Lp-PLA2 levels in HIV-infected patients.

INTRODUCTION: HIV-infected patients show an increased risk of cardiovascular disease (CVD). In the general population, lipoprotein-associated phospholipase A2 (Lp-PLA2) appears to be an independent predictor of CVD. We aimed to study associations between Lp-PLA2 plasma levels and other risk factors for CVD in HIV patients.

MATERIALS AND METHODS: A cross-sectional, comparative study of two series of cases (HIV patients, n=116 and age-matched non-HIV healthy controls, n=113) was conducted. Eighty-seven percent HIV patients on antiretroviral therapy (ART), 72.4% with HIV-1 viral load <50 cop/mL. Inflammatory biomarkers (CRP, Lp-PLA2) and internal carotid intima-media thickness (IMT) were measured and CVD risk (Framingham and SCORE algorithms) was calculated. Univariate and multivariable associations between these variables were performed.

RESULTS: HIV patients presented higher Lp-PLA2 levels [276.81 ng/mL (209.71-356.58)] than uninfected healthy controls [220.80 ng/mL (172.70-256.90)], p≤0.01. In univariate analysis of the global sample, only cigarette smoking was associated with higher Lp-PLA2 levels, p≤0.001. In HIV group, female and smoker patients showed higher Lp-PLA2 levels, p≤0.05. No significant association was found between Lp-PLA2 levels and another CVD risk factors, carotid IMT, Framingham and SCORE algorithms, ART, HIV-1 viral load neither and CD4+ T lymphocyte count. In multivariate analysis, cigarette smoking remained significantly associated with Lp-PLA2 levels [β=64.8 (95% CI 10.8-118.9) ng/mL, p=0.020].

CONCLUSIONS: HIV-infected patients present higher Lp-PLA2 levels than healthy controls, and in this population, tobacco smoking is significantly associated with increased Lp-PLA2 levels. Smoking cessation should be a priority in CVD prevention in HIV-infected patients.