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Epigallocatechin gallate

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https://www.readbyqxmd.com/read/29165314/towards-natural-mimetics-of-metformin-and-rapamycin
#1
Alexander Aliper, Leslie Jellen, Franco Cortese, Artem Artemov, Darla Karpinsky-Semper, Alexey Moskalev, Andrew G Swick, Alex Zhavoronkov
Aging is now at the forefront of major challenges faced globally, creating an immediate need for safe, widescale interventions to reduce the burden of chronic disease and extend human healthspan. Metformin and rapamycin are two FDA-approved mTOR inhibitors proposed for this purpose, exhibiting significant anti-cancer and anti-aging properties beyond their current clinical applications. However, each faces issues with approval for off-label, prophylactic use due to adverse effects. Here, we initiate an effort to identify nutraceuticals-safer, naturally-occurring compounds-that mimic the anti-aging effects of metformin and rapamycin without adverse effects...
November 15, 2017: Aging
https://www.readbyqxmd.com/read/29165090/inhibition-of-adipogenesis-by-thiourea-derivatives
#2
Hina Siddiqui, Sarah Shafi, Farah Mukhtar, Asma Ejaz, Atta-Ur-Rahman, M Iqbal Choudhary
BACKGROUND: Obesity is one of the major health problem with inherent risk of type 2 diabetes, hypertension, CVDs etc. Adipogenesis is a major contributor in the process of obesity. Inhibition of adipocytes is one of the key approach to treat obesity. OBJECTIVE: To discover the new inhibitors of adipogenesis as the treatment for the obesity. METHOD: We describe here the synthesis and anti-adipogenic activity of thiourea derivatives 1-14. These derivatives were synthesized by the reactions of phenyl and pentafluorophenyl isothiocyanate with different aromatic amines...
November 20, 2017: Medicinal Chemistry
https://www.readbyqxmd.com/read/29163766/epigallocatechin-3-gallate-egcg-up-regulates-mir-15b-expression-thus-attenuating-store-operated-calcium-entry-soce-into-murine-cd4-t-cells-and-human-leukaemic-t-cell-lymphoblasts
#3
Shaqiu Zhang, Tamer Al-Maghout, Rosi Bissinger, Ni Zeng, Lisann Pelzl, Madhuri S Salker, Anchun Cheng, Yogesh Singh, Florian Lang
CD4(+) T cells are key elements in immune responses and inflammation. Activation of T cell receptors in CD4(+) T cells triggers cytosolic Ca(2+) release with subsequent store operated Ca(2+) entry (SOCE), which is accomplished by the pore forming Ca(2+) release activated Ca(2+) (CRAC) channel Orai1 and its regulator stromal cell-interaction molecule 2 (STIM2). Green tea polyphenol epigallocatechin-3-gallate (EGCG) acts as a potent anti-inflammatory and anti-oxidant agent for various types of cells including immune cells...
October 27, 2017: Oncotarget
https://www.readbyqxmd.com/read/29161690/catechins-blunt-the-effects-of-oxldl-and-its-primary-metabolite-phosphatidylcholine-hydroperoxide-on-endothelial-dysfunction-through-inhibition-of-oxidative-stress-and-restoration-of-enos-in-rats
#4
Hao-Hsiang Chang, Chen-Yen Chien, Kuo-Hsin Chen, Shih-Chung Huang, Chiang-Ting Chien
BACKGROUND/AIMS: We explored the effects of catechins (decaffeinated green tea extracts containing (-)-epicatechin, (-)-epigallocatechin, (-)-epicatechin gallate and (-)-epigallocatechin gallate) on atherosclerosis risk factors, oxidized low-density lipoprotein (oxLDL) and its primary metabolite, phosphatidylcholine hydroperoxide (PCOOH) induced oxidative injury in cultured endothelial cell line and rats. METHODS: We used endothelial cell line and male Wistar rats to determine the effect of catechins on oxLDL or PCOOH induced oxidative injury including apoptosis, H2O2 level, vascular responses and urinary 8-isoprostane and nitrite/nitrate concentration...
November 22, 2017: Kidney & Blood Pressure Research
https://www.readbyqxmd.com/read/29160895/differential-expression-of-micrornas-contributed-to-the-health-efficacy-of-egcg-in-in-vitro-subarachnoid-hemorrhage-model
#5
Ying Chen, Liyong Huang, Lei Wang, Lingyun Chen, Wenhua Ren, Wenke Zhou
(-)-Epigallocatechin-3-gallate (EGCG) exhibits a broader spectrum health efficacy in subarachnoid hemorrhage (SAH) therapy; the mechanisms, however, are largely unknown. Given that miRNAs play important roles in regulation of thousands of gene expressions, the effect of EGCG on the expression of miRNAs was investigated to explore the multi-targeting actions of EGCG by using an in vitro SAH model. MTT and western blot assays were used to assess the health effects of EGCG in SAH progression; the results showed that oxyhemoglobin (OxyHb)-induced cell proliferation and excessive autophagic activation were significantly inhibited by 50 μM EGCG, but not by 1 μM EGCG...
November 21, 2017: Food & Function
https://www.readbyqxmd.com/read/29157815/an-efflux-pump-mexab-oprm-of-pseudomonas-aeruginosa-is-associated-with-antibacterial-activity-of-epigallocatechin-3-gallate-egcg
#6
Rashmi Kanagaratnam, Rida Sheikh, Fahad Alharbi, Dong H Kwon
BACKGROUND: Pseudomonas aeruginosa is a notorious multidrug resistant nosocomial pathogen. An efflux pump (MexAB-OprM) is the main contributor to the multidrug resistance in clinical isolates of P. aeruginosa. Epigallocatechin-3-gallate (EGCG), a polyphenolic compound extracted from green tea, exhibits antibacterial activity. It is unclear that molecular details of the antibacterial activity of EGCG, EGCG-effect on antibiotic susceptibility, and clinical relevance of EGCG in bacteria...
December 1, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/29157036/epigallocatechin-3-o-gallate-alleviates-the-malignant-phenotype-in-a-431-epidermoid-and-sk-br-3-breast-cancer-cell-lines
#7
Alexandru Filippi, Tiphanie Picot, Carmen Mariana Aanei, Péter Nagy, János Szöllősi, Lydia Campos, Constanţa Ganea, Maria-Magdalena Mocanu
In this study, we evaluated the effects of epigallocatechin-3-O-gallate (EGCG) in two cancer cell lines, A-431 overexpressing ErbB1 and SK-BR-3, overexpressing ErbB2. EGCG treatment showed dose-dependent collapse of mitochondrial membrane potential (Δψm), increase in reactive oxygen species (ROS) production, changes in nuclear morphology and reduced viability. Flow cytometry data indicated that EGCG partially decreases the phosphorylation of several proteins involved in cell proliferation and survival: pErbB1(Y1173, Y1068), pAkt(S473) and pERK(Y204)...
November 21, 2017: International Journal of Food Sciences and Nutrition
https://www.readbyqxmd.com/read/29146347/effect-of-tea-products-on-the-in-vitro-enzymatic-digestibility-of-starch
#8
Haihua Zhang, Yulan Jiang, Junxian Pan, Yangjun Lv, Jun Liu, Shikang Zhang, Yuejin Zhu
The importance of postprandial hyperglycemia in the treatment of diabetes has been recognized recently. Tea products, such as tea polyphenols (TP), epigallocatechin gallate (EGCG), matcha, and instant tea, were chosen as constituents of tea-flour food, aimed at regulating the release of glucose from starchy foods in the postprandial period. Six starches were chosen for internal composition analysis and hydrolysis studies in vitro. Corn starch, wheat starch, and lily root flour appeared to have higher resistant starch content, slower digestion profiles, and lower kinetic constants, implying sustained release of glucose in the gastrointestinal tract...
March 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29137307/reversal-of-5-fluorouracil-resistance-by-egcg-is-mediate-by-inactivation-of-tfap2a-vegf-signaling-pathway-and-down-regulation-of-mdr-1-and-p-gp-expression-in-gastric-cancer
#9
Hongsheng Tang, Lisi Zeng, Jiahong Wang, Xiangliang Zhang, Qiang Ruan, Jin Wang, Shuzhong Cui, Dinghua Yang
The effect of 5-fluorouracil (5-FU) chemotherapy for gastric cancer (GC) is limited by drug-resistance. To conquer this drug-resistance, various treatments including combination therapy have been used, but the overall survival has not been improved yet. In our current study, 5-FU resistant GC cells, SGC7901/FU and MGC803/FU, were established by long term exposure to 5-FU, and the proliferation capability of these resistant cells was verified to be reduced. The drug related proteins, MDR1 and P-gp were up-regulated in resistant cells compared to the parental cells...
October 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/29136554/separation-and-purification-of-four-phenolic-compounds-from-persimmon-by-high-speed-counter-current-chromatography
#10
Jinming Peng, Kaikai Li, Wei Zhu, Xiangyi Deng, Chunmei Li
An efficient method was established by high-speed counter-current chromatography (HSCCC) for preparation of four phenolic compounds from the depolymerization products of persimmon tannin. Using the two solvent systems of n-hexane/ethyl acetate/water (3:17:20, v/v/v) and ethyl acetate/methanol/water (50:1:50, v/v/v), the preparative isolation was successfully performed by a two-step separation. The yields of one run (150mg crude sample) for gallic acid, methyl gallate, and epigallocatechin-3-gallate-(4β→8, 2β→O→7)-epigallocatechin-3-gallate dimer (A-type EGCG dimer) were 4...
November 7, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29131612/functional-characterization-of-epitheaflagallin-3-o-gallate-generated-in-laccase-treated-green-tea-extracts-in-the-presence-of-gallic-acid
#11
Nobuya Itoh, Junji Kurokawa, Yasuhiro Isogai, Masaru Ogasawara, Takayuki Matsunaga, Tutomu Okubo, Yuji Katsube
Epitheaflagallin (ETFG) and epitheaflagallin 3-O-gallate (ETFGg) are minor polyphenols in black tea extract that are enzymatically synthesized from epigallocatechin (EGC) and epigallocatechin gallate (EGCg), respectively, in green tea extract via laccase oxidation in the presence of gallic acid. The constituents of laccase-treated green tea extract in the presence of gallic acid are thus quite different from those of non-laccase-treated green tea extract: EGC and EGCg are present in lower concentrations, and ETFG and ETFGg are present in higher concentrations...
November 13, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29129901/the-inhibitory-effects-of-anthocyanin-rich-sunrouge-tea-on-pancreatic-lipase-activity
#12
Nobuya Shirai
This study investigated the in vitro and in vivo effects of Sunrouge (SR), which is an anthocyaninrich green tea. Hot and cold water extracts (CWEX) of Yabukita (YK; regular green tea), SR second crop (SR2), and SR third crop (SR3) were prepared. The 50% inhibitory concentrations for YK, SR2, and SR3 CWEXs against pancreatic lipase in vitro were 12.3±2.8, 6.2±0.3, and 4.0±1.1 mg/mL, respectively. Epigallocatechin gallate (EGCG) accounted for 4.3%, 6.0%, and 6.3% of YK, SR2, and SR3 CWEXs, respectively. SR2 had the highest anthocyanin content of these three samples...
November 13, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/29127880/effects-of-flavonoids-on-microrna-145-regulation-through-klf4-and-myocardin-in-neointimal-formation-in-vitro-and-in-vivo
#13
Chiu-Mei Lin, Bao-Wei Wang, Chun-Ming Pan, Wei-Jen Fang, Su-Kiat Chua, Sheng-Wen Hou, Hang Chang, Kou-Gi Shyu
MicroRNA 145 (miR-145) is a critical modulator of vascular smooth muscle cell (VSMC) phenotyping and proliferation. Flavonoids have been studied extensively due to their diverse pharmacological properties, including anti-inflammatory effects. The aims of this study is designed to evaluate the atheroprotective effects on angiotensin II (Ang II)-induced miR-145 and Klf4/myocardin expression in vitro and in vivo of flavonoids, including (-)-epigallocatechin gallate (EGCG), chrysin, wogonin, silibinin, and ferulic acid...
September 14, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/29122665/in-vitro-screening-of-dual-flavonoid-combinations-for-reversing-p-glycoprotein-mediated-multidrug-resistance-focus-on-antiepileptic-drugs
#14
Ana Ferreira, Adriana O Santos, Amílcar Falcão, Gilberto Alves
The combined use of different P-glycoprotein (P-gp) inhibitors may be a relevant approach to the synergistic and safer inhibition of the P-gp-mediated drug efflux. Herein, we aimed to explore dual combinations of the flavonoids baicalein, (-)-epigallocatechin gallate, kaempferol, quercetin and silymarin to reverse the interference of P-gp on the intracellular accumulation of antiepileptic drugs (AEDs). The intracellular accumulation of rhodamine 123 (a classic P-gp substrate) and of several commonly used AEDs (carbamazepine, phenytoin, oxcarbazepine) or their metabolites (carbamazepine-10,11-epoxide and licarbazepine) was evaluated in MDCK-MDR1 cells in the presence and absence of individual flavonoids and their combinations...
November 6, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29120370/amorphous-solid-dispersion-of-epigallocatechin-gallate-for-enhanced-physical-stability-and-controlled-release
#15
Yizheng Cao, Jing Teng, Jon Selbo
Epigallocatechin gallate (EGCG) has been recognized as the most prominent green tea extract due to its healthy influences. The high instability and low bioavailability, however, strongly limit its utilization in food and drug industries. This work, for the first time, develops amorphous solid dispersion of EGCG to enhance its bioavailability and physical stability. Four commonly used polymeric excipients are found to be compatible with EGCG in water-dioxane mixtures via a stepwise mixing method aided by vigorous mechanical interference...
November 9, 2017: Pharmaceuticals
https://www.readbyqxmd.com/read/29119790/green-tea-polyphenols-decrease-strecker-aldehydes-and-bind-to-proteins-in-lactose-hydrolyzed-uht-milk
#16
Therese Jansson, Valentin Rauh, Bente P Danielsen, Mahesha M Poojary, Sandra S Waehrens, Wender L P Bredie, John Sørensen, Mikael A Petersen, Colin A Ray, Marianne N Lund
The effect of epigallocatechin gallate enriched green tea extract (GTE) on flavor, Maillard reactions and protein modifications in lactose-hydrolyzed (LH) ultrahigh temperature (UHT) processed milk was examined during storage at 40 °C for up to 42 days. Addition of GTE inhibited the formation of Strecker aldehydes by up to 95% compared to control milk, and the effect was similar when GTE was added either before or after UHT treatment. Release of free amino acids, caused by proteolysis, during storage was also decreased in GTE-added milk either before or after UHT treatment compared to control milk...
November 17, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29117537/antioxidant-effects-of-epigallocatechin-3-gallate-on-the-atc1-6-pancreatic-alpha-cell-line
#17
Ting Cao, Xiong Zhang, Dan Yang, Yue-Qian Wang, Zheng-Dong Qiao, Jian-Ming Huang, Peng Zhang
Hypoglycemia is a major barrier to achieving stable metabolic control in patients with diabetes which is a serious clinical concern. With progression of diabetes, the ability of pancreatic α-cells which respond to hypoglycemia becomes impaired; However, it is not clear whether the dysfunctional responses of α-cells during hypoglycemia are related with oxidative stress. In the present study, we investigated whether epigallocatechin-3-gallate (EGCG) has antioxidant potential on pancreatic alpha TC1-6 (αTC1-6) cell lines and protect the normal function of α-cells from H2O2 induced oxidative stress...
November 5, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29115797/polyphenol-epigallocatechin-3-gallate-inhibits-hypoxia-reoxygenation-induced-h9c2-cell-apoptosis
#18
Wenlong Wang, Xiaohui Huang, Deliang Shen, Zonghua Ming, Mei Zheng, Jinying Zhang
BACKGROUND: We aimed to observe the protective effect of EGCG on hypoxia/reoxygenation injury of H9C2 myocardial cells and to study the inhibition mechanism of EGCG on hypoxia/reoxygenation injury of H9C2 myocardial cells. METHODS: H9C2 cells were used as the objects of study and hypoxia/reoxygenation cells were pretreated with EGCG in different concentrations. MTT, Hoechst 33258 and LDH were used to detect the viability and apoptosis of H9C2 cells. The protection mechanism of polyphenol epigallocatechin-3-gallate was studied via western blotting and mitochondrial membrane potential detection...
November 7, 2017: Minerva Medica
https://www.readbyqxmd.com/read/29113871/oxidative-stress-and-dietary-phytochemicals-role-in-cancer-chemoprevention-and-treatment
#19
Shireen Chikara, Lokesh Dalasanur Nagaprashantha, Jyotsana Singhal, David Horne, Sanjay Awasthi, Sharad S Singhal
Several epidemiological observations have shown an inverse relation between consumption of plant-based foods, rich in phytochemicals, and incidence of cancer. Phytochemicals, secondary plant metabolites, via their antioxidant property play a key role in cancer chemoprevention by suppressing oxidative stress-induced DNA damage. In addition, they modulate several oxidative stress-mediated signaling pathways through their anti-oxidant effects, and ultimately protect cells from undergoing molecular changes that trigger carcinogenesis...
November 4, 2017: Cancer Letters
https://www.readbyqxmd.com/read/29113283/epigallocatechin-3-gallate-induces-apoptosis-in-acute-promyelocytic-leukemia-cells-via-a-shp-1-p38%C3%AE-mapk-bax-cascade
#20
Liugen Gan, Liang Zhong, Zhiling Shan, Chunlan Xiao, Ting Xu, Hao Song, Liu Li, Rong Yang, Beizhong Liu
Acute promyelocytic leukemia (APL) is characterized by a specific chromosomal translation, resulting in a fusion gene that affects the differentiation, proliferation and apoptosis of APL cells. Epigallocatechin-3-gallate (EGCG), a catechin, exhibits numerous biological functions, including antitumor activities. Previous studies have reported that EGCG induces apoptosis in NB4 cells. However, the molecular mechanism underlying EGCG-induced apoptosis remains unclear. The present study aimed to determine the molecular basis of EGCG-induced apoptosis in NB4 cells...
November 2017: Oncology Letters
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