Abstract
AIMS Statins are known to influence the status of adipokines, which play a key role in the pathophysiology of cardiometabolic diseases. As the effect of ezetimibe as an add-on to statin therapy on the impact of statins on plasma adipokines levels is currently unclear, the aim of the present study was to investigate this through a meta-analysis of controlled trials.
METHODS A systematic review was performed, followed by a bibliographic search in PubMed, Medline, SCOPUS, Web of Science and Google Scholar databases. Quantitative data synthesis was performed using a fixed- or random-effects model (based on the level of interstudy heterogeneity) and the generic inverse variance weighting method.
Effect sizes were expressed as standardized mean difference (SMD) and 95% confidence interval (CI). RESULTS Meta-analysis of 23 controlled trials did not suggest any significant effect of adding ezetimibe on top of statin therapy on plasma concentrations of adiponectin (SMD 0.34, 95% CI -0.28, 0.96; P = 0.288), leptin (SMD -0.75, 95% CI: -2.35, 0.85; P = 0.360), plasminogen activator inhibitor 1 (SMD -1.06, 95% CI: -2.81, 0.69; P = 0.236) and interleukin 6 (SMD 0.30, 95% CI: -0.08, 0.67; P = 0.124).
However, significantly greater reductions in plasma concentrations of tumour necrosis factor alpha (TNF-alpha) (SMD -0.48, 95% CI -0.87, -0.08; P=0.018) were achieved with ezetimibe/statin combination therapy. CONCLUSIONS The results suggested that ezetimibe add-on to statin therapy is associated with an enhanced TNF-alpha-lowering effect compared with statin monotherapy.
Owing to the emerging role of TNF-alpha in the pathogenesis of metabolic disorders, further investigations are required to unveil the translational relevance of this TNF-alpha-lowering effect.