Plasma levels of lipoprotein-associated phospholipase A2 and secretory phospholipase A2 in patients with newly diagnosed type 2 diabetes and their relationships to atherosclerosis

Objective To evaluate plasma concentrations of lipoprotein-associated phospholipase A2(LP-PLA2)and secretory phospholipase A2(sPLA2)in patients with newly diagnosed type 2 diabetes, and to explore their clinical significance. Methods Oral glucose tolerance test(OGTT)was carried out in our hospital to all the subjects without history of diabetes. According to the results of OGTT, they were divided into two groups: patients with newly diagnosed type 2 diabetes and subjects with normal fasting glucose and normal glucose tolerance. Anthropometric data such as height, weight, waist circumference, and blood pressure were measured and concentrations of blood glucose, insulin, lipid profile(including total cholesterol, triglycerides, low density lipoprotein-cholesterol, high density lipoprotein-cholesterol), LP-PLA2, and sPLA2 were determined in both groups. Results Ninety patients with newly diagnosed type 2 diabetes and fifty-eight subjects with normal glucose tolerance were enrolled in our study. As to gender, age, body mass index, blood pressure, and lipid profile, there were no statistically differences between these two groups(P>0.05). Plasma levels of LP-PLA2 and sPLA2 in diabetic patients were significantly higher than normoglycemic participants [102.98(76.34, 134.31)vs 50.89(23.71, 90.40)ng/ml, 219.33(130.03, 337.330)vs 78.55(75.15, 87.02)ng/ml, both P<0.01]. Plasma concentrations of LP-PLA2 and sPLA2 in diabetic patients with atherosclerosis were significantly higher than those without [133.43(111.54, 145.17)vs 99.11(63.02, 130.85)ng/ml, 235.73(180.48, 416.46)vs 182.97(9.08, 280.79)ng/ml, both P<0.05]. LP-PLA2 and sPLA2 were both positively correlated with homeostasis model assessment for insulin resistance(HOMA-IR), while negatively correlated with insulin function index. In a multiple linear regression analysis, LP-PLA2 and sPLA2 were independent correlative factors of HOMA-IR(both P<0.05). Conclusions Plasma levels of LP-PLA2 and sPLA2 were significantly higher in patients with newly diagnosed type 2 diabetes than in individuals with normal glucose tolerance, even more significant in diabetic patients with atherosclerosis. And their concentrations were both closely related to insulin resistance. (Chin J Endocrinol Metab, 2016, 32: 470-474) Key words: Diabetes mellitus, type 2; Newly-diagnosed; Lipoprotein-associated phospholipase A2; Secretory phospholipase A2