Black tea protects against hypertension-associated endothelial dysfunction through alleviation of endoplasmic reticulum stress
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摘要Hypertensive patients have been found to be associated with elevated levels of homocysteine, known as hyperhomocysteinemia. Homocysteine (Hcy) can induce endoplasmic reticulum (ER) stress in endothelial cells. This study aims to investigate whether black tea (BT) protects against hypertension-associated endothelial dysfunction through alleviation of ER stress. Rat aortae and cultured rat aortic endothelial cells were treated with Hcy, BT extract, and theaflavin-3,3′-digallate (TF3). Male Sprague Dawley rats were infused with angiotensin II (Ang II) to induce hypertension and orally administrated with BT extract at 15â €‰mg/kg/day for 2 weeks. Hcy impaired endothelium-dependent relaxations of rat aortae and led to ER stress in endothelial cells, which were ameliorated by co-incubation of BT extract and TF3. The blood pressure of Ang II-infused rats and plasma Hcy level were normalized by BT consumption. Impaired endothelium-dependent relaxations in renal arteries, carotid arteries and aortae, and flow-mediated dilatations in third-order mesenteric resistance arteries were improved. Elevations of ER stress markers and ROS level, plus down-regulation of Hcy metabolic enzymes in aortae from Ang II-infused rats were prevented by BT treatment. Our data reveal the novel cardiovascular benefits of BT in ameliorating vascular dysfunctions, providing insight into developing BT into beneficial dietary supplements in hypertensive patients.
著者Cheang W.S., Ngai C.Y., Tam Y.Y., Tian X.Y., Wong W.T., Zhang Y., Lau C.W., Chen Z.Y., Bian Z.-X., Huang Y., Leung F.P.
期刊名稱Scientific Reports
出版年份2015
月份5
日期15
卷號5
出版社Nature Publishing Group
出版地United Kingdom
國際標準期刊號2045-2322
電子國際標準期刊號2045-2322
語言英式英語

上次更新時間 2020-16-10 於 03:18