Mediation of the in vitro cytotoxicity of green and black tea polyphenols by cobalt chloride

2005 ◽  
Vol 155 (1) ◽  
pp. 195-205 ◽  
Author(s):  
H. Babich ◽  
T. Gold ◽  
R. Gold
Keyword(s):  
Cobalt Chloride ◽  
Black Tea ◽  
In Vitro Cytotoxicity ◽  
Tea Polyphenols ◽  
Black Tea Polyphenols ◽  
Green And Black Tea

Microarray reveals positive effects of green and black tea polyphenols on TNF[alpha]-induced changes of gene expression

2013 ◽  
Author(s):  
Husna Zulkipli ◽  
Norita Salim ◽  
Gabriele Anisah Froemming ◽  
Aletza Mohd Ismail ◽  
Hapizah Nawawi
Keyword(s):  
Gene Expression ◽  
Black Tea ◽  
Tea Polyphenols ◽  
Tnf Alpha ◽  
Positive Effects ◽  
Black Tea Polyphenols ◽  
Green And Black Tea ◽  
Induced Changes

Biosorption of green and black tea polyphenols into Saccharomyces cerevisiae improves their bioaccessibility

2015 ◽  
Vol 17 ◽  
pp. 11-21 ◽  
Author(s):  
Hanène Jilani ◽  
Antonio Cilla ◽  
Reyes Barberá ◽  
Moktar Hamdi
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Black Tea ◽  
Tea Polyphenols ◽  
Black Tea Polyphenols ◽  
Green And Black Tea

scholarly journals Vasodilation of Tea Polyphenols Ex Vivo Is Mediated by Hydrogen Peroxide under Rapid Compound Decay

Antioxidants ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 390
Author(s):  
Mario Lorenz ◽  
Stephanie Lehmann ◽  
Ilija Djordjevic ◽  
Thomas Düsterhöft ◽  
Benno F. Zimmermann ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Ex Vivo ◽  
Health Effect ◽  
Black Tea ◽  
Tea Polyphenols ◽  
Time Range ◽  
Tea Polyphenol ◽  
Apparent Lack ◽  
Green And Black Tea

Improvement of endothelial function represents a major health effect of tea in humans. Ex vivo, tea and tea polyphenols stimulate nitric oxide (NO)-dependent vasodilation in isolated blood vessels. However, it was reported that polyphenols can generate reactive oxygen species (ROS) in vitro. We therefore aimed to elucidate the role of ROS production in tea polyphenol-induced vasodilation in explanted aortic rings. Vasorelaxation of rat aortic rings was assessed in an organ chamber model with low concentrations of epigallocatechin-3-gallate (EGCG), theaflavin-3,3’-digallate (TF3), and with green and black tea, with or without pretreatment with catalase or superoxide dismutase (SOD). The stability of EGCG and TF3 was measured by HPLC, and the levels of hydrogen peroxide (H2O2) were determined. EGCG and green tea-induced vasorelaxation was completely prevented by catalase and slightly increased by SOD. TF3 and black tea yielded similar results. Both EGCG and TF3 were rapidly degraded. This was associated with increasing H2O2 levels over time. Hydrogen peroxide concentrations produced in a time range compatible with tea polyphenol decay induced NO-dependent vasodilation in aortic rings. In conclusion, tea polyphenol-induced vasodilation in vitro is mediated by low levels of H2O2 generated during compound decay. The results could explain the apparent lack of vasodilatory effects of isolated tea polyphenols in humans.

Intrinsic apoptosis and NF-κB signaling are potential molecular targets for chemoprevention by black tea polyphenols in HepG2 cells in vitro and in a rat hepatocarcinogenesis model in vivo

2010 ◽  
Vol 48 (11) ◽  
pp. 3281-3287 ◽  
Author(s):  
R. Senthil Murugan ◽  
R. Vidya Priyadarsini ◽  
K. Ramalingam ◽  
Y. Hara ◽  
D. Karunagaran ◽  
...  
Keyword(s):  
Hepg2 Cells ◽  
Molecular Targets ◽  
Black Tea ◽  
Tea Polyphenols ◽  
Intrinsic Apoptosis ◽  
Black Tea Polyphenols

Prevention of diet-induced obesity by dietary black tea polyphenols extract in vitro and in vivo

Nutrition ◽  
2011 ◽  
Vol 27 (3) ◽  
pp. 287-292 ◽  
Author(s):  
Satoshi Uchiyama ◽  
Yoshimasa Taniguchi ◽  
Akiko Saka ◽  
Aruto Yoshida ◽  
Hiroaki Yajima
Keyword(s):  
Black Tea ◽  
Tea Polyphenols ◽  
Diet Induced Obesity ◽  
Black Tea Polyphenols
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