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Journal Article
Research Support, Non-U.S. Gov't
From the Cover: Zinc Deficiency Worsens and Supplementation Prevents High-Fat Diet Induced Vascular Inflammation, Oxidative Stress, and Pathological Remodeling.
Obesity has become a common public health problem in the world and raises the risk of various cardiovascular diseases. Zinc is essential for multiple organs in terms of normal structure and function. The present study investigated the effects of high fat diet (HFD) induced obesity on the aorta in mice, and evaluated whether it can be affected by zinc deficiency or supplementation. Four-week-old male C57BL/6J mice were fed HFD with varied amounts of zinc (deficiency, adequate and supplementation) for 3 and 6 months. Results showed that HFD feeding induced a time-dependent aortic remodeling, demonstrated by increased vessel wall thickness, tunica cell proliferation and fibrotic responses, and inflammatory response, reflected by increased expression of inflammatory cytokines (tumor necrosis factor-α and vascular cell adhesion molecule 1). HFD feeding also caused aortic oxidative damage, reflected by 3-nitrotyrosine and 4-hydroxy-2-nonenal accumulation, and down-regulated nuclear factor (erythroid-derived 2)-like 2 (Nrf2) expression and function, shown by down-regulation of its downstream antioxidants, catalase, NAD(P)H dehydrogenase (quinone 1), and metallothionein expression. The vascular effects of obesity-induced by HFD was exacerbated by zinc deficiency but significantly improved by zinc supplementation. In addition, down-regulation of Nrf2 function and associated antioxidants expression were also worsened by zinc deficiency but improved by zinc supplementation. These results suggest that HFD induces aortic remodeling, which can be exacerbated by zinc deficiency and improved by zinc supplementation.
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