Relationship between Plasma Lipoprotein-Associated Phospholipase A2 Concentrations and Apolipoprotein in Stable Coronary Artery Disease Patients

Background. Increasing evidence states that the plasma lipoprotein-associated phospholipase A2 (Lp-PLA2) levels and apolipoprotein particles are regarded as the risk maker for cardiovascular heart disease. Nevertheless, the issue about whether Lp-PLA2 is associated with apolipoprotein particles in individuals who have been diagnosed as stable coronary artery disease (CAD) remains largely unexplored. Method. All 569 participants engaged in this research, who never took lipid-lowering drugs, had been divided into groups by the coronary angiography (CAG), namely, stable CAD: n=291 ; non-CAD: n=278 . The results concerning Lp-PLA2 levels were calculated by Elisa Kit, while apolipoprotein particles were measured by the department of laboratory. Results. The plasma concentration of Lp-PLA2 was remarkably higher in stable CAD group than the non-CAD group ( 136.0±60.5 ng/mL vs. 113.2±65.6 ng/mL , P<0.001 ). Pearson correlation analyses explained the plasma Lp-PLA2 concentration was correlated with apoB ( r=0.390 , P<0.001 ) and apoB/apoA1 ( r=0.450 , P<0.001 ), not associated with apoA1 ( r=−0.099 , P=0.101 ). Conversely, the association remains unobserved among non-CAD patients except apoA1. Moreover, multiple linear regression revealed the relations between Lp-PLA2 concentrations and apoB ( β=0.390 , P<0.001 ), as well as apoB/apoA1 ( β=0.450 , P<0.001 ), but not apoA1 ( β=−0.099 , P=0.121 ). After adjustment for several risk factors regarding CAD, like hypertension, gender, smoking, age, and diabetes mellitus, there had still been positive associations between the Lp-PLA2 concentration and apoB ( β=0.364 , P<0.001 ), as well as apoB/apoA1 ( β=0.390 , P<0.001 ). Conclusion. The plasma levels of Lp-PLA2 provide positively a key link with apoB, apoB/apoA-1 among stable CAD, denoting the communication between Lp-PLA2 and apolipoprotein particles in the state of CAD.