The association between the D166E polymorphism of the lipoprotein associated phospholipase A2 and risk of myocardial infarction.

OBJECTIVE: Although numerous studies have evaluated the association between lipoprotein associated phospholipase A2 (Lp-PLA2) gene polymorphisms and coronary heart disease, the conclusions are still inconsistency. Here we detected the correlation between D166E polymorphism of Lp-PLA2 and myocardial infarction (MI). Further, its clinical value as biomarker was assessed. PATIENTS AND METHODS: A total of 297 patients were enrolled, all diagnosed as MI at the Hebei General Hospital between May 2017 and May 2018, with 262 healthy subjects recruited as controls. Blood specimens of all participants were collected for testing serum lipid, blood glucose, Lp-PLA2, HsCRP, IL-17 and IL-35. The D166E polymorphism was genotyped. The correlation between D166E polymorphism and MI was explored using multiple logistic regression analysis. RESULTS: We detected higher levels of TC, TG, LDLC, Lp-PLA2, HsCRP and IL-17 but lower levels of HDLC and IL-35 in MI patients, compared with healthy controls (p<0.05). Also, the positive ratio of family history is higher in MI patients than that in control. Indexes were collected after one-week and one-month hospitalization, respectively, and levels of Lp-PLA2. HsCRP, IL-17 and IL-35 decreased to the normal levels (p>0.05). We also observed positive correlations between Lp-PLA2 with HsCRP and IL-17 (r=0.6517, 0.2689), and negative correlations between IL-35 with Lp-PLA2, HsCRP and IL-17 (r=-0.3142. -0.3968. -0.2516), respectively. The G allele at D166E accounted for a higher percentage in MI patients than in controls, and so as the GG and GC genotypes (p<0.05). Logistic regression analysis showed close associations between MI with Lp-PLA2 and GG genotype at D166E, with odds ratios of 1.239 (1.023-2.017) and 9.863 (4.107-21.331), which suggested they were independent risk factors for the development of coronary heart disease. CONCLUSIONS: The D166E (C/G) mutation of Lp-PLA2 was a potential risk factor of MI.