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Green tea and cancer

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https://www.readbyqxmd.com/read/29024813/a-prodrug-of-green-tea-polyphenol-epigallocatechin-3-gallate-pro-egcg-serves-as-a-novel-angiogenesis-inhibitor-in-endometrial-cancer
#1
Jianzhang Wang, Gene Chi Wai Man, Tak Hang Chan, Joseph Kwong, Chi Chiu Wang
Anti-angiogenesis effect of a prodrug of green tea polyphenol (-)-epigallocatechin-3-gallate (Pro-EGCG) in malignant tumors is not well studied. Here, we investigated how the treatment with Pro-EGCG inhibited tumor angiogenesis in endometrial cancer. Tumor xenografts of human endometrial cancer were established and subjected to microarray analysis after Pro-EGCG treatment. First, we showed Pro-EGCG inhibited tumor angiogenesis in xenograft models through down-regulation of vascular endothelial growth factor A (VEGFA) and hypoxia inducible factor 1 alpha (HIF1α) in tumor cells and chemokine (C-X-C motif) ligand 12 (CXCL12) in host stroma by immunohistochemical staining...
October 9, 2017: Cancer Letters
https://www.readbyqxmd.com/read/28980522/association-between-green-tea-intake-and-risk-of-gastric-cancer-a-systematic-review-and-dose-response-meta-analysis-of-observational-studies
#2
Yanhong Huang, Hongru Chen, Liang Zhou, Gaoming Li, Dali Yi, Yanqi Zhang, Yazhou Wu, Xiaoyu Liu, Xiaojiao Wu, Qiuyue Song, Ling Liu, Dong Yi
OBJECTIVE: To examine and quantify the potential dose-response relationship between green tea intake and the risk of gastric cancer. DESIGN: We searched PubMed, EMBASE, Web of Science, CBM, CNKI and VIP up to December 2015 without language restrictions. SETTING: A systematic review and dose-response meta-analysis of observational studies. SUBJECTS: Five cohort studies and eight case-control studies. RESULTS: Compared with the lowest level of green tea intake, the pooled relative risk (95 % CI) of gastric cancer was 1·05 (0·90, 1·21, I 2=20·3 %) for the cohort studies and the pooled OR (95 % CI) was 0·84 (0·74, 0·95, I 2=48·3 %) for the case-control studies...
October 5, 2017: Public Health Nutrition
https://www.readbyqxmd.com/read/28977833/unique-synergistic-formulation-of-curcumin-epicatechin-gallate-and-resveratrol-tricurin-suppresses-hpv-e6-eliminates-hpv-cancer-cells-and-inhibits-tumor-progression
#3
Sumit Mukherjee, Priya Ranjan Debata, Rahman Hussaini, Kaushiki Chatterjee, Juliet N E Baidoo, Samay Sampat, Anita Szerszen, Joseph P Navarra, Jimmie Fata, Elena Severinova, Probal Banerjee, Mario R Castellanos
Curcumin (from curry) (C) is highly potent against cervical cancer cells (CCC), but poor bioavailability has limited its clinical use. Similar natural polyphenols resveratrol (from grapes) (R), and epicatechin gallate (from green tea) (E) also display activity against CCC. By treating CCC (HeLa) with C, E, or R, or combinations of these compounds, we computed combination indices and observed a strong synergism among C, E, and R at the unique molar ratio 4:1:12.5. This combination, named as TriCurin, rapidly down regulated HPV18 E6 and NF-kB expression while concomitantly inducing the tumor suppressor protein p53 in HeLa cells...
September 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/28969404/effect-of-green-tea-catechins-in-patients-with-high-grade-prostatic-intraepithelial-neoplasia-results-of-a-short-term-double-blind-placebo-controlled-phase-ii-clinical-trial
#4
Salvatore Micali, Angelo Territo, Giacomo Maria Pirola, Nancy Ferrari, Maria Chiara Sighinolfi, Eugenio Martorana, Michele Navarra, Giampaolo Bianchi
BACKGROUND AND STUDY OBJECTIVE: Several studies suggest a protective role of green tea catechins against prostate cancer (PCa). In order to evaluate the efficacy of green tea catechins for chemoprevention of PCa in patients with high-grade prostate intraepithelial neoplasia (HG-PIN) we performed a phase II clinical trial. METHODS: Sixty volunteers with HG-PIN were enrolled to carry out a double-blind randomized placebo-controlled phase II clinical trial. Treated group took daily 600 mg of green tea catechins (Categ Plus®) for 1 year...
October 3, 2017: Archivio Italiano di Urologia, Andrologia
https://www.readbyqxmd.com/read/28964574/epigallocatechin-3-gallate-promotes-apoptosis-and-reversal-of-multidrug-resistance-in-esophageal-cancer-cells
#5
Liang Liu, Yingchao Ju, Jing Wang, Rongmiao Zhou
Evidence for demonstrating the role of the green tea component epigallocatechin-3-gallate (EGCG) in esophageal squamous cell carcinoma cells is limited. In this study, we investigated apoptosis induced by EGCG and the underlying molecular mechanisms in human esophageal squamous cell carcinoma cells. The growth-inhibitory effects of EGCG on esophageal cancer cell (Eca109 and Ec9706) were detected by MTT. Using flow cytometry, we determined the cellular apoptosis, bcl-2, bax and caspase-3 protein expression in Eca109 and Ec9706 cells following treatment with EGCG for 24h...
September 12, 2017: Pathology, Research and Practice
https://www.readbyqxmd.com/read/28961534/hyaluronic-acid-green-tea-catechin-micellar-nanocomplexes-fail-safe-cisplatin-nanomedicine-for-the-treatment-of-ovarian-cancer-without-off-target-toxicity
#6
Ki Hyun Bae, Susi Tan, Atsushi Yamashita, Wei Xia Ang, Shu Jun Gao, Shu Wang, Joo Eun Chung, Motoichi Kurisawa
The green tea catechin, (-)-epigallocatechin-3-O-gallate (EGCG), has gained significant attention as a potent adjuvant to enhance the antitumor efficacy of cisplatin while mitigating its harmful side effects. Herein we report the development of a fail-safe cisplatin nanomedicine constructed with hyaluronic acid-EGCG conjugate for ovarian cancer therapy. A simple mixing of this conjugate and cisplatin induces spontaneous self-assembly of micellar nanocomplexes having a spherical core-shell structure. The surface-exposed hyaluronic acid enables efficient delivery of cisplatin into CD44-overexpressing cancer cells via receptor-mediated endocytosis whereas the internally packed EGCG moieties offer an environment favorable for the encapsulation of cisplatin...
December 2017: Biomaterials
https://www.readbyqxmd.com/read/28961399/active-antioxidizing-particles-for-on-demand-pressure-driven-molecular-release
#7
Yongbeom Seo, Jiayu Leong, Jye Yng Teo, Jennifer W Mitchell, Martha U Gillette, Bumsoo Han, Jonghwi Lee, Hyunjoon Kong
Overproduced reactive oxygen species (ROS) are closely related to various health problems including inflammation, infection, and cancer. The abnormally high ROS level can cause serious oxidative damage to biomolecules, cells, and, tissues. A series of nano- or micro-sized particles has been developed to reduce the oxidative stress level by delivering antioxidant drugs. However, most systems are often plagued by the slow molecular discharge driven by diffusion. Herein, this study demonstrates the polymeric particles whose internal pressure can increase upon exposure to H2O2, one of the ROS, and, in turn, discharge antioxidants actively...
September 29, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28947951/tricurin-a-novel-formulation-of-curcumin-epicatechin-gallate-and-resveratrol-inhibits-the-tumorigenicity-of-human-papillomavirus-positive-head-and-neck-squamous-cell-carcinoma
#8
Longzhu Piao, Sumit Mukherjee, Qing Chang, Xiujie Xie, Hong Li, Mario R Castellanos, Probal Banerjee, Hassan Iqbal, Ryan Ivancic, Xueqian Wang, Theodoros N Teknos, Quintin Pan
Head and neck squamous cell carcinoma (HNSCC) is the sixth most prevalent cancer worldwide with about 600,000 new cases diagnosed in the last year. The incidence of human papillomavirus-positive head and neck squamous cell carcinoma (HPV-positive HNSCC) has rapidly increased over the past 30 years prompting the suggestion that an epidemic may be on the horizon. Therefore, there is a clinical need to develop alternate therapeutic strategies to manage the growing number of HPV-positive HNSCC patients. TriCurin is a composition of three food-derived polyphenols in unique stoichiometric proportions consisting of curcumin from the spice turmeric, resveratrol from red grapes, and epicatechin gallate from green tea...
September 1, 2017: Oncotarget
https://www.readbyqxmd.com/read/28943954/epigallocatechin-3-gallate-suppresses-cell-proliferation-and-promotes-apoptosis-in-ec9706-and-eca109-esophageal-carcinoma-cells
#9
Liang Liu, Jing Zuo, Guangda Wang
Epigallocatechin-3-gallate (EGCG) is a component of green tea with anticancer effects that have been demonstrated in multiple types of cancer, but few reports exist concerning its effect in esophageal squamous cell carcinoma cells. The present study investigated apoptosis induced by EGCG treatment and the underlying molecular mechanisms in Eca109 and Ec9706 human esophageal squamous cell carcinoma cells. The apoptosis rate following treatment with various concentration of EGCG for 24 h was detected by flow cytometry...
October 2017: Oncology Letters
https://www.readbyqxmd.com/read/28942499/human-cancer-stem-cells-are-a-target-for-cancer-prevention-using-epigallocatechin-gallate
#10
REVIEW
Hirota Fujiki, Eisaburo Sueoka, Anchalee Rawangkan, Masami Suganuma
PURPOSE: Our previous experiments show that the main constituent of green-tea catechins, (-)-epigallocatechin gallate (EGCG), completely prevents tumor promotion on mouse skin initiated with 7,12-dimethylbenz(a)anthracene followed by okadaic acid and that EGCG and green tea extract prevent cancer development in a wide range of target organs in rodents. Therefore, we focused our attention on human cancer stem cells (CSCs) as targets of cancer prevention and treatment with EGCG. METHODS: The numerous reports concerning anticancer activity of EGCG against human CSCs enriched from cancer cell lines were gathered from a search of PubMed, and we hope our review of the literatures will provide a broad selection for the effects of EGCG on various human CSCs...
September 23, 2017: Journal of Cancer Research and Clinical Oncology
https://www.readbyqxmd.com/read/28933413/the-role-of-the-nrf2-are-antioxidant-system-in-preventing-cardiovascular-diseases
#11
REVIEW
Robert E Smith, Kevin Tran, Cynthia C Smith, Miranda McDonald, Pushkar Shejwalkar, Kenji Hara
It is widely believed that consuming foods and beverages that have high concentrations of antioxidants can prevent cardiovascular diseases and many types of cancer. As a result, many articles have been published that give the total antioxidant capacities of foods in vitro. However, many antioxidants behave quite differently in vivo. Some of them, such as resveratrol (in red wine) and epigallocatechin gallate or EGCG (in green tea) can activate the nuclear erythroid-2 like factor-2 (Nrf2) transcription factor...
November 11, 2016: Diseases (Basel)
https://www.readbyqxmd.com/read/28919675/therapeutic-uses-of-epicatechin-in-diabetes-and-cancer
#12
REVIEW
Layth Abdulmajeed Abdulkhaleq, Mohammed Abdulrazzaq Assi, Mohd Hezmee Mohd Noor, Rasedee Abdullah, Mohd Zamri Saad, Yun Hin Taufiq-Yap
Epicatechin is a natural flavonoid found in green tea. It has been reported to possess an immense antioxidant effect which contributes to its therapeutic effect against a handful of ailments. In this review, we discuss its therapeutic role in the management of two of the most important human diseases; diabetes and cancer. The consumption of epicatechin has been shown to reduce blood glucose levels in diabetic patients, while is anticancer effect was attributed to its antioxidant properties, antiangiogenic and direct cytotoxicity to cancer cells...
August 2017: Veterinary World
https://www.readbyqxmd.com/read/28904061/a-randomized-controlled-trial-of-green-tea-extract-supplementation-and-mammographic-density-in-postmenopausal-women-at-increased-risk-of-breast-cancer
#13
Hamed Samavat, Giske Ursin, Tim H Emory, Eunjung Lee, Renwei Wang, Carolyn J Torkelson, Allison M Dostal, Karen Swenson, Chap T Le, Chung S Yang, Mimi C Yu, Douglas Yee, Anna H Wu, Jian-Min Yuan, Mindy S Kurzer
Epidemiological and animal studies suggest a protective role of green tea against breast cancer. However the underlying mechanism is not understood. We conducted a randomized, double-blinded, placebo-controlled phase II clinical trial to investigate whether supplementation with green tea extract (GTE) modifies mammographic density (MD), as a potential mechanism, involving 1,075 healthy postmenopausal women. Women assigned to the treatment arm consumed daily 4 decaffeinated GTE capsules containing 1315 mg total catechins including 843 mg epigallocatechin-3-gallate (EGCG) for 12 months...
September 13, 2017: Cancer Prevention Research
https://www.readbyqxmd.com/read/28884125/green-tea-extracts-epigallocatechin-3-gallate-for-different-treatments
#14
REVIEW
Chenyu Chu, Jia Deng, Yi Man, Yili Qu
Epigallocatechin-3-gallate (EGCG), a component extracted from green tea, has been proved to have multiple effects on human pathological and physiological processes, and its mechanisms are discrepant in cancer, vascularity, bone regeneration, and nervous system. Although there are multiple benefits associated with EGCG, more and more challenges are still needed to get through. For example, EGCG shows low bioactivity via oral administration. This review focuses on effects of EGCG, including anti-cancer, antioxidant, anti-inflammatory, anticollagenase, and antifibrosis effects, to express the potential of EGCG and necessity of further studies in this field...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28882342/the-analysis-of-aroma-flavor-compounds-in-green-tea-using-ice-concentration-linked-with-extractive-stirrer
#15
Abdullah H Alluhayb, Brian A Logue
Worldwide, green tea is one of the most popular beverages. It promotes blood circulation, liver function, and lowers the risk of cancer and cardiovascular diseases. This drink is characterized by the distinctive odors and flavors produced by its constituent compounds, with its value predicated on the amount and type of constituents extracted from the tea leaves during brewing. Ice concentration linked with extractive stirrer (ICECLES) is a novel sample preparation technique, especially applicable for the extraction of relatively polar compounds while retaining excellent extraction efficiencies for non-polar compounds...
August 25, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28845765/role-of-green-tea-flavonoids-and-other-related-contents-in-cancer-prevention
#16
REVIEW
Muhammad Imran Qadir
Green tea is made from Camellia sinensis and leaves through the oxidation process. It mainly originates in China and has been used traditionally throughout Asia. In the West, black tea has been used mostly, but green tea has become the most popular beverage throughout the world. It is also used as a raw material in cosmetics, health foods, and as an added ingredient in various beverages. Different varieties of green tea are available. The main differences between the varieties are due to harvesting time, production procedures, and horticulture...
2017: Critical Reviews in Eukaryotic Gene Expression
https://www.readbyqxmd.com/read/28843267/screening-for-circulating-tumour-cells-allows-early-detection-of-cancer-and-monitoring-of-treatment-effectiveness-an-observational-study
#17
Karin Ried, Peter Eng, Avni Sali
Background: Circulating-Tumour-Cells (CTC) provide a blood biomarker for early carcinogenesis, cancer progression and treatment effectiveness. An increase in CTCs is associated with cancer progression, a CTC decrease with cancer containment or remission. Several technologies have been developed to identify CTC, including the validated Isolation-by-Size-of-Epithelial-Tumour (ISET, Rarecells) technology, combining blood filtration and microscopy using standard histo-pathological criteria. Methods: This observational study compared CTC count to cancer status and cancer risk, by monitoring treatment effectiveness in cancer patients and by screening for CTC in asymptomatic patients with risk factors, including family history of cancer...
August 27, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28839265/combinatorial-bioactive-botanicals-re-sensitize-tamoxifen-treatment-in-er-negative-breast-cancer-via-epigenetic-reactivation-of-er%C3%AE-expression
#18
Yuanyuan Li, Syed M Meeran, Trygve O Tollefsbol
Conventional cancer prevention has primarily focused on single chemopreventive compounds that may not be sufficiently efficacious. We sought to investigate potential combinatorial effects of epigenetic bioactive botanicals including epigallocatechin-3-gallate (EGCG) in green tea polyphenols (GTPs) and sulforaphane (SFN) in broccoli sprouts (BSp) on neutralizing epigenetic aberrations in estrogen receptor-α (ERα) leading to enhanced anti-hormone therapeutic efficacy in ERα-negative breast cancer. Our results showed that this combinatorial treatment re-sensitized ERα-dependent cellular inhibitory responses to an estrogen antagonist, tamoxifen (TAM), via at least in part, epigenetic reactivation of ERα expression in ERα-negative breast cancer cells...
August 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28765341/coffee-and-green-tea-consumption-and-subsequent-risk-of-malignant-lymphoma-and-multiple-myeloma-in-japan-the-japan-public-health-center-based-prospective-study
#19
Tomotaka Ugai, Keitaro Matsuo, Norie Sawada, Motoki Iwasaki, Taiki Yamaji, Taichi Shimazu, Shizuka Sasazuki, Manami Inoue, Yoshinobu Kanda, Shoichiro Tsugane
Background: The aim of this study was to investigate the association of coffee and green tea consumption and the risk of malignant lymphoma and multiple myeloma in a large-scale population-based cohort study in Japan.Methods: In this analysis, a total of 95,807 Japanese subjects (45,937 men and 49,870 women; ages 40-69 years at baseline) of the Japan Public Health Center-based Prospective Study who completed a questionnaire about their coffee and green tea consumption were followed up until December 31, 2012, for an average of 18 years...
August 2017: Cancer Epidemiology, Biomarkers & Prevention
https://www.readbyqxmd.com/read/28765194/effect-of-green-tea-supplements-on-liver-enzyme-elevation-results-from-a-randomized-intervention-study-in-the-united-states
#20
Zheming Yu, Hamed Samavat, Allison M Dostal, Renwei Wang, Carolyn J Torkelson, Chung S Yang, Lesley M Butler, Thomas W Kensler, Anna H Wu, Mindy S Kurzer, Jian-Min Yuan
Liver injury effects of green tea-based products have been reported in sporadic case reports. However, no study has examined systematically such adverse effects in an unbiased manner. We examined the potential effects of a high, sustained oral dose of green tea extract (GTE) on liver injury measures in a randomized, placebo-controlled, double-blinded phase II clinical trial, which enrolled 1,075 women with the original aim to assess the effect of daily GTE consumption for 12 months on biomarkers of breast cancer risk...
August 1, 2017: Cancer Prevention Research
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