Short-Term Effects of Extended-Release Niacin With and Without the Addition of Laropiprant on Endothelial Function in Individuals With Low HDL-C: A Randomized, Controlled Crossover Trial

Abstract Background Reduced plasma concentration of high-density lipoprotein cholesterol (HDL-C) is associated with vulnerability to oxidative stress and propensity to endothelial dysfunction. Niacin directly activates both GPR-109A in leukocytes and the heme oxygenase-1 pathway, promoting strong anti-inflammatory and antioxidative effects, as well as induces immediate production of prostaglandin D2, leading to endothelial vasodilation. Objective This study investigated the short-term effects of extended-release niacin (ERN) administered with or without the prostaglandin D2 receptor antagonist laropiprant on endothelial function in patients with low HDL-C. Methods Asymptomatic men and women aged between 20 and 60 years who had plasma HDL-C levels