression logistic regression analysis, and receiver operating characteristic (ROC) curve were performed. Levels of serum oxLDL/β2-GPI complexes and oxLDL were significantly higher in T2DM patients with microvascular complications (oxLDL/β2-GPI complexes: 1.10 ± 0.18 U/mL; oxLDL: 48.12 ± 7.24 mmol/L) than those in T2DM patients without microvascular complications (oxLDL/β2-GPI complexes: 0.98 ± 0.16 U/mL; oxLDL: 41.45 ± 6.81 mmol/L) and controls (oxLDL/β2-GPI complexes: 0.79 ± 0.15 U/mL; oxLDL: 27.85 ± 5.32 mmol/L). Variables that remained significantly associated with oxLDL/β2-GPI complexes were oxLDL (β = 0.568, P < 0.001), TC (β = 0.312, P = 0.013) and microvascular complications (β = 0.205, P = 0.027), which accounted for 58.3% of the variation of the level of oxLDL/β2-GPI complexes in T2DM patients (R2 = 0.583). Logistic regression analysis demonstrated that elevation of oxLDL/β2-GPI complexes (OR = 3.14, 95% CI: 1.04-9.46, P = 0.042) and oxLDL levels (OR = 3.02, 95% CI: 1.16-7.83, P = 0.023) were independently associated with occurrence of microvascular complications. Cutoff value of oxLDL/β2-GPI for the presence of microvascular complications was 1.05 U/mL, and AUC area of ROC curve was 0.783 (95%CI: 0.713-0.853), yielding a sensitivity of 86.8% and specificity of 64.9%. Elevation of serum oxLDL/β2-GPI complexes was associated with microvascular complications in T2DM patients.