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Aging and Disease    2018, Vol. 9 Issue (2) : 322-330     DOI: 10.14336/AD.2017.0523
Short Communication |
Age-Dependent Decrease in Adropin is Associated with Reduced Levels of Endothelial Nitric Oxide Synthase and Increased Oxidative Stress in the Rat Brain
Changjun Yang,Kelly M. DeMars,Eduardo Candelario-Jalil
Department of Neuroscience, McKnight Brain Institute, University of Florida, Gainesville, FL, USA
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Abstract  

Adropin is a peptide highly expressed in the brain. Emerging evidence indicates that low plasma levels of adropin are closely associated with aging and endothelial dysfunction. We hypothesized that aging reduces adropin levels in the brain, which correlates with reduced endothelial nitric oxide synthase (eNOS) and increased oxidative stress associated with age-related endothelial dysfunction. Cortical brain tissue and plasma were collected from young (10-12 weeks old) and aged (18-20 months old) male Sprague-Dawley naïve rats. Using RT-qPCR, we quantified the mRNA levels of the energy homeostasis associated (Enho) gene encoding for adropin. Western blotting was utilized to measure adropin and markers of endothelial dysfunction and oxidative stress in the brain tissue. Levels of adropin in plasma were measured using an ELISA kit. Compared to young rats, both Enho mRNA and protein levels were dramatically reduced in the aged rat brain, which was accompanied by a significant reduction in plasma adropin levels in aged compared to young rats. Additionally, total and phosphorylated levels of endothelial nitric oxide synthase (eNOS) were significantly decreased in aged rat brains and were associated with dramatically increased gp91phox-containing NADPH oxidase (a major source of free radicals) and 4-hydroxynonenal (4-HNE), a lipid peroxidation marker. Brain levels of Akt and caveolin-1 were significantly reduced in aged rats compared with young animals. Collectively, these findings indicate that adropin levels negatively correlate with markers of endothelial dysfunction and oxidative injury, which raises the possibility that loss of brain adropin might play a role in the pathogenesis and development of aging-associated cerebrovascular dysfunction.

Keywords adropin      aging      endothelial nitric oxide synthase      gp91phox      4-hydroxynonenal     
Corresponding Authors: Eduardo Candelario-Jalil   
Issue Date: 01 April 2018
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Changjun Yang
Kelly M. DeMars
Eduardo Candelario-Jalil
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Changjun Yang,Kelly M. DeMars,Eduardo Candelario-Jalil. Age-Dependent Decrease in Adropin is Associated with Reduced Levels of Endothelial Nitric Oxide Synthase and Increased Oxidative Stress in the Rat Brain[J]. A&D, 2018, 9(2): 322-330.
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http://www.aginganddisease.org/EN/10.14336/AD.2017.0523     OR     http://www.aginganddisease.org/EN/Y2018/V9/I2/322
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