TWEAK/Fn14 promotes oxidative stress through AMPK/PGC‑1α/MnSOD signaling pathway in endothelial cells

Liu,Hengdao; Peng,Hui; Xiang,Hong; Guo,Lingli; Chen,Ruifang; Zhao,Shaoli; Chen,Wei; Chen,Pan; Lu,Hongwei; Chen,Shuhua

doi:10.3892/mmr.2017.8090

TWEAK/Fn14 promotes oxidative stress through AMPK/PGC‑1α/MnSOD signaling pathway in endothelial cells

Authors:
- Hengdao Liu
- Hui Peng
- Hong Xiang
- Lingli Guo
- Ruifang Chen
- Shaoli Zhao
- Wei Chen
- Pan Chen
- Hongwei Lu
- Shuhua Chen
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Affiliations: Center for Experimental Medical Research, The Third Xiangya Hospital of Central South University, Changsha, Hunan 410013, P.R. China, Department of Critical Care Medicine, The First Affiliated Hospital of Xinxiang Medical University, Xinxiang, Henan 453100, P.R. China, Department of Biochemistry, School of Life Sciences, Central South University, Changsha, Hunan 410013, P.R. China
Published online on: November 15, 2017 https://doi.org/10.3892/mmr.2017.8090
Pages: 1998-2004

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Abstract

Tumor necrosis factor-like weak inducer of apoptosis (TWEAK) contributes to dysfunction of endothelial cells via its receptor, Fn14. However, its role in the production of reactive oxygen species (ROS), particularly mitochondrial ROS (mtROS) and the subsequent decrease in nitric oxide (NO) in endothelial cells remains unclear. In this study, the effect of TWEAK/Fn14 on generation of ROS, mtROS and NO in endothelial cells and its potential mechanism was investigated. Human umbilical vein endothelial cells (HUVECs) were treated with TWEAK with Fn14 small interfering (si)RNA or negative control RNA. It was demonstrated that TWEAK induced the production of ROS and mtROS in HUVECs, which were detected by fluorescent microscope, and flow cytometry. In addition, TWEAK decreased the generation of NO as indicated using the Nitric Oxide Assay kit. Furthermore, TWEAK aggravated mtDNA damage as measured by quantitative polymerase chain reaction analysis. Inhibition of Fn14 by Fn14 siRNA decreased TWEAK‑induced ROS and mtROS production, as well as mtDNA damage, while it increased the production of NO in endothelial cells. In addition, TWEAK inhibited the expression of active AMP‑activated protein kinase (AMPK) and its downstream protein peroxisome proliferator‑activated receptor‑γ coactivator-1α (PGC‑1α) and manganese superoxide dismutase (MnSOD). Notably, Fn14 siRNA enhanced the expression of the aforementioned proteins. Taken together, TWEAK/Fn14 contributes to endothelial dysfunction through modulation of ROS and mtROS. In addition, the underlying mechanism is implicated in the AMPK/PGC‑1α/MnSOD signaling pathway.

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