Expression of LP-PLA2 mRNA in peripheral blood monocytes subsets of patients with type 2 diabetes mellitus / 中华内分泌代谢杂志

ABSTRACT

Objective To investigate the role of monocyte subsets in the pathogenesis of type 2 diabetes mellitus(T2DM), the expression was detected on lipoprotein-associated phospholipase A2(LP-PLA2) mRNA in peripheral blood monocytes subsets of type 2 diabetic patients. Methods After the peripheral blood of 32 type 2 diabetic patients and 22 healthy controls were collected,the percentages of the monocytes subsets were detected by flow cytometry. The expression of LP-PLA2 mRNA in monocytes subsets were detected by PCR. After monocyte subsets of healthy subjects were induced into macrophages and stimulated by the serum of type 2 diabetic patients for 24h,LP-PLA2 mRNA expression was detected. Results Compared with the control group, the percentage of classical monocytes in T2DM group was decreased, while the LP-PLA2 mRNA expression and percentage of nonclassical,intermediate monocytes were significantly increased(all P<0.05). In addition,the homeostasis model assessment for insulin resistance index was positively correlated with LP-PLA2 mRNA expression in non-classical(P<0.05)and intermediate monocytes(P<0.01)of type 2 diabetic patients. Compared with type 2 diabetic patients without carotid atherosclerosis, the levels of LP-PLA2 mRNA in intermediate and nonclassical monocytes were significantly higher than those in type 2 diabetic patients with carotid atherosclerosis(P<0.05). The level of LP-PLA2 mRNA in non-classical monocytes-derived macrophages stimulated with the serum of type 2 diabetic patients was significantly higher than that in the control group(P<0.05). Conclusion Monocytes subsets from type 2 diabetic patients are abnormally skewed toward to intermediate and non-classical monocytes with high expression of LP-PLA2 mRNA,which may play an important role in the pathogenesis of type 2 diabetes mellitus and atherosclerosis.