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https://www.readbyqxmd.com/read/28079202/oligomer-formation-of-a-tea-polyphenol-egcg-on-its-sensing-molecule-67-kda-laminin-receptor
#1
Yuhui Huang, Mami Sumida, Motofumi Kumazoe, Kaori Sugihara, Yumi Suemasu, Shuhei Yamada, Shuya Yamashita, Jyunichi Miyakawa, Takashi Takahashi, Hiroshi Tanaka, Yoshinori Fujimura, Hirofumi Tachibana
Green tea polyphenol (-)-epigallocatechin-3-O-gallate (EGCG) has been attributed to the activation of its cell surface sensing receptor 67 kDa laminin receptor (67LR). However, the action of EGCG to activate 67LR remains unknown. Here we show that EGCG undergoes oligomer formation on its surface receptor 67LR.
January 12, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28077264/self-assembly-of-green-tea-catechin-derivatives-in-nanoparticles-for-oral-lycopene-delivery
#2
Weikun Li, Murat Yalcin, Qishan Lin, Mohammed-Salleh M Ardawi, Shaker A Mousa
Lycopene is a natural anti-oxidant that has attracted much attention due to its varied applications such as protection against loss of bone mass, chronic diseases, skin cancer, prostate cancer, and cardiovascular disease. However, high instability and extremely low oral bioavailability limits its further clinical development. We selected a green tea catechin derivative, oligomerized (-)-epigallocatechin-3-O-gallate (OEGCG) as a carrier for oral lycopene delivery. Lycopene-loaded OEGCG nanoparticles (NPs) were prepared by a nano-precipitation method, followed by coating with chitosan to form a shell...
January 7, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28076319/impact-of-nutrition-on-pollutant-toxicity-an-update-with-new-insights-into-epigenetic-regulation
#3
Jessie B Hoffman, Michael C Petriello, Bernhard Hennig
Exposure to environmental pollutants is a global health problem and is associated with the development of many chronic diseases, including cardiovascular disease, diabetes and metabolic syndrome. There is a growing body of evidence that nutrition can both positively and negatively modulate the toxic effects of pollutant exposure. Diets high in proinflammatory fats, such as linoleic acid, can exacerbate pollutant toxicity, whereas diets rich in bioactive and anti-inflammatory food components, including omega-3 fatty acids and polyphenols, can attenuate toxicant-associated inflammation...
January 11, 2017: Reviews on Environmental Health
https://www.readbyqxmd.com/read/28071811/extraction-of-epigallocatechin-gallate-and-epicatechin-gallate-from-tea-leaves-using-%C3%AE-cyclodextrin
#4
Lu Cui, Yuxuan Liu, Ting Liu, Yahong Yuan, Tianli Yue, Rui Cai, Zhouli Wang
Use of organic solvents to extract phenolic compounds from plants may result in environmental pollution and cause health problems in persons. Replacing organic extraction solvents by green extracting agents without affecting the extraction yield is one of the most pressing problems to be solved. The aim of this study is to evaluate the capacity of β-cyclodextrin (β-CD) to recover phenolic compounds from tea leaves. The extract obtained using the ethanol/water mixture presented the highest total phenolic content, followed by those obtained using β-CD solution and water...
January 10, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28071792/thermal-stability-improvement-of-rice-bran-albumin-protein-incorporated-with-epigallocatechin-gallate
#5
Zhongkai Zhou, Jingjing Xu, Yuqian Liu, Demei Meng, Xiaoli Sun, Hong Yi, Yunjing Gao, Guoyu Sun, Padraig Strappe, Chris Blanchard, Rui Yang
Rice bran albumin protein (RAP) is sensitive to thermal changes and tends to degrade when exposed to high-temperature processing. In this work, RAP-epigallocatechin-3-gallate (EGCG) complex (RAPE) was prepared and the thermal stability was evaluated. Fluorescence results showed that EGCG could interact with RAP with a binding number n of 0.0885:1 (EGCG:RAP, w/w) and a binding constant K of 1.02 (± 0.002) ×10(4) /M, suggesting both hydrogen bonding and van der Waals forces played an important role. FTIR analysis demonstrated that EGCG could induce secondary structural changes in RAP above a ratio of 1...
January 10, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28071787/interaction-of-whey-proteins-with-phenolic-derivatives-under-neutral-and-acidic-ph-conditions
#6
Yanyun Cao, Youling L Xiong
Integration of gallic acid (GA) and its derivative epigallocatechin gallate (EGCG; 20, 120, and 240 μmol/g, protein basis) into whey protein isolate (WPI) at room temperature and pH 3.0 and pH 7.0 was investigated. At pH 7.0, both phenolics caused significant structural changes and EGCG induced greater digestibility of WPI. Total sulfhydryl in WPI decreased from 28.6 to 7.6 μmol/g and surface hydrophobicity declined by nearly 50% with 240 μmol/g EGCG at pH 7.0. Similar but less appreciable changes were produced by GA and at pH 3...
January 10, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28060832/better-management-of-alcohol-liver-disease-using-a-microstructured-synbox-system-comprising-l-plantarum-and-egcg
#7
Praveen Rishi, Sumeha Arora, Ujjwal Jit Kaur, Kanwaljit Chopra, Indu Pal Kaur
Synergistic combination of probiotics with carbohydrate based prebiotics is widely employed for the treatment of various gut related disorders. However, such carbohydrate based prebiotics encourage the growth of pathogens and probiotics, equally. Aim of the study was (i) to explore the possibility of using epigallocatechin gallate (EGCG) a phenolic compound, as a prebiotic for L.plantarum; (ii) to develop and evaluate a microstructured synbox (microencapsulating both probiotic and EGCG together) in rat model of alcohol liver disease (ALD); and, (iii) to confirm whether the combination can address issues of EGCG bioavailability and probiotic survivability in adverse gut conditions...
2017: PloS One
https://www.readbyqxmd.com/read/28059601/metabolic-interactions-between-cysteamine-and-epigallocatechin-gallate
#8
Valentina Izzo, Federico Pietrocola, Valentina Sica, Sylvère Durand, Sylvie Lachkar, David Enot, José Manuel Bravo-San Pedro, Alexis Chery, Speranza Esposito, Valeria Raia, Luigi Maiuri, Maria Chiara Maiuri, Guido Kroemer
Phase II clinical trials indicate that the combination of cysteamine plus epigallocatechin gallate (EGCG) is effective against cystic fibrosis in patients bearing the most frequent etiological mutation (CFTRΔF508). Here, we investigated the interaction between both agents on cultured respiratory epithelia cells from normal and CFTRΔF508-mutated donors. We observed that the combination of both agents affected metabolic circuits (and in particular the tricarboxylic acid cycle) in a unique way and that cysteamine plus EGCG reduced cytoplasmic protein acetylation more than each of the two components alone...
January 6, 2017: Cell Cycle
https://www.readbyqxmd.com/read/28058738/epigallocatechin-3-gallate-egcg-and-green-tea-polyphenols-do-not-improve-stallion-semen-parameters-during-cooling-at-4%C3%A2-c
#9
D Bucci, M Spinaci, B Mislei, B Gadani, G Rizzato, C C Love, C Tamanini, G Galeati, G Mari
Stallion semen storage for artificial insemination is mainly based on liquid cooled storage. In many stallions this technique maintains sperm quality for an extended period of time (24-72 hr) at 7°C. While this technique is commonly used in the horse industry, there can be a decline in fertility in some stallions, due to an inability of their sperm to tolerate the cool storage process. The aim of the present work was to evaluate the effect of two natural antioxidants (epigallocatechin-3-gallate (EGCG) at 20, 60 and 120 μm and green tea polyphenols, and p at ...
January 6, 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/28056735/effect-of-green-tea-phytochemicals-on-mood-and-cognition
#10
Christina Dietz, Matthijs Dekker
BACKGROUND: Green tea is traditionally known to induce mental clarity, cognitive function, physical activation and relaxation. Recently, a special green tea, matcha tea, is rapidly gaining popularity throughout the world and is frequently referred to as a mood- and brain food. Matcha tea consumption leads to much higher intake of green tea phytochemicals compared to regular green tea. Previous research on tea constituents caffeine, L-theanine, and epigallocatechin gallate (EGCG) repeatedly demonstrated benefits on mood and cognitive performance...
January 5, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28056603/epigallocatechin-3-gallate-attenuates-acrylamide-induced-apoptosis-and-astrogliosis-in-rat-cerebral-cortex
#11
Yin He, Dehong Tan, Bing Bai, Zhaoxia Wu, Shujuan Ji
The potent neurotoxic agent acrylamide (ACR) is formed during Maillard reaction in food processing. Epigallocatechin-3-gallate (EGCG), a major bioactive component of green tea, is an antioxidant, but its effects on ACR-induced neurotoxicity are unclear. Here, we investigated the neuroprotective effects of EGCG against ACR-induced apoptosis and astrogliosis in the cerebral cortex. Rats were pretreated with EGCG for 4 d and then co-administered ACR for 14 d. Immunohistochemical analysis of glial fibrillary acidic protein and 8-hydroxy-2'-deoxyguanosine indicated that EGCG attenuated astrogliosis and DNA damage in ACR treated rats...
January 5, 2017: Toxicology Mechanisms and Methods
https://www.readbyqxmd.com/read/28054010/data-for-%C3%AE-lactoglobulin-conformational-analysis-after-epigallocatechin-gallate-and-metal-ions-binding
#12
Liangliang Zhang, Indra Dev Sahu, Man Xu, Yongmei Wang, Xinyu Hu
This data article contains complementary results related to the paper "Effect of metal ions on the binding reaction of (-)-epigallocatechin gallate to β-lactoglobulin" (Zhang et al., 2017) [1]. Data was obtained by circular dichroism (CD) spectroscopy to investigate potential β-lactoglobulin (β-Lg) conformational changes with different concentrations of EGCg and Cu(2+) or Al(3+) added to β-Lg. 500 µL of the 25 µM β-Lg solution containing EGCg (25 µM) or metal ions (0-500 µM) were measured, and the spectra were recorded...
February 2017: Data in Brief
https://www.readbyqxmd.com/read/28053547/anticancer-activities-of-epigallocatechin-3-gallate-against-cholangiocarcinoma-cells
#13
Tae Won Kwak, Su Bum Park, Hyun-Jung Kim, Young-Il Jeong, Dae Hwan Kang
PURPOSE: Epigallocatechin-3-gallate (EGCG) is an antioxidant agent derived from green tea. Because it has chemopreventive and anti-invasive effect against various cancer cells, EGCG can be used to inhibit proliferation and invasion of cholangiocarcinoma (CCA) cells. METHODS: The anticancer effects of EGCG were studied using human CCA cells (HuCC-T1). Apoptosis was analyzed by Western blotting. Invasion and migration of cancer cells were assessed with Matrigel(®) and wound healing assays...
2017: OncoTargets and Therapy
https://www.readbyqxmd.com/read/28053292/randomized-placebo-controlled-trial-evaluating-the-safety-of-one-year-administration-of-green-tea-catechins
#14
Nagi B Kumar, Julio Pow-Sang, Philippe E Spiess, Jong Park, Raoul Salup, Christopher R Williams, Howard Parnes, Michael J Schell
PURPOSE: Although preclinical, epidemiological and prior clinical trial data suggest that green tea catechins (GTCs) may reduce prostate cancer (PCa) risk, several preclinical studies and case reports have reported liver toxicities and acute gastrointestinal bleeding. Based on these observations, regulatory bodies have required stringent inclusion criteria with frequent, excessive toxicity monitoring and early stopping rules in clinical trials. These requirements have impeded recruitment and retention of subjects in chemoprevention trials and subsequent progress in agent development efforts...
October 25, 2016: Oncotarget
https://www.readbyqxmd.com/read/28051030/epigallocatechin-3-gallate-modulates-microrna-expression-profiles-in-human-nasopharyngeal-carcinoma-cne2-cells
#15
Bin-Bin Li, Guo-Liang Huang, Hua-Hui Li, Xia Kong, Zhi-Wei He
BACKGROUND: Epigallocatechin-3-gallate (EGCG) has exhibited antitumor properties in several types of cancers, including nasopharyngeal carcinoma (NPC), but the molecular mechanisms underlying this function remain incompletely understood. The aim of the present study was to characterize the global impact of EGCG on the expression of microRNAs (miRNAs) in NPC cells. METHODS: Using microarray analysis, the alterations of miRNA expression profiles were investigated in EGCG-treated CNE2 cells...
2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28049293/small-angle-x-ray-scattering-study-of-protein-complexes-with-tea-polyphenols
#16
Ce Shi, Haifeng Tang, Jie Xiao, Fengchao Cui, Kecheng Yang, Ji Li, Qin Zhao, Qingrong Huang, Yunqi Li
Exploration of the structure of protein complexes, especially the change in conformation and aggregation behavior of proteins upon ligand binding, is crucial to clarify their bioactivities at the molecular level. We applied solution small-angle X-ray scattering (SAXS) to study the complex structure of bovine serum albumin (BSA) and trypsin binding with tea polyphenols, that is, catechin and epigallocatechin gallate (EGCG). We found that tea polyphenols can steadily promote the aggregation of proteins and protein complexes through their bridging effect...
January 11, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28049055/synergistic-effects-of-negatively-charged-hydrophobic-nanoparticles-and-epigallocatechin-3-gallate-on-inhibiting-amyloid-%C3%AE-protein-aggregation
#17
Hongchen Liu, Linling Yu, Xiaoyan Dong, Yan Sun
Fibrillogenesis of amyloid β-protein (Aβ) in human brain has been implicated as the main cause of Alzheimer's disease. A few small molecules from natural sources have been discovered for their inhibition effects on Aβ fibrillation, of which (-)-epigallocatechin-3-gallate (EGCG) is one of the most broadly investigated compounds for its potent inhibitory activity. However, in vivo applicability of the inhibitors is largely limited by their low transmembrane efficiency. Hence, it is of great significance to develop inhibition systems that function at low concentrations...
December 19, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28042007/epigallocatechin-3-gallate-promotes-angiogenesis-via-up-regulation-of-nfr2-signaling-pathway-in-a-mouse-model-of-ischemic-stroke
#18
Qian Bai, Zhipai Lyu, Zhenjie Pan, Jiyu Lou, Tieli Dong
Epigallocatechin-3-gallate (EGCG) is the major effective component of green tea and has been known as a potential anticancer drug because of its antioxidant and anti-angiogenic properties. EGCG has also been reported to have preventive effects against ischemic stroke via nuclear factor erythroid 2-related factor 2 (Nfr2) signaling pathway, but how EGCG affect angiogenesis after stroke remains unclear. In this study, we investigated whether EGCG treatment in the acute phase of ischemic stroke can promote angiogenesis in a mouse model of transient middle cerebral artery occlusion (MCAO)...
December 29, 2016: Behavioural Brain Research
https://www.readbyqxmd.com/read/28040599/green-tea-epigallocatechin-3-gallate-alleviates-hyperglycemia-and-reduces-advanced-glycation-end-products-via-nrf2-pathway-in-mice-with-high-fat-diet-induced-obesity
#19
Chethan Sampath, Muhammed Raihan Rashid, Shengmin Sang, Mohamed Ahmedna
Epigallocatechin 3-gallate (EGCG) from green tea may reduce plasma glucose and alleviate complications of diabetes by attenuating advanced glycation end products (AGEs) formation. We hypothesized that EGCG would mitigate AGEs formation via activating the nuclear factor erythroid-2-related-factor-2 (Nrf2) pathway in a mouse model of high fat diet-induced obesity. Dietary EGCG was tested in C57BL/6 mice that were placed on a high-fat diet with or without ECGC for 17 weeks and compared to a control group placed on low-fat diet for the same period...
December 29, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28040581/egcg-inhibited-bladder-cancer-sw780-cell-proliferation-and-migration-both-in-vitro-and-in-vivo-via-down-regulation-of-nf-%C3%AE%C2%BAb-and-mmp-9
#20
Ke-Wang Luo, Wei Chen, Wing-Yin Lung, Xia-Yun Wei, Bao-Hui Cheng, Zhi-Ming Cai, Wei-Ren Huang
Epigallocatechin-3-gallate (EGCG), the bioactive polyphenol in green tea, has been demonstrated to have various biological activities. Our study aims to investigate the antiproliferation and antimigration effects of EGCG against bladder cancer SW780 cells both in vitro and in vivo. Our results showed that treatment of EGCG resulted in significant inhibition of cell proliferation by induction of apoptosis, without obvious toxicity to normal bladder epithelium SV-HUC-1 cells. EGCG also inhibited SW780 cell migration and invasion at 25-100 μM...
December 20, 2016: Journal of Nutritional Biochemistry
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