Resolvin D1 attenuates inflammation in lipopolysaccharide-induced acute lung injury through a process involving the PPARγ/NF-κB pathway

被引:131
作者
Liao, Zenglin [1 ,2 ]
Dong, Jiajia [1 ,2 ]
Wu, Wei [1 ,2 ]
Yang, Ting [1 ,2 ]
Wang, Tao [1 ,2 ]
Guo, Lingli [1 ,2 ]
Chen, Lei [1 ,2 ]
Xu, Dan [1 ,2 ]
Wen, Fuqiang [1 ,2 ]
机构
[1] Sichuan Univ, W China Hosp, Div Pulm Dis, State Key Lab Biotherapy China, Chengdu 610041, Sichuan, Peoples R China
[2] Sichuan Univ, W China Hosp, Dept Resp Med, Chengdu 610041, Sichuan, Peoples R China
来源
RESPIRATORY RESEARCH | 2012年 / 13卷
基金
中国国家自然科学基金;
关键词
Acute lung injury; Docosahexaenoic acid; Lipid mediators; NF-kappa B; Peroxisome proliferator-activated receptor gamma; Resolvin D1; RESPIRATORY-DISTRESS-SYNDROME; LIPID MEDIATORS; ANTIINFLAMMATORY PROPERTIES; THERAPEUTIC STRATEGY; CYTOKINE PRODUCTION; FATTY-ACIDS; RESOLUTION; OMEGA-3-FATTY-ACIDS; ACTIVATION; MECHANISMS;
D O I
10.1186/1465-9921-13-110
中图分类号
R56 [呼吸系及胸部疾病];
学科分类号
摘要
Background: Docosahexaenoic acid (DHA) and DHA-derived lipid mediators have recently been shown to possess anti-inflammatory and pro-resolving properties. In fact, DHA can down-regulate lipolysaccharide (LPS)-induced activation of NF-kappa B via a PPAR gamma-dependent pathway. We sought to investigate the effects of the novel DHA-derived mediator resolvin D1 (RvD1) on LPS-induced acute lung injury and to determine whether these effects occur via a PPAR gamma-dependent pathway. Methods: BALB/c mice aged 6-8 weeks were randomly divided into seven groups: two control groups receiving saline or RvD1 (600 ng) without LPS; a control group receiving LPS only; an experimental group receiving RvD1 (300 ng) or RvD1 (600 ng), followed by LPS; a group receiving the PPAR gamma antagonist GW9662; and a group receiving GW9662, then RvD1 (600 ng) and finally LPS. LPS (50 mu M) and saline were administered intratracheally. RvD1 was injected intravenously 24 h and 30 min before LPS, while GW9662 was injected intravenously 30 min before RvD1. Mice were killed at 6, 12, and 24 h. Samples of bronchoalveolar lavage fluid (BALF) were analyzed for cell counts and cytokine analysis. Lung tissues were collected for histology, Western blotting and electrophoretic mobility shift assays (EMSAs). Results: At all three time points, groups receiving either dose of RvD1 followed by LPS had significantly lower total leukocyte counts and levels of TNF-alpha and IL-6 levels in BALF than did the group given only LPS. RvD1 markedly attenuated LPS-induced lung inflammation at 24 h, based on hematoxylin-eosin staining of histology sections. RvD1 activated PPAR gamma and suppressed I kappa Ba degradation and NF-kappa B p65 nuclear translocation, based on Western blots and EMSAs. The PPAR gamma inhibitor GW9662 partially reversed RvD1-induced suppression of I kappa Ba degradation and p65 nuclear translocation. Conclusions: These results suggest that RvD1 may attenuate lung inflammation of LPS-induced acute lung injury by suppressing NF-kappa B activation through a mechanism partly dependent on PPAR gamma activation.
引用
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页数:11
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