Evidence map›Paper›PMID 25976123›Full record

ArticleScientific reports2015

Black tea protects against hypertension-associated endothelial dysfunction through alleviation of endoplasmic reticulum stress.

Wai San Cheang, Ching Yuen Ngai, Ye Yen Tam, Xiao Yu Tian, Wing Tak Wong, Yang Zhang, Chi Wai Lau, Zhen Yu Chen, Zhao-Xiang Bian, Yu Huang and 1 more

Open access · goldAbstract read
In one paragraph

Article in Scientific reports, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 29 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
29citing papers in PubMed, 2 pooled it
7.2field-weighted citation impact, top 3% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

29 citing papers in PubMed, 2 syntheses or guidelines pooled it, 69 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
  3. Trial
  4. Enhanced Effects of Complex Tea Extract and the Postbiotic BPL1International journal of molecular sciences · 2026
    Article
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  16. Plants Used as Antihypertensive.Natural products and bioprospecting · 2021
    Review
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

11 authors at 3 institutions in 3 countries.

Wai San CheangInstitute of Vascular Medicine and Li Ka Shing Institute of Health Sciences, Chinese University of Hong Kong, Hong Kong, China.
Ching Yuen NgaiInstitute of Vascular Medicine and Li Ka Shing Institute of Health Sciences, Chinese University of Hong Kong, Hong Kong, China.
Ye Yen TamInstitute of Vascular Medicine and Li Ka Shing Institute of Health Sciences, Chinese University of Hong Kong, Hong Kong, China.
Xiao Yu TianDepartment of Cardiovascular Sciences, Methodist Research Institute, Houston, TX, USA.
Wing Tak WongDepartment of Cardiovascular Sciences, Methodist Research Institute, Houston, TX, USA.
Yang ZhangInstitute of Vascular Medicine and Li Ka Shing Institute of Health Sciences, Chinese University of Hong Kong, Hong Kong, China.
Chi Wai LauInstitute of Vascular Medicine and Li Ka Shing Institute of Health Sciences, Chinese University of Hong Kong, Hong Kong, China.
Zhen Yu ChenSchool of Life Sciences, Chinese University of Hong Kong, Hong Kong, China.
Zhao-Xiang BianClinical Division, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China.
Yu HuangInstitute of Vascular Medicine and Li Ka Shing Institute of Health Sciences, Chinese University of Hong Kong, Hong Kong, China.
Fung Ping LeungClinical Division, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China.
Chinese University of Hong Kong · CNHong Kong Baptist University · HKHouston Methodist · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

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 (TF3). Male Sprague Dawley rats were infused with angiotensin II (Ang II) to induce hypertension and orally administrated with BT extract at 15 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.

Indexed as

Angiotensin IIAnimalsAortaBiflavonoidsBlood PressureCamellia sinensisCapillary ResistanceCatechinCells, CulturedEndoplasmic Reticulum StressEndothelial CellsEndothelium, VascularHomocysteineHyperhomocysteinemiaHypertensionMaleAngiotensin IIBiflavonoidsCatechinHomocysteinePlant ExtractsReactive Oxygen SpeciesTeatheaflavin-3,3'-digallate

Identifiers

PMID25976123
PMCPMC4432571
OpenAlexW1579420785

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.