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Balakrishnan R, Jannat K, Choi DK. Development of dietary small molecules as multi-targeting treatment strategies for Alzheimer's disease. Redox Biol 2024; 71:103105. [PMID: 38471283 PMCID: PMC10945280 DOI: 10.1016/j.redox.2024.103105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 02/15/2024] [Accepted: 02/24/2024] [Indexed: 03/14/2024] Open
Abstract
Cognitive dysfunction can occur both in normal aging and age-related neurological disorders, such as mild cognitive impairment and Alzheimer's disease (AD). These disorders have few treatment options due to side effects and limited efficacy. New approaches to slow cognitive decline are urgently needed. Dietary interventions (nutraceuticals) have received considerable attention because they exhibit strong neuroprotective properties and may help prevent or minimize AD symptoms. Biological aging is driven by a series of interrelated mechanisms, including oxidative stress, neuroinflammation, neuronal apoptosis, and autophagy, which function through various signaling pathways. Recent clinical and preclinical studies have shown that dietary small molecules derived from natural sources, including flavonoids, carotenoids, and polyphenolic acids, can modulate oxidative damage, cognitive impairments, mitochondrial dysfunction, neuroinflammation, neuronal apoptosis, autophagy dysregulation, and gut microbiota dysbiosis. This paper reviews research on different dietary small molecules and their bioactive constituents in the treatment of AD. Additionally, the chemical structure, effective dose, and specific molecular mechanisms of action are comprehensively explored. This paper also discusses the advantages of using nanotechnology-based drug delivery, which significantly enhances oral bioavailability, safety, and therapeutic effect, and lowers the risk of adverse effects. These agents have considerable potential as novel and safe therapeutic agents that can prevent and combat age-related AD.
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Affiliation(s)
- Rengasamy Balakrishnan
- Department of Applied Life Sciences, Graduate School, BK21 Program, Konkuk University, Chungju, 27478, South Korea; Department of Biotechnology, College of Biomedical and Health Science, Research Institute of Inflammatory Disease (RID), Konkuk University, Chungju, 27478, South Korea
| | - Khoshnur Jannat
- Department of Biotechnology, College of Biomedical and Health Science, Research Institute of Inflammatory Disease (RID), Konkuk University, Chungju, 27478, South Korea
| | - Dong-Kug Choi
- Department of Applied Life Sciences, Graduate School, BK21 Program, Konkuk University, Chungju, 27478, South Korea; Department of Biotechnology, College of Biomedical and Health Science, Research Institute of Inflammatory Disease (RID), Konkuk University, Chungju, 27478, South Korea.
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Sidhu D, Vasundhara M, Dey P. The intestinal-level metabolic benefits of green tea catechins: Mechanistic insights from pre-clinical and clinical studies. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2024; 123:155207. [PMID: 38000106 DOI: 10.1016/j.phymed.2023.155207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 10/11/2023] [Accepted: 11/08/2023] [Indexed: 11/26/2023]
Abstract
BACKGROUND The intestinal-level host-microbiota interaction has been implicated in the pathogenesis of chronic diseases. The current review is intended to provide a comprehensive insight into deciphering whether intestinal-level bioactivities mediate the overall metabolic health benefits of green tea catechins. PURPOSE We have comprehensively discussed pre-clinical and clinical evidences of intestinal-level changes in metabolism, microbiota, and metabolome due to catechin-rich green tea treatments, ultimately limiting metabolic diseases. Exclusive emphasis has been given to purified catechins and green tea, and discussions on extraintestinal mechanisms of metabolic health benefits were avoided. METHODS A literature search for relevant pre-clinical and clinical studies was performed in various online databases (e.g., PubMed) using specific keywords (e.g., catechin, intestine, microbiota). Out of all the referred literature, ∼15% belonged to 2021-2023, ∼51% were from 2011-2020, and ∼32% from 2000-2010. RESULT The metabolic health benefits of green tea catechins are indeed influenced by the intestinal-level bioactivities, including reduction of mucosal inflammation and oxidative stress, attenuation of gut barrier dysfunction, decrease in intestinal lipid absorption and metabolism, favorable modulation of mucosal nuclear receptor signaling, alterations of the luminal global metabolome, and mitigation of the gut dysbiosis. The results from the recent clinical studies support the pre-clinical evidences. The challenges and pitfalls of the currently available knowledge on catechin bioactivities have been discussed, and constructive directions to harness the translational benefits of green tea through future interventions have been provided. CONCLUSION The metabolism, metabolome, and microbiota at the intestinal epithelia play critical roles in catechin metabolism, pharmacokinetics, bioavailability, and bioactivities. Especially the reciprocal interaction between the catechins and the gut microbiota dictates the metabolic benefits of catechins.
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Affiliation(s)
- Dwinder Sidhu
- Department of Biotechnology, Thapar Institute of Engineering & Technology, Patiala 147004, India
| | - M Vasundhara
- Department of Biotechnology, Thapar Institute of Engineering & Technology, Patiala 147004, India.
| | - Priyankar Dey
- Department of Biotechnology, Thapar Institute of Engineering & Technology, Patiala 147004, India.
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Stannard H, Koszalka P, Deshpande N, Desjardins Y, Baz M. Pre-Clinical Evaluation of the Antiviral Activity of Epigalocatechin-3-Gallate, a Component of Green Tea, against Influenza A(H1N1)pdm Viruses. Viruses 2023; 15:2447. [PMID: 38140688 PMCID: PMC10747412 DOI: 10.3390/v15122447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 12/10/2023] [Accepted: 12/12/2023] [Indexed: 12/24/2023] Open
Abstract
Influenza antiviral drugs are important tools in our fight against both annual influenza epidemics and pandemics. Polyphenols are a group of compounds found in plants, some of which have demonstrated promising antiviral activity. Previous in vitro and mouse studies have outlined the anti-influenza virus effectiveness of the polyphenol epigallocatechin-3-gallate (EGCG); however, no study has utilised the ferret model, which is considered the gold-standard for influenza antiviral studies. This study aimed to explore the antiviral efficacy of EGCG in vitro and in ferrets. We first performed studies in Madin-Darby Canine Kidney (MDCK) and human lung carcinoma (Calu-3) cells, which demonstrated antiviral activity. In MDCK cells, we observed a selective index (SI, CC50/IC50) of 77 (290 µM/3.8 µM) and 96 (290 µM/3.0 µM) against A/California/07/2009 and A/Victoria/2570/2019 (H1N1)pdm09 influenza virus, respectively. Calu-3 cells demonstrated a SI of 16 (420 µM/26 µM) and 18 (420 µM/24 µM). Ferrets infected with A/California/07/2009 influenza virus and treated with EGCG (500 mg/kg/day for 4 days) had no change in respiratory tissue viral titres, in contrast to oseltamivir treatment, which significantly reduced viral load in the lungs of treated animals. Therefore, we demonstrated that although EGCG showed antiviral activity in vitro against influenza viruses, the drug failed to impair viral replication in the respiratory tract of ferrets.
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Affiliation(s)
- Harry Stannard
- WHO Collaborating Centre for Reference and Research on Influenza, at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC 3000, Australia; (H.S.)
| | - Paulina Koszalka
- WHO Collaborating Centre for Reference and Research on Influenza, at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC 3000, Australia; (H.S.)
| | - Nikita Deshpande
- WHO Collaborating Centre for Reference and Research on Influenza, at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC 3000, Australia; (H.S.)
| | - Yves Desjardins
- Institute of Nutrition and Functional Foods, Centre Nutrition, Santé et Societé (NUTRISS) Center, Faculté de Sciences de L’agriculture et de L’alimentation (FSAA), Université Laval, Quebec City, QC G1V 4L3, Canada
| | - Mariana Baz
- WHO Collaborating Centre for Reference and Research on Influenza, at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC 3000, Australia; (H.S.)
- Department of Microbiology and Immunology, at the Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, VIC 3000, Australia
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4
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Al-Awaida W, Goh KW, Al-Ameer HJ, Gushchina YS, Torshin VI, Severin AE, Al Bawareed O, Srour B, Al Farraj J, Hamad I. Assessing the Protective Role of Epigallocatechin Gallate (EGCG) against Water-Pipe Smoke-Induced Toxicity: A Comparative Study on Gene Expression and Histopathology. Molecules 2023; 28:7502. [PMID: 38005223 PMCID: PMC10673035 DOI: 10.3390/molecules28227502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 11/04/2023] [Accepted: 11/05/2023] [Indexed: 11/26/2023] Open
Abstract
Exposure to water-pipe smoking, whether flavored or unflavored, has been shown to instigate inflammation and oxidative stress in BALB/c mice. This consequently results in alterations in the expression of inflammatory markers and antioxidant genes. This study aimed to scrutinize the impact of Epigallocatechin gallate (EGCG)-a key active component of green tea-on inflammation and oxidative stress in BALB/c mice exposed to water-pipe smoke. The experimental setup included a control group, a flavored water-pipe smoke (FWP) group, an unflavored water-pipe smoke (UFWP) group, and EGCG-treated flavored and unflavored groups (FWP + EGCG and UFWP + EGCG). Expression levels of IL-6, IL1B, TNF-α, CAT, GPXI, MT-I, MT-II, SOD-I, SOD-II, and SOD-III were evaluated in lung, liver, and kidney tissues. Histopathological changes were also assessed. The findings revealed that the EGCG-treated groups manifested a significant decline in the expression of inflammatory markers and antioxidant genes compared to the FWP and UFWP groups. This insinuates that EGCG holds the capacity to alleviate the damaging effects of water-pipe smoke-induced inflammation and oxidative stress. Moreover, enhancements in histopathological features were observed in the EGCG-treated groups, signifying a protective effect against tissue damage induced by water-pipe smoking. These results underscore the potential of EGCG as a protective agent against the adverse effects of water-pipe smoking. By curbing inflammation and oxidative stress, EGCG may aid in the prevention or mitigation of smoking-associated diseases.
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Affiliation(s)
- Wajdy Al-Awaida
- Department of Biology and Biotechnology, American University of Madaba, Madaba 11821, Jordan; (B.S.); (J.A.F.)
| | - Khang Wen Goh
- Faculty of Data Science and Information Technology, INTI International University, Nilai 71800, Malaysia;
| | - Hamzeh J. Al-Ameer
- Department of Biotechnology, Faculty of Allied Medical Sciences, Al-Ahliyya Amman University (AAU), Amman 19328, Jordan;
| | - Yulia Sh. Gushchina
- Department of General and Clinical Pharmacology, Medical Institute, Peoples’ Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya Street, 117198 Moscow, Russia;
| | - Vladimir I. Torshin
- Department of Normal Physiology, Medical Institute, Peoples’ Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya Street, 117198 Moscow, Russia; (V.I.T.); (A.E.S.); (O.A.B.)
| | - Alexandr E. Severin
- Department of Normal Physiology, Medical Institute, Peoples’ Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya Street, 117198 Moscow, Russia; (V.I.T.); (A.E.S.); (O.A.B.)
| | - Omar Al Bawareed
- Department of Normal Physiology, Medical Institute, Peoples’ Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya Street, 117198 Moscow, Russia; (V.I.T.); (A.E.S.); (O.A.B.)
| | - Besan Srour
- Department of Biology and Biotechnology, American University of Madaba, Madaba 11821, Jordan; (B.S.); (J.A.F.)
| | - Jude Al Farraj
- Department of Biology and Biotechnology, American University of Madaba, Madaba 11821, Jordan; (B.S.); (J.A.F.)
| | - Islam Hamad
- Department of Pharmacy, Faculty of Health Sciences, American University of Madaba, Madaba 11821, Jordan;
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5
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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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6
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Cladis DP, Weaver CM, Ferruzzi MG. (Poly)phenol toxicity in vivo following oral administration: A targeted narrative review of (poly)phenols from green tea, grape, and anthocyanin-rich extracts. Phytother Res 2021; 36:323-335. [PMID: 34725890 DOI: 10.1002/ptr.7323] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 10/17/2021] [Accepted: 10/18/2021] [Indexed: 12/20/2022]
Abstract
Fruit- and vegetable-derived (poly)phenols are secondary plant metabolites that may have beneficial effects on human health when consumed regularly. Recent years have seen rapid growth in both consumer demand for and research interest in (poly)phenol-rich dietary supplements, natural colorants, and functional foods. As these products continue to enter the marketplace and (poly)phenol intake patterns change from traditional food products to these sources, attention must be paid to the potential for toxicity from consuming elevated doses of (poly)phenols. To date, much remains unknown regarding the safety of high doses of (poly)phenols, especially in vivo. In this targeted narrative review, we summarize evidence from in vivo investigations of (poly)phenol toxicity after oral administration of green tea extracts, grape-derived phenolics, and anthocyanin-rich extracts. There is limited evidence of overt toxicity from oral ingestion of these (poly)phenol-rich sources, though more research on the safety of high doses-as well as defining what constitutes a "high" dose of both individual and complex mixtures of (poly)phenols-is needed before these observations can be used to create dietary guidance for consumers.
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Affiliation(s)
- Dennis P Cladis
- Department of Food Science and Nutrition, University of Minnesota, St. Paul, Minnesota, USA
| | - Connie M Weaver
- Department of Food Science, Purdue University, Lafayette, Indiana, USA
| | - Mario G Ferruzzi
- Plants for Human Health Institute, North Carolina State University, Kannapolis, North Carolina, USA
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Ravindran Menon D, Li Y, Yamauchi T, Osborne DG, Vaddi PK, Wempe MF, Zhai Z, Fujita M. EGCG Inhibits Tumor Growth in Melanoma by Targeting JAK-STAT Signaling and Its Downstream PD-L1/PD-L2-PD1 Axis in Tumors and Enhancing Cytotoxic T-Cell Responses. Pharmaceuticals (Basel) 2021; 14:1081. [PMID: 34832863 PMCID: PMC8618268 DOI: 10.3390/ph14111081] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 10/19/2021] [Accepted: 10/21/2021] [Indexed: 12/13/2022] Open
Abstract
Over the last decade, therapies targeting immune checkpoints, such as programmed death-1 (PD-1), have revolutionized the field of cancer immunotherapy. However, low response rates and immune-related adverse events remain a major concern. Here, we report that epigallocatechin gallate (EGCG), the most abundant catechin in green tea, inhibits melanoma growth by modulating an immune response against tumors. In vitro experiments revealed that EGCG treatment inhibited interferon-gamma (IFN-γ)-induced PD-L1 and PD-L2 expression and JAK-STAT signaling. We confirmed that this effect was driven by inhibiting STAT1 gene expression and STAT1 phosphorylation, thereby downregulating the PD-L1/PD-L2 transcriptional regulator IRF1 in both human and mouse melanoma cells. Animal studies revealed that the in vivo tumor-inhibitory effect of EGCG was through CD8+ T cells and that the inhibitory effect of EGCG was comparable to anti-PD-1 therapy. However, their mechanisms of action were different. Dissimilar to anti-PD-1 treatment that blocks PD-1/PD-L1 interaction, EGCG inhibited JAK/STAT signaling and PD-L1 expression in tumor cells, leading to the re-activation of T cells. In summary, we demonstrate that EGCG enhances anti-tumor immune responses by inhibiting JAK-STAT signaling in melanoma. EGCG could be used as an alternative treatment strategy to target the PD-L1/PD-L2-PD-1 axis in cancers.
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Affiliation(s)
- Dinoop Ravindran Menon
- Department of Dermatology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; (D.R.M.); (Y.L.); (T.Y.); (D.G.O.); (P.K.V.); (Z.Z.)
| | - Yang Li
- Department of Dermatology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; (D.R.M.); (Y.L.); (T.Y.); (D.G.O.); (P.K.V.); (Z.Z.)
| | - Takeshi Yamauchi
- Department of Dermatology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; (D.R.M.); (Y.L.); (T.Y.); (D.G.O.); (P.K.V.); (Z.Z.)
| | - Douglas Grant Osborne
- Department of Dermatology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; (D.R.M.); (Y.L.); (T.Y.); (D.G.O.); (P.K.V.); (Z.Z.)
| | - Prasanna Kumar Vaddi
- Department of Dermatology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; (D.R.M.); (Y.L.); (T.Y.); (D.G.O.); (P.K.V.); (Z.Z.)
| | - Michael F Wempe
- Department of Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA;
| | - Zili Zhai
- Department of Dermatology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; (D.R.M.); (Y.L.); (T.Y.); (D.G.O.); (P.K.V.); (Z.Z.)
| | - Mayumi Fujita
- Department of Dermatology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; (D.R.M.); (Y.L.); (T.Y.); (D.G.O.); (P.K.V.); (Z.Z.)
- Department of Veterans Affairs Medical Center, VA Eastern Colorado Health Care System, Aurora, CO 80045, USA
- Department of Immunology & Microbiology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
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Ibrahim R, Nyska A, Dunnick J, Ramot Y. The toxicologic pathology aspects of selected natural herbal products and related compounds. J Toxicol Pathol 2021; 34:181-211. [PMID: 34290474 PMCID: PMC8280299 DOI: 10.1293/tox.2021-0016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 03/17/2021] [Indexed: 12/02/2022] Open
Abstract
Herbal products have been in use for many years, but they are becoming more and more
popular in recent years, and they are currently in widespread use throughout the world. In
this review article we describe the histopathologic findings found after exposure to 12
dietary herbals in studies conducted in rodent model systems. Clear or some evidence for
carcinogenic activity was seen with 6 herbals, with the liver being the most common organ
affected. The intestine was affected by two herbals (aloe vera nondecolorized extract and
senna), three had no clear evidence for carcinogenic activity and one was cardiotoxic
(Ephedrine and Ephedra in combination with caffeine). Information from these studies can
help to better understand potential target organs for further evaluation from exposure to
various herbal products.
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Affiliation(s)
- Ruba Ibrahim
- Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel.,Department of Dermatology, Hadassah Medical Center, Jerusalem, Israel
| | - Abraham Nyska
- Consultant in Toxicologic Pathology, Yehuda HaMaccabi 31, floor 5, Tel Aviv 6200515, Israel.,Tel Aviv University, Tel Aviv, Israel
| | - June Dunnick
- Toxicology Branch, Division of the National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, NC, USA
| | - Yuval Ramot
- Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel.,Department of Dermatology, Hadassah Medical Center, Jerusalem, Israel
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Cho T, Wang X, Yeung K, Cao Y, Uetrecht J. Liver Injury Caused by Green Tea Extract in PD-1 -/- Mice: An Impaired Immune Tolerance Model for Idiosyncratic Drug-Induced Liver Injury. Chem Res Toxicol 2021; 34:849-856. [PMID: 33617238 DOI: 10.1021/acs.chemrestox.0c00485] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Idiosyncratic drug-induced liver injury (IDILI) is an idiosyncratic drug reaction that is specific to an individual and can lead to liver failure and even death. The mechanism of IDILI remains poorly understood, but most IDILI appears to be immune-mediated. We have developed the first validated animal model by using a PD-1-/- mouse model in combination with anti-CTLA-4 to block immune checkpoints and impair immune tolerance. Treatment of these mice with drugs that cause IDILI in humans led to delayed-onset liver injury with characteristics similar to IDILI in humans. The current study investigates the effects of green tea extract, a weight-loss dietary supplement that has been reported to cause IDILI in humans. Green tea extracts contain a highly variable content of catechins including (-)-epigallocatechin gallate, the major catechin in green tea formulations. If the liver injury caused by green tea extract in humans is immune-mediated, it may occur in our impaired immune tolerance model. Female PD-1-/- mice treated with anti-CTLA-4 antibody and green tea extract (500 mg/kg), a dose that is considered a no-observed-adverse-effect level for liver in rodents, produced a delayed onset increase in serum alanine transaminase levels and an increase in hepatic CD8+ T cells. In contrast, the response in male PD-1-/- mice was less pronounced, and there was no evidence of liver injury in wild-type mice. These findings are consistent with the hypothesis that the IDILI caused by green tea extract is immune-mediated and is similar to IDILI caused by medications that are associated with IDILI.
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Affiliation(s)
- Tiffany Cho
- Leslie Dan Faculty of Pharmacy, Department of Pharmaceutical Sciences, University of Toronto, Toronto, Ontario M5S 3M2, Canada
| | - Xijin Wang
- Leslie Dan Faculty of Pharmacy, Department of Pharmaceutical Sciences, University of Toronto, Toronto, Ontario M5S 3M2, Canada
| | - Karen Yeung
- Temerty Faculty of Medicine, Department of Immunology, University of Toronto, Toronto, Ontario M5S 3M2, Canada
| | - Yanshan Cao
- Leslie Dan Faculty of Pharmacy, Department of Pharmaceutical Sciences, University of Toronto, Toronto, Ontario M5S 3M2, Canada
| | - Jack Uetrecht
- Leslie Dan Faculty of Pharmacy, Department of Pharmaceutical Sciences, University of Toronto, Toronto, Ontario M5S 3M2, Canada
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10
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Griñan-Lison C, Blaya-Cánovas JL, López-Tejada A, Ávalos-Moreno M, Navarro-Ocón A, Cara FE, González-González A, Lorente JA, Marchal JA, Granados-Principal S. Antioxidants for the Treatment of Breast Cancer: Are We There Yet? Antioxidants (Basel) 2021; 10:antiox10020205. [PMID: 33572626 PMCID: PMC7911462 DOI: 10.3390/antiox10020205] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 01/27/2021] [Accepted: 01/28/2021] [Indexed: 12/15/2022] Open
Abstract
Breast cancer is the most frequent cancer and the leading cause of cancer death in women. Oxidative stress and the generation of reactive oxygen species (ROS) have been related to cancer progression. Compared to their normal counterparts, tumor cells show higher ROS levels and tight regulation of REDOX homeostasis to maintain a low degree of oxidative stress. Traditionally antioxidants have been extensively investigated to counteract breast carcinogenesis and tumor progression as chemopreventive agents; however, there is growing evidence indicating their potential as adjuvants for the treatment of breast cancer. Aimed to elucidate whether antioxidants could be a reality in the management of breast cancer patients, this review focuses on the latest investigations regarding the ambivalent role of antioxidants in the development of breast cancer, with special attention to the results derived from clinical trials, as well as their potential use as plausible agents in combination therapy and their power to ameliorate the side effects attributed to standard therapeutics. Data retrieved herein suggest that antioxidants play an important role in breast cancer prevention and the improvement of therapeutic efficacy; nevertheless, appropriate patient stratification based on “redoxidomics” or tumor subtype is mandatory in order to define the dosage for future standardized and personalized treatments of patients.
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Affiliation(s)
- Carmen Griñan-Lison
- Centre for Biomedical Research (CIBM), Biopathology and Regenerative Medicine Institute (IBIMER), University of Granada, 18100 Granada, Spain; (C.G.-L.); (J.A.M.)
- Instituto de Investigación Biosanitaria Ibs.GRANADA, University Hospitals of Granada-University of Granada, 18100 Granada, Spain
- Excellence Research Unit “Modeling Nature” (MNat), University of Granada, 18100 Granada, Spain
- GENYO, Centre for Genomics and Oncological Research, Pfizer/University of Granada/Andalusian Regional Government, 18016 Granada, Spain; (J.L.B.-C.); (A.L.-T.); (M.Á.-M.); (A.N.-O.); (F.E.C.); (A.G.-G.); (J.A.L.)
| | - Jose L. Blaya-Cánovas
- GENYO, Centre for Genomics and Oncological Research, Pfizer/University of Granada/Andalusian Regional Government, 18016 Granada, Spain; (J.L.B.-C.); (A.L.-T.); (M.Á.-M.); (A.N.-O.); (F.E.C.); (A.G.-G.); (J.A.L.)
| | - Araceli López-Tejada
- GENYO, Centre for Genomics and Oncological Research, Pfizer/University of Granada/Andalusian Regional Government, 18016 Granada, Spain; (J.L.B.-C.); (A.L.-T.); (M.Á.-M.); (A.N.-O.); (F.E.C.); (A.G.-G.); (J.A.L.)
| | - Marta Ávalos-Moreno
- GENYO, Centre for Genomics and Oncological Research, Pfizer/University of Granada/Andalusian Regional Government, 18016 Granada, Spain; (J.L.B.-C.); (A.L.-T.); (M.Á.-M.); (A.N.-O.); (F.E.C.); (A.G.-G.); (J.A.L.)
| | - Alba Navarro-Ocón
- GENYO, Centre for Genomics and Oncological Research, Pfizer/University of Granada/Andalusian Regional Government, 18016 Granada, Spain; (J.L.B.-C.); (A.L.-T.); (M.Á.-M.); (A.N.-O.); (F.E.C.); (A.G.-G.); (J.A.L.)
| | - Francisca E. Cara
- GENYO, Centre for Genomics and Oncological Research, Pfizer/University of Granada/Andalusian Regional Government, 18016 Granada, Spain; (J.L.B.-C.); (A.L.-T.); (M.Á.-M.); (A.N.-O.); (F.E.C.); (A.G.-G.); (J.A.L.)
| | - Adrián González-González
- GENYO, Centre for Genomics and Oncological Research, Pfizer/University of Granada/Andalusian Regional Government, 18016 Granada, Spain; (J.L.B.-C.); (A.L.-T.); (M.Á.-M.); (A.N.-O.); (F.E.C.); (A.G.-G.); (J.A.L.)
| | - Jose A. Lorente
- GENYO, Centre for Genomics and Oncological Research, Pfizer/University of Granada/Andalusian Regional Government, 18016 Granada, Spain; (J.L.B.-C.); (A.L.-T.); (M.Á.-M.); (A.N.-O.); (F.E.C.); (A.G.-G.); (J.A.L.)
- Department of Legal Medicine, School of Medicine, University of Granada, 18016 Granada, Spain
| | - Juan A. Marchal
- Centre for Biomedical Research (CIBM), Biopathology and Regenerative Medicine Institute (IBIMER), University of Granada, 18100 Granada, Spain; (C.G.-L.); (J.A.M.)
- Instituto de Investigación Biosanitaria Ibs.GRANADA, University Hospitals of Granada-University of Granada, 18100 Granada, Spain
- Excellence Research Unit “Modeling Nature” (MNat), University of Granada, 18100 Granada, Spain
- Department of Human Anatomy and Embryology, School of Medicine, University of Granada, 18016 Granada, Spain
| | - Sergio Granados-Principal
- Instituto de Investigación Biosanitaria Ibs.GRANADA, University Hospitals of Granada-University of Granada, 18100 Granada, Spain
- GENYO, Centre for Genomics and Oncological Research, Pfizer/University of Granada/Andalusian Regional Government, 18016 Granada, Spain; (J.L.B.-C.); (A.L.-T.); (M.Á.-M.); (A.N.-O.); (F.E.C.); (A.G.-G.); (J.A.L.)
- Department of Biochemistry and Molecular Biology II, School of Pharmacy, University of Granada, 18011 Granada, Spain
- Correspondence: or ; Tel.: +34-651-55-79-21
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11
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Adipogenic commitment induced by green tea polyphenols remodel adipocytes to a thermogenic phenotype. J Nutr Biochem 2020; 83:108429. [DOI: 10.1016/j.jnutbio.2020.108429] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 03/26/2020] [Accepted: 03/30/2020] [Indexed: 12/18/2022]
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Malar DS, Prasanth MI, Brimson JM, Sharika R, Sivamaruthi BS, Chaiyasut C, Tencomnao T. Neuroprotective Properties of Green Tea ( Camellia sinensis) in Parkinson's Disease: A Review. Molecules 2020; 25:E3926. [PMID: 32867388 PMCID: PMC7504552 DOI: 10.3390/molecules25173926] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 08/14/2020] [Accepted: 08/14/2020] [Indexed: 12/21/2022] Open
Abstract
Neurodegenerative disease is a collective term given for the clinical condition, which results in progressive degeneration of neurons and the loss of functions associated with the affected brain region. Apart from the increase in age, neurodegenerative diseases are also partly affected by diet and lifestyle practices. Parkinson's disease (PD) is a slow onset neurodegenerative disorder and the second most common neurodegenerative disease, which affects the motor system. Although there is no prescribed treatment method to prevent and cure PD, clinical procedures help manage the disease symptoms. Green tea polyphenols are known for several health benefits, including antioxidant, anti-inflammatory, and neuroprotective activity. The current manuscript summarizes the possible mechanisms of neuroprotective potential of green tea with a special focus on PD. Studies have suggested that the consumption of green tea protects against free-radicals, inflammation, and neuro-damages. Several in vivo studies aid in understanding the overall mechanism of green tea. However, the same dose may not be sufficient in humans to elicit similar effects due to complex physiological, social, and cultural development. Future research focused on more clinical trials could identify an optimum dose that could impart maximum health benefits to impart neuroprotection in PD.
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Affiliation(s)
- Dicson Sheeja Malar
- Age-Related Inflammation and Degeneration Research Unit, Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand; (D.S.M.); (M.I.P.); (J.M.B.)
| | - Mani Iyer Prasanth
- Age-Related Inflammation and Degeneration Research Unit, Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand; (D.S.M.); (M.I.P.); (J.M.B.)
| | - James Michael Brimson
- Age-Related Inflammation and Degeneration Research Unit, Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand; (D.S.M.); (M.I.P.); (J.M.B.)
| | - Rajasekharan Sharika
- 309, Vrinda, 10th Cross, Railway Layout, Vijayanagar 2nd Stage, Mysuru, Karnataka 570016, India;
| | - Bhagavathi Sundaram Sivamaruthi
- Innovation Center for Holistic Health, Nutraceuticals and Cosmeceuticals, Faculty of Pharmacy, Chiang Mai University, Chiang Mai 50200, Thailand; (B.S.S.); (C.C.)
| | - Chaiyavat Chaiyasut
- Innovation Center for Holistic Health, Nutraceuticals and Cosmeceuticals, Faculty of Pharmacy, Chiang Mai University, Chiang Mai 50200, Thailand; (B.S.S.); (C.C.)
| | - Tewin Tencomnao
- Age-Related Inflammation and Degeneration Research Unit, Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok 10330, Thailand; (D.S.M.); (M.I.P.); (J.M.B.)
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13
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Rojo MÁ, Garrosa M, Jiménez P, Girbés T, Garcia-Recio V, Cordoba-Diaz M, Cordoba-Diaz D. Unexpected Toxicity of Green Tea Polyphenols in Combination with the Sambucus RIL Ebulin. Toxins (Basel) 2020; 12:E542. [PMID: 32842591 PMCID: PMC7551510 DOI: 10.3390/toxins12090542] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 08/12/2020] [Accepted: 08/20/2020] [Indexed: 11/17/2022] Open
Abstract
The safety of concentrated food complements intake is a major health concern. It has been well established that green tea polyphenols (GTPs) consumption promotes healthy effects. However, the ingestion of large amounts of GTPs is a matter of controversy due to reported adverse effects. We underwent a preliminary exploration of the effects of the oral administration of a standardized concentrated GTPs preparation on mice which suffered from reversible intestinal derangement promoted by sublethal amounts of the antiribosomal lectin ebulin f from dwarf elder (Sambucus ebulus L.). Neither independent oral administration of 30 mg/kg body weight Polyphenon 60 nor intraperitoneal administration of 2.5 mg/kg body weight ebulin f triggered lethal toxicity. In contrast, the simultaneous administration of these same doses of both Polyphenon 60 and ebulin f triggered an important and unexpected synergistic toxic action featured by the biphasic reduction of weight, which continued after eight days, reaching a reduction of 40%. Lethality appeared 2 days after the onset of the combined treatment and reached more than 50% after 10 days.
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Affiliation(s)
- M. Ángeles Rojo
- Area of Experimental Sciences, Miguel de Cervantes European University, 47012 Valladolid, Spain;
| | - Manuel Garrosa
- Area of Histology, Faculty of Medicine and INCYL, University of Valladolid, 47005 Valladolid, Spain;
| | - Pilar Jiménez
- Area of Nutrition and Food Sciences, Faculty of Medicine, University of Valladolid, 47005 Valladolid, Spain; (P.J.); (T.G.)
| | - Tomás Girbés
- Area of Nutrition and Food Sciences, Faculty of Medicine, University of Valladolid, 47005 Valladolid, Spain; (P.J.); (T.G.)
| | - Verónica Garcia-Recio
- Area of Pharmaceutics and Food Technology, Faculty of Pharmacy, Complutense University of Madrid, 28040 Madrid, Spain; (V.G.-R.); (M.C.-D.)
| | - Manuel Cordoba-Diaz
- Area of Pharmaceutics and Food Technology, Faculty of Pharmacy, Complutense University of Madrid, 28040 Madrid, Spain; (V.G.-R.); (M.C.-D.)
- University Institute of Industrial Pharmacy (IUFI), Complutense University of Madrid, 28040 Madrid, Spain
| | - Damián Cordoba-Diaz
- Area of Pharmaceutics and Food Technology, Faculty of Pharmacy, Complutense University of Madrid, 28040 Madrid, Spain; (V.G.-R.); (M.C.-D.)
- University Institute of Industrial Pharmacy (IUFI), Complutense University of Madrid, 28040 Madrid, Spain
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14
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Goodlett CR, Stringer M, LaCombe J, Patel R, Wallace JM, Roper RJ. Evaluation of the therapeutic potential of Epigallocatechin-3-gallate (EGCG) via oral gavage in young adult Down syndrome mice. Sci Rep 2020; 10:10426. [PMID: 32591597 PMCID: PMC7319987 DOI: 10.1038/s41598-020-67133-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Accepted: 05/29/2020] [Indexed: 01/09/2023] Open
Abstract
Epigallocatechin-3-gallate (EGCG) is a candidate therapeutic for Down syndrome (DS) phenotypes based on in vitro inhibition of DYRK1A, a triplicated gene product of Trisomy 21 (Ts21). Consumption of green tea extracts containing EGCG improved some cognitive and behavioral outcomes in DS mouse models and in humans with Ts21. In contrast, treatment with pure EGCG in DS mouse models did not improve neurobehavioral phenotypes. This study tested the hypothesis that 200 mg/kg/day of pure EGCG, given via oral gavage, would improve neurobehavioral and skeletal phenotypes in the Ts65Dn DS mouse model. Serum EGCG levels post-gavage were significantly higher in trisomic mice than in euploid mice. Daily EGCG gavage treatments over three weeks resulted in growth deficits in both euploid and trisomic mice. Compared to vehicle treatment, EGCG did not significantly improve behavioral performance of Ts65Dn mice in the multivariate concentric square field, balance beam, or Morris water maze tasks, but reduced swimming speed. Furthermore, EGCG resulted in reduced cortical bone structure and strength in Ts65Dn mice. These outcomes failed to support the therapeutic potential of EGCG, and the deleterious effects on growth and skeletal phenotypes underscore the need for caution in high-dose EGCG supplements as an intervention in DS.
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Affiliation(s)
- Charles R Goodlett
- IUPUI Department of Psychology, 402 North Blackford Street, LD 124, Indianapolis, IN, 46202-3275, USA
| | - Megan Stringer
- IUPUI Department of Psychology, 402 North Blackford Street, LD 124, Indianapolis, IN, 46202-3275, USA
| | - Jonathan LaCombe
- IUPUI Department of Biology, 723 West Michigan Street; SL 306, Indianapolis, IN, 46202-3275, USA
| | - Roshni Patel
- IUPUI Department of Biology, 723 West Michigan Street; SL 306, Indianapolis, IN, 46202-3275, USA
| | - Joseph M Wallace
- IUPUI Department of Biomedical Engineering, 723 West Michigan Street; SL 220B, Indianapolis, IN, 46202-3275, USA
| | - Randall J Roper
- IUPUI Department of Biology, 723 West Michigan Street; SL 306, Indianapolis, IN, 46202-3275, USA.
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15
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Cladis DP, Li S, Reddivari L, Cox A, Ferruzzi MG, Weaver CM. A 90 day oral toxicity study of blueberry polyphenols in ovariectomized sprague-dawley rats. Food Chem Toxicol 2020; 139:111254. [PMID: 32165232 DOI: 10.1016/j.fct.2020.111254] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 03/04/2020] [Accepted: 03/07/2020] [Indexed: 12/18/2022]
Abstract
Regular consumption of polyphenol-rich fruits and vegetables is associated with beneficial health outcomes. To increase polyphenol intakes, consumers are increasingly using herbal and botanical dietary supplements containing concentrated polyphenol extracts. However, the safety of this consumption modality has not been vetted. To address this, ovariectomized Sprague-Dawley (OVX-SD) rats were orally gavaged with purified blueberry polyphenols at 0-1000 mg total polyphenols/kg bw/d for 90d. No differences in behavior, body weight, or food consumption were observed. No tumors or macroscopic changes were observed, and histopathological analyses showed no differences among groups. Although several statistically significant differences between treatment and control groups were observed in urine (color and pH) and blood (monocyte count, total cholesterol, and chloride ion concentration) analyses, these parameters were within normal ranges and not considered biologically significant. Intestinal permeability assessed via FITC-dextran showed increased intestinal permeability in the highest dose, though no morphological differences were found throughout the gastrointestinal tract. Given the lack of other systemic changes, this finding is likely of minimal physiological importance. These results indicate a NOAEL for blueberry polyphenols in OVX-SD rats is ≥ 1000 mg total polyphenols/kg bw/d, which translates to a 70 kg human consuming ~10 g polyphenols. Keywords: Blueberry, Polyphenol, Sub-chronic toxicity.
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Affiliation(s)
- Dennis P Cladis
- Dept. of Food Science, Purdue University, 745 Agriculture Mall Dr, W Lafayette, IN, 47907, USA
| | - Shiyu Li
- Dept. of Food Science, Purdue University, 745 Agriculture Mall Dr, W Lafayette, IN, 47907, USA
| | - Lavanya Reddivari
- Dept. of Food Science, Purdue University, 745 Agriculture Mall Dr, W Lafayette, IN, 47907, USA
| | - Abigail Cox
- Dept. of Comparative Pathobiology, Purdue University, 625 Harrison St, W Lafayette, IN, 47907, USA
| | - Mario G Ferruzzi
- Plants for Human Health Institute, North Carolina State University, 600 Laureate Way, Kannapolis, NC, 28081, USA
| | - Connie M Weaver
- Dept. of Food Science, Purdue University, 745 Agriculture Mall Dr, W Lafayette, IN, 47907, USA.
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16
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Ferreira LT, de Sousa Filho CPB, Marinovic MP, Rodrigues AC, Otton R. Green tea polyphenols positively impact hepatic metabolism of adiponectin-knockout lean mice. J Funct Foods 2020. [DOI: 10.1016/j.jff.2019.103679] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
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17
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Acute and Subchronic Oral Toxicity of Fermented Green Tea with Aquilariae Lignum in Rodents. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2019; 2019:8721858. [PMID: 31662782 PMCID: PMC6754909 DOI: 10.1155/2019/8721858] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 07/28/2019] [Accepted: 08/23/2019] [Indexed: 12/19/2022]
Abstract
Green tea is generally considered safe, but there have been concerns regarding side effects relating to the main component, catechins, especially hepatotoxicities. We have previously shown beneficial effects of fermented green tea with Aquilariae Lignum (fGT) via an oral route in diabetic and obese models. Thus, the toxicological safety of fGT was assessed at limited oral doses for a rodent. Mice or rats of both genders were orally administered distilled water as a control and fGT at 2.0, 1.0, and 0.5 g/kg. There were no mortalities or gross abnormalities in the fGT groups for 2 weeks following the single oral dose in mice. No fGT-relevant abnormalities were found in postmortem and histopathological examinations, suggesting LD50 of fGT at more than 2.0 g/kg with no specific target organs. There were also no fGT-relevant mortalities or abnormal signs in the repeated oral dose for 13 weeks in rats. In the fGT groups, no body weight changes or daily metabolic changes were found, and hematological and serum biochemical ranges were normal. The postmortem and histopathological examinations revealed few fGT-related abnormalities in most of the organs including the liver, although slight lymphoid cell hyperplasia in the lymph node was observed in a few rats with fGT at 2.0 g/kg. This may be secondary to increased immune response to the highest dose because there were no histopathological lesions or organ weight changes. It suggests nontoxic safety of fGT at up to 2.0 g/kg, which provides useful information for clinical use.
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Mir TM, Ma G, Ali Z, Khan IA, Ashfaq MK. Effect of Raspberry Ketone on Normal, Obese and Health-Compromised Obese Mice: A Preliminary Study. J Diet Suppl 2019; 18:1-16. [PMID: 31603036 DOI: 10.1080/19390211.2019.1674996] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Raspberry ketone (RK)-an aromatic compound found mostly in red raspberries (Rubus idaeus) is widely used as an over the counter product for weight loss. The present study was conducted to determine adverse effects associated with RK in obese and health-compromised obese mice. Two sets of experiments were conducted on normal obese and health-compromised obese mice treated with RK for a duration of 10 days. Obese conditions were induced by feeding mice a high fat diet for 10 weeks, while the health compromised obese mouse model was developed by a single intraperitoneal injection of a nontoxic dose of lipopolysaccharide (LPS) (6 mg/kg) to obese mice. Results showed that RK (165, 330, and 500 mg/kg) under obese as well as health-compromised condition retarded the gain in body weights as compared to the control groups. RK at doses 330 and 500 mg/kg resulted in 67.6 and 50% mortality, respectively in normal obese mice and 70% mortality was observed in health-compromised obese mice treated with RK at 500 mg/kg. At higher doses deaths were observed earlier than those given lower doses of RK. Significant elevations in blood alanine transaminase (ALT) were also observed with RK treatment in obese mice. Blood glucose levels were significantly elevated in all groups of mice treated with RK. This study suggests that higher doses of RK may cause adverse effects in health compromised conditions. Under these conditions, prolonged use of RK, especially in high doses, may pose a health hazard.
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Affiliation(s)
- Tahir Maqbool Mir
- National Center for Natural Product Research, School of Pharmacy, University of Mississippi, University, MS, USA
| | - Guoyi Ma
- Drug Discovery Division, Southern Research, Birmingham, AL, UK
| | - Zulfiqar Ali
- National Center for Natural Product Research, School of Pharmacy, University of Mississippi, University, MS, USA
| | - Ikhlas A Khan
- National Center for Natural Product Research, School of Pharmacy, University of Mississippi, University, MS, USA
| | - Mohammad K Ashfaq
- National Center for Natural Product Research, School of Pharmacy, University of Mississippi, University, MS, USA
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Al-Awaida WJ, Zihlif MA, Al-Ameer HJ, Sharab A, Akash M, Aburubaiha ZA, Fattash IA, Imraish A, Ali KH. The effect of green tea consumption on the expression of antioxidant- and inflammation-related genes induced by nicotine. J Food Biochem 2019; 43:e12874. [PMID: 31353688 DOI: 10.1111/jfbc.12874] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 04/01/2019] [Accepted: 04/03/2019] [Indexed: 12/22/2022]
Abstract
The aim of this study is to investigate the protective effect of green tea (GT) against the toxicity of nicotine. BALB/c mice were divided into four groups. Group I received food and water intake ad libidium, Group II received GT solution at a dose of 1 ml/kg body weight orally twice a day via gastric gavage, Group III was injected intraperitoneally with nicotine (2.5 mg/kg) once per day for 4 weeks, and Group IV received both nicotine and GT; GT was introduced using gastric gavage 1 hr before and 1 hr after the nicotine injection. The administration of nicotine altered the cellular antioxidant defense system by inducing inflammation and damage in the tissues of liver, lungs, and kidneys. In addition, nicotine treatment significantly enhanced the expression antioxidant- and inflammation-related genes. There were significant improvements when the nicotine-exposed mice treated with GT. PRACTICAL APPLICATIONS: In this study, it is revealed that the administration of nicotine altered the cellular antioxidant defense system by inducing inflammation manifested by the infiltration of inflammatory cells and damage seen in liver, lungs, and kidneys. GT contributed to the reduction of toxicity of nicotine, probably mediated by free radicals, through downregulation of nicotine-induced upregulated antioxidant- and inflammation-related genes. Never the less, further in depth investigation on characterization of the active constituents of GT responsible for their effect seen here and the mechanism that contributes to the effects seen in this reports is highly demanded. Furthermore, GT extract could be considered as a dietary supplement for the reduction of nicotine toxicity among cigarette smoker.
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Affiliation(s)
- Wajdy J Al-Awaida
- Department of Biology and Biotechnology, American University of Madaba, Madaba, Jordan
| | - Malek A Zihlif
- Faculty of Medicine, Department of Pharmacology, The University of Jordan, Amman, Jordan
| | - Hamzeh J Al-Ameer
- Department of Biology and Biotechnology, American University of Madaba, Madaba, Jordan
| | - Ahmad Sharab
- Faculty of Medicine, Department of Pharmacology, The University of Jordan, Amman, Jordan
| | - Muhanad Akash
- Faculty of Agriculture, Department of Horticulture and Crop Science, The University of Jordan, Amman, Jordan
| | - Zaid A Aburubaiha
- Faculty of Health Sciences, Department of Medical Laboratories, American University of Madaba, Madaba, Jordan
| | - Isam A Fattash
- Department of Biology and Biotechnology, American University of Madaba, Madaba, Jordan
| | - Amer Imraish
- Faculty of Science, Department of Biology, The University of Jordan, Amman, Jordan
| | - Khedhir H Ali
- Faculty of Health Sciences, Department of Medical Laboratories, American University of Madaba, Madaba, Jordan
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Inhibitory effects of Syzygium aromaticum and Camellia sinensis methanolic extracts on the growth of Babesia and Theileria parasites. Ticks Tick Borne Dis 2019; 10:949-958. [PMID: 31101552 DOI: 10.1016/j.ttbdis.2019.04.016] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 04/18/2019] [Accepted: 04/22/2019] [Indexed: 01/28/2023]
Abstract
Currently, chemotherapeutics against piroplasmosis are also associated with toxicity and the emergence of drug-resistant parasites. Therefore, the discovery of new drug compounds is necessary for the effective control of bovine and equine piroplasms. Syzygium aromaticum (clove) and Camellia sinensis (green tea) have several documented medicinal properties. In the present study, the growth-inhibiting effects of S. aromaticum and C. sinensis methanolic extracts were evaluated in vitro and in vivo. The half-maximal inhibitory concentration (IC50) values for methanolic S. aromaticum against Babesia bovis, B. bigemina, B. divergens, B. caballi, and Theileria equi were 109.8 ± 3.8, 8.7 ± 0.09, 76.4 ± 4.5, 19.6 ± 2.2, and 60 ± 7.3 μg/ml, respectively. Methanolic C. sinensis exhibited IC50 values of 114 ± 6.1, 71.3 ± 3.7, 35.9 ± 6.8, 32.7 ± 20.3, and 60.8 ± 7.9 μg/ml against B. bovis, B. bigemina, B. divergens, B. caballi, and T. equi, respectively. The toxicity assay on Madin-Darby bovine kidney (MDBK), mouse embryonic fibroblast (NIH/3T3), and human foreskin fibroblast (HFF) cell lines showed that methanolic S. aromaticum and methanolic C. sinensis affected only the viability of the MDBK cell line with half-maximal effective concentrations (EC50) of 894.7 ± 4.9 and 473.7 ± 7.4 μg/ml, respectively, while the viability of NIH/3T3 and HFF cell lines was not affected even at 1000 μg/ml. In the in vivo experiment, methanolic S. aromaticum and methanolic C. sinensis oral treatments at 150 mg/kg inhibited the growth of Babesia microti in mice by 69.2% and 42.4%, respectively. These findings suggest that methanolic S. aromaticum and methanolic C. sinensis extracts have the potential as alternative remedies for treating piroplasmosis.
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Otton R, Bolin AP, Ferreira LT, Marinovic MP, Rocha ALS, Mori MA. Polyphenol-rich green tea extract improves adipose tissue metabolism by down-regulating miR-335 expression and mitigating insulin resistance and inflammation. J Nutr Biochem 2018; 57:170-179. [PMID: 29734116 DOI: 10.1016/j.jnutbio.2018.03.024] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 03/19/2018] [Accepted: 03/23/2018] [Indexed: 01/07/2023]
Abstract
Obesity leads to changes in miRNA expression in adipose tissue, and this modulation is linked to the pathophysiology of the disease. Green tea (GT) is a natural source of polyphenols that have been shown to confer health benefits, particularly preventing metabolic diseases. Here, we investigated if the beneficial effects of GT in obesity results from changes in the miRNA profile in white adipose tissue. GT treatment [500 mg/body weight (BW)/12 weeks] increased energy expenditure of high-fat diet-fed mice (16 weeks), leading to reduced weight gain, decreased adiposity, reduced inflammation and improved insulin sensitivity. These phenotypes were associated with a decrease in the expression of miR-335 in the adipose tissue. miR-335 was up-regulated by TNF-α in adipocytes and, in turn, down-regulated genes involved in insulin signaling and lipid metabolism. On the other hand, GT inhibited TNF-α effect. In conclusion, miR-335 serves as a link between inflammation and impaired metabolism in adipose tissue, providing an important mechanistic insight into the molecular basis underlying GT action during obesity.
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Affiliation(s)
- Rosemari Otton
- Interdisciplinary Post-graduate Program in Health Sciences, CBS, Cruzeiro do Sul University, São Paulo, 03342-000, Brazil.
| | - Anaysa Paola Bolin
- Department of Pharmacology, Biomedical Sciences Institute, University of São Paulo, São Paulo, 05508-000, Brazil
| | - Leticia Torres Ferreira
- Interdisciplinary Post-graduate Program in Health Sciences, CBS, Cruzeiro do Sul University, São Paulo, 03342-000, Brazil
| | - Marcelo Paradiso Marinovic
- Interdisciplinary Post-graduate Program in Health Sciences, CBS, Cruzeiro do Sul University, São Paulo, 03342-000, Brazil
| | - Andrea Livia Silva Rocha
- Department of Biochemistry and Tissue Biology, Universidade Estadual de Campinas, Campinas, 13083-862, Brazil
| | - Marcelo Alves Mori
- Department of Biochemistry and Tissue Biology, Universidade Estadual de Campinas, Campinas, 13083-862, Brazil
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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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23
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Bedrood Z, Rameshrad M, Hosseinzadeh H. Toxicological effects of Camellia sinensis (green tea): A review. Phytother Res 2018; 32:1163-1180. [PMID: 29575316 DOI: 10.1002/ptr.6063] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2017] [Revised: 01/14/2018] [Accepted: 01/26/2018] [Indexed: 12/21/2022]
Abstract
Many scientific articles proved that green tea (GT), Camellia sinensis, has a great potential to manage central nervous system, cardiovascular, and metabolic diseases and treat cancer and inflammatory disorders. However, it is important to consider that "natural" is not always "safe." Some relevant articles reported side effects of GT, detrimental effects on health. The aim of this study is to provide a classified report about the toxicity of GT and its main constituents in acute, subacute, subchronic, and chronic states. Furthermore, it discusses on the cytotoxicity, genotoxicity, mutagenicity, carcinogenicity, and developmental toxicity of GT and its main constituents. The most important side effects have been reported hepatotoxicity and gastrointestinal disorders specially while consumed on an empty stomach. GT and its main components are not major teratogen, mutagen, or carcinogen substances. However, there is limited data in using them during pregnancy, and they should be used with caution in pregnancy, breast-feeding, and susceptible people. Because GT and its main components have a wide variety of drug interactions, consideration should be taken in coadministration of them with narrow therapeutic indexed drugs. Furthermore, they evoke selective cytotoxicity on cancerous cells that could engage them as an adjuvant substance in cancer therapy.
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Affiliation(s)
- Zeinab Bedrood
- Department of Pharmacodynamy and Toxicology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Maryam Rameshrad
- Pharmaceutical Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Hossein Hosseinzadeh
- Department of Pharmacodynamy and Toxicology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran.,Pharmaceutical Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
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24
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Hu J, Webster D, Cao J, Shao A. The safety of green tea and green tea extract consumption in adults - Results of a systematic review. Regul Toxicol Pharmacol 2018; 95:412-433. [PMID: 29580974 DOI: 10.1016/j.yrtph.2018.03.019] [Citation(s) in RCA: 196] [Impact Index Per Article: 32.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 03/17/2018] [Accepted: 03/20/2018] [Indexed: 12/22/2022]
Abstract
A systematic review of published toxicology and human intervention studies was performed to characterize potential hazards associated with consumption of green tea and its preparations. A review of toxicological evidence from laboratory studies revealed the liver as the target organ and hepatotoxicity as the critical effect, which was strongly associated with certain dosing conditions (e.g. bolus dose via gavage, fasting), and positively correlated with total catechin and epigallocatechingallate (EGCG) content. A review of adverse event (AE) data from 159 human intervention studies yielded findings consistent with toxicological evidence in that a limited range of concentrated, catechin-rich green tea preparations resulted in hepatic AEs in a dose-dependent manner when ingested in large bolus doses, but not when consumed as brewed tea or extracts in beverages or as part of food. Toxico- and pharmacokinetic evidence further suggests internal dose of catechins is a key determinant in the occurrence and severity of hepatotoxicity. A safe intake level of 338 mg EGCG/day for adults was derived from toxicological and human safety data for tea preparations ingested as a solid bolus dose. An Observed Safe Level (OSL) of 704 mg EGCG/day might be considered for tea preparations in beverage form based on human AE data.
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Affiliation(s)
- Jiang Hu
- Worldwide Scientific Affairs, Herbalife Nutrition, Torrance, CA 90502, USA.
| | - Donna Webster
- Product Science, Herbalife Nutrition, Torrance, CA 90502, USA.
| | - Joyce Cao
- Global Post Market Safety Surveillance, Herbalife Nutrition, Torrance, CA 90502, USA.
| | - Andrew Shao
- Independent Consultant, Rancho Palos Verdes, CA 90505, USA.
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25
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Therapeutic dose of green tea extract provokes liver damage and exacerbates paracetamol-induced hepatotoxicity in rats through oxidative stress and caspase 3-dependent apoptosis. Biomed Pharmacother 2017; 96:798-811. [DOI: 10.1016/j.biopha.2017.10.055] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2017] [Revised: 10/02/2017] [Accepted: 10/10/2017] [Indexed: 12/12/2022] Open
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26
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Liang Y, Liu KWK, Yeung SC, Li X, Ip MSM, Mak JCW. (-)-Epigallocatechin-3-gallate Reduces Cigarette Smoke-Induced Airway Neutrophilic Inflammation and Mucin Hypersecretion in Rats. Front Pharmacol 2017; 8:618. [PMID: 28932196 PMCID: PMC5592236 DOI: 10.3389/fphar.2017.00618] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Accepted: 08/24/2017] [Indexed: 12/20/2022] Open
Abstract
Background: Cigarette smoking is the leading cause of chronic obstructive pulmonary disease. (-)-Epigallocatechin-3-gallate (EGCG), the major catechins in Chinese green tea, has been studied for its anti-oxidative and anti-inflammatory properties in cell and animal models. In this study, we aimed to analyze the effects of EGCG on cigarette smoke (CS)-induced airway inflammation and mucus secretion in the CS-exposed rat model. Methods: Male Sprague-Dawley rats were randomly divided into either sham air (SA) or CS exposure. EGCG (50 mg/kg b.wt.) was given by oral gavage every other day in both SA and CS-exposed animals. Oxidative stress and inflammatory markers were determined in serum and/or bronchoalveolar lavage fluid by biochemical assays or ELISA. Lung morphological changes were examined by Periodic Acid-Schiff, Masson's Trichrome staining and immunohistochemical analysis. Western blot analysis was performed to explore the effects of EGCG on epidermal growth factor receptor (EGFR)-mediated signaling pathway. Results: (-)-Epigallocatechin-3-gallate treatment attenuated CS-induced oxidative stress, lung cytokine-induced neutrophil chemoattractant-1 release and neutrophil recruitment. CS exposure caused an increase in the number of goblet cells in line with MUC5AC upregulation, and increased lung collagen deposition, which were alleviated in the presence of EGCG. In addition, CS-induced phosphorylation of EGFR in rat lung was abrogated by EGCG treatment. Conclusion: (-)-Epigallocatechin-3-gallate treatment ameliorated CS-induced oxidative stress and neutrophilic inflammation, as well as airway mucus production and collagen deposition in rats. The present findings suggest that EGCG has a therapeutic effect on chronic airway inflammation and abnormal airway mucus production probably via inhibition of EGFR signaling pathway.
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Affiliation(s)
- Yingmin Liang
- Department of Medicine, The University of Hong KongPokfulam, Hong Kong.,Research Centre of Heart, Brain, Hormone and Healthy Aging, The University of Hong KongPokfulam, Hong Kong.,Shenzhen Institute of Research and Innovation, The University of Hong KongPokfulam, Hong Kong
| | - Kenneth W K Liu
- Department of Medicine, The University of Hong KongPokfulam, Hong Kong.,Research Centre of Heart, Brain, Hormone and Healthy Aging, The University of Hong KongPokfulam, Hong Kong
| | - Sze C Yeung
- Department of Medicine, The University of Hong KongPokfulam, Hong Kong.,Shenzhen Institute of Research and Innovation, The University of Hong KongPokfulam, Hong Kong
| | - Xiang Li
- Department of Medicine, The University of Hong KongPokfulam, Hong Kong.,Shenzhen Institute of Research and Innovation, The University of Hong KongPokfulam, Hong Kong
| | - Mary S M Ip
- Department of Medicine, The University of Hong KongPokfulam, Hong Kong.,Research Centre of Heart, Brain, Hormone and Healthy Aging, The University of Hong KongPokfulam, Hong Kong.,Shenzhen Institute of Research and Innovation, The University of Hong KongPokfulam, Hong Kong
| | - Judith C W Mak
- Department of Medicine, The University of Hong KongPokfulam, Hong Kong.,Research Centre of Heart, Brain, Hormone and Healthy Aging, The University of Hong KongPokfulam, Hong Kong.,Shenzhen Institute of Research and Innovation, The University of Hong KongPokfulam, Hong Kong.,Department of Pharmacology and Pharmacy, The University of Hong KongPokfulam, Hong Kong
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27
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Liu Z, Liu D, Cheng J, Mei S, Fu Y, Lai W, Wang Y, Xu Y, Vo TD, Lynch BS. Lipid-soluble green tea extract: Genotoxicity and subchronic toxicity studies. Regul Toxicol Pharmacol 2017; 86:366-373. [DOI: 10.1016/j.yrtph.2017.04.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Revised: 03/30/2017] [Accepted: 04/02/2017] [Indexed: 12/24/2022]
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28
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Yamashita M, Kumazoe M, Nakamura Y, Won YS, Bae J, Yamashita S, Tachibana H. The Combination of Green Tea Extract and Eriodictyol Inhibited High-Fat/High-Sucrose Diet-Induced Cholesterol Upregulation Is Accompanied by Suppression of Cholesterol Synthesis Enzymes. J Nutr Sci Vitaminol (Tokyo) 2017; 62:249-256. [PMID: 27725410 DOI: 10.3177/jnsv.62.249] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Western diets induce obesity associated with an increased risk of hypercholesterolaemia. Indeed, obesity-induced hypercholesterolaemia is correlated with increased coronary cardiovascular disease (CVD) risk. Male C57BL/6J mice were fed a normal diet, high-fat and high-sucrose diet (HF/HS), HF/HS with green tea extract powder diet (HF/HS+GT), HF/HS with eriodictyol diet (HF/HS+Eri), or HF/HS with green tea extract powder and eriodictyol diet (HF/HS+GT+Eri) for 8 wk. Body weight was lower in the HF/HS+GT+Eri group than in the HF/HS group (-8.3%, p<0.01). The HF/HS diet elicited an upregulation of total cholesterol levels (-63%, p<0.001), and low-density lipoprotein (LDL) levels (-89%, p<0.001) were significantly suppressed by the GT+Eri diet. Conversely, no change (p>0.05) was observed in the HF/HS+GT and HF/HS+Eri groups. The HF/HS diet-induced hepatic mRNA increase in 3-hydroxy-3-methylglutaryl-coenzyme A reductase (HMGCR) was ameliorated (-73%) by the oral administration of green tea extract and eriodictyol. Moreover, the GT+Eri diet suppressed HF/HS diet-induced upregulation of 3-hydroxy-3-methylglutaryl-coenzyme A synthase (HMGCS) (-75%, p<0.05). Furthermore, the LDL receptor (LDLR) levels were higher in the HF/HS+GT+Eri group (+50%, p<0.05) than in the HF/HS group. These results suggest that a combination of green tea and eriodictyol decreases cholesterol levels, particularly LDL levels, accompanied by the suppression of HMGCR and HMGCS levels and upregulation of LDLR levels in the liver.
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Affiliation(s)
- Mai Yamashita
- Division of Applied Biological Chemistry, Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University
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29
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Yates AA, Erdman JW, Shao A, Dolan LC, Griffiths JC. Bioactive nutrients - Time for tolerable upper intake levels to address safety. Regul Toxicol Pharmacol 2017; 84:94-101. [PMID: 28110066 DOI: 10.1016/j.yrtph.2017.01.002] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 01/17/2017] [Indexed: 02/07/2023]
Abstract
There is increasing interest by consumers, researchers, and regulators into the roles that certain bioactive compounds, derived from plants and other natural sources, can play in health maintenance and promotion, and even prolonging a productive quality of life. Research has rapidly emerged suggesting that a wide range of compounds and mixtures in and from plants (such as fruits and vegetables, tea and cocoa) and animals (such as fish and probiotics) may exert substantial health benefits. There is interest in exploring the possibility of establishing recommended intakes or dietary guidance for certain bioactive substances to help educate consumers. A key aspect of establishing dietary guidance is the assessment of safety/toxicity of these substances. Toxicologists need to be involved in both the development of the safety framework and in the evaluation of the science to establish maximum intake/upper limits.
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Affiliation(s)
- Allison A Yates
- Food and Nutrition Board, Institute of Medicine, National Research Council, Johnson City, TN 37615, United States.
| | - John W Erdman
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States.
| | - Andrew Shao
- Global Nutrition Policy, Herbalife Nutrition, Los Angeles, CA 90015, United States.
| | | | - James C Griffiths
- Science & International Affairs, Council for Responsible Nutrition, Washington, DC 20036, United States.
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30
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Kamei A, Watanabe Y, Shinozaki F, Yasuoka A, Shimada K, Kondo K, Ishijima T, Toyoda T, Arai S, Kondo T, Abe K. Quantitative deviating effects of maple syrup extract supplementation on the hepatic gene expression of mice fed a high-fat diet. Mol Nutr Food Res 2016; 61. [DOI: 10.1002/mnfr.201600477] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2016] [Revised: 08/24/2016] [Accepted: 09/01/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Asuka Kamei
- Project for Development of Food Functionality Assessment Methods; Kanagawa Academy of Science and Technology; LiSE 4F C-4, 3-25-13 Tonomachi, Kawasaki-ku Kawasaki Kanagawa Japan
| | - Yuki Watanabe
- Project for Development of Food Functionality Assessment Methods; Kanagawa Academy of Science and Technology; LiSE 4F C-4, 3-25-13 Tonomachi, Kawasaki-ku Kawasaki Kanagawa Japan
| | - Fumika Shinozaki
- Project for Development of Food Functionality Assessment Methods; Kanagawa Academy of Science and Technology; LiSE 4F C-4, 3-25-13 Tonomachi, Kawasaki-ku Kawasaki Kanagawa Japan
| | - Akihito Yasuoka
- Project for Development of Food Functionality Assessment Methods; Kanagawa Academy of Science and Technology; LiSE 4F C-4, 3-25-13 Tonomachi, Kawasaki-ku Kawasaki Kanagawa Japan
| | - Kousuke Shimada
- Project for Development of Food Functionality Assessment Methods; Kanagawa Academy of Science and Technology; LiSE 4F C-4, 3-25-13 Tonomachi, Kawasaki-ku Kawasaki Kanagawa Japan
| | - Kaori Kondo
- Project for Development of Food Functionality Assessment Methods; Kanagawa Academy of Science and Technology; LiSE 4F C-4, 3-25-13 Tonomachi, Kawasaki-ku Kawasaki Kanagawa Japan
| | - Tomoko Ishijima
- Graduate School of Agricultural and Life Science; The University of Tokyo; 1-1-1 Yayoi, Bunkyo-ku Tokyo Japan
| | - Tsudoi Toyoda
- Graduate School of Agricultural and Life Science; The University of Tokyo; 1-1-1 Yayoi, Bunkyo-ku Tokyo Japan
| | - Soichi Arai
- Project for Development of Food Functionality Assessment Methods; Kanagawa Academy of Science and Technology; LiSE 4F C-4, 3-25-13 Tonomachi, Kawasaki-ku Kawasaki Kanagawa Japan
- General Research Institute; Tokyo University of Agriculture; 1-1-1 Sakuragaoka, Setagaya-ku Tokyo Japan
| | - Takashi Kondo
- Project for Development of Food Functionality Assessment Methods; Kanagawa Academy of Science and Technology; LiSE 4F C-4, 3-25-13 Tonomachi, Kawasaki-ku Kawasaki Kanagawa Japan
| | - Keiko Abe
- Project for Development of Food Functionality Assessment Methods; Kanagawa Academy of Science and Technology; LiSE 4F C-4, 3-25-13 Tonomachi, Kawasaki-ku Kawasaki Kanagawa Japan
- Graduate School of Agricultural and Life Science; The University of Tokyo; 1-1-1 Yayoi, Bunkyo-ku Tokyo Japan
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31
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Teschke R, Larrey D, Melchart D, Danan G. Traditional Chinese Medicine (TCM) and Herbal Hepatotoxicity: RUCAM and the Role of Novel Diagnostic Biomarkers Such as MicroRNAs. MEDICINES (BASEL, SWITZERLAND) 2016; 3:E18. [PMID: 28930128 PMCID: PMC5456249 DOI: 10.3390/medicines3030018] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Revised: 07/04/2016] [Accepted: 07/06/2016] [Indexed: 02/08/2023]
Abstract
Background: Traditional Chinese Medicine (TCM) with its focus on herbal use is popular and appreciated worldwide with increased tendency, although its therapeutic efficacy is poorly established for most herbal TCM products. Treatment was perceived as fairly safe but discussions emerged more recently as to whether herb induced liver injury (HILI) from herbal TCM is a major issue; Methods: To analyze clinical and case characteristics of HILI caused by herbal TCM, we undertook a selective literature search in the PubMed database with the search items Traditional Chinese Medicine, TCM, alone and combined with the terms herbal hepatotoxicity or herb induced liver injury; Results: HILI caused by herbal TCM is rare and similarly to drugs can be caused by an unpredictable idiosyncratic or a predictable intrinsic reaction. Clinical features of liver injury from herbal TCM products are variable, and specific diagnostic biomarkers such as microsomal epoxide hydrolase, pyrrole-protein adducts, metabolomics, and microRNAs are available for only a few TCM herbs. The diagnosis is ascertained if alternative causes are validly excluded and causality levels of probable or highly probable are achieved applying the liver specific RUCAM (Roussel Uclaf Causality Assessment Method) as the most commonly used diagnostic tool worldwide. Case evaluation may be confounded by inappropriate or lacking causality assessment, poor herbal product quality, insufficiently documented cases, and failing to exclude alternative causes such as infections by hepatotropic viruses including hepatitis E virus infections; Conclusion: Suspected cases of liver injury from herbal TCM represent major challenges that deserve special clinical and regulatory attention to improve the quality of case evaluations and ascertain patients' safety and benefit.
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Affiliation(s)
- Rolf Teschke
- Department of Internal Medicine II, Division of Gastroenterology and Hepatology, Klinikum Hanau, D-63450 Hanau, Teaching Hospital of the Medical Faculty of the Goethe University, Frankfurt/Main D-63450, Germany.
| | - Dominique Larrey
- Department of Liver and Transplantation-IRB-INSERM (Institut de Recherche Biologique-INstitut de la Santé Et de la Recherche Médicale) 1183, Saint Eloi Hospital, Montpellier University, 34295 Montpellier, France.
| | - Dieter Melchart
- Competence Centre for Complementary Medicine and Naturopathy (CoCoNat), Klinikum rechts der Isar, Technische Universität München, Munich D-80801, Germany.
- Institute for Complementary and Integrative Medicine, University Hospital Zurich and University of Zurich, Zurich CH-8091, Switzerland.
| | - Gaby Danan
- Pharmacovigilance Consultancy, Paris 75020, France.
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32
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Ayrle H, Mevissen M, Kaske M, Nathues H, Gruetzner N, Melzig M, Walkenhorst M. Medicinal plants--prophylactic and therapeutic options for gastrointestinal and respiratory diseases in calves and piglets? A systematic review. BMC Vet Res 2016; 12:89. [PMID: 27268043 PMCID: PMC4896019 DOI: 10.1186/s12917-016-0714-8] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 05/30/2016] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Gastrointestinal and respiratory diseases in calves and piglets lead to significant economic losses in livestock husbandry. A high morbidity has been reported for diarrhea (calves ≤ 35%; piglets ≤ 50%) and for respiratory diseases (calves ≤ 80%; piglets ≤ 40%). Despite a highly diverse etiology and pathophysiology of these diseases, treatment with antimicrobials is often the first-line therapy. Multi-antimicrobial resistance in pathogens results in international accordance to strengthen the research in novel treatment options. Medicinal plants bear a potential as alternative or additional treatment. Based on the versatile effects of their plant specific multi-component-compositions, medicinal plants can potentially act as 'multi-target drugs'. Regarding the plurality of medicinal plants, the aim of this systematic review was to identify potential medicinal plant species for prevention and treatment of gastrointestinal and respiratory diseases and for modulation of the immune system and inflammation in calves and piglets. RESULTS Based on nine initial sources including standard textbooks and European ethnoveterinary studies, a total of 223 medicinal plant species related to the treatment of gastrointestinal and respiratory diseases was identified. A defined search strategy was established using the PRISMA statement to evaluate 30 medicinal plant species starting from 20'000 peer-reviewed articles published in the last 20 years (1994-2014). This strategy led to 418 references (257 in vitro, 84 in vivo and 77 clinical trials, thereof 48 clinical trials in veterinary medicine) to evaluate effects of medicinal plants and their efficacy in detail. The findings indicate that the most promising candidates for gastrointestinal diseases are Allium sativum L., Mentha x piperita L. and Salvia officinalis L.; for diseases of the respiratory tract Echinacea purpurea (L.) MOENCH, Thymus vulgaris L. and Althea officinalis L. were found most promising, and Echinacea purpurea (L.) MOENCH, Camellia sinensis (L.) KUNTZE, Glycyrrhiza glabra L. and Origanum vulgare L. were identified as best candidates for modulation of the immune system and inflammation. CONCLUSIONS Several medicinal plants bear a potential for novel treatment strategies for young livestock. There is a need for further research focused on gastrointestinal and respiratory diseases in calves and piglets, and the findings of this review provide a basis on plant selection for future studies.
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Affiliation(s)
- Hannah Ayrle
- Department of Livestock Sciences, Research Institute of Organic Agriculture (FiBL), Ackerstrasse 113, postbox 219, Frick, 5070, Switzerland. .,Division Veterinary Pharmacology & Toxicology, Department Clinical Research and Veterinary Public Health, Vetsuisse Faculty, University of Bern, Laenggassstrasse 124, Bern, 3012, Switzerland.
| | - Meike Mevissen
- Division Veterinary Pharmacology & Toxicology, Department Clinical Research and Veterinary Public Health, Vetsuisse Faculty, University of Bern, Laenggassstrasse 124, Bern, 3012, Switzerland
| | - Martin Kaske
- Department of Farm Animals, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 260, Zurich, 8057, Switzerland
| | - Heiko Nathues
- Department of Clinical Veterinary Medicine, Swine Clinic, Vetsuisse Faculty, University of Bern, Bremgartenstrasse 109a, Bern, 3012, Switzerland
| | - Niels Gruetzner
- Department of Clinical Veterinary Medicine, Swine Clinic, Vetsuisse Faculty, University of Bern, Bremgartenstrasse 109a, Bern, 3012, Switzerland
| | - Matthias Melzig
- Dahlem Centre of Plant Sciences, Institute of Pharmacy, Freie Universität Berlin, Koenigin-Luise-Strasse 2 + 4, Berlin, 14195, Germany
| | - Michael Walkenhorst
- Department of Livestock Sciences, Research Institute of Organic Agriculture (FiBL), Ackerstrasse 113, postbox 219, Frick, 5070, Switzerland
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33
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Ramachandran B, Jayavelu S, Murhekar K, Rajkumar T. Repeated dose studies with pure Epigallocatechin-3-gallate demonstrated dose and route dependant hepatotoxicity with associated dyslipidemia. Toxicol Rep 2016; 3:336-345. [PMID: 28959554 PMCID: PMC5615837 DOI: 10.1016/j.toxrep.2016.03.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2016] [Revised: 02/15/2016] [Accepted: 03/02/2016] [Indexed: 12/22/2022] Open
Abstract
EGCG (Epigallocatechin-3-gallate) is the major active principle catechin found in green tea. Skepticism regarding the safety of consuming EGCG is gaining attention, despite the fact that it is widely being touted for its potential health benefits, including anti-cancer properties. The lack of scientific data on safe dose levels of pure EGCG is of concern, while EGCG has been commonly studied as a component of GTE (Green tea extract) and not as a single active constituent. This study has been carried out to estimate the maximum tolerated non-toxic dose of pure EGCG and to identify the treatment related risk factors. In a fourteen day consecutive treatment, two different administration modalities were compared, offering an improved [i.p (intraperitoneal)] and limited [p.o (oral)] bioavailability. A trend of dose and route dependant hepatotoxicity was observed particularly with i.p treatment and EGCG increased serum lipid profile in parallel to hepatotoxicity. Fourteen day tolerable dose of EGCG was established as 21.1 mg/kg for i.p and 67.8 mg/kg for p.o. We also observed that, EGCG induced effects by both treatment routes are reversible, subsequent to an observation period for further fourteen days after cessation of treatment. It was demonstrated that the severity of EGCG induced toxicity appears to be a function of dose, route of administration and period of treatment.
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Affiliation(s)
- Balaji Ramachandran
- Department of Molecular Oncology, Cancer Institute (W.I.A), No. 38, Sardar Patel Road, Adyar, 600 036 Chennai, India
| | - Subramani Jayavelu
- Department of Molecular Oncology, Cancer Institute (W.I.A), No. 38, Sardar Patel Road, Adyar, 600 036 Chennai, India
| | - Kanchan Murhekar
- Department of Oncopathology, Cancer Institute (W.I.A), No. 38, Sardar Patel Road, Adyar, 600 036 Chennai, India
| | - Thangarajan Rajkumar
- Department of Molecular Oncology, Cancer Institute (W.I.A), No. 38, Sardar Patel Road, Adyar, 600 036 Chennai, India
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van der Merwe JD, de Beer D, Joubert E, Gelderblom WCA. Short-Term and Sub-Chronic Dietary Exposure to Aspalathin-Enriched Green Rooibos (Aspalathus linearis) Extract Affects Rat Liver Function and Antioxidant Status. Molecules 2015; 20:22674-90. [PMID: 26694346 PMCID: PMC6332203 DOI: 10.3390/molecules201219868] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 12/09/2015] [Accepted: 12/11/2015] [Indexed: 01/24/2023] Open
Abstract
An aspalathin-enriched green rooibos (Aspalathus linearis) extract (GRE) was fed to male Fischer rats in two independent studies for 28 and 90 days. The average dietary total polyphenol (TP) intake was 75.6 and 62.7 mg Gallic acid equivalents (GAE)/kg body weight (bw)/day over 28 and 90 days, respectively, equaling human equivalent doses (HEDs) of 12.3 and 10.2 GAE mg/kg bw/day. Aspalathin intake of 29.5 mg/kg bw/day represents a HED of 4.8 mg/kg bw/day (90 day study). Consumption of GRE increased feed intake significantly (p < 0.05) compared to the control after 90 days, but no effect on body and organ weight parameters was observed. GRE significantly (p < 0.05) reduced serum total cholesterol and iron levels, whilst significantly (p < 0.05) increasing alkaline phosphatase enzyme activity after 90 days. Endogenous antioxidant enzyme activity in the liver, i.e., catalase and superoxide dismutase activity, was not adversely affected. Glutathione reductase activity significantly (p < 0.05) increased after 28 days, while glutathione (GSH) content was decreased after 90 days, suggesting an altered glutathione redox cycle. Quantitative Real Time polymerase chain reaction (PCR) analysis showed altered expression of certain antioxidant defense and oxidative stress related genes, indicative, among others, of an underlying oxidative stress related to changes in the GSH redox pathway and possible biliary dysfunction.
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Affiliation(s)
- Johanna Debora van der Merwe
- Department of Food Science, Stellenbosch University, Private Bag X1, Matieland (Stellenbosch) 7602, South Africa.
| | - Dalene de Beer
- Post-Harvest and Wine Technology Division, Agricultural Research Council (ARC), Infruitec-Nietvoorbij, Private Bag X5026, Stellenbosch 7599, South Africa.
| | - Elizabeth Joubert
- Department of Food Science, Stellenbosch University, Private Bag X1, Matieland (Stellenbosch) 7602, South Africa.
- Post-Harvest and Wine Technology Division, Agricultural Research Council (ARC), Infruitec-Nietvoorbij, Private Bag X5026, Stellenbosch 7599, South Africa.
| | - Wentzel C A Gelderblom
- Institute of Biomedical and Microbial Biotechnology, Cape Peninsula University of Technology, P. O. Box 1906, Bellville 7535, South Africa.
- Department of Biochemistry, Stellenbosch University, Private Bag X1, Matieland (Stellenbosch) 7602, South Africa.
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Li K, Zhou X, Yang X, Shi X, Song X, Ye C, Ko CH. Subacute oral toxicity of cocoa tea ( Camellia ptilophylla) water extract in SD rats. Int J Food Sci Technol 2015. [DOI: 10.1111/ijfs.12905] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Kaikai Li
- School of Life Sciences; Sun Yat-sen University; Guangzhou 510275 China
- Institute of Chinese Medicine; The Chinese University of Hong Kong; Shatin New Territories Hong Kong SAR 999077 China
- State Key Laboratory of Phytochemistry and Plant Resources in West China; The Chinese University of Hong Kong; Shatin New Territories Hong Kong SAR 999077 China
| | - Xuelin Zhou
- Institute of Chinese Medicine; The Chinese University of Hong Kong; Shatin New Territories Hong Kong SAR 999077 China
- State Key Laboratory of Phytochemistry and Plant Resources in West China; The Chinese University of Hong Kong; Shatin New Territories Hong Kong SAR 999077 China
| | - Xiaorong Yang
- School of Life Sciences; Sun Yat-sen University; Guangzhou 510275 China
- School of Biological Science; Yili Normal University; Yining Xinjiang 835000 China
| | - Xianggang Shi
- School of Life Sciences; Sun Yat-sen University; Guangzhou 510275 China
| | - Xiaohong Song
- School of Life Sciences; Sun Yat-sen University; Guangzhou 510275 China
| | - Chuangxing Ye
- School of Life Sciences; Sun Yat-sen University; Guangzhou 510275 China
| | - Chun Hay Ko
- Institute of Chinese Medicine; The Chinese University of Hong Kong; Shatin New Territories Hong Kong SAR 999077 China
- State Key Laboratory of Phytochemistry and Plant Resources in West China; The Chinese University of Hong Kong; Shatin New Territories Hong Kong SAR 999077 China
- Shenzhen Research Institute; The Chinese University of Hong Kong; Shenzhen 518000 China
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Emoto Y, Yoshizawa K, Kinoshita Y, Yuri T, Yuki M, Sayama K, Shikata N, Tsubura A. Green tea extract suppresses N-methyl-N-nitrosourea-induced photoreceptor apoptosis in Sprague-Dawley rats. Graefes Arch Clin Exp Ophthalmol 2014; 252:1377-84. [PMID: 25012920 DOI: 10.1007/s00417-014-2702-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Revised: 06/17/2014] [Accepted: 06/21/2014] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND Retinitis pigmentosa (RP) is a group of inherited neurodegenerative human diseases characterized by the loss of photoreceptor cells by apoptosis and eventual blindness. A single intraperitoneal (ip) injection of N-methyl-N-nitrosourea (MNU) causes photoreceptor cell apoptosis within 7 days in rats. Green tea extract (THEA-FLAN 90S; GTE) is a common herbal supplement with pluripotent properties including antioxidant activity. The purpose of the present study was to evaluate the efficacy of GTE against photoreceptor apoptosis in 7-week-old female Sprague-Dawley rats that received a single ip injection of 40 mg/kg MNU. METHODS The oral administration of 250 mg/kg/day GTE was initiated 3 days prior to MNU injection and continued once daily throughout the experiment. Rats were sacrificed at 12, 24, and 72 h and 7 days after MNU injection, and the eyes were examined morphologically and morphometrically. The photoreceptor cell ratio, retinal damage ratio, and retinal preservation ratio were used to determine the structural and functional alterations. The number of apoptotic photoreceptor cells per mm(2) was determined in situ by TdT-mediated dUTP-digoxigenin nick end labeling (TUNEL). Our results indicated that oral administration of GTE significantly suppressed the loss of photoreceptor cells morphometrically 7 days after MNU injection. The number of TUNEL-positive cells per mm(2) in MNU-exposed rat central retina with or without GTE administration was 981 vs. 2056 at 24 h after MNU injection. CONCLUSIONS GTE structurally and functionally suppressed MNU-induced photoreceptor cell apoptosis. These findings indicate that GTE may help to ameliorate the onset and progression of human RP.
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Affiliation(s)
- Yuko Emoto
- Department of Pathology II, Kansai Medical University, Shinmachi 2-5-1, Hirakata, Osaka, 573-1010, Japan
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Emoto Y, Yoshizawa K, Kinoshita Y, Yuki M, Yuri T, Yoshikawa Y, Sayama K, Tsubura A. Green Tea Extract-induced Acute Hepatotoxicity in Rats. J Toxicol Pathol 2014; 27:163-74. [PMID: 25378801 PMCID: PMC4217233 DOI: 10.1293/tox.2014-0007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Accepted: 04/17/2014] [Indexed: 12/15/2022] Open
Abstract
Although green tea is considered to be a healthy beverage, hepatotoxicity associated with the consumption of green tea extract has been reported. In the present study, we characterized the hepatotoxicity of green tea extract in rats and explored the responsible mechanism. Six-week-old IGS rats received a single intraperitoneal (ip) injection of 200 mg/kg green tea extract (THEA-FLAN 90S). At 8, 24, 48 and 72 hrs and 1 and 3 months after exposure, liver damage was assessed by using blood-chemistry, histopathology, and immunohistochemistry to detect cell death (TUNEL and caspase-3) and proliferative activity (PCNA). Analyses of malondialdehyde (MDA) in serum and the liver and of MDA and thymidine glycol (TG) by immunohistochemistry, as oxidative stress markers, were performed. Placental glutathione S-transferase (GST-P), which is a marker of hepatocarcinogenesis, was also immunohistochemically stained. To examine toxicity at older ages, 200 mg/kg green tea extract was administered to 18-wk-old female rats. In 6-wk-old rats, 12% of males and 50% of females died within 72 hrs. In 18-wk-old rats, 88% died within 72 hrs. The serum levels of aspartate aminotransferase, alanine aminotransferase and/or total bilirubin increased in both males and females. Single-cell necrosis with positive signs of TUNEL and caspase-3 was seen in perilobular hepatocytes from 8 hrs onward in all lobular areas. PCNA-positive hepatocytes increased at 48 hrs. MDA levels in the serum and liver tended to increase, and MDA- and TG-positive hepatocytes were seen immunohistochemically. GST-P–positive hepatocellular altered foci were detected in one female rat at the 3-month time point. In conclusion, a single injection of green tea extract induced acute and severe hepatotoxicity, which might be associated with lipid peroxidation and DNA oxidative stress in hepatocytes.
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Affiliation(s)
- Yuko Emoto
- Pathology II, Kansai Medical University, 2-5-1 Shin-machi, Hirakata, Osaka 573-1010, Japan
| | - Katsuhiko Yoshizawa
- Pathology II, Kansai Medical University, 2-5-1 Shin-machi, Hirakata, Osaka 573-1010, Japan
| | - Yuichi Kinoshita
- Pathology II, Kansai Medical University, 2-5-1 Shin-machi, Hirakata, Osaka 573-1010, Japan
| | - Michiko Yuki
- Pathology II, Kansai Medical University, 2-5-1 Shin-machi, Hirakata, Osaka 573-1010, Japan
| | - Takashi Yuri
- Pathology II, Kansai Medical University, 2-5-1 Shin-machi, Hirakata, Osaka 573-1010, Japan
| | - Yutaka Yoshikawa
- Department of Health, Sports, and Nutrition, Faculty of Health and Welfare, Kobe Women's University, 4-7-2 Minatojima-nakamachi Chuo, Kobe, Hyogo, 650-0046 Japan
| | - Kazutoshi Sayama
- Faculty of Agriculture, Shizuoka University, 836 Ohya, Suruga, Shizuoka, Shizuoka 422-8529, Japan
| | - Airo Tsubura
- Pathology II, Kansai Medical University, 2-5-1 Shin-machi, Hirakata, Osaka 573-1010, Japan
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Kim SJ, Amankwah E, Connors S, Park HY, Rincon M, Cornnell H, Chornokur G, Hashim AI, Choi J, Tsai YY, Engelman RW, Kumar N, Park JY. Safety and chemopreventive effect of Polyphenon E in preventing early and metastatic progression of prostate cancer in TRAMP mice. Cancer Prev Res (Phila) 2014; 7:435-44. [PMID: 24501325 DOI: 10.1158/1940-6207.capr-13-0427-t] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Prostate cancer treatment is often accompanied by untoward side effects. Therefore, chemoprevention to reduce the risk and inhibit the progression of prostate cancer may be an effective approach to reducing disease burden. We investigated the safety and efficacy of Polyphenon E, a green tea extract, in reducing the progression of prostate cancer in transgenic adenocarcinoma of the mouse prostate (TRAMP) mice. A total of 119 male TRAMP and 119 C57BL/6J mice were treated orally with one of 3 doses of Polyphenon E (200, 500, and 1,000 mg/kg/day) in drinking water ad libitum replicating human achievable doses. Baseline assessments were performed before treatments. Safety and efficacy assessments during treatments were performed when mice were 12, 22, and 32 weeks old. The number and size of tumors in treated TRAMP mice were significantly decreased compared with untreated animals. In untreated 32 weeks old TRAMP mice, prostate carcinoma metastasis to distant sites was observed in 100% of mice (8/8), compared with 13% of mice (2/16) treated with high-dose Polyphenon E during the same period. Furthermore, Polyphenon E treatment significantly inhibited metastasis in TRAMP mice in a dose-dependent manner (P = 0.0003). Long-term (32 weeks) treatment with Polyphenon E was safe and well tolerated with no evidence of toxicity in C57BL/6J mice. Polyphenon E is an effective chemopreventive agent in preventing the progression of prostate cancer to metastasis in TRAMP mice. Polyphenon E showed no toxicity in these mouse models. Our findings provide additional evidence for the safety and chemopreventive effect of Polyphenon E in preventing metastatic progression of prostate cancer.
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Affiliation(s)
- Seung Joon Kim
- Department of Cancer Epidemiology, Moffitt Cancer Center, University of South Florida, College of Medicine, 12902 Magnolia Drive, Tampa, FL 33612.
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Zickri MB, Embaby A. Relation between Endogenous Stem Cells and Green Tea Extract in Overconsumption and Amiodarone Induced Thyroid Damage in Rat. Int J Stem Cells 2014; 6:113-20. [PMID: 24386555 DOI: 10.15283/ijsc.2013.6.2.113] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/25/2013] [Indexed: 01/03/2023] Open
Abstract
BACKGROUND AND OBJECTIVES Amiodarone (AM), one of the most commonly prescribed antiarrhythmics, is frequently associated with thyroid dysfunction. Green tea extract (GTE) supplementation would attenuate oxidative stress and activate progenitor cells. However, the potential toxicity of GTE on various organs when administered at high doses has not been completely investigated. The present study aimed at investigating the possible relation between endogenous stem cells and GTE in overconsumption and AM induced thyroid damage in albino rat. METHODS AND RESULTS Twenty four male albino rats were divided into control group, GTE group (rats given 50 mg/kg), Overconsumption group (rats given 1,000 mg/kg GTE), AM group (rats given 30 mg/kg) and combined AM, GTE therapy group. AM and GTE were administered orally 5 days/week for 8 weeks. Serological tests were performed. Thyroid sections were exposed to histological, immunohistochemical and morphometric studies. In overconsumption group, multiple distorted follicles with cellular debris in the lumen and multiple follicles devoid of colloid were found. In AM group, multiple follicles exhibiting crescent of colloid and few follicles devoid of colloid were detected. In combined therapy group, multiple follicles were filled with colloid. Significant decrease in area of colloid and significant increase in the area% of collagen were recorded in overconsumption and AM groups. Area% of CD 105 +ve cells denoted significant increase in combined therapy group. Serological tests were confirmative. CONCLUSIONS Endogenous SCs activation was proved in AM and GTE combined therapy group with regression of AM induced morphological, morphometric and serological changes. However, overconsumption of GTE recruited endogenous SCs suppression.
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Affiliation(s)
- Maha Baligh Zickri
- Department of Histology, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Azza Embaby
- Department of Histology, Faculty of Medicine, Beni-Suef University, Cairo, Egypt
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Kitadate K, Homma K, Roberts A, Maeda T. Thirteen-week oral dose toxicity study of Oligonol containing oligomerized polyphenols extracted from lychee and green tea. Regul Toxicol Pharmacol 2013; 68:140-6. [PMID: 24326174 DOI: 10.1016/j.yrtph.2013.12.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Revised: 11/26/2013] [Accepted: 12/01/2013] [Indexed: 11/24/2022]
Abstract
Oligonol is a functional food containing catechin-type monomers and proanthocyanidin oligomer converted from polymer forms via a novel manufacturing process. The catechin component of green tea extract has been associated with nasal toxicity in rats following subchronic exposure. To assess the potential for Oligonol to induce nasal toxicity a 13-week repeated oral dose toxicity study was conducted in rats using doses of 100, 300, and 1000 mg/kg/d. Clinical signs and mortality were not affected by Oligonol treatment. Compound-colored stools and an increase in food consumption were observed in some treated groups; however, there were no treatment-related differences in terminal body weights or with respect to the results of the gross postmortem examinations. Histopathological evaluation of the nasal cavity tissues revealed no treatment-related lesions. The results from this toxicity study indicate that Oligonol does not induce nasal toxicity and further supports the results of previous studies demonstrating the safety of Oligonol for human consumption.
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Affiliation(s)
- Kentaro Kitadate
- Amino Up Chemical Co., Ltd., 363-32 Shin-ei, Kiyota-ku, Sapporo 004-0839, Japan
| | - Kohei Homma
- Amino Up Chemical Co., Ltd., 363-32 Shin-ei, Kiyota-ku, Sapporo 004-0839, Japan
| | - Ashley Roberts
- Intertek Cantox, 2233 Argentia Rd., Suite 308, Mississauga, ON L5N 2X7, Canada
| | - Takahiro Maeda
- Amino Up Chemical Co., Ltd., 363-32 Shin-ei, Kiyota-ku, Sapporo 004-0839, Japan.
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Abd El-Moneim RA, Abd El-Mouaty HM. A comparative histological, immunohistochemical, and biochemical study of the effect of green tea extracts or chromium picolinate administration on the white visceral adipose tissue and liver in albino rats fed on high-fat diet. THE EGYPTIAN JOURNAL OF HISTOLOGY 2013; 36:882-898. [DOI: 10.1097/01.ehx.0000439094.19244.a8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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Green tea diet decreases PCB 126-induced oxidative stress in mice by up-regulating antioxidant enzymes. J Nutr Biochem 2013; 25:126-35. [PMID: 24378064 DOI: 10.1016/j.jnutbio.2013.10.003] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Revised: 10/22/2013] [Accepted: 10/28/2013] [Indexed: 12/18/2022]
Abstract
Superfund chemicals such as polychlorinated biphenyls pose a serious human health risk due to their environmental persistence and link to multiple diseases. Selective bioactive food components such as flavonoids have been shown to ameliorate PCB toxicity, but primarily in an in vitro setting. Here, we show that mice fed a green tea-enriched diet and subsequently exposed to environmentally relevant doses of coplanar PCB exhibit decreased overall oxidative stress primarily due to the up-regulation of a battery of antioxidant enzymes. C57BL/6 mice were fed a low-fat diet supplemented with green tea extract (GTE) for 12 weeks and exposed to 5 μmol PCB 126/kg mouse weight (1.63 mg/kg-day) on weeks 10, 11 and 12 (total body burden: 4.9 mg/kg). F2-isoprostane and its metabolites, established markers of in vivo oxidative stress, measured in plasma via HPLC-MS/MS exhibited fivefold decreased levels in mice supplemented with GTE and subsequently exposed to PCB compared to animals on a control diet exposed to PCB. Livers were collected and harvested for both messenger RNA and protein analyses, and it was determined that many genes transcriptionally controlled by aryl hydrocarbon receptor and nuclear factor (erythroid-derived 2)-like 2 proteins were up-regulated in PCB-exposed mice fed the green tea-supplemented diet. An increased induction of genes such as SOD1, GSR, NQO1 and GST, key antioxidant enzymes, in these mice (green tea plus PCB) may explain the observed decrease in overall oxidative stress. A diet supplemented with green tea allows for an efficient antioxidant response in the presence of PCB 126, which supports the emerging paradigm that healthful nutrition may be able to bolster and buffer a physiological system against the toxicities of environmental pollutants.
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Nakae Y, Dorchies OM, Stoward PJ, Zimmermann BF, Ritter C, Ruegg UT. Quantitative evaluation of the beneficial effects in the mdx mouse of epigallocatechin gallate, an antioxidant polyphenol from green tea. Histochem Cell Biol 2012; 137:811-27. [PMID: 22331205 PMCID: PMC3353109 DOI: 10.1007/s00418-012-0926-3] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/23/2012] [Indexed: 12/17/2022]
Abstract
In two separate previous studies, we reported that subcutaneous (sc) or oral administration of (−)-epigallocatechin-3-gallate (EGCG) limited the development of muscle degeneration of mdx mice, a mild phenotype model for Duchenne muscular dystrophy (DMD). However, it was not possible to conclude which was the more efficient route of EGCG administration because different strains of mdx mice, periods of treatment and methods of assessment were used. In this study, we investigated which administration routes and dosages of EGCG are the most effective for limiting the onset of dystrophic lesions in the same strain of mdx mice and applying the same methods of assessment. Three-week-old mdx mice were injected sc for 5 weeks with either saline or a daily average of 3 or 6 mg/kg EGCG. For comparison, age-matched mdx mice were fed for 5 weeks with either a diet containing 0.1% EGCG or a control diet. The effects of EGCG were assessed quantitatively by determining the activities of serum muscle-derived creatine kinase, isometric contractions of triceps surae muscles, integrated spontaneous locomotor activities, and oxidative stress and fibrosis in selected muscles. Oral administration of 180 mg/kg/day EGCG in the diet was found the most effective for significantly improving several parameters associated with muscular dystrophy. However, the improvements were slightly less than those observed previously for sc injection started immediately after birth. The efficacy of EGCG for limiting the development of dystrophic muscle lesions in mice suggests that EGCG may be of benefit for DMD patients.
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Affiliation(s)
- Yoshiko Nakae
- Pharmacology, Geneva-Lausanne School of Pharmaceutical Sciences, University of Geneva, 30 Quai Ernest Ansermet, 1211, Geneva 4, Switzerland.
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Green tea extract can potentiate acetaminophen-induced hepatotoxicity in mice. Food Chem Toxicol 2012; 50:1439-46. [PMID: 22306919 DOI: 10.1016/j.fct.2012.01.027] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2011] [Revised: 01/18/2012] [Accepted: 01/19/2012] [Indexed: 01/14/2023]
Abstract
Green tea extract (GTE) has been advocated as a hepatoprotective compound and a possible therapeutic agent for acetaminophen (APAP) overdose. This study was conducted to determine if GTE can provide protection against APAP-induced hepatotoxicity. Three different exposure scenarios were tested. The first involved administering APAP (150 mg/kg, orally) to mice followed 6h later by GTE (500 or 1000 mg/kg). The other two involved administering GTE prior to the APAP dose. GTE (500 or 1000 mg/kg, orally) was administered 3h prior to APAP (200 mg/kg, orally) or for three consecutive days (once-daily) followed by APAP (300 mg/kg) on the fourth day. Indices of hepatotoxicity were assessed 24h after the APAP dose. GTE potentiated APAP-induced hepatotoxicity when administered after the APAP dose. GTE caused significant glutathione depletion and this effect likely contributed to the observed potentiation. In contrast, GTE provided protection against APAP-induced hepatotoxicity when administered prior to the APAP dose. GTE dramatically decreased APAP covalent binding to protein indicating that less reactive metabolite was available to cause hepatocellular injury. These results highlight the potential for drug-dietary supplement interactions and the importance of testing multiple exposure scenarios to adequately model different types of potential interactions.
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Boorman G, Crabbs TA, Kolenda-Roberts H, Latimer K, Miller AD, Muravnick KB, Nyska A, Ochoa R, Pardo ID, Ramot Y, Rao DB, Schuh J, Suttie A, Travlos GS, Ward JM, Wolf JC, Elmore SA. Proceedings of the 2011 National Toxicology Program Satellite Symposium. Toxicol Pathol 2011; 40:321-44. [PMID: 22089839 DOI: 10.1177/0192623311427713] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The 2011 annual National Toxicology Program (NTP) Satellite Symposium, entitled "Pathology Potpourri," was held in Denver, Colorado in advance of the Society of Toxicologic Pathology's 30th Annual Meeting. The goal of the NTP Symposium is to present current diagnostic pathology or nomenclature issues to the toxicologic pathology community. This article presents summaries of the speakers' presentations, including diagnostic or nomenclature issues that were presented, along with select images that were used for audience voting or discussion. Some lesions and topics covered during the symposium include: proliferative lesions from various fish species including ameloblastoma, gas gland hyperplasia, nodular regenerative hepatocellular hyperplasia, and malignant granulosa cell tumor; spontaneous cystic hyperplasia in the stomach of CD1 mice and histiocytic aggregates in the duodenal villous tips of treated mice; an olfactory neuroblastoma in a cynomolgus monkey; various rodent skin lesions, including follicular parakeratotic hyperkeratosis, adnexal degeneration, and epithelial intracytoplasmic accumulations; oligodendroglioma and microgliomas in rats; a diagnostically challenging microcytic, hypochromic, responsive anemia in rats; a review of microcytes and microcytosis; nasal lesions associated with green tea extract and Ginkgo biloba in rats; corneal dystrophy in Dutch belted rabbits; valvulopathy in rats; and lymphoproliferative disease in a cynomolgus monkey.
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Affiliation(s)
- Gary Boorman
- Covance Laboratories, Inc., Chantilly, Virginia, USA
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Liu Y, Flynn TJ, Ferguson MS, Hoagland EM, Yu LL. Effects of dietary phenolics and botanical extracts on hepatotoxicity-related endpoints in human and rat hepatoma cells and statistical models for prediction of hepatotoxicity. Food Chem Toxicol 2011; 49:1820-7. [PMID: 21569817 DOI: 10.1016/j.fct.2011.04.034] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2011] [Revised: 04/22/2011] [Accepted: 04/27/2011] [Indexed: 01/15/2023]
Abstract
Toxicity assessment of botanical materials is difficult because they are typically complex mixtures of phytochemicals. In the present study, 16 phenolics were tested in both human (HepG2/C3A) and rat (MH1C1) hepatoma cells using a battery of eight toxicity endpoints. Cluster analysis was used to group the phenolics into four clusters for each cell type. Comparison of overall and individual liver activity of phenolics on both human and rat hepatoma cell lines showed significant differences for some endpoints. However, the cluster membership was similar across both cell types with the majority of phenolics clustering with the solvent control group (cluster 1). Each cell type produced a cluster of compounds with reported in vivo liver toxicity (cluster 2). Five herbal extracts were prepared and then tested as above. Using the cluster model developed with the phenolics, in the HepG2/C3A cells green tea was assigned to cluster 2 and the remaining four extracts to cluster 1. In the MH1C1 cells, green tea and thyme were assigned to cluster 2, cinnamon to cluster 4, and juniper berry and peppermint to cluster 1. The data suggest that this in vitro model may be useful for identifying hepatotoxic phenolics and botanical preparations rich in phenolics.
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Affiliation(s)
- Yitong Liu
- Department of Nutrition and Food Science, University of Maryland, College Park, MD 20742-7640, USA
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Schönthal AH. Adverse effects of concentrated green tea extracts. Mol Nutr Food Res 2011; 55:874-85. [PMID: 21538851 DOI: 10.1002/mnfr.201000644] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2010] [Revised: 02/09/2011] [Accepted: 03/11/2011] [Indexed: 01/08/2023]
Abstract
A myriad of health claims are being made in favor of the consumption of green tea. However, mostly due to the easy availability and greater than ever popularity of highly concentrated green tea extracts, sometimes combined with an attitude of more-is-better, certain health risks of green tea consumption have begun to emerge. Among such risks are the possibility of liver damage, the potential to interact with prescription drugs to alter their therapeutic efficacy, and the chance to cause harm when combined with other highly popular herbal remedies. This review will summarize documented examples of adverse effects of green tea in humans, and will discuss risks of copious consumption of highly concentrated green tea extracts as indicated by studies in animals. While there is no intention to minimize any of the scientifically established benefits of the use of green tea, the purpose of this review is to focus primarily on the potential for adverse effects and raise awareness of the rare, yet under-appreciated risks.
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Affiliation(s)
- Axel H Schönthal
- Department of Molecular Microbiology and Immunology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.
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