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Green tea and cancer

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https://www.readbyqxmd.com/read/27887958/bottom-up-synthesis-of-carbon-nanoparticles-with-higher-doxorubicin-efficacy
#1
Samer Bayda, Mohamad Hadla, Stefano Palazzolo, Vinit Kumar, Isabella Caligiuri, Emmanuele Ambrosi, Enrico Pontoglio, Marco Agostini, Tiziano Tuccinardi, Alvise Benedetti, Pietro Riello, Vincenzo Canzonieri, Giuseppe Corona, Giuseppe Toffoli, Flavio Rizzolio
Nanomedicine requires intelligent and non-toxic nanomaterials for real clinical applications. Carbon materials possess interesting properties but with some limitations due to toxic effects. Interest in carbon nanoparticles (CNPs) is increasing because they are considered green materials with tunable optical properties, overcoming the problem of toxicity associated with quantum dots or nanocrystals, and can be utilized as smart drug delivery systems. Using black tea as a raw material, we synthesized CNPs with a narrow size distribution, tunable optical properties covering visible to deep red absorption, non-toxicity and easy synthesis for large-scale production...
November 22, 2016: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/27886147/emerging-phytochemicals-for-the-prevention-and-treatment-of-head-and-neck-cancer
#2
REVIEW
Santosh K Katiyar
Despite the development of more advanced medical therapies, cancer management remains a problem. Head and neck squamous cell carcinoma (HNSCC) is a particularly challenging malignancy and requires more effective treatment strategies and a reduction in the debilitating morbidities associated with the therapies. Phytochemicals have long been used in ancient systems of medicine, and non-toxic phytochemicals are being considered as new options for the effective management of cancer. Here, we discuss the growth inhibitory and anti-cell migratory actions of proanthocyanidins from grape seeds (GSPs), polyphenols in green tea and honokiol, derived from the Magnolia species...
November 24, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27879653/ellagic-acid-inhibits-bladder-cancer-invasiveness-and-in-vivo-tumor-growth
#3
Claudia Ceci, Lucio Tentori, Maria Grazia Atzori, Pedro M Lacal, Elena Bonanno, Manuel Scimeca, Rosella Cicconi, Maurizio Mattei, Maria Gabriella de Martino, Giuseppe Vespasiani, Roberto Miano, Grazia Graziani
Ellagic acid (EA) is a polyphenolic compound that can be found as a naturally occurring hydrolysis product of ellagitannins in pomegranates, berries, grapes, green tea and nuts. Previous studies have reported the antitumor properties of EA mainly using in vitro models. No data are available about EA influence on bladder cancer cell invasion of the extracellular matrix triggered by vascular endothelial growth factor-A (VEGF-A), an angiogenic factor associated with disease progression and recurrence, and tumor growth in vivo...
November 22, 2016: Nutrients
https://www.readbyqxmd.com/read/27869750/biophysical-approach-to-mechanisms-of-cancer-prevention-and-treatment-with-green-tea-catechins
#4
REVIEW
Masami Suganuma, Atsushi Takahashi, Tatsuro Watanabe, Keisuke Iida, Takahisa Matsuzaki, Hiroshi Y Yoshikawa, Hirota Fujiki
Green tea catechin and green tea extract are now recognized as non-toxic cancer preventives for humans. We first review our brief historical development of green tea cancer prevention. Based on exciting evidence that green tea catechin, (-)-epigallocatechin gallate (EGCG) in drinking water inhibited lung metastasis of B16 melanoma cells, we and other researchers have studied the inhibitory mechanisms of metastasis with green tea catechins using biomechanical tools, atomic force microscopy (AFM) and microfluidic optical stretcher...
November 18, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27836540/wnt-%C3%AE-catenin-pathway-mediates-epigallocatechin-3-gallate-egcg-inhibition-of-lung-cancer-stem-cells
#5
Jianyun Zhu, Ye Jiang, Xue Yang, Shijia Wang, Chunfeng Xie, Xiaoting Li, Yuan Li, Yue Chen, Xiaoqian Wang, Yu Meng, Mingming Zhu, Rui Wu, Cong Huang, Xiao Ma, Shanshan Geng, Jieshu Wu, Caiyun Zhong
Cancer stem cells (CSCs) play essential role in the progression of many tumors. Wnt/β-catenin pathway is crucial in maintaining the stemness of CSCs. (-)-Epigallocatechin-3-gallate (EGCG), the major bioactive component in green tea, has been shown to possess anti-cancer activity. To date, the interventional effect of EGCG on lung CSCs has not been elucidated yet. In the present study, tumorsphere formation assay was used to enrich lung CSCs from A549 and H1299 cells. We revealed that Wnt/β-catenin pathway was activated in lung CSCs, and downregulation of β-catenin, abolished lung CSCs traits...
November 9, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27826992/the-val158met-polymorphism-in-comt-gene-and-cancer-risk-role-of-endogenous-and-exogenous-catechols
#6
Katrin Sak
Catechol-O-methyltransferase, COMT, is an important phase II enzyme catalyzing the transfer of a methyl-group from S-adenosylmethionine to a catechol-containing substrate molecule. A genetic variant Val158Met in the COMT gene leads to a several-fold decrease in the enzymatic activity giving rise to the accumulation of potentially carcinogenic endogenous catechol estrogens and their reactive intermediates and increasing thus the risk of tumorigenesis. However, numerous association studies between the COMT genotype and susceptibility to various malignancies have shown inconsistent and controversial findings indicating that additional gene-gene and gene-environment interactions might be crucial in modulating the physiological role of the COMT...
November 9, 2016: Drug Metabolism Reviews
https://www.readbyqxmd.com/read/27810483/tea-coffee-and-caffeinated-beverage-consumption-and-risk-of-epithelial-ovarian-cancers
#7
Andy C Y Leung, Linda S Cook, Kenneth Swenerton, Blake Gilks, Richard P Gallagher, Anthony Magliocco, Helen Steed, Martin Köbel, Jill Nation, Angela Brooks-Wilson, Nhu D Le
BACKGROUND: The risk for epithelial ovarian cancer associated with the consumption of caffeinated beverages (tea, coffee, and soft drinks) and green tea is inconclusive. However, few studies have investigated the type of caffeinated beverage or the type of tea. OBJECTIVE: We assessed consumption of tea (black/caffeinated tea and green tea separately), coffee, and caffeinated soft drinks, as well as level of consumption, and the risk for epithelial ovarian cancer and its histotypes...
December 2016: Cancer Epidemiology
https://www.readbyqxmd.com/read/27806972/effects-of-green-tea-catechin-extract-on-serum-lipids-in-postmenopausal-women-a-randomized-placebo-controlled-clinical-trial
#8
Hamed Samavat, April R Newman, Renwei Wang, Jian-Min Yuan, Anna H Wu, Mindy S Kurzer
BACKGROUND: Green tea has been suggested to improve cardiovascular disease risk factors, including circulating lipid variables. However, current evidence is predominantly based on small, short-term randomized controlled trials conducted in diverse populations. OBJECTIVE: The aim of this study was to examine the efficacy and impact of green tea extract (GTE) supplementation high in epigallocatechin gallate (EGCG) on blood lipids in healthy postmenopausal women. DESIGN: This was an ancillary study of a double-blind, randomized, placebo-controlled, parallel-arm trial investigating the effects of a GTE supplement containing 1315 mg catechins (843 mg EGCG) on biomarkers of breast cancer risk...
November 2, 2016: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/27796716/association-of-breast-cancer-risk-in-brca1-and-brca2-mutation-carriers-with-genetic-variants-showing-differential-allelic-expression-identification-of-a-modifier-of-breast-cancer-risk-at-locus-11q22-3
#9
Yosr Hamdi, Penny Soucy, Karoline B Kuchenbaeker, Tomi Pastinen, Arnaud Droit, Audrey Lemaçon, Julian Adlard, Kristiina Aittomäki, Irene L Andrulis, Adalgeir Arason, Norbert Arnold, Banu K Arun, Jacopo Azzollini, Anita Bane, Laure Barjhoux, Daniel Barrowdale, Javier Benitez, Pascaline Berthet, Marinus J Blok, Kristie Bobolis, Valérie Bonadona, Bernardo Bonanni, Angela R Bradbury, Carole Brewer, Bruno Buecher, Saundra S Buys, Maria A Caligo, Jocelyne Chiquette, Wendy K Chung, Kathleen B M Claes, Mary B Daly, Francesca Damiola, Rosemarie Davidson, Miguel De la Hoya, Kim De Leeneer, Orland Diez, Yuan Chun Ding, Riccardo Dolcetti, Susan M Domchek, Cecilia M Dorfling, Diana Eccles, Ros Eeles, Zakaria Einbeigi, Bent Ejlertsen, Christoph Engel, D Gareth Evans, Lidia Feliubadalo, Lenka Foretova, Florentia Fostira, William D Foulkes, George Fountzilas, Eitan Friedman, Debra Frost, Pamela Ganschow, Patricia A Ganz, Judy Garber, Simon A Gayther, Anne-Marie Gerdes, Gord Glendon, Andrew K Godwin, David E Goldgar, Mark H Greene, Jacek Gronwald, Eric Hahnen, Ute Hamann, Thomas V O Hansen, Steven Hart, John L Hays, Frans B L Hogervorst, Peter J Hulick, Evgeny N Imyanitov, Claudine Isaacs, Louise Izatt, Anna Jakubowska, Paul James, Ramunas Janavicius, Uffe Birk Jensen, Esther M John, Vijai Joseph, Walter Just, Katarzyna Kaczmarek, Beth Y Karlan, Carolien M Kets, Judy Kirk, Mieke Kriege, Yael Laitman, Maïté Laurent, Conxi Lazaro, Goska Leslie, Jenny Lester, Fabienne Lesueur, Annelie Liljegren, Niklas Loman, Jennifer T Loud, Siranoush Manoukian, Milena Mariani, Sylvie Mazoyer, Lesley McGuffog, Hanne E J Meijers-Heijboer, Alfons Meindl, Austin Miller, Marco Montagna, Anna Marie Mulligan, Katherine L Nathanson, Susan L Neuhausen, Heli Nevanlinna, Robert L Nussbaum, Edith Olah, Olufunmilayo I Olopade, Kai-Ren Ong, Jan C Oosterwijk, Ana Osorio, Laura Papi, Sue Kyung Park, Inge Sokilde Pedersen, Bernard Peissel, Pedro Perez Segura, Paolo Peterlongo, Catherine M Phelan, Paolo Radice, Johanna Rantala, Christine Rappaport-Fuerhauser, Gad Rennert, Andrea Richardson, Mark Robson, Gustavo C Rodriguez, Matti A Rookus, Rita Katharina Schmutzler, Nicolas Sevenet, Payal D Shah, Christian F Singer, Thomas P Slavin, Katie Snape, Johanna Sokolowska, Ida Marie Heeholm Sønderstrup, Melissa Southey, Amanda B Spurdle, Zsofia Stadler, Dominique Stoppa-Lyonnet, Grzegorz Sukiennicki, Christian Sutter, Yen Tan, Muy-Kheng Tea, Manuel R Teixeira, Alex Teulé, Soo-Hwang Teo, Mary Beth Terry, Mads Thomassen, Laima Tihomirova, Marc Tischkowitz, Silvia Tognazzo, Amanda Ewart Toland, Nadine Tung, Ans M W van den Ouweland, Rob B van der Luijt, Klaartje van Engelen, Elizabeth J van Rensburg, Raymonda Varon-Mateeva, Barbara Wappenschmidt, Juul T Wijnen, Timothy Rebbeck, Georgia Chenevix-Trench, Kenneth Offit, Fergus J Couch, Silje Nord, Douglas F Easton, Antonis C Antoniou, Jacques Simard
PURPOSE: Cis-acting regulatory SNPs resulting in differential allelic expression (DAE) may, in part, explain the underlying phenotypic variation associated with many complex diseases. To investigate whether common variants associated with DAE were involved in breast cancer susceptibility among BRCA1 and BRCA2 mutation carriers, a list of 175 genes was developed based of their involvement in cancer-related pathways. METHODS: Using data from a genome-wide map of SNPs associated with allelic expression, we assessed the association of ~320 SNPs located in the vicinity of these genes with breast and ovarian cancer risks in 15,252 BRCA1 and 8211 BRCA2 mutation carriers ascertained from 54 studies participating in the Consortium of Investigators of Modifiers of BRCA1/2...
October 28, 2016: Breast Cancer Research and Treatment
https://www.readbyqxmd.com/read/27771921/catechins-and-its-role-in-chronic-diseases
#10
Yohei Shirakami, Hiroyasu Sakai, Takahiro Kochi, Mitsuru Seishima, Masahito Shimizu
The mechanisms of action of polyphenols have attracted much attention. Catechins are generally known as tea polyphenols. Researchers have extensively investigated the molecular mechanisms of these substances, especially (-)-epigallocatechin gallate of green tea catechin, and have provided new insights in the prevention and therapy for chronic diseases. This chapter summarizes catechins and their effects on chronic diseases, including metabolic syndromes, cardiovascular diseases, neurodegenerative diseases, and cancer, focusing on the effects of green tea catechins...
2016: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/27765354/anti-cancer-effect-of-epigallocatechin-3-gallate-egcg-in-head-and-neck-cancer-through-repression-of-transactivation-and-enhanced-degradation-of-%C3%AE-catenin
#11
Yoo Seob Shin, Sung Un Kang, Ju Kyeong Park, Yang Eun Kim, Yeon Soo Kim, Seung Joon Baek, Seong-Ho Lee, Chul-Ho Kim
BACKGROUND AND PURPOSE: Aberrant expression of β-catenin is highly associated with progression of various cancers including head and neck cancer (HNC). Green tea is most commonly used beverage in the world and one of the more bioactive compounds is the antioxidant epigallocatechin gallate (EGCG). This study was performed to investigate the mechanism by which EGCG inhibits the growth of HNC, focusing on the modulation of the expression and activity of β-catenin. METHODS: In vitro effects of EGCG on the transcription, translation, or degradation of β-catenin were investigated...
November 15, 2016: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/27747873/antioxidants-from-black-and-green-tea-from-dietary-modulation-of-oxidative-stress-to-pharmacological-mechanisms
#12
REVIEW
Ilaria Peluso, Mauro Serafini
The consumption of tea (Camellia sinensis) has been correlated with a low incidence of chronic pathologies, such as cardiovascular disease and cancer, in which oxidative stress plays a critical role. Tea catechins and theaflavins are, respectively, the bioactive phytochemicals responsible for the antioxidant activity of green tea (GT) and black tea (BT). In addition to their redox properties, tea catechins and theaflavins could have also pharmacological activities, such as the ability to lower glucose, lipid and uric acid (UA) levels...
October 16, 2016: British Journal of Pharmacology
https://www.readbyqxmd.com/read/27714264/topical-treatment-of-green-tea-polyphenols-emulsified-in-carboxymethyl-cellulose-protects-against-acute-ultraviolet-light-b-induced-photodamage-in-hairless-mice
#13
Huaping Li, Na Jiang, Qing Liu, Aili Gao, Xin Zhou, Bihua Liang, Runxiang Li, Zhenjie Li, Huilan Zhu
Ultraviolet (UV) radiation causes skin injury and inflammation resulting in impaired immune response and increased risk of skin cancer. It has been shown that green tea polyphenols (GTPs) enhanced intracellular antioxidant defense and promoted the downregulation of proapoptotic genes, and they could be used to protect against the damage induced by UV irradiation. However, the high instability and poor bioavailability of GTPs impose restrictions on their potential pharmacological use. Here we show that carboxymethyl cellulose sodium (CMC-Na) had a stabilizing effect on GTPs under aqueous conditions and topical application of GTPs (emulsified in CMC-Na) had a strong photoprotective effect against acute UVB induced photodamage in uncovered (Uncv) hairless mice skin...
October 5, 2016: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/27706097/anti-inflammatory-effects-of-aspalathus-linearis-and-cyclopia-spp-extracts-in-a-uvb-keratinocyte-hacat-model-utilising-interleukin-1%C3%AE-accumulation-as-biomarker
#14
Tandeka Magcwebeba, Pieter Swart, Sonja Swanevelder, Elizabeth Joubert, Wentzel Gelderblom
Ultraviolet B (UVB) radiation is one of the major predisposing risk factors of skin cancer. The anticancer and photoprotective effects of unoxidized rooibos (Aspalathus linearis) and honeybush (Cyclopia) herbal teas, containing high levels of dihydrochalones and xanthones, respectively, have been demonstrated in skin cancer models in vivo. In the current study, the anti-inflammatory effects of methanol and aqueous extracts of these herbal teas were investigated in a UVB/HaCaT keratinocyte model with intracellular interleukin-1α (icIL-1α) accumulation as a biomarker...
October 2, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27694793/y-27632-increases-sensitivity-of-panc-1-cells-to-egcg-in-regulating-cell-proliferation-and-migration
#15
Xing Liu, Yongyi Bi
BACKGROUND The study aimed to investigate the inhibitory effect of (1R,4r)-4-((R)-1-aminoethyl)-N-(pyridin-4-yl) cyclohexanecarboxamide (Y-27632) and (-)-epigallocatechin-3-gallate (EGCG) on the proliferation and migration of PANC-1 cells. EGCG, found in green tea, has been previously shown to be one of the most abundant and powerful catechins in cancer prevention and treatment. Y-27632, a selective inhibitor of rho-associated protein kinase 1, is widely used in treating cardiovascular disease, inflammation, and cancer...
October 3, 2016: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/27689985/beneficial-effects-of-tea-and-the-green-tea-catechin-epigallocatechin-3-gallate-on-obesity
#16
Takuji Suzuki, Monira Pervin, Shingo Goto, Mamoru Isemura, Yoriyuki Nakamura
Green tea has been shown to have beneficial effects against cancer, obesity, atherosclerosis, diabetes, bacterial and viral infections, and dental caries. The catechin (-)-epigallocatechin-3-gallate (EGCG) has shown the highest biological activity among green tea catechins (GTCs) in most of the studies. While several epidemiological studies have shown the beneficial effects of tea and GTCs on obesity, some studies have failed to do this. In addition, a large number of interventional clinical studies have shown these favorable effects, and cellular and animal experiments have supported those findings, and revealed the underlying anti-obesity mechanisms...
September 29, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27668533/inhibition-of-mmp-9-by-green-tea-catechins-and-prediction-of-their-interaction-by-molecular-docking-analysis
#17
Jaganmay Sarkar, Suman Kumar Nandy, Animesh Chowdhury, Tapati Chakraborti, Sajal Chakraborti
Green tea polyphenolic catechins have been shown to prevent various types of diseases such as pulmonary hypertension (PAH), cancer and cardiac and neurological disorders. Matrix metalloproteinases (MMPs) play an important role in the development of PAH. The present study demonstrated that among the four green tea catechins (EGCG, ECG, EC and EGC), EGCG and ECG inhibit pro-/active MMP-9 activities in pulmonary artery smooth muscle cell culture supernatant. Based on the above, we investigated the interactions of pro-/active MMP-9 with the green tea catechins by computational methods...
September 23, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27651256/role-of-quercetin-benefits-in-neurodegeneration
#18
Preetham Elumalai, Sreeja Lakshmi
Neurodegenerative disorders are often life threatening and hired as an economic burden to the health-care system. Nutritional interventions principally involving polyphenols were practiced to arrest or reverse the age-related health disorders. Flavonoids, a class of dietary polyphenols, are rising to superstardom in preventing brain disorders with their potent antioxidant defense mechanism. Quercetin is a ubiquitous flavonoid reported to have all-natural myriad of health benefits. Citrus fruits, apple, onion, parsley, berries, green tea, and red wine comprise the major dietary supplements of quercetin apart from some herbal remedies like Ginkgo biloba...
2016: Advances in Neurobiology
https://www.readbyqxmd.com/read/27646578/effects-of-%C3%AF-3-fatty-acids-and-catechins-on-fatty-acid-synthase-in-the-prostate-a-randomized-controlled-trial
#19
Zhenzhen Zhang, Mark Garzotto, Tomasz M Beer, Philippe Thuillier, Stephen Lieberman, Motomi Mori, Wesley A Stoller, Paige E Farris, Jackilen Shannon
Animal and human studies suggest fish oil and green tea may have protective effect on prostate cancer. Fatty acid synthase (FAS) has been hypothesized to be linked to chemoprotective effects of both compounds. This study evaluated the independent and joint effects of fish oil (FO) and green tea supplement (epigallocatechin-3-gallate, EGCG) on FAS and Ki-67 levels in prostate tissue. Through a double-blinded, randomized controlled trial with 2 × 2 factorial design, 89 men scheduled for repeat prostate biopsy following an initial negative prostate biopsy were randomized into either FO alone (1...
September 20, 2016: Nutrition and Cancer
https://www.readbyqxmd.com/read/27645804/absorption-metabolism-anti-cancer-effect-and-molecular-targets-of-epigallocatechin-gallate-egcg-an-updated-review
#20
Ren-You Gan, Hua-Bin Li, Zhong-Quan Sui, Harold Corke
Green tea is one of the most popular beverages in the world, especially in Asian countries. Consumption of green tea has been demonstrated to possess many health benefits, which mainly attributed to the main bioactive compound epigallocatechin gallate (EGCG), a flavone-3-ol polyphenol, in green tea. EGCG is mainly absorbed in the intestine, and gut microbiota play a critical role in its metabolism prior to absorption. EGCG exhibits versatile bioactivities, with its anti-cancer effect most attracting due to the cancer preventive effect of green tea consumption, and a great number of studies intensively investigated its anti-cancer effect...
September 19, 2016: Critical Reviews in Food Science and Nutrition
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