Prostaglandins, Leukotrienes and Essential Fatty Acids (PLEFA) 2015-03-01

Epoxyeicosatrienoic acids attenuate cigarette smoke extract-induced interleukin-8 production in bronchial epithelial cells.

Wen-Jiang Ma, Yan-Hong Sun, Jun-Xia Jiang, Xin-Wei Dong, Jian-Ying Zhou, Qiang-Min Xie

Index: Prostaglandins Leukot. Essent. Fatty Acids 94 , 13-9, (2015)

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Abstract

In response to endothelial cell activation, arachidonic acid can be converted by cytochrome P450 (CYP) epoxygenases to epoxyeicosatrienoic acids (EETs), which have potent vasodilator and anti-inflammatory properties. In this study, we investigated the effects of exogenous EETs on cigarette smoke extract (CSE)-induced inflammation in human bronchial epithelial cells (NCI-H292). We found that CSE inhibited the expression of CYP2C8 and mildly stimulated the expression of epoxide hydrolase 2 (EPHX2) but did not change the expression of CYP2J2. Treatment with 11,12-EET or 14,15-EET attenuated the CSE-induced release of interleukin (IL)-8 by inhibiting the phosphorylation of p38 mitogen-activated protein kinases (MAPKs). Our results demonstrated that CSE may reduce the anti-inflammatory ability of epithelial cells themselves by lowering the EET level. EETs from pulmonary epithelial cells may play a critical protective role on epithelial cell injury. Copyright © 2014 Elsevier Ltd. All rights reserved.