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Open AccessArticle

C1q/TNF-Related Protein-9 Ameliorates Ox-LDL-Induced Endothelial Dysfunction via PGC-1α/AMPK-Mediated Antioxidant Enzyme Induction

by Haijian Sun 1,†, Xuexue Zhu 1,†, Yuetao Zhou 1, Weiwei Cai 1 and Liying Qiu 1,2,*
Department of Basic Medicine, Wuxi School of Medicine, Jiangnan University, Wuxi 214122, China
Department of Basic Medicine, Wuxi Medical School, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, China
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Neal Weintraub
Int. J. Mol. Sci. 2017, 18(6), 1097;
Received: 26 April 2017 / Revised: 16 May 2017 / Accepted: 17 May 2017 / Published: 26 May 2017
(This article belongs to the Special Issue Oxidative Stress in Vascular Diseases)
Oxidized low-density lipoprotein (ox-LDL) accumulation is one of the critical determinants in endothelial dysfunction in many cardiovascular diseases such as atherosclerosis. C1q/TNF-related protein 9 (CTRP9) is identified to be an adipocytokine with cardioprotective properties. However, the potential roles of CTRP9 in endothelial function remain largely elusive. In the present study, the effects of CTRP9 on the proliferation, apoptosis, migration, angiogenesis, nitric oxide (NO) production and oxidative stress in human umbilical vein endothelial cells (HUVECs) exposed to ox-LDL were investigated. We observed that treatment with ox-LDL inhibited the proliferation, migration, angiogenesis and the generation of NO, while stimulated the apoptosis and reactive oxygen species (ROS) production in HUVECs. Incubation of HUVECs with CTRP9 rescued ox-LDL-induced endothelial injury. CTRP9 treatment reversed ox-LDL-evoked decreases in antioxidant enzymes including heme oxygenase-1 (HO-1), nicotinamide adenine dinucleotide phosphate (NAD(P)H) dehydrogenase quinone 1, and glutamate-cysteine ligase (GCL), as well as endothelial nitric oxide synthase (eNOS). Furthermore, CTRP9 induced activation of peroxisome proliferator-activated receptor γ co-activator 1α (PGC1-α) and phosphorylation of adenosine monophosphate-activated protein kinase (AMPK). Of interest, AMPK inhibition or PGC1-α silencing abolished CTRP9-mediated antioxidant enzymes levels, eNOS expressions, and endothelial protective effects. Collectively, we provided the first evidence that CTRP9 attenuated ox-LDL-induced endothelial injury by antioxidant enzyme inductions dependent on PGC-1α/AMPK activation. View Full-Text
Keywords: endothelial dysfunction; ox-LDL; AMPK; PGC1-α; CTRP9 endothelial dysfunction; ox-LDL; AMPK; PGC1-α; CTRP9
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    Description: C1q/TNF-related protein-9 ameliorates ox-LDL-induced endothelial dysfunction via PGC-1α/AMPK-mediated antioxidant enzyme induction
MDPI and ACS Style

Sun, H.; Zhu, X.; Zhou, Y.; Cai, W.; Qiu, L. C1q/TNF-Related Protein-9 Ameliorates Ox-LDL-Induced Endothelial Dysfunction via PGC-1α/AMPK-Mediated Antioxidant Enzyme Induction. Int. J. Mol. Sci. 2017, 18, 1097.

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