Original ArticleN-Oleoylethanolamine Reduces Inflammatory Cytokines and Adhesion Molecules in TNF-α-induced Human Umbilical Vein Endothelial Cells by Activating CB2 and PPAR-αXu, Xudong MS*; Guo, Han MS†; Jing, Zuo MS†; Yang, Lichao PhD†; Chen, Caixia MS†; Peng, Lu MS†; Wang, Xiaoqing MS*; Yan, Lu MS*; Ye, Rongting MS‡; Jin, Xin PhD†; Wang, Yiqing MD, PhD*Author Information *Department of Cardiology, Zhongshan Hospital of Xiamen University, Xiamen, China; †Department of Basic Medical Sciences, Medical College, Xiamen University, Xiamen, China; and ‡Union Clinical College of Fujian Medical University, Fuzhou, China. Reprints: Yiqing Wang, MD, PhD, Department of Cardiology, Zhongshan Hospital of Xiamen University, Xiamen, Fujian Province 361005, China (e-mail: [email protected]) or Xin Jin, PhD, Department of Basic Medical Sciences, Medical college, Xiamen University, 361005 Xiamen, Fujian Province, China (e-mail: [email protected]). Supported by grants from the National Natural Science Foundation of China (Grant No. 81373407) and the Science and Technology Key Program of Fujian Province (No. 2013D024). The authors report no conflicts of interest. Journal of Cardiovascular Pharmacology: October 2016 - Volume 68 - Issue 4 - p 280-291 doi: 10.1097/FJC.0000000000000413 Buy Metrics Abstract Inflammation plays a pivotal role in the pathogenesis of atherosclerosis. Peroxisome proliferator-activated receptor-alpha (PPAR-α) and cannabinoid receptor 2 (CB2) crucially impact the modulation of inflammation. N-Oleoylethanolamine (OEA), a natural agonist of PPAR-α, can also up-regulate the expression of CB2 in human umbilical vein endothelial cells (HUVECs) and further shows an antiatherosclerotic effect. Our study was designed to determinate whether OEA could inhibit inflammation in HUVECs induced by tumor necrosis factor-α (TNF-α) and to identify the mechanism of OEA function. Interleukin-6 (IL-6), interleukin-8 (IL-8), vascular adhesion molecule-1 (VCAM-1), and intercellular adhesion molecule-1 (ICAM-1) levels were detected in HUVECs exposed to tumor necrosis factor-α in the presence of OEA. The results showed that OEA suppressed the expression of interleukin-6, interleukin-8, vascular adhesion molecule-1, and intercellular adhesion molecule-1 in a dose-dependent manner. OEA also enhanced CB2 and PPAR-α receptor expression, which contributed to its anti-inflammatory effect. OEA inhibited the nuclear factor-κB (NF-κB) pathway, and the effect of OEA on nuclear factor-κB was partly abolished when HUVECs were pretreated with either CB2 or PPAR-α antagonist. OEA attenuated tumor necrosis factor-α-induced inflammation in HUVECs by up-regulating the expression of CB2 and PPAR-α receptors. Furthermore, OEA suppresses the nuclear factor-κB pathway. These results suggest that OEA exerts anti-inflammatory and anti-adhesive effects on HUVECs. Copyright © 2016 Wolters Kluwer Health, Inc. All rights reserved.