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Hwang S, Koo I, Patterson AD, Lambert JD. Comparative urine metabolomics of mice treated with non-toxic and toxic oral doses of (-)-epigallocatechin-3-gallate. Food Funct 2023; 14:9434-9445. [PMID: 37796030 DOI: 10.1039/d3fo02710d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/06/2023]
Abstract
The green tea polyphenol, (-)-epigallocatechin-3-gallate (EGCG), has been studied for its potential positive health effects, but human and animal model studies have reported potential toxicity at high oral bolus doses. This study used liquid chromatography-mass spectrometry-based metabolomics to compare the urinary EGCG metabolite profile after administration of a single non-toxic (100 mg kg-1) or toxic (750 mg kg-1) oral bolus dose to male C57BL6/J mice to better understand how EGCG metabolism varies with dose. EGCG metabolites, including methyl, glucuronide, sulfate, and glucoside conjugates, were tentatively identified based on their mass to charge (m/z) ratio and fragment ion patterns. Partial least squares discriminant analysis (PLS-DA) results showed clear separation of the urine metabolite profiles between treatment groups. The most differentiating metabolites in the negative and positive ion modes were provisionally identified as di-glucuronidated EGCG quinone and di-glucuronidated EGCG, respectively. The presence of EGCG oxidation products at toxic dose is consistent with studies showing that EGCG toxicity is associated with oxidative stress. Relative amounts of methylated metabolites increased with dose to a lesser extent than glucuronide and sulfate metabolites, indicating that methylation is more prominent at low doses, whereas glucuronidation and sulfation may be more important at higher doses. One limitation of the current work is that the lack of commercially-available EGCG metabolite standards prevented absolute metabolite quantification and identification. Despite this limitation, these findings provide a basis for better understanding the dose-dependent changes in EGCG metabolism and advance studies on how these differences may contribute to the toxicity of high doses of EGCG.
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Affiliation(s)
- Soomee Hwang
- Department of Food Science, The Pennsylvania State University, 332 Food Science Building, University Park, PA 16802, USA.
| | - Imhoi Koo
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA 16802, USA
| | - Andrew D Patterson
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA 16802, USA
- Center for Molecular Toxicology and Carcinogenesis, The Pennsylvania State University, University Park, PA 16802, USA
| | - Joshua D Lambert
- Department of Food Science, The Pennsylvania State University, 332 Food Science Building, University Park, PA 16802, USA.
- Center for Molecular Toxicology and Carcinogenesis, The Pennsylvania State University, University Park, PA 16802, USA
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2
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Li D, Cao D, Cui Y, Sun Y, Jiang J, Cao X. The potential of epigallocatechin gallate in the chemoprevention and therapy of hepatocellular carcinoma. Front Pharmacol 2023; 14:1201085. [PMID: 37292151 PMCID: PMC10244546 DOI: 10.3389/fphar.2023.1201085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Accepted: 05/16/2023] [Indexed: 06/10/2023] Open
Abstract
Hepatocellular carcinoma (HCC), one of the most notorious malignancies globally, has a high fatality and poor prognosis. Though remarkable breakthroughs have been made in the therapeutic strategies recently, the overall survival of HCC remains unsatisfactory. Consequently, the therapy of HCC remains a great challenge. Epigallocatechin gallate (EGCG), a natural polyphenol extracted from the leaves of the tea bush, has been extensively investigated for its antitumor effects. In this review, we summarize the previous literature to elucidate the roles of EGCG in the chemoprophylaxis and therapy of HCC. Accumulating evidence has confirmed EGCG prevents and inhibits the hepatic tumorigenesis and progression through multiple biological mechanisms, mainly involving hepatitis virus infection, oxidative stress, proliferation, invasion, migration, angiogenesis, apoptosis, autophagy, and tumor metabolism. Furthermore, EGCG enhances the efficacy and sensitivity of chemotherapy, radiotherapy, and targeted therapy in HCC. In conclusion, preclinical studies have confirmed the potential of EGCG for chemoprevention and therapy of HCC under multifarious experimental models and conditions. Nevertheless, there is an urgent need to explore the safety and efficacy of EGCG in the clinical practice of HCC.
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Affiliation(s)
- Dongming Li
- Department of Gastric and Colorectal Surgery, General Surgery Center, The First Hospital of Jilin University, Changchun, Jilin, China
| | - Donghui Cao
- Division of Clinical Epidemiology, The First Hospital of Jilin University, Changchun, China
| | - Yingnan Cui
- Department of Gastric and Colorectal Surgery, General Surgery Center, The First Hospital of Jilin University, Changchun, Jilin, China
| | - Yuanlin Sun
- Department of Gastric and Colorectal Surgery, General Surgery Center, The First Hospital of Jilin University, Changchun, Jilin, China
| | - Jing Jiang
- Division of Clinical Epidemiology, The First Hospital of Jilin University, Changchun, China
| | - Xueyuan Cao
- Department of Gastric and Colorectal Surgery, General Surgery Center, The First Hospital of Jilin University, Changchun, Jilin, China
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3
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Andreu-Fernández V, Serra-Delgado M, Almeida-Toledano L, García-Meseguer À, Vieiros M, Ramos-Triguero A, Muñoz-Lozano C, Navarro-Tapia E, Martínez L, García-Algar Ó, Gómez-Roig MD. Effect of Postnatal Epigallocatechin-Gallate Treatment on Cardiac Function in Mice Prenatally Exposed to Alcohol. Antioxidants (Basel) 2023; 12:antiox12051067. [PMID: 37237934 DOI: 10.3390/antiox12051067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 04/24/2023] [Accepted: 05/02/2023] [Indexed: 05/28/2023] Open
Abstract
Prenatal alcohol exposure affects the cardiovascular health of the offspring. Epigallocatechin-3-gallate (EGCG) may be a protective agent against it, but no data are available regarding its impact on cardiac dysfunction. We investigated the presence of cardiac alterations in mice prenatally exposed to alcohol and the effect of postnatal EGCG treatment on cardiac function and related biochemical pathways. C57BL/6J pregnant mice received 1.5 g/kg/day (Mediterranean pattern), 4.5 g/kg/day (binge pattern) of ethanol, or maltodextrin until Day 19 of pregnancy. Post-delivery, treatment groups received EGCG-supplemented water. At post-natal Day 60, functional echocardiographies were performed. Heart biomarkers of apoptosis, oxidative stress, and cardiac damage were analyzed by Western blot. BNP and Hif1α increased and Nrf2 decreased in mice prenatally exposed to the Mediterranean alcohol pattern. Bcl-2 was downregulated in the binge PAE drinking pattern. Troponin I, glutathione peroxidase, and Bax increased in both ethanol exposure patterns. Prenatal alcohol exposure led to cardiac dysfunction in exposed mice, evidenced by a reduced ejection fraction, left ventricle posterior wall thickness at diastole, and Tei index. EGCG postnatal therapy restored the physiological levels of these biomarkers and improved cardiac dysfunction. These findings suggest that postnatal EGCG treatment attenuates the cardiac damage caused by prenatal alcohol exposure in the offspring.
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Affiliation(s)
- Vicente Andreu-Fernández
- Grup de Recerca Infancia i Entorn (GRIE), Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain
- Biosanitary Research Institute, Valencian International University (VIU), 46002 Valencia, Spain
| | - Mariona Serra-Delgado
- Institut de Recerca Sant Joan de Déu, 08950 Esplugues de Llobregat, Spain
- BCNatal, Barcelona Center for Maternal-Fetal and Neonatal Medicine, Hospital Sant Joan de Déu and Hospital Clínic, Universitat de Barcelona, 08950 Barcelona, Spain
| | - Laura Almeida-Toledano
- Institut de Recerca Sant Joan de Déu, 08950 Esplugues de Llobregat, Spain
- BCNatal, Barcelona Center for Maternal-Fetal and Neonatal Medicine, Hospital Sant Joan de Déu and Hospital Clínic, Universitat de Barcelona, 08950 Barcelona, Spain
| | - Àgueda García-Meseguer
- Grup de Recerca Infancia i Entorn (GRIE), Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain
- Department of Neonatology, Hospital Clínic-Maternitat, ICGON, IDIBAPS, BCNatal, 08028 Barcelona, Spain
| | - Melina Vieiros
- Grup de Recerca Infancia i Entorn (GRIE), Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain
- Department of Neonatology, Hospital Clínic-Maternitat, ICGON, IDIBAPS, BCNatal, 08028 Barcelona, Spain
| | - Anna Ramos-Triguero
- Grup de Recerca Infancia i Entorn (GRIE), Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain
- Department of Neonatology, Hospital Clínic-Maternitat, ICGON, IDIBAPS, BCNatal, 08028 Barcelona, Spain
| | - Concha Muñoz-Lozano
- Institut de Recerca Sant Joan de Déu, 08950 Esplugues de Llobregat, Spain
- BCNatal, Barcelona Center for Maternal-Fetal and Neonatal Medicine, Hospital Sant Joan de Déu and Hospital Clínic, Universitat de Barcelona, 08950 Barcelona, Spain
| | - Elisabet Navarro-Tapia
- Biosanitary Research Institute, Valencian International University (VIU), 46002 Valencia, Spain
| | - Leopoldo Martínez
- Department of Pediatric Surgery, Hospital Universitario La Paz, 28046 Madrid, Spain
| | - Óscar García-Algar
- Grup de Recerca Infancia i Entorn (GRIE), Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Spain
- Department of Neonatology, Hospital Clínic-Maternitat, ICGON, IDIBAPS, BCNatal, 08028 Barcelona, Spain
| | - María D Gómez-Roig
- Institut de Recerca Sant Joan de Déu, 08950 Esplugues de Llobregat, Spain
- BCNatal, Barcelona Center for Maternal-Fetal and Neonatal Medicine, Hospital Sant Joan de Déu and Hospital Clínic, Universitat de Barcelona, 08950 Barcelona, Spain
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Jin Y, Arroo R. The protective effects of flavonoids and carotenoids against diabetic complications-A review of in vivo evidence. Front Nutr 2023; 10:1020950. [PMID: 37032781 PMCID: PMC10080163 DOI: 10.3389/fnut.2023.1020950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Accepted: 02/24/2023] [Indexed: 04/11/2023] Open
Abstract
Diabetes mellitus is a chronic metabolic disorder caused either by inadequate insulin secretion, impaired insulin function, or both. Uncontrolled diabetes is characterized by hyperglycemia which over time leads to fatal damage to both macro-and microvascular systems, causing complications such as cardiovascular diseases, retinopathy and nephropathy. Diabetes management is conventionally delivered through modifications of diet and lifestyle and pharmacological treatment, using antidiabetic drugs, and ultimately insulin injections. However, the side effects and financial cost of medications often reduce patient compliance to treatment, negatively affecting their health outcomes. Natural phytochemicals from edible plants such as fruits and vegetables (F&V) and medicinal herbs have drawn a growing interest as potential therapeutic agents for treating diabetes and preventing the onset and progression of diabetic complications. Flavonoids, the most abundant polyphenols in the human diet, have shown antidiabetic effects in numerous in vitro and preclinical studies. The underlying mechanisms have been linked to their antioxidant, anti-inflammatory and immunomodulatory activities. Carotenoids, another major group of dietary phytochemicals, have also shown antidiabetic potential in recent in vitro and in vivo experimental models, possibly through a mechanism of action similar to that of flavonoids. However, scientific evidence on the efficacy of these phytochemicals in treating diabetes or preventing the onset and progression of its complications in clinical settings is scarce, which delays the translation of animal study evidence to human applications and also limits the knowledge on their modes of actions in diabetes management. This review is aimed to highlight the potential roles of flavonoids and carotenoids in preventing or ameliorating diabetes-related complications based on in vivo study evidence, i.e., an array of preclinical animal studies and human intervention trials. The current general consensus of the underlying mechanisms of action exerted by both groups of phytochemicals is that their anti-inflammatory action is key. However, other potential mechanisms of action are considered. In total, 50 in vivo studies were selected for a review after a comprehensive database search via PubMed and ScienceDirect from January 2002 to August 2022. The key words used for analysis are type-2 diabetes (T2DM), diabetic complications, flavonoids, carotenoids, antioxidant, anti-inflammatory, mechanisms of prevention and amelioration, animal studies and human interventions.
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Affiliation(s)
- Yannan Jin
- Leicester School of Allied Health Sciences, Faculty of Health & Life Sciences, De Montfort University, Leicester, United Kingdom
- *Correspondence: Yannan Jin,
| | - Randolph Arroo
- Leicester School of Pharmacy, Faculty of Health & Life Sciences, De Montfort University, Leicester, United Kingdom
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5
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Yang L, Jia L, Li X, Zhang K, Wang X, He Y, Hao M, Rayman MP, Zhang J. Prooxidant activity-based guideline for a beneficial combination of (-)-epigallocatechin-3-gallate and chlorogenic acid. Food Chem 2022; 386:132812. [PMID: 35364491 DOI: 10.1016/j.foodchem.2022.132812] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 03/24/2022] [Accepted: 03/24/2022] [Indexed: 11/04/2022]
Abstract
In the current study, the prooxidant activities of (-)-epigallocatechin-3-gallate (EGCG) and chlorogenic acid (CGA) were systematically compared both in multiple in vitro models and in mice. At equimolar concentrations in vitro and in vivo, EGCG displayed powerful prooxidant effects though CGA exhibited none. In vitro, though CGA and EGCG synergistically produced hydrogen peroxide, CGA was able to scavenge hydroxyl radicals generated by EGCG/copper. Consistent with the selective modulation of reactive oxygen species produced from EGCG, CGA lowered hepatotoxicity but did not perturb hepatic AMPK activation nor the increase of hepatic Nrf2-associated proteins induced by high-dose EGCG. CGA, along with low-dose EGCG, synergistically activated hepatic AMPK and increased hepatic Nrf2-associated proteins without causing toxicity in mice. This proof-of-principle study suggests that polyphenols with potent prooxidant activities (e.g., EGCG) together with antioxidant polyphenols with noticeably low prooxidant activities (e.g., CGA) may yield health benefits with a low risk of side effects.
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Affiliation(s)
- Lumin Yang
- The State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, China
| | - Lijie Jia
- The State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, China
| | - Xiuli Li
- The State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, China
| | - Ke Zhang
- The State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, China
| | - Xiaoxiao Wang
- The State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, China
| | - Yufeng He
- The State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, China
| | - Meng Hao
- The State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, China
| | - Margaret P Rayman
- Department of Nutritional Sciences, Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK
| | - Jinsong Zhang
- The State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, China.
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6
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Green Tea Polyphenol (-)-Epigallocatechin-3-Gallate (EGCG): A Time for a New Player in the Treatment of Respiratory Diseases? Antioxidants (Basel) 2022; 11:antiox11081566. [PMID: 36009285 PMCID: PMC9405266 DOI: 10.3390/antiox11081566] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 08/03/2022] [Accepted: 08/11/2022] [Indexed: 12/13/2022] Open
Abstract
(-)-Epigallocatechin-3-gallate (EGCG) is a major polyphenol of green tea that possesses a wide variety of actions. EGCG acts as a strong antioxidant which effectively scavenges reactive oxygen species (ROS), inhibits pro-oxidant enzymes including NADPH oxidase, activates antioxidant systems including superoxide dismutase, catalase, or glutathione, and reduces abundant production of nitric oxide metabolites by inducible nitric oxide synthase. ECGC also exerts potent anti-inflammatory, anti-fibrotic, pro-apoptotic, anti-tumorous, and metabolic effects via modulation of a variety of intracellular signaling cascades. Based on this knowledge, the use of EGCG could be of benefit in respiratory diseases with acute or chronic inflammatory, oxidative, and fibrotizing processes in their pathogenesis. This article reviews current information on the biological effects of EGCG in those respiratory diseases or animal models in which EGCG has been administered, i.e., acute respiratory distress syndrome, respiratory infections, COVID-19, bronchial asthma, chronic obstructive pulmonary disease, lung fibrosis, silicosis, lung cancer, pulmonary hypertension, and lung embolism, and critically discusses effectiveness of EGCG administration in these respiratory disorders. For this review, articles in English language from the PubMed database were used.
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Pang L, Jiang X, Lian X, Chen J, Song EF, Jin LG, Xia ZY, Ma HC, Cai Y. Caloric restriction-mimetics for the reduction of heart failure risk in aging heart: with consideration of gender-related differences. Mil Med Res 2022; 9:33. [PMID: 35786219 PMCID: PMC9252041 DOI: 10.1186/s40779-022-00389-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 05/30/2022] [Indexed: 11/10/2022] Open
Abstract
The literature is full of claims regarding the consumption of polyphenol or polyamine-rich foods that offer some protection from developing cardiovascular disease (CVD). This is achieved by preventing cardiac hypertrophy and protecting blood vessels through improving the function of endothelium. However, do these interventions work in the aged human hearts? Cardiac aging is accompanied by an increase in left ventricular hypertrophy, along with diastolic and systolic dysfunction. It also confers significant cardiovascular risks for both sexes. The incidence and prevalence of CVD increase sharply at an earlier age in men than women. Furthermore, the patterns of heart failure differ between sexes, as do the lifetime risk factors. Do caloric restriction (CR)-mimetics, rich in polyphenol or polyamine, delay or reverse cardiac aging equally in both men and women? This review will discuss three areas: (1) mechanisms underlying age-related cardiac remodeling; (2) gender-related differences and potential mechanisms underlying diminished cardiac response in older men and women; (3) we select a few polyphenol or polyamine rich compounds as the CR-mimetics, such as resveratrol, quercetin, curcumin, epigallocatechin gallate and spermidine, due to their capability to extend health-span and induce autophagy. We outline their abilities and issues on retarding aging in animal hearts and preventing CVD in humans. We discuss the confounding factors that should be considered for developing therapeutic strategies against cardiac aging in humans.
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Affiliation(s)
- Lei Pang
- Department of Anesthesiology, the First Hospital of Jilin University, Changchun, 130021, China
| | - Xi Jiang
- Health Promotion Center, the First Hospital of Jilin University, Changchun, 130021, China
| | - Xin Lian
- Department of Urology, the First Hospital of Jilin University, Changchun, 130021, China
| | - Jie Chen
- Henry Fok School of Biology and Agriculture, Shaoguan University, Shaoguan, 512000, Guangdong, China
| | - Er-Fei Song
- Department of Metabolic and Bariatric Surgery, Jinan University First Affiliated Hospital, Guangzhou, 510630, China.,Department of Medicine, LKS Faculty of Medicine, the University of Hong Kong, Hong Kong, China
| | - Lei-Gang Jin
- Department of Medicine, LKS Faculty of Medicine, the University of Hong Kong, Hong Kong, China.,State Key Laboratory of Pharmaceutical Biotechnology, LKS Faculty of Medicine, the University of Hong Kong, Hong Kong, China
| | - Zheng-Yuan Xia
- State Key Laboratory of Pharmaceutical Biotechnology, LKS Faculty of Medicine, the University of Hong Kong, Hong Kong, China.,Department of Anesthesiology, Affiliated Hospital of Guangdong Medical University, Zhanjiang, 524000, Guangdong, China
| | - Hai-Chun Ma
- Department of Anesthesiology, the First Hospital of Jilin University, Changchun, 130021, China.
| | - Yin Cai
- Department of Health Technology and Informatics, the Hong Kong Polytechnic University, Hong Kong, China.
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8
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Wang M, Li J, Hu T, Zhao H. Metabolic fate of tea polyphenols and their crosstalk with gut microbiota. FOOD SCIENCE AND HUMAN WELLNESS 2022. [DOI: 10.1016/j.fshw.2021.12.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Berk Ş, Kaya S, Akkol EK, Bardakçı H. A comprehensive and current review on the role of flavonoids in lung cancer-Experimental and theoretical approaches. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2022; 98:153938. [PMID: 35123170 DOI: 10.1016/j.phymed.2022.153938] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 01/04/2022] [Accepted: 01/12/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND It is well-known that flavonoids, which can be easily obtained from many fruits and vegetables are widely preferred in the treatment of some important diseases. Some researchers noted that these chemical compounds exhibit high inhibition effect against various cancer types. Many experimental studies proving this ability of the flavonoids with high antioxidant activity are available in the literature. PUROPOSE The main aim of this review is to summarize comprehensively anticancer properties of flavonoids against the lung cancer in the light of experimental studies and well-known theory and electronic structure principles. In this review article, more detailed and current information about the using of flavonoids in the treatment of lung cancer is presented considering theoretical and experimental approaches. STUDY DESIGN In addition to experimental studies including the anticancer effects of flavonoids, we emphasized the requirement of the well-known electronic structure principle in the development of anticancer drugs. For this aim, Conceptual Density Functional Theory should be considered as a powerful tool. Searching the databases including ScienceDirect, PubMed and Web of Science, the suitable reference papers for this project were selected. METHODS Theoretical tools like DFT and Molecular Docking provides important clues about anticancer behavior and drug properties of molecular systems. Conceptual Density Functional Theory and CDFT based electronic structure principles and rules like Hard and Soft Acid-Base Principle (HSAB), Maximum Hardness Principle, Minimum Polarizability, Minimum Electrophilicity Principles and Maximum Composite Hardness Rule introduced by one of the authors of this review are so useful to predict the mechanisms and powers of chemical systems. Especially, it cannot be ignored the success of HSAB Principle in the explanations and highlighting of biochemical interactions. RESULTS Both theoretical analysis and experimental studies confirmed that flavonoids have higher inhibition effect against lung cancer. In addition to many superior properties like anticancer activity, antimicrobial activity, antioxidant activity, antidiabetic effect of flavonoids, their toxicities are also explained with the help of published popular papers. Action modes of the mentioned compounds are given in detail. CONCLUSION The review includes detailed information about the mentioned electronic structure principles and rules and their applications in the cancer research. In addition, the epidemiology and types of lung cancer anticancer activity of flavonoids in lung cancer are explained in details.
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Affiliation(s)
- Şeyda Berk
- Faculty of Science, Department of Molecular Biology and Genetics, Sivas Cumhuriyet University, Sivas 58140, Turkey
| | - Savaş Kaya
- Health Services Vocational School, Department of Pharmacy, Sivas Cumhuriyet University, Sivas 58140, Turkey.
| | - Esra Küpeli Akkol
- Department of Pharmacognosy, Faculty of Pharmacy, Gazi University, Etiler, Ankara 06330, Turkey
| | - Hilal Bardakçı
- Department of Pharmacognosy, Faculty of Pharmacy, Acıbadem Mehmet Ali Aydınlar University, Istanbul 34752, Turkey
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Chaturvedi S, Malik MY, Sultana N, Jahan S, Singh S, Taneja I, Raju KSR, Rashid M, Wahajuddin M. Chromatographic separation and estimation of natural antimalarial flavonoids in biological matrices. PROCEEDINGS OF THE INDIAN NATIONAL SCIENCE ACADEMY 2021. [DOI: 10.1007/s43538-021-00050-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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11
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Sun M, Gu Y, Glisan SL, Lambert JD. Dietary cocoa ameliorates non-alcoholic fatty liver disease and increases markers of antioxidant response and mitochondrial biogenesis in high fat-fed mice. J Nutr Biochem 2021; 92:108618. [PMID: 33711421 DOI: 10.1016/j.jnutbio.2021.108618] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 12/08/2020] [Accepted: 01/19/2021] [Indexed: 12/19/2022]
Abstract
Cocoa powder, derived Theobroma cacao, is a popular food ingredient that is commonly consumed in chocolate. Epidemiological and human intervention studies have reported that chocolate consumption is associated with reduced risk of cardiometabolic diseases. Laboratory studies have reported the dietary supplementation with cocoa or cocoa polyphenols can improve obesity and obesity-related comorbidities in preclinical models. Non-alcoholic fatty liver disease (NAFLD), one such comorbidity, is a risk factor for cirrhosis and hepatocellular carcinoma. Limited studies have examined the effect of cocoa/chocolate on NAFLD and underlying hepatoprotective mechanisms. Here, we examined the hepatoprotective effects of dietary supplementation with 80 mg/g cocoa powder for 10 wks in high fat (HF)-fed obese male C57BL/6J mice. We found that cocoa-supplemented mice had lower rate of body weight gain (22%), hepatic triacylglycerols (28%), lipid peroxides (57%), and mitochondrial DNA damage (75%) than HF-fed controls. These changes were associated with higher hepatic superoxide dismutase and glutathione peroxidase enzyme activity and increased expression of markers of hepatic mitochondrial biogenesis. We also found that the hepatic protein expression of sirtuin 3 (SIRT3), and mRNA expression of peroxisome proliferator activated receptor g coactivator (PGC) 1a, nuclear respiratory factor 1, and forkhead box O3 were higher in cocoa-treated mice compared to HF-fed controls. These factors play a role in coordinating mitochondrial biogenesis and expression of mitochondrial antioxidant response factors. Our results indicate that cocoa supplementation can mitigate the severity of NAFLD in obese mice and that these effects are related to SIRT3/PGC1a-mediated increases in antioxidant response and mitochondrial biogenesis.
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Affiliation(s)
- Mingyao Sun
- Department of Food Science, The Pennsylvania State University, University Park, PA, USA
| | - Yeyi Gu
- Department of Food Science, The Pennsylvania State University, University Park, PA, USA
| | - Shannon L Glisan
- Department of Food Science, The Pennsylvania State University, University Park, PA, USA
| | - Joshua D Lambert
- Department of Food Science, The Pennsylvania State University, University Park, PA, USA; The Center for Molecular Toxicology and Carcinogenesis, The Pennsylvania State University, University Park, PA, USA.
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12
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Green tea polyphenols mitigate the plant lectins-induced liver inflammation and immunological reaction in C57BL/6 mice via NLRP3 and Nrf2 signaling pathways. Food Chem Toxicol 2020; 144:111576. [DOI: 10.1016/j.fct.2020.111576] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 06/22/2020] [Accepted: 07/01/2020] [Indexed: 12/16/2022]
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13
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Perdices L, Fuentes-Broto L, Segura F, Cuenca N, Orduna-Hospital E, Pinilla I. Epigallocatechin Gallate Slows Retinal Degeneration, Reduces Oxidative Damage, and Modifies Circadian Rhythms in P23H Rats. Antioxidants (Basel) 2020; 9:antiox9080718. [PMID: 32784376 PMCID: PMC7465727 DOI: 10.3390/antiox9080718] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 08/03/2020] [Accepted: 08/06/2020] [Indexed: 12/31/2022] Open
Abstract
Retinitis pigmentosa (RP) includes a group of genetic disorders that involve the loss of visual function due to mutations mainly in photoreceptors but also in other retinal cells. Apoptosis, retinal disorganization, and inflammation are common in the progression of the disease. Epigallocatechin gallate (EGCG) has been proved as beneficial in different eye diseases. Pigmented heterozygous P23H rat was used as an animal model of RP. Visual function was assessed by optomotor and electroretinogram (ERG) and circadian rhythms were evaluated by telemetry. Hepatic oxidative damage and antioxidant defenses were assessed using biochemical tests. The visual function of the EGCG P23H group was preserved, with a deterioration in the activity period and lower values in the interdaily stability parameter. Control rats treated with EGCG were less active than the sham group. EGCG increased antioxidant levels in P23H rats but reduced total hepatic antioxidant capacity by almost 42% in control rats compared to the sham group. We conclude that treatment with EGCG improves visual function and antioxidant status in P23H rats but diminishes antioxidant defenses in wild-type control animals, and slightly worsens activity circadian rhythms. Further studies are necessary to clarify the beneficial effects in disease conditions and in healthy organisms.
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Affiliation(s)
- Lorena Perdices
- Aragon Institute for Health Research (IIS Aragón), 50009 Zaragoza, Spain; (L.P.); (I.P.)
| | - Lorena Fuentes-Broto
- Department of Pharmacology, Physiology and Legal and Forensic Medicine, Universidad de Zaragoza, 50009 Zaragoza, Spain
- Correspondence: ; Tel.: +34-976-761-706
| | - Francisco Segura
- Department of Applied Physics, Universidad de Zaragoza, 50009 Zaragoza, Spain;
| | - Nicolás Cuenca
- Department of Physiology, Genetics and Microbiology, University of Alicante, 03690 San Vicente del Raspeig, Alicante, Spain;
| | | | - Isabel Pinilla
- Aragon Institute for Health Research (IIS Aragón), 50009 Zaragoza, Spain; (L.P.); (I.P.)
- Department of Ophthalmology, Lozano Blesa University Hospital, 50009 Zaragoza, Spain
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14
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Oketch-Rabah HA, Roe AL, Rider CV, Bonkovsky HL, Giancaspro GI, Navarro V, Paine MF, Betz JM, Marles RJ, Casper S, Gurley B, Jordan SA, He K, Kapoor MP, Rao TP, Sherker AH, Fontana RJ, Rossi S, Vuppalanchi R, Seeff LB, Stolz A, Ahmad J, Koh C, Serrano J, Low Dog T, Ko R. United States Pharmacopeia (USP) comprehensive review of the hepatotoxicity of green tea extracts. Toxicol Rep 2020; 7:386-402. [PMID: 32140423 PMCID: PMC7044683 DOI: 10.1016/j.toxrep.2020.02.008] [Citation(s) in RCA: 86] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2019] [Revised: 02/04/2020] [Accepted: 02/12/2020] [Indexed: 02/07/2023] Open
Abstract
As part of the United States Pharmacopeia's ongoing review of dietary supplement safety data, a new comprehensive systematic review on green tea extracts (GTE) has been completed. GTEs may contain hepatotoxic solvent residues, pesticide residues, pyrrolizidine alkaloids and elemental impurities, but no evidence of their involvement in GTE-induced liver injury was found during this review. GTE catechin profiles vary significantly with manufacturing processes. Animal and human data indicate that repeated oral administration of bolus doses of GTE during fasting significantly increases bioavailability of catechins, specifically EGCG, possibly involving saturation of first-pass elimination mechanisms. Toxicological studies show a hepatocellular pattern of liver injury. Published adverse event case reports associate hepatotoxicity with EGCG intake amounts from 140 mg to ∼1000 mg/day and substantial inter-individual variability in susceptibility, possibly due to genetic factors. Based on these findings, USP included a cautionary labeling requirement in its Powdered Decaffeinated Green Tea Extract monograph that reads as follows: "Do not take on an empty stomach. Take with food. Do not use if you have a liver problem and discontinue use and consult a healthcare practitioner if you develop symptoms of liver trouble, such as abdominal pain, dark urine, or jaundice (yellowing of the skin or eyes)."
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Key Words
- ADME, Absorption, distribution, metabolism, and excretion
- ALP, alkaline phosphatase
- ALT, alanine aminotransferase
- AST, aspartate aminotransferase
- AUC, area under the curve
- Bw, body weight
- C, Catechin
- CAM, causality assessment method
- CG, (+)‐catechin‐3‐gallate
- CIH, Concanavalin A-induced hepatitis
- CMC, chemistry, manufacturing, and controls
- COMT, catechol‐O‐methyltransferase
- Camellia sinensis
- ConA, Concanavalin A
- DILI, drug‐induced liver injury
- DILIN, Drug‐Induced Liver Injury Network
- DO, Diversity Outbred
- DS, Dietary Supplement
- DSAE, JS3 USP Dietary Supplements Admission Evaluations Joint Standard-Setting Subcommittee
- Dietary supplements
- EC, (–)‐epicatechin
- ECG, (‐)‐epicatechin‐3‐gallate
- EFSA, European Food Safety Authority
- EGC, (–)‐epigallocatechin
- EGCG, (–)‐epigallocatechin‐3‐gallate
- FDA, United States Food and Drug Administration
- GC, (+)‐gallocatechin
- GCG, (–)‐gallocatechin‐3‐gallate
- GT(E), green tea or green tea extract
- GT, green tea
- GTE, green tea extract
- GTEH, EP Green Tea Extract Hepatotoxicity Expert Panel
- Green tea
- Green tea extract
- HDS, herbal dietary supplement
- HPMC, Hydroxypropyl methylcellulose
- Hepatotoxicity
- LD50, lethal dose, median
- LFT(s), liver function test(s)
- LT(s), Liver test(s)
- Liver injury
- MGTT, Minnesota Green Tea Trial
- MIDS, multi-ingredient dietary supplement
- MRL, maximum residue limit
- NAA, N-acetyl aspartate
- NIDDK, National Institute of Diabetes and Digestive and Kidney Diseases
- NIH, National Institutes of Health
- NOAEL, no observed adverse effect level
- NTP, National Toxicology Program
- OSM, online supplementary material
- PAs, Pyrrolizidine Alkaloids
- PD-1, Programmed death domain-1
- PDGTE, powdered decaffeinated green tea extract
- PK/PD, pharmacokinetics and pharmacodynamics
- RUCAM, Roussel Uclaf Causality Assessment Method
- SIDS, single-ingredient dietary supplement
- TGF-beta, Transforming growth factor beta
- USP, United States Pharmacopeia
- γ-GT, Gamma-glutamyl transferase
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Affiliation(s)
- Hellen A. Oketch-Rabah
- U.S. Pharmacopeial Convention, Rockville, MD, USA
- United States Pharmacopeia Green Tea Hepatotoxicity Expert Panel (USP GTEH EP, 2015-2020 cycle), Rockville, MD, USA
| | - Amy L. Roe
- United States Pharmacopeia Green Tea Hepatotoxicity Expert Panel (USP GTEH EP, 2015-2020 cycle), Rockville, MD, USA
- Vice Chair, (USP GTEH EP, 2015-2020 cycle)
| | - Cynthia V. Rider
- United States Pharmacopeia Green Tea Hepatotoxicity Expert Panel (USP GTEH EP, 2015-2020 cycle), Rockville, MD, USA
| | - Herbert L. Bonkovsky
- U.S. FDA Liaison to the USP GTEH EP (2015-2020 cycle)
- Section on Gastroenterology & Hepatology, Department of Internal Medicine, Wake Forest University School of Medicine, Winston-Salem, NC, 27157, USA
| | - Gabriel I. Giancaspro
- U.S. Pharmacopeial Convention, Rockville, MD, USA
- United States Pharmacopeia Green Tea Hepatotoxicity Expert Panel (USP GTEH EP, 2015-2020 cycle), Rockville, MD, USA
| | - Victor Navarro
- United States Pharmacopeia Green Tea Hepatotoxicity Expert Panel (USP GTEH EP, 2015-2020 cycle), Rockville, MD, USA
- Expert Members of the Drug Induced Liver Injury Network (DILIN), USA
| | - Mary F. Paine
- United States Pharmacopeia Green Tea Hepatotoxicity Expert Panel (USP GTEH EP, 2015-2020 cycle), Rockville, MD, USA
- Department of Pharmaceutical Sciences, College of Pharmacy and Pharmaceutical Sciences, Washington State University, Spokane, WA, USA
| | - Joseph M. Betz
- United States Pharmacopeia Green Tea Hepatotoxicity Expert Panel (USP GTEH EP, 2015-2020 cycle), Rockville, MD, USA
| | - Robin J. Marles
- United States Pharmacopeia Green Tea Hepatotoxicity Expert Panel (USP GTEH EP, 2015-2020 cycle), Rockville, MD, USA
| | - Steven Casper
- U.S. FDA Liaison to the USP GTEH EP (2015-2020 cycle)
| | - Bill Gurley
- United States Pharmacopeia Green Tea Hepatotoxicity Expert Panel (USP GTEH EP, 2015-2020 cycle), Rockville, MD, USA
| | - Scott A. Jordan
- United States Pharmacopeia Green Tea Hepatotoxicity Expert Panel (USP GTEH EP, 2015-2020 cycle), Rockville, MD, USA
| | - Kan He
- United States Pharmacopeia Green Tea Hepatotoxicity Expert Panel (USP GTEH EP, 2015-2020 cycle), Rockville, MD, USA
| | - Mahendra P. Kapoor
- United States Pharmacopeia Green Tea Hepatotoxicity Expert Panel (USP GTEH EP, 2015-2020 cycle), Rockville, MD, USA
| | - Theertham P. Rao
- United States Pharmacopeia Green Tea Hepatotoxicity Expert Panel (USP GTEH EP, 2015-2020 cycle), Rockville, MD, USA
| | - Averell H. Sherker
- Expert Members of the Drug Induced Liver Injury Network (DILIN), USA
- Liver Diseases Research Branch National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, 6707 Democracy Blvd., Bethesda, MD, USA
| | - Robert J. Fontana
- Expert Members of the Drug Induced Liver Injury Network (DILIN), USA
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Simona Rossi
- Expert Members of the Drug Induced Liver Injury Network (DILIN), USA
| | | | - Leonard B. Seeff
- Expert Members of the Drug Induced Liver Injury Network (DILIN), USA
| | - Andrew Stolz
- Expert Members of the Drug Induced Liver Injury Network (DILIN), USA
| | - Jawad Ahmad
- Expert Members of the Drug Induced Liver Injury Network (DILIN), USA
| | - Christopher Koh
- Expert Members of the Drug Induced Liver Injury Network (DILIN), USA
- Liver Diseases Branch, Intramural Research Program, National Institute of Diabetes and Digestive and Kidney Diseases, 10 Center Drive, Building 10, Rm 9B-16, Bethesda, MD, 20892,USA
| | - Jose Serrano
- Expert Members of the Drug Induced Liver Injury Network (DILIN), USA
- Liver Diseases Research Branch National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, 6707 Democracy Blvd., Bethesda, MD, USA
| | - Tieraona Low Dog
- United States Pharmacopeia Green Tea Hepatotoxicity Expert Panel (USP GTEH EP, 2015-2020 cycle), Rockville, MD, USA
| | - Richard Ko
- United States Pharmacopeia Green Tea Hepatotoxicity Expert Panel (USP GTEH EP, 2015-2020 cycle), Rockville, MD, USA
- Chair (USP GTEH EP, 2015-2020 cycle)
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15
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Tang GY, Meng X, Gan RY, Zhao CN, Liu Q, Feng YB, Li S, Wei XL, Atanasov AG, Corke H, Li HB. Health Functions and Related Molecular Mechanisms of Tea Components: An Update Review. Int J Mol Sci 2019; 20:E6196. [PMID: 31817990 PMCID: PMC6941079 DOI: 10.3390/ijms20246196] [Citation(s) in RCA: 160] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2019] [Revised: 12/02/2019] [Accepted: 12/06/2019] [Indexed: 02/07/2023] Open
Abstract
Tea is widely consumed all over the world. Generally, tea is divided into six categories: White, green, yellow, oolong, black, and dark teas, based on the fermentation degree. Tea contains abundant phytochemicals, such as polyphenols, pigments, polysaccharides, alkaloids, free amino acids, and saponins. However, the bioavailability of tea phytochemicals is relatively low. Thus, some novel technologies like nanotechnology have been developed to improve the bioavailability of tea bioactive components and consequently enhance the bioactivity. So far, many studies have demonstrated that tea shows various health functions, such as antioxidant, anti-inflammatory, immuno-regulatory, anticancer, cardiovascular-protective, anti-diabetic, anti-obesity, and hepato-protective effects. Moreover, it is also considered that drinking tea is safe to humans, since reports about the severe adverse effects of tea consumption are rare. In order to provide a better understanding of tea and its health potential, this review summarizes and discusses recent literature on the bioactive components, bioavailability, health functions, and safety issues of tea, with special attention paid to the related molecular mechanisms of tea health functions.
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Affiliation(s)
- Guo-Yi Tang
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou 510080, China; (G.-Y.T.); (X.M.); (C.-N.Z.); (Q.L.)
- School of Chinese Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, No. 10 Sassoon Road, Pokfulam, Hong Kong 999077, China; (Y.-B.F.); (S.L.)
| | - Xiao Meng
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou 510080, China; (G.-Y.T.); (X.M.); (C.-N.Z.); (Q.L.)
| | - Ren-You Gan
- Department of Food Science & Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China; (X.-L.W.); (H.C.)
- Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu 610213, China
| | - Cai-Ning Zhao
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou 510080, China; (G.-Y.T.); (X.M.); (C.-N.Z.); (Q.L.)
| | - Qing Liu
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou 510080, China; (G.-Y.T.); (X.M.); (C.-N.Z.); (Q.L.)
| | - Yi-Bin Feng
- School of Chinese Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, No. 10 Sassoon Road, Pokfulam, Hong Kong 999077, China; (Y.-B.F.); (S.L.)
| | - Sha Li
- School of Chinese Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, No. 10 Sassoon Road, Pokfulam, Hong Kong 999077, China; (Y.-B.F.); (S.L.)
| | - Xin-Lin Wei
- Department of Food Science & Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China; (X.-L.W.); (H.C.)
| | - Atanas G. Atanasov
- The Institute of Genetics and Animal Breeding, Polish Academy of Sciences, Jastrzębiec, 05-552 Magdalenka, Poland;
| | - Harold Corke
- Department of Food Science & Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China; (X.-L.W.); (H.C.)
| | - Hua-Bin Li
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou 510080, China; (G.-Y.T.); (X.M.); (C.-N.Z.); (Q.L.)
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16
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Wang X, Yang L, Wang J, Zhang Y, Dong R, Wu X, Yang CS, Zhang Z, Zhang J. A mouse model of subacute liver failure with ascites induced by step-wise increased doses of (-)-epigallocatechin-3-gallate. Sci Rep 2019; 9:18102. [PMID: 31792332 PMCID: PMC6888815 DOI: 10.1038/s41598-019-54691-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2019] [Accepted: 11/18/2019] [Indexed: 12/20/2022] Open
Abstract
Acute liver failure is divided into hyperacute, acute and subacute liver failure. Ascites is a common complication of subacute liver failure. Although animal models of acute liver failure have been established, the study of the pathogenesis of subacute liver failure with ascites complication is hampered by the lack of experimental animal model. The present study aimed at providing a mouse model of subacute liver failure with ascites complication. Kunming mice were intraperitoneally injected with (-)-epigallocatechin-3-gallate (EGCG), a redox-active polyphenol from green tea, for 32 consecutive days with step-wise increased dosage. The EGCG treatment resulted in liver failure as evidenced by extensive hepatocyte necrosis observed histologically along with significant elevation of serum alanine aminotransferase, aspartate aminotransferase, total bilirubin and direct bilirubin levels as well as significant reduction of serum albumin. Liver fibrosis was not observed by Masson staining and fibrosis-associated proteins were not increased. The mortality was less than 12% and the survival mice developed noticeable ascites. Hepatic thioredoxin and glutathione systems were activated by the EGCG. These adaptive responses might render most mice tolerable to the EGCG treatment. The EGCG treatment significantly up-regulated renal urea transporter A1 and promoted its trafficking to apical membrane. These alterations, known to increase water reabsorption, may be responsible, at least in part, for the formation of the ascites. Overall, the mice treated with gradually elevated doses of EGCG exhibits some of the features observed in patients with subacute liver failure, especially ascites. This mouse model is a useful tool for investigating the pathogenesis of subacute liver failure with ascites complication.
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Affiliation(s)
- Xiaoxiao Wang
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, Anhui, China
| | - Lumin Yang
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, Anhui, China
| | - Jiajia Wang
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, Anhui, China
| | - Yafei Zhang
- Department of Infectious Diseases, The Second Affiliated Hospital, Anhui Medical University, Hefei, Anhui, China
- School of Pharmacy, Anhui Medical University, Hefei, Anhui, P.R. China
| | - Ruixia Dong
- Department of Forestry and Technology, Lishui Vocational and Technical College, Lishui, Zhejiang, China
| | - Ximing Wu
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, Anhui, China
| | - Chung S Yang
- Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, Piscataway, NJ, USA
- International Joint Research Laboratory of Tea Chemistry and Health Effects, Anhui Agricultural University, Hefei, Anhui, China
| | - Zhenhua Zhang
- Department of Infectious Diseases, The Second Affiliated Hospital, Anhui Medical University, Hefei, Anhui, China.
- School of Pharmacy, Anhui Medical University, Hefei, Anhui, P.R. China.
| | - Jinsong Zhang
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, Anhui, China.
- International Joint Research Laboratory of Tea Chemistry and Health Effects, Anhui Agricultural University, Hefei, Anhui, China.
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17
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Song Y, Li X, Gong X, Zhao X, Ma Z, Xia T, Gu X. Green tea polyphenols improve isoflurane-induced cognitive impairment via modulating oxidative stress. J Nutr Biochem 2019; 73:108213. [DOI: 10.1016/j.jnutbio.2019.07.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2019] [Revised: 06/04/2019] [Accepted: 07/02/2019] [Indexed: 12/24/2022]
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18
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Chen T, Yang CS. Biological fates of tea polyphenols and their interactions with microbiota in the gastrointestinal tract: implications on health effects. Crit Rev Food Sci Nutr 2019; 60:2691-2709. [DOI: 10.1080/10408398.2019.1654430] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Tingting Chen
- School of Food Science & Technology, State Key Laboratory of Food Science & Technology, Nanchang University, Nanchang, China
| | - Chung S. Yang
- Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, Piscataway, NJ, USA
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19
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Zhang L, He Y, Wu X, Zhao G, Zhang K, Yang CS, Reiter RJ, Zhang J. Melatonin and (-)-Epigallocatechin-3-Gallate: Partners in Fighting Cancer. Cells 2019; 8:cells8070745. [PMID: 31331008 PMCID: PMC6678710 DOI: 10.3390/cells8070745] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2019] [Revised: 07/11/2019] [Accepted: 07/16/2019] [Indexed: 12/24/2022] Open
Abstract
We have demonstrated previously that melatonin attenuates hepatotoxicity triggered by high doses of (−)-epigallocatechin-3-gallate (EGCG) in mice. The current work investigated the influence of melatonin on the oncostatic activity of EGCG in two cancer cell lines, wherein melatonin induced an opposite response of p21. In human tongue cancer TCA8113 cells, melatonin-induced p21 and EGCG-mediated formation of quinoproteins were positively associated with the oncostatic effects of melatonin and EGCG. Melatonin-stimulated an increase in p21 which was correlated with a pronounced nuclear translocation of thioredoxin 1 and thioredoxin reductase 1, both of which are known to induce p21 via promoting p53 trans-activation. Melatonin did not influence the EGCG-mediated increase of quinoprotein formation nor did EGCG impair melatonin-induced p21 up-regulation. Co-treatment with both agents enhanced the cell-killing effect as well as the inhibitory activities against cell migration and colony formation. It is known that p21 also plays a powerful anti-apoptotic role in some cancer cells and confers these cells with a survival advantage, making it a target for therapeutic suppression. In human hepatocellular carcinoma HepG2 cells, melatonin suppressed p21 along with the induction of pro-survival proteins, PI3K and COX-2. However, EGCG prevented against melatonin-induced PI3K and COX-2, and melatonin probably sensitized HepG2 cells to EGCG cytotoxicity via down-regulating p21, Moreover, COX-2 and HO-1 were significantly reduced only by the co-treatment, and melatonin aided EGCG to achieve an increased inhibition on Bcl2 and NFκB. These events occurring in the co-treatment collectively resulted in an enhanced cytotoxicity. In addition, the co-treatment also enhanced the inhibitory activities against cell migration and colony formation. Overall, the results gathered from these two cancer cell lines with a divergent p21 response to melatonin show that the various oncostatic activities of melatonin and EGCG together are more robust than each agent alone, suggesting that they may be useful partners in fighting cancer.
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Affiliation(s)
- Lingyun Zhang
- Laboratory of Redox Biology, State Key Laboratory of Tea Plant Biology and Resources Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei 230000, China
| | - Yufeng He
- Laboratory of Redox Biology, State Key Laboratory of Tea Plant Biology and Resources Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei 230000, China
| | - Ximing Wu
- Laboratory of Redox Biology, State Key Laboratory of Tea Plant Biology and Resources Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei 230000, China
| | - Guangshan Zhao
- Laboratory of Redox Biology, State Key Laboratory of Tea Plant Biology and Resources Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei 230000, China
| | - Ke Zhang
- Laboratory of Redox Biology, State Key Laboratory of Tea Plant Biology and Resources Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei 230000, China
| | - Chung S Yang
- Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
| | - Russel J Reiter
- Department of Cellular and Structural Biology, UT Health Science Center, San Antonio, TX 78229, USA
| | - Jinsong Zhang
- Laboratory of Redox Biology, State Key Laboratory of Tea Plant Biology and Resources Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei 230000, China.
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20
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Yang CS, Zhang J. Studies on the Prevention of Cancer and Cardiometabolic Diseases by Tea: Issues on Mechanisms, Effective Doses, and Toxicities. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:5446-5456. [PMID: 30541286 DOI: 10.1021/acs.jafc.8b05242] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
This article presents a brief overview of studies on the prevention of cancer and cardiometabolic diseases by tea. The major focus is on green tea catechins concerning the effective doses used, the mechanisms of action, and possible toxic effects. In cancer prevention by tea, the laboratory results are strong; however, the human data are inconclusive, and the effective doses used in some human trials approached toxic levels. In studies of the alleviation of metabolic syndrome, diabetes, and prevention of cardiovascular diseases, the results from human studies are stronger in individuals who consume 3-4 cups of tea (600-900 mg of catechins) or more per day. The tolerable upper intake level of tea catechins has been set at 300 mg of (-)-epigallocatechin-3-gallate in a bolus dose per day in some European countries. The effects of doses and dosage forms on catechin toxicity, the mechanisms involved, and factors that may affect toxicity are discussed.
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Affiliation(s)
- Chung S Yang
- Department of Chemical Biology, Ernest Mario School of Pharmacy , Rutgers, The State University of New Jersey , 164 Frelinghuysen Road , Piscataway , New Jersey 08854-8020 , United States
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21
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Fernandez ME, Kembro JM, Ballesteros ML, Caliva JM, Marin RH, Labaque MC. Dynamics of thymol dietary supplementation in quail (Coturnix japonica): Linking bioavailability, effects on egg yolk total fatty acids and performance traits. PLoS One 2019; 14:e0216623. [PMID: 31071185 PMCID: PMC6508865 DOI: 10.1371/journal.pone.0216623] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 04/24/2019] [Indexed: 01/16/2023] Open
Abstract
Phytogenic additives such as thymol are encountering growing interest in the poultry industry. However, there are still questions concerning dynamics of their bioavailability, biological action, optimal dosage and duration of supplementation needed to achieve meaningful effects, as well as persistence of induced changes after supplement withdrawal. We studied the link between the dynamics of free thymol concentration and the changes in fatty acids composition in quail egg yolk, both during a month-long chronic dietary supplementation and after 3 weeks of supplement withdrawal (post-supplementation). Fifty, 85 days-old, female quail of homogeneous body weights (251±1g) in egg-laying peak were used. To evaluate potential dose-dependent effects, three increasing doses 2, 4, and 6.25 g of thymol/kg of feed (THY2, THY4 and THY6, respectively) and two controls were evaluated (n = 10). In parallel, we assessed the concomitant changes in free thymol excretion, potential liver histopathological changes, and birds´ performance traits. Egg yolk and droppings show a dose-dependent increase in THY concentration after 9 days of supplementation and a decrease after post-supplementation. In egg yolk, these changes were accompanied by reduced saturated fatty acid concentrations achieved by 28 days of supplementation in THY2 and 14 days of supplementation in THY4 and THY6. However, after post-supplementation the aforementioned effect disappeared in THY2 but not in THY4 and THY6. While THY2 failed to increase polyunsaturated fatty acids, THY4 and THY6 increased polyunsaturated fatty acids by day 14 of supplementation and remained increased after post-supplementation. Fatty acids changes induced by thymol are consistent with improved nutritional quality of eggs. No treatment effects were observed in liver histopathology and female performance. Findings suggest that both dose of thymol and duration of supplementation modulate thymol and fatty acids concentrations in egg yolk and thymol concentration in droppings. Furthermore, the persistence of those effects after post-supplementation period is also a dose-dependent phenomenon.
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Affiliation(s)
- Maria E. Fernandez
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Investigaciones Biológicas y Tecnológicas (IIByT), Córdoba, Argentina
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales, Instituto de Ciencia y Tecnología de los Alimentos (ICTA), Córdoba, Argentina
| | - Jackelyn M. Kembro
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Investigaciones Biológicas y Tecnológicas (IIByT), Córdoba, Argentina
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales, Instituto de Ciencia y Tecnología de los Alimentos (ICTA), Córdoba, Argentina
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales, Cátedra de Química Biológica, Córdoba, Argentina
- * E-mail: (MCL); (JMK)
| | - Maria L. Ballesteros
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Diversidad y Ecología Animal (IDEA), Córdoba, Argentina
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales, Cátedra de Diversidad Animal II, Córdoba, Argentina
| | - Jorge M. Caliva
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Investigaciones Biológicas y Tecnológicas (IIByT), Córdoba, Argentina
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales, Instituto de Ciencia y Tecnología de los Alimentos (ICTA), Córdoba, Argentina
| | - Raul H. Marin
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Investigaciones Biológicas y Tecnológicas (IIByT), Córdoba, Argentina
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales, Instituto de Ciencia y Tecnología de los Alimentos (ICTA), Córdoba, Argentina
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales, Cátedra de Química Biológica, Córdoba, Argentina
| | - Maria C. Labaque
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Investigaciones Biológicas y Tecnológicas (IIByT), Córdoba, Argentina
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales, Instituto de Ciencia y Tecnología de los Alimentos (ICTA), Córdoba, Argentina
- Universidad Nacional de Córdoba, Facultad de Ciencias Exactas, Físicas y Naturales, Cátedra de Ecología, Córdoba, Argentina
- * E-mail: (MCL); (JMK)
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Xing L, Zhang H, Qi R, Tsao R, Mine Y. Recent Advances in the Understanding of the Health Benefits and Molecular Mechanisms Associated with Green Tea Polyphenols. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:1029-1043. [PMID: 30653316 DOI: 10.1021/acs.jafc.8b06146] [Citation(s) in RCA: 274] [Impact Index Per Article: 54.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Tea, leaf, or bud from the plant Camellia sinensis, make up some of the beverages popularly consumed in different parts of the world as green tea, oolong tea, or black tea. More particularly, as a nonfermented tea, green tea has gained more renown because of the significant health benefits assigned to its rich content in polyphenols. As a main constituent, green tea polyphenols were documented for their antioxidant, anti-inflammation, anticancer, anticardiovascular, antimicrobial, antihyperglycemic, and antiobesity properties. Recent reports demonstrate that green tea may exert a positive effect on the reduction of medical chronic conditions such as cardiovascular disease, cancer, Alzheimer's disease, Parkinson's disease, and diabetes. The health benefits of green teas, in particular EGCG, are widely investigated, and these effects are known to be primarily associated with the structure and compositions of its polyphenols. This Review focuses on the diverse constituents of green tea polyphenols and their molecular mechanisms from the perspective of their potential therapeutic function. Recent advances of green tea polyphenols on their bioavailability, bioaccessibility, and microbiota were also summarized in this article. Dietary supplementation with green tea represents an attractive alternative toward promoting human health.
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Affiliation(s)
- Lujuan Xing
- Department of Food Science , University of Guelph , Guelph , Ontario N1G 2W1 , Canada
- Key Lab of Meat Processing and Quality Control, College of Food Science and Technology , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , China
| | - Hua Zhang
- Guelph Food Research Centre, Agriculture and Agri-Food Canada , 93 Stone Road West , Guelph , Ontario N1G 5C9 , Canada
| | - Ruili Qi
- Department of Food Science , University of Guelph , Guelph , Ontario N1G 2W1 , Canada
| | - Rong Tsao
- Guelph Food Research Centre, Agriculture and Agri-Food Canada , 93 Stone Road West , Guelph , Ontario N1G 5C9 , Canada
| | - Yoshinori Mine
- Department of Food Science , University of Guelph , Guelph , Ontario N1G 2W1 , Canada
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23
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Koonyosying P, Kongkarnka S, Uthaipibull C, Svasti S, Fucharoen S, Srichairatanakool S. Green tea extract modulates oxidative tissue injury in beta-thalassemic mice by chelation of redox iron and inhibition of lipid peroxidation. Biomed Pharmacother 2018; 108:1694-1702. [PMID: 30372872 DOI: 10.1016/j.biopha.2018.10.017] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2018] [Revised: 09/10/2018] [Accepted: 10/03/2018] [Indexed: 02/08/2023] Open
Abstract
Iron overload in patients with β-thalassemia can cause oxidative organ dysfunction. Iron chelation along with antioxidant supplementation can ameliorate such complications and prolong lives. Green tea extract (GTE) rich in epigallocatechin-3-gallate (EGCG) exhibits anti-oxidation and iron chelation properties in β-knockout thalassemic (BKO) mice diagnosed with iron overload. We investigated the effects of GTE and deferiprone (DFP) alone in combination with one another, and upon the levels of redox-active iron, lipid-peroxidation product, insulin and hepcidin in BKO mice. A state of iron overload was induced in the mice via a trimethylhexanoyl-ferrocene supplemented (Fe) diet for 3 months, and the mice were treated daily with either: DFP (50 mg/kg), DFP (50 mg/kg) plus GTE (50 mg EGCG equivalent/kg), or GTE alone for 2 months. Plasma non-transferrin bound iron (NTBI), malondialdehyde (MDA), alanine aminotransferase (ALT), aspartate aminotransferase (AST), hepcidin and insulin; tissue iron and MDA were measured. DFP, GTE and GTE + DFP effectively decreased plasma MDA (p < 0.05), NTBI and ALT, and increased plasma hepcidin and insulin. All the treatments also reduced iron accumulation and MDA production in both the pancreas and liver in the mice. However, the combination therapy demonstrated no advantages over monotherapy. The findings suggest GTE improved liver and pancreatic β-cell functions in iron-overloaded β-thalassemia mice by diminishing redox iron and free radicals, while inhibiting lipid peroxidation. Consequently, there are indications that GTE holds significant potential for clinical use.
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Affiliation(s)
- Pimpisid Koonyosying
- Department of Biochemistry, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
| | - Sarawut Kongkarnka
- Department of Pathology, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
| | - Chairat Uthaipibull
- Protein-Ligand Engineering and Molecular Biology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency, Thailand Science Park, Pathum Thani, Thailand
| | - Saovaros Svasti
- Thalassemia Research Center, Institute of Molecular Bioscience, Mahidol University Salaya Campus, Nakornpathom, Thailand
| | - Suthat Fucharoen
- Thalassemia Research Center, Institute of Molecular Bioscience, Mahidol University Salaya Campus, Nakornpathom, Thailand
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24
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Bedhiafi T, Charradi K, Azaiz MB, Mahmoudi M, Msakni I, Jebari K, Bouziani A, Limam F, Aouani E. Supplementation of grape seed and skin extract to orlistat therapy prevents high-fat diet-induced murine spleen lipotoxicity. Appl Physiol Nutr Metab 2018; 43:782-794. [PMID: 29514007 DOI: 10.1139/apnm-2017-0743] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2023]
Abstract
Spleen is the largest lymphoid organ and obesity is related to an elevated risk of immunity dysfunction. The mechanism whereby fat adversely affects the spleen is poorly understood. This study was designed to assess the effectiveness of grape seed and skin extract (GSSE) and orlistat (Xenical, Xe) on high-fat diet (HFD)-induced spleen lipotoxicity. Obese rats were treated either with GSSE (4 g/kg body weight) or Xe (2 mg/kg body weight) or GSSE+Xe and monitored for weight loss for 3 months. Animals were then sacrificed and their spleen used for the evaluation of lipotoxicity-induced oxidative stress and inflammation as well as the putative protection afforded by GSSE and Xe treatment. HFD induced body weight gain and glycogen accumulation into the spleen; ectopic deposition of cholesterol and triglycerides and an oxidative stress characterized by increased lipoperoxidation and carbonylation; inhibition of antioxidant enzyme activities, such as catalase, glutathione peroxidase, and superoxide dismutase; depletion of zinc and copper; and a concomitant increase in calcium. HFD also increased plasma pro-inflammatory cytokines, such as interleukin (IL)-6, IL-17A, tumour necrosis factor alpha, and C-reactive protein, and decreased plasma IL-10 and adiponectin. Importantly, GSSE counteracted all the deleterious effects of HFD on spleen (i.e., lipotoxicity, oxidative stress, and inflammation) and the best protection was obtained when combining Xe+GSSE. Combining GSSE with Xe prevented against fat-induced spleen lipotoxicity, oxidative stress, and inflammation; this combination may be beneficial in other diseases related to the spleen.
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Affiliation(s)
- Takwa Bedhiafi
- a Faculty of Sciences of Bizerte, University of Carthage, 7021 Jarzouna, Tunisia
- b Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, 2050 Hammam Lif, Tunisia
| | - Kamel Charradi
- a Faculty of Sciences of Bizerte, University of Carthage, 7021 Jarzouna, Tunisia
- b Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, 2050 Hammam Lif, Tunisia
| | - Mouna Ben Azaiz
- c Immunology Department, Military Hospital of Tunis, Tunis, 1008, Tunisia
| | - Mohamed Mahmoudi
- a Faculty of Sciences of Bizerte, University of Carthage, 7021 Jarzouna, Tunisia
- b Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, 2050 Hammam Lif, Tunisia
| | - Issam Msakni
- d Anatomy and Cyto-Pathology Department, Military Hospital, Mont-Fleury, Tunis, 1008, Tunisia
| | - Khawla Jebari
- a Faculty of Sciences of Bizerte, University of Carthage, 7021 Jarzouna, Tunisia
- b Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, 2050 Hammam Lif, Tunisia
| | - Ammar Bouziani
- d Anatomy and Cyto-Pathology Department, Military Hospital, Mont-Fleury, Tunis, 1008, Tunisia
| | - Ferid Limam
- b Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, 2050 Hammam Lif, Tunisia
| | - Ezzedine Aouani
- a Faculty of Sciences of Bizerte, University of Carthage, 7021 Jarzouna, Tunisia
- b Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, 2050 Hammam Lif, Tunisia
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25
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Paradoxical cardiotoxicity of intraperitoneally-injected epigallocatechin gallate preparation in diabetic mice. Sci Rep 2018; 8:7880. [PMID: 29777127 PMCID: PMC5959847 DOI: 10.1038/s41598-018-25901-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Accepted: 05/01/2018] [Indexed: 02/06/2023] Open
Abstract
Numerous clinical and bioavailability studies addressed epigallocatechin gallate (EGCG) beneficial effects; however, our previous work revealed EGCG-induced nephrotoxicity in the presence of diabetes. In this study, the potential myocardial toxicity of EGCG preparation (100 mg/kg/day, IP; 4 days) in diabetic mice injected with streptozotocin (STZ; 150 mg/kg, IP) was investigated. Diabetic mice receiving EGCG preparation showed electrocardiographic changes in addition to elevation of both serum creatine kinase-MB and troponin-I levels accompanied by microscopic myocardial damage. Additionally, myocardial NADPH oxidase, lipid peroxides and nitrotyrosine were increased in the vicinity of decreases of nuclear factor erythroid 2-related factor 2, hemeoxygenase-1, reduced glutathione, total antioxidant capacity, glutathione peroxidase and reductase and heat shock protein 90. Moreover, in diabetic mice, EGCG preparation increased myocardial nuclear factor-kappa B and tumor necrosis factor-alpha in addition to pronounced overexpression of inducible nitric oxide synthase and active caspase-3. Therefore, this study substantiates that EGCG-mediated deterioration compromises diabetes-induced cardiotoxicity to solidify our previous report for its potential nephrotoxicity in the same experimental setting.
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Younes M, Aggett P, Aguilar F, Crebelli R, Dusemund B, Filipič M, Frutos MJ, Galtier P, Gott D, Gundert-Remy U, Lambré C, Leblanc JC, Lillegaard IT, Moldeus P, Mortensen A, Oskarsson A, Stankovic I, Waalkens-Berendsen I, Woutersen RA, Andrade RJ, Fortes C, Mosesso P, Restani P, Arcella D, Pizzo F, Smeraldi C, Wright M. Scientific opinion on the safety of green tea catechins. EFSA J 2018; 16:e05239. [PMID: 32625874 PMCID: PMC7009618 DOI: 10.2903/j.efsa.2018.5239] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The EFSA ANS Panel was asked to provide a scientific opinion on the safety of green tea catechins from dietary sources including preparations such as food supplements and infusions. Green tea is produced from the leaves of Camellia sinensis (L.) Kuntze, without fermentation, which prevents the oxidation of polyphenolic components. Most of the polyphenols in green tea are catechins. The Panel considered the possible association between the consumption of (-)-epigallocatechin-3-gallate (EGCG), the most relevant catechin in green tea, and hepatotoxicity. This scientific opinion is based on published scientific literature, including interventional studies, monographs and reports by national and international authorities and data received following a public 'Call for data'. The mean daily intake of EGCG resulting from the consumption of green tea infusions ranges from 90 to 300 mg/day while exposure by high-level consumers is estimated to be up to 866 mg EGCG/day, in the adult population in the EU. Food supplements containing green tea catechins provide a daily dose of EGCG in the range of 5-1,000 mg/day, for adult population. The Panel concluded that catechins from green tea infusion, prepared in a traditional way, and reconstituted drinks with an equivalent composition to traditional green tea infusions, are in general considered to be safe according to the presumption of safety approach provided the intake corresponds to reported intakes in European Member States. However, rare cases of liver injury have been reported after consumption of green tea infusions, most probably due to an idiosyncratic reaction. Based on the available data on the potential adverse effects of green tea catechins on the liver, the Panel concluded that there is evidence from interventional clinical trials that intake of doses equal or above 800 mg EGCG/day taken as a food supplement has been shown to induce a statistically significant increase of serum transaminases in treated subjects compared to control.
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27
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Yang CS, Wang H, Sheridan ZP. Studies on prevention of obesity, metabolic syndrome, diabetes, cardiovascular diseases and cancer by tea. J Food Drug Anal 2017; 26:1-13. [PMID: 29389543 PMCID: PMC9332647 DOI: 10.1016/j.jfda.2017.10.010] [Citation(s) in RCA: 83] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 10/26/2017] [Accepted: 10/31/2017] [Indexed: 12/16/2022] Open
Abstract
Tea, a popular beverage made from leaves of the plant Camellia sinensis, has been studied extensively in recent decades for its beneficial health effects in the prevention of obesity, metabolic syndrome, diabetes, cancer, and other diseases. Whereas these beneficial effects have been convincingly demonstrated in most laboratory studies, results from human studies have not been consistent. Some studies demonstrated that weight reduction, alleviation of metabolic syndrome and risk reduction in diabetes were only observed in individuals who consume 3-4 cups of tea (600-900 mg tea catechins) or more daily. This chapter reviews some of these studies, the possible mechanisms of actions of tea constituents, and the challenges in extrapolating laboratory studies to human situations.
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Affiliation(s)
- Chung Shu Yang
- Corresponding author. Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, 164 Frelinghuysen Road, Piscataway, NJ 08854-8020, USA. Fax: +1 732 445 0687. E-mail address: (C.S. Yang)
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28
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James KD, Kennett MJ, Lambert JD. Potential role of the mitochondria as a target for the hepatotoxic effects of (-)-epigallocatechin-3-gallate in mice. Food Chem Toxicol 2017; 111:302-309. [PMID: 29175576 DOI: 10.1016/j.fct.2017.11.029] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Revised: 11/16/2017] [Accepted: 11/19/2017] [Indexed: 11/29/2022]
Abstract
Green tea and (-)-epigallocatechin-3-gallate (EGCG) have been studied for their obesity-related health effects. Many green tea extract (GTE)-based dietary supplements are commercially-available. Although green tea beverage has a long history of safe use, a growing number of case-reports have linked GTE-based supplements to incidents of hepatotoxicity. Animal studies support the hepatotoxic potential of GTE and EGCG, but the mechanisms remain unclear. Here, we examined the hepatotoxic effects of EGCG in C57BL/6J mice and evaluated changes in hepatic antioxidant response and mitochondria structure and function. Intragastric dosing with EGCG (500 - 750 mg/kg) once daily for 3 d caused hepatic inflammation, necrosis, and hemorrhage. Hepatotoxicity was associated with increased oxidative stress and decreased superoxide dismutase and glutathione peroxidase levels. Real-time PCR and transmission electron microscopy showed decreased hepatic mitochondria copy number in EGCG-treated mice. The mRNA levels of marker genes of respiratory complex I and III, sirtuin 3, forkhead box O3a, and peroxisome-EGCG-treated mice. Sirtuin 3 protein levels were also decreased by EGCG. Our data indicate the mitochondria may be a target for EGCG, and that inhibition of mitochondria function/antioxidant response may be important for the hepatotoxicity of bolus EGCG.
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Affiliation(s)
- Karma D James
- Department of Food Science, The Pennsylvania State University, University Park, PA 16802, United States
| | - Mary J Kennett
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA 16802, United States
| | - Joshua D Lambert
- Department of Food Science, The Pennsylvania State University, University Park, PA 16802, United States; Center for Molecular Toxicology and Carcinogenesis, The Pennsylvania State University, University Park, PA 16802, United States.
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29
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Safety assessment of green tea based beverages and dried green tea extracts as nutritional supplements. Toxicol Lett 2017; 277:104-108. [PMID: 28655517 DOI: 10.1016/j.toxlet.2017.06.008] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 06/14/2017] [Accepted: 06/21/2017] [Indexed: 11/24/2022]
Abstract
The safety of green tea infusions and green tea extract (GTE)-based products is reviewed regarding catechins. Epigallocatechin 3-gallate (EGCG), the major catechin present in green tea, is suspected of being responsible for liver toxicity reported in humans consuming food supplements. Intake of EGCG with green tea infusions and GTE-based beverages is up to about 450mg EGCG/person/day in Europe and higher in Asia. Consumption of green tea is not associated with liver damage in humans, and green tea infusion and GTE-based beverages are considered safe in the range of historical uses. In animal studies, EGCG's potency for liver effects is highly dependent on conditions of administration. Use of NOAELs from bolus administration to derive a tolerable upper intake level applying the margin of safety concept results in acceptable EGCG-doses lower than those from one cup of green tea. NOAELs from toxicity studies applying EGCG with diet/split of the daily dose are a better point of departure for risk characterization. In clinical intervention studies, liver effects were not observed after intakes below 600mg EGCG/person/day. Thus, a tolerable upper intake level of 300mg EGCG/person/day is proposed for food supplements; this gives a twofold safety margin to clinical studies that did not report liver effects and a margin of safety of 100 to the NOAELs in animal studies with dietary administration of green tea catechins.
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30
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ErbB Proteins as Molecular Target of Dietary Phytochemicals in Malignant Diseases. JOURNAL OF ONCOLOGY 2017; 2017:1532534. [PMID: 28286519 PMCID: PMC5327764 DOI: 10.1155/2017/1532534] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 12/30/2016] [Accepted: 01/17/2017] [Indexed: 12/16/2022]
Abstract
ErbB proteins overexpression, in both normal and mutated forms, is associated with invasive forms of cancer prone to metastasis and with stronger antiapoptotic mechanisms and therefore more challenging to treat. Downstream effectors of ErbB receptors mediating these phenotypic traits include MAPK, STAT, and PI3K/AKT/mTOR pathways. Various phytochemical compounds were studied for their large number of biological effects including anticancer activity. Among these compounds, epigallocatechin-3-gallate (EGCG), the main catechin from green tea leaves, and curcumin, component of the curry powder, constituted the object of numerous studies. Both compounds were shown to act directly either on ErbB expression, or on their downstream signaling molecules. In this paper we aim to review the involvement of ErbB proteins in cancer as well as the biologic activity of EGCG and curcumin in ErbB expressing and overexpressing malignancies. The problems arising in the administration of the two compounds due to their reduced bioavailability when orally administered, as well as the progress made in this field, from using novel formulations to improved dosing regimens or improved synthetic analogs, are also discussed.
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31
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Redan BW, Chegeni M, Ferruzzi MG. Differentiated Caco-2 cell monolayers exhibit adaptation in the transport and metabolism of flavan-3-ols with chronic exposure to both isolated flavan-3-ols and enriched extracts. Food Funct 2017; 8:111-121. [PMID: 27808339 DOI: 10.1039/c6fo01289b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Chronic exposure to commonly consumed flavonoids changes their transport and metabolism in a small intestinal cell model.
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Affiliation(s)
| | | | - Mario G. Ferruzzi
- Department of Nutrition Science
- Purdue University
- West Lafayette
- USA
- Department of Food Science
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32
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Aloui F, Charradi K, Hichami A, Subramaniam S, Khan NA, Limam F, Aouani E. Grape seed and skin extract reduces pancreas lipotoxicity, oxidative stress and inflammation in high fat diet fed rats. Biomed Pharmacother 2016; 84:2020-2028. [DOI: 10.1016/j.biopha.2016.11.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 10/18/2016] [Accepted: 11/03/2016] [Indexed: 01/26/2023] Open
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Dong R, Wang D, Wang X, Zhang K, Chen P, Yang CS, Zhang J. Epigallocatechin-3-gallate enhances key enzymatic activities of hepatic thioredoxin and glutathione systems in selenium-optimal mice but activates hepatic Nrf2 responses in selenium-deficient mice. Redox Biol 2016; 10:221-232. [PMID: 27810737 PMCID: PMC5094413 DOI: 10.1016/j.redox.2016.10.009] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2016] [Revised: 10/16/2016] [Accepted: 10/21/2016] [Indexed: 12/20/2022] Open
Abstract
Selenium participates in the antioxidant defense mainly through a class of selenoproteins, including thioredoxin reductase. Epigallocatechin-3-gallate (EGCG) is the most abundant and biologically active catechin in green tea. Depending upon the dose and biological systems, EGCG may function either as an antioxidant or as an inducer of antioxidant defense via its pro-oxidant action or other unidentified mechanisms. By manipulating the selenium status, the present study investigated the interactions of EGCG with antioxidant defense systems including the thioredoxin system comprising of thioredoxin and thioredoxin reductase, the glutathione system comprising of glutathione and glutathione reductase coupled with glutaredoxin, and the Nrf2 system. In selenium-optimal mice, EGCG increased hepatic activities of thioredoxin reductase, glutathione reductase and glutaredoxin. These effects of EGCG appeared to be not due to overt pro-oxidant action because melatonin, a powerful antioxidant, did not influence the increase. However, in selenium-deficient mice, with low basal levels of thioredoxin reductase 1, the same dose of EGCG did not elevate the above-mentioned enzymes; intriguingly EGCG in turn activated hepatic Nrf2 response, leading to increased heme oxygenase 1 and NAD(P)H:quinone oxidoreductase 1 protein levels and thioredoxin activity. Overall, the present work reveals that EGCG is a robust inducer of the Nrf2 system only in selenium-deficient conditions. Under normal physiological conditions, in selenium-optimal mice, thioredoxin and glutathione systems serve as the first line defense systems against the stress induced by high doses of EGCG, sparing the activation of the Nrf2 system. EGCG increases hepatic activities of TrxR, GR and Grx in selenium-optimal mice. EGCG fails to manipulate the above-mentioned enzymes in selenium-deficient mice. EGCG in turn activates hepatic Nrf2 response in selenium-deficient mice. Selenium deficiency does not increase EGCG toxicity due to potent Nrf2 response.
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Affiliation(s)
- Ruixia Dong
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, Anhui, China; Department of Forestry and Technology, Lishui Vocational and Technical College, Lishui, Zhejiang, China
| | - Dongxu Wang
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, Anhui, China; International Joint Research Laboratory of Tea Chemistry and Health Effects, Anhui Agricultural University, Hefei, Anhui, China
| | - Xiaoxiao Wang
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, Anhui, China
| | - Ke Zhang
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, Anhui, China
| | - Pingping Chen
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, Anhui, China
| | - Chung S Yang
- Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, Piscataway, NJ, USA; International Joint Research Laboratory of Tea Chemistry and Health Effects, Anhui Agricultural University, Hefei, Anhui, China
| | - Jinsong Zhang
- State Key Laboratory of Tea Plant Biology and Utilization, School of Tea & Food Science, Anhui Agricultural University, Hefei, Anhui, China; International Joint Research Laboratory of Tea Chemistry and Health Effects, Anhui Agricultural University, Hefei, Anhui, China.
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34
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Bitzer ZT, Elias RJ, Vijay-Kumar M, Lambert JD. (-)-Epigallocatechin-3-gallate decreases colonic inflammation and permeability in a mouse model of colitis, but reduces macronutrient digestion and exacerbates weight loss. Mol Nutr Food Res 2016; 60:2267-2274. [PMID: 27218415 DOI: 10.1002/mnfr.201501042] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Revised: 04/22/2016] [Accepted: 04/26/2016] [Indexed: 02/06/2023]
Abstract
SCOPE (-)-Epigallocatechin-3-gallate (EGCG) has been reported to have putative health effects including the prevention of inflammation and obesity. Historically, polyphenols have been regarded as antinutritionals and while such effects may be beneficial in obese subjects, they may be deleterious in nutritionally compromised individuals. METHODS AND RESULTS We examined the effect of EGCG in the dextran sulfate sodium (DSS)-treated mouse model of ulcerative colitis. Following induction of colitis, mice were treated with EGCG (3.2 mg/g) as the sole source of drinking fluid for 3 days. EGCG treatment mitigated DSS-induced colon shortening and spleen enlargement. EGCG also decreased colonic protein levels of IL-1β, IL-6, and tumor necrosis factor-α, as well as colonic lipid peroxides compared to DSS-treated controls. We observed that EGCG reduced DSS-induced gastrointestinal permeability. These beneficial effects were offset by enhanced body weight loss in EGCG-treated mice compared to DSS-treated controls. These effects were related to decreased protein and lipid digestion in EGCG-treated mice compared to DSS-treated controls. CONCLUSIONS Our results suggest that although EGCG may exert anti-inflammatory effects, its ability to modulate macronutrient digestion may represent a dose-limiting adverse effect that must be considered in the context of its use for treating inflammatory bowel disease.
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Affiliation(s)
- Zachary T Bitzer
- Department of Food Science, The Pennsylvania State University, University Park, PA, USA
| | - Ryan J Elias
- Department of Food Science, The Pennsylvania State University, University Park, PA, USA
| | - Matam Vijay-Kumar
- Department of Nutritional Sciences, The Pennsylvania State University, University Park, PA, USA
| | - Joshua D Lambert
- Department of Food Science, The Pennsylvania State University, University Park, PA, USA. .,Center for Molecular Toxicology and Carcinogenesis, The Pennsylvania State University, University Park, PA, USA.
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Yang CS, Zhang J, Zhang L, Huang J, Wang Y. Mechanisms of body weight reduction and metabolic syndrome alleviation by tea. Mol Nutr Food Res 2015; 60:160-74. [PMID: 26577614 DOI: 10.1002/mnfr.201500428] [Citation(s) in RCA: 223] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 09/09/2015] [Accepted: 11/06/2015] [Indexed: 12/13/2022]
Abstract
Tea, a popular beverage made from leaves of the plant Camellia sinensis, has been shown to reduce body weight, alleviate metabolic syndrome, and prevent diabetes and cardiovascular diseases in animal models and humans. Such beneficial effects have generally been observed in most human studies when the level of tea consumption was three to four cups (600-900 mg tea catechins) or more per day. Green tea is more effective than black tea. In spite of numerous studies, the fundamental mechanisms for these actions still remain unclear. From a review of the literature, we propose that the two major mechanisms are: (i) decreasing absorption of lipids and proteins by tea constituents in the intestine, thus reducing calorie intake; and (ii) activating AMP-activated protein kinase by tea polyphenols that are bioavailable in the liver, skeletal muscle, and adipose tissues. The relative importance of these two mechanisms depends on the types of tea and diet consumed by individuals. The activated AMP-activated protein kinase would decrease gluconeogenesis and fatty acid synthesis and increase catabolism, leading to body weight reduction and metabolic syndrome alleviation. Other mechanisms and the health relevance of these beneficial effects of tea consumption remain to be further investigated.
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Affiliation(s)
- Chung S Yang
- Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, Piscataway, NJ, USA.,International Joint Research Laboratory of Tea Chemistry and Health Effects, Anhui Agricultural University, Hefei, Anhui, P. R. China
| | - Jinsong Zhang
- International Joint Research Laboratory of Tea Chemistry and Health Effects, Anhui Agricultural University, Hefei, Anhui, P. R. China.,State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei, Anhui, P. R. China
| | - Le Zhang
- Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, Piscataway, NJ, USA.,International Joint Research Laboratory of Tea Chemistry and Health Effects, Anhui Agricultural University, Hefei, Anhui, P. R. China
| | - Jinbao Huang
- International Joint Research Laboratory of Tea Chemistry and Health Effects, Anhui Agricultural University, Hefei, Anhui, P. R. China.,State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei, Anhui, P. R. China
| | - Yijun Wang
- International Joint Research Laboratory of Tea Chemistry and Health Effects, Anhui Agricultural University, Hefei, Anhui, P. R. China.,State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei, Anhui, P. R. China
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Domitrović R, Potočnjak I. A comprehensive overview of hepatoprotective natural compounds: mechanism of action and clinical perspectives. Arch Toxicol 2015; 90:39-79. [DOI: 10.1007/s00204-015-1580-z] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Accepted: 08/11/2015] [Indexed: 12/22/2022]
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Jia W, Chu X, Chang J, Zhang F. High-throughput screening of vitamins and natural antioxidants in nutraceuticals from green tea extracts by liquid chromatography coupled to quadrupole orbitrap mass spectrometry. J Chromatogr A 2015; 1406:337-41. [DOI: 10.1016/j.chroma.2015.06.050] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2015] [Revised: 05/26/2015] [Accepted: 06/18/2015] [Indexed: 11/29/2022]
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Dostal AM, Samavat H, Bedell S, Torkelson C, Wang R, Swenson K, Le C, Wu AH, Ursin G, Yuan JM, Kurzer MS. The safety of green tea extract supplementation in postmenopausal women at risk for breast cancer: results of the Minnesota Green Tea Trial. Food Chem Toxicol 2015; 83:26-35. [PMID: 26051348 DOI: 10.1016/j.fct.2015.05.019] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2015] [Revised: 04/29/2015] [Accepted: 05/26/2015] [Indexed: 02/07/2023]
Abstract
Green tea is thought to provide health benefits, though adverse reactions to green tea extract (GTE) have been reported. We conducted a randomized, double-blind, placebo-controlled study of GTE on breast cancer biomarkers, including mammographic density, in which 1075 postmenopausal women were randomly assigned to consume GTE containing 843 mg (-)-epigallocatechin-3-gallate (EGCG) or placebo daily for one year. There were no significant differences in % of women with adverse events (AEs, 75.6% and 72.8% of the GTE group and placebo group, respectively) or serious AEs (2.2 % and 1.5% of GTE and placebo groups, respectively). Women on GTE reported significantly higher incidence of nausea (P < 0.001) and dermatologic AEs (P = 0.05) and significantly lower diarrhea incidence (P = 0.02). More women in the GTE group experienced an alanine aminotransferase (ALT) elevation compared with placebo group (n = 36, (6.7%) vs. n = 4, (0.7%); P < 0.001). There were no statistically significant differences between groups in frequencies of other AEs. Overall, AEs were mainly mild and transient, indicating that daily consumption of GTE containing 843 mg EGCG is generally well tolerated by a group of predominantly Caucasian postmenopausal women. However, 6.7% of GTE consumers experienced ALT elevations, with 1.3% experiencing ALT-related serious AEs.
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Affiliation(s)
- Allison M Dostal
- Department of Food Science and Nutrition, University of Minnesota, 1334 Eckles Ave., St. Paul, MN 55108, USA.
| | - Hamed Samavat
- Department of Food Science and Nutrition, University of Minnesota, 1334 Eckles Ave., St. Paul, MN 55108, USA.
| | - Sarah Bedell
- Department of Food Science and Nutrition, University of Minnesota, 1334 Eckles Ave., St. Paul, MN 55108, USA.
| | - Carolyn Torkelson
- Department of Family Medicine, University of Minnesota Medical Center, 420 Delaware St. SE, Minneapolis, MN 55455, USA.
| | - Renwei Wang
- University of Pittsburgh Cancer Institute, Division of Cancer Control and Population Sciences, University of Pittsburgh Graduate School of Public Health, Department of Epidemiology, 5150 Centre Ave., Pittsburgh, PA 15232, USA.
| | - Karen Swenson
- Virginia Piper Cancer Institute, Allina Health System, 800 East 28th St., Suite 602, Minneapolis, MN 55407, USA.
| | - Chap Le
- Biostatistics and Informatics Core, Masonic Cancer Center, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Anna H Wu
- Department of Preventive Medicine, University of Southern California Keck School of Medicine, 1975 Zonal Ave., Los Angeles, CA 90033, USA.
| | - Giske Ursin
- Department of Preventive Medicine, University of Southern California Keck School of Medicine, 1975 Zonal Ave., Los Angeles, CA 90033, USA; Cancer Registry of Norway, Oslo, Norway; Department of Nutrition, University of Oslo, Oslo, Norway.
| | - Jian-Min Yuan
- University of Pittsburgh Cancer Institute, Division of Cancer Control and Population Sciences, University of Pittsburgh Graduate School of Public Health, Department of Epidemiology, 5150 Centre Ave., Pittsburgh, PA 15232, USA.
| | - Mindy S Kurzer
- Department of Food Science and Nutrition, University of Minnesota, 1334 Eckles Ave., St. Paul, MN 55108, USA.
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