The glucagon-like peptide 1 analog liraglutide reduces TNF-伪-induced oxidative stress and inflammation in endothelial cells

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• 作者：Aya Shiraki ; Jun-ichi Oyama ; ^{junoyama@cc.saga-u.ac.jp} ; Hiroshi Komoda ; Machiko Asaka ; Aiko Komatsu ; Masashi Sakuma ; Kazuhisa Kodama ; Yoshiko Sakamoto ; Norihiko Kotooka ; Tetsuaki Hirase ; Koichi Node
• 关键词：Oxidative stress ; Inflammation ; Apoptosis ; NF-魏B ; Endothelial cell
• 刊名：Atherosclerosis
• 出版年：2012
• 期刊代码：28_00219150
• 类别：med
• 出版时间：April, 2012
• 卷：221
• 期：2
• 页码：375-382
• 文件大小：945 K

摘要

Objective

Glucagon-like peptide 1 (GLP-1), one of the incretin hormones, has been reported to increase positive inotropic activity in cardiac myocytes and protect against myocardial injury. However, the effects upon endothelial cells and the mechanisms involved are not fully understood. We assessed the hypothesis that GLP-1 has protective effects against inflammation and oxidative stress on human endothelial cells.

Methods and results

The effects of the GLP-1 analog liraglutide upon TNF-伪-induced injury of the human umbilical vein endothelial cells (HUVECs) were evaluated. First, ROS induced by TNF-伪 was measured by staining with CM-H₂DCFDA. Intracellular ROS production of HUVECs was significantly decreased in a dose-dependent manner until 30 nM while liraglutide inhibited the induction of gp91^phox and p22^phox, subunit of NADPH oxidase, by TNF-伪鈰?In addition, protein levels of SOD-2, catalase and GPx were significantly increased by liraglutide. Second, rapid translocation of PKC-伪 into the membrane following TNF-伪 was evident. Liraglutide significantly inhibited this very rapid TNF-伪-induced translocation of PKC-伪 into membrane at 2.5 min. Third, liraglutide significantly inhibited NF-魏B activation and upregulated I-魏B family while phosphorylation of IKK-伪/尾, which is upstream of NF-魏B signaling, was also downregulated after 15 min of TNF-伪 treatment. Finally, liraglutide inhibited apoptosis of HUVEC and expression of Pentraxin-3 induced by TNF-伪.

Conclusion

Liraglutide exerts marked anti-oxidative and anti-inflammatory effects on endothelial cells with inhibition of PKC-伪, NADPH oxidase, NF-魏B signaling and upregulation of protective anti-oxidative enzymes.