Higher lipoprotein-associated phospholipase A2 levels are associated with coronary atherosclerosis documented by coronary angiography

Background: Lipoprotein-associated phospholipase A2 (Lp-PLA2) has been proposed as an inflammatory marker of cardiovascular disease. The present study investigates associations between Lp-PLA2 and other important biomarkers in Japanese patients with coronary artery disease. Methods: We measured Lp-PLA2 levels in 141 consecutive patients (age 62.6 +/- 3.8 years; men 69.2%) with angiographic evidence of coronary artery disease (acute coronary syndrome [ACS]; n = 38), stable angina pectoris (SAP; n = 72) or with angiographically normal coronary arteries (NCA; n = 31). Results: Levels of Lp-PLA2 significantly correlated with low-density lipoprotein-cholesterol (r = 0.302), homocysteine (r = 0.528) and paraoxonase (r = 0.401) in all patients (all P < 0.01). Levels of Lp-PLA2 were significantly higher in patients with coronary atherosclerosis (ACS and SAP) than with NCA (P < 0.05). Levels of highly sensitive C-reactive protein were significantly higher in patients with ACS than with SAP and NCA (both P < 0.05). Multivariate logistic regression analyses revealed that higher Lp-PLA2 levels were independently associated with coronary atherosclerosis (odds ratio: 1.058; 95% confidence interval: 1.012-1.121; P = 0.001). Conclusions: Higher Lp-PLA2 levels are associated with coronary atherosclerosis independently of traditional coronary risk factors. Thus, Lp-PLA2 is a novel biomarker of coronary atherosclerosis in Japanese patients. Ann Clin Biochem 2012; 49: 527-533. DOI: 10.1258/acb.2012.011252