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Black tea protects against hypertension-associated endothelial dysfunction through alleviation of endoplasmic reticulum stress
Cheang W.S.1; Ngai C.Y.1; Tam Y.Y.1; Tian X.Y.3; Wong W.T.3; Zhang Y.1; Lau C.W.1; Chen Z.Y.1; Bian Z.-X.2; Huang Y.1; Leung F.P.2
2015-05-15
Source PublicationScientific Reports
ISSN20452322
Volume5
Abstract

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 (TF). 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 TF. 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.

DOI10.1038/srep10340
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000355249600001
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Cited Times [WOS]:35   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionInstitute of Chinese Medical Sciences
Affiliation1.Chinese University of Hong Kong
2.Hong Kong Baptist University
3.Methodist Hospital Houston
Recommended Citation
GB/T 7714
Cheang W.S.,Ngai C.Y.,Tam Y.Y.,et al. Black tea protects against hypertension-associated endothelial dysfunction through alleviation of endoplasmic reticulum stress[J]. Scientific Reports,2015,5.
APA 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..(2015).Black tea protects against hypertension-associated endothelial dysfunction through alleviation of endoplasmic reticulum stress.Scientific Reports,5.
MLA Cheang W.S.,et al."Black tea protects against hypertension-associated endothelial dysfunction through alleviation of endoplasmic reticulum stress".Scientific Reports 5(2015).
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