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Iloki Assanga SB, Lewis Luján LM, McCarty MF. Targeting beta-catenin signaling for prevention of colorectal cancer - Nutraceutical, drug, and dietary options. Eur J Pharmacol 2023; 956:175898. [PMID: 37481200 DOI: 10.1016/j.ejphar.2023.175898] [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: 03/11/2023] [Revised: 06/09/2023] [Accepted: 06/29/2023] [Indexed: 07/24/2023]
Abstract
Progressive up-regulation of β-catenin signaling is very common in the transformation of colorectal epithelium to colorectal cancer (CRC). Practical measures for opposing such signaling hence have potential for preventing or slowing such transformation. cAMP/PKA activity in colon epithelium, as stimulated by COX-2-generated prostaglandins and β2-adrenergic signaling, boosts β-catenin activity, whereas cGMP/PKG signaling has the opposite effect. Bacterial generation of short-chain fatty acids (as supported by unrefined high-carbohydrate diets, berberine, and probiotics), dietary calcium, daily aspirin, antioxidants opposing cox-2 induction, and nicotine avoidance, can suppress cAMP production in colonic epithelium, whereas cGMP can be boosted via linaclotides, PDE5 inhibitors such as sildenafil or icariin, and likely high-dose biotin. Selective activation of estrogen receptor-β by soy isoflavones, support of adequate vitamin D receptor activity with UV exposure or supplemental vitamin D, and inhibition of CK2 activity with flavanols such as quercetin, can also oppose β-catenin signaling in colorectal epithelium. Secondary bile acids, the colonic production of which can be diminished by low-fat diets and berberine, can up-regulate β-catenin activity by down-regulating farnesoid X receptor expression. Stimulation of PI3K/Akt via insulin, IGF-I, TLR4, and EGFR receptors boosts β-catenin levels via inhibition of glycogen synthase-3β; plant-based diets can down-regulate insulin and IGF-I levels, exercise training and leanness can keep insulin low, anthocyanins and their key metabolite ferulic acid have potential for opposing TLR4 signaling, and silibinin is a direct antagonist for EGFR. Partially hydrolyzed phytate can oppose growth factor-mediated down-regulation of β-catenin by inhibiting Akt activation. Multifactorial strategies for safely opposing β-catenin signaling can be complemented with measures that diminish colonic mutagenesis and DNA hypomethylation - such as avoidance of heme-rich meat and charred or processed meats, consumption of phase II-inductive foods and nutraceuticals (e.g., Crucifera), and assurance of adequate folate status.
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Affiliation(s)
- Simon Bernard Iloki Assanga
- Departamento de Ciencias Químico Biológicas, Universidad de Sonora, Blvd Luis Encinas y Rosales S/N Col. Centro, Hermosillo, Sonora, C.P. 83000, Mexico.
| | - Lidianys María Lewis Luján
- Technological Institute of Hermosillo (ITH), Ave. Tecnológico y Periférico Poniente S/N, Col. Sahuaro, Hermosillo, Sonora, C.P. 83170, México.
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Green Tea Extract to Prevent Colorectal Adenomas, Results of a Randomized, Placebo-Controlled Clinical Trial. Am J Gastroenterol 2022; 117:884-894. [PMID: 35213393 DOI: 10.14309/ajg.0000000000001706] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 12/27/2021] [Indexed: 12/11/2022]
Abstract
INTRODUCTION Preclinical, epidemiological, and small clinical studies suggest that green tea extract (GTE) and its major active component epigallocatechingallate (EGCG) exhibit antineoplastic effects in the colorectum. METHODS A randomized, double-blind trial of GTE standardized to 150 mg of EGCG b.i.d. vs placebo over 3 years was conducted to prevent colorectal adenomas (n = 1,001 with colon adenomas enrolled, 40 German centers). Randomization (1:1, n = 879) was performed after a 4-week run-in with GTE for safety assessment. The primary end point was the presence of adenoma/colorectal cancer at the follow-up colonoscopy 3 years after randomization. RESULTS The safety profile of GTE was favorable with no major differences in adverse events between the 2 well-balanced groups. Adenoma rate in the modified intention-to-treat set (all randomized participants [intention-to-treat population] and a follow-up colonoscopy 26-44 months after randomization; n = 632) was 55.7% in the placebo and 51.1% in the GTE groups. This 4.6% difference was not statistically significant (adjusted relative risk 0.905; P = 0.1613). The respective figures for the per-protocol population were 54.3% (151/278) in the placebo group and 48.3% (129/267) in the GTE group, indicating a slightly lower adenoma rate in the GTE group, which was not significant (adjusted relative risk 0.883; P = 0.1169). DISCUSSION GTE was well tolerated, but there was no statistically significant difference in the adenoma rate between the GTE and the placebo groups in the whole study population.
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Wu B, Shao Y, Zhao W, Zheng Y, Wang Y, Sun D. Dual functions of epigallocatechin gallate surface-modified Au nanorods@selenium composites for near-infrared-II light-responsive synergistic antibacterial therapy. J Biomater Appl 2022; 36:1812-1825. [PMID: 35232312 DOI: 10.1177/08853282211048570] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Diseases caused by bacterial infections pose ever-increasing threats to human health, making it important to explore alternative antibacterial strategies. Herein, epigallocatechin gallate (EGCG) surface-modified Au nanorods@selenium composites (ASE NPs) were developed for synergistic NIR-II light-responsive antibacterial therapy. In vitro antibacterial experiments demonstrated the improved antibacterial effect of ASE NPs against Staphylococcus aureus (S. aureus) compared with EGCG alone. In addition, in vivo studies demonstrated that ASE NPs cured skin wound infections and sepsis in mice caused by S. aureus. Au nanorods with excellent photothermal conversion realized synergistic photothermal therapy (PTT) in the NIR-II biowindow with an improved penetration depth at a low power density. More importantly, toxicity analysis showed that the composites had no toxic effects on major organs. Thus, the EGCG surface-modified Au nanorods@selenium composites with an NIR-II light-responsive synergistic activity hold great promise for the effective treatment of drug-resistant bacterial infections.
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Affiliation(s)
- Bingbing Wu
- School of life sciences, 12486Anhui Agricultural University, Hefei, Anhui, P.R. China
| | - Yuyan Shao
- School of life sciences, 12486Anhui Agricultural University, Hefei, Anhui, P.R. China
| | - Wei Zhao
- School of life sciences, 12486Anhui Agricultural University, Hefei, Anhui, P.R. China
| | - Yunfang Zheng
- School of life sciences, 12486Anhui Agricultural University, Hefei, Anhui, P.R. China
| | - Yunsheng Wang
- School of life sciences, 12486Anhui Agricultural University, Hefei, Anhui, P.R. China
| | - Dongdong Sun
- School of life sciences, 12486Anhui Agricultural University, Hefei, Anhui, P.R. China
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Nutraceuticals in the Mediterranean Diet: Potential Avenues for Breast Cancer Treatment. Nutrients 2021; 13:nu13082557. [PMID: 34444715 PMCID: PMC8400469 DOI: 10.3390/nu13082557] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2021] [Revised: 07/22/2021] [Accepted: 07/25/2021] [Indexed: 12/12/2022] Open
Abstract
The traditional Mediterranean Diet constitutes a food model that refers to the dietary patterns of the population living in countries bordering the Mediterranean Sea in the early 1960s. A huge volume of literature data suggests that the Mediterranean-style diet provides several dietary compounds that have been reported to exert beneficial biological effects against a wide spectrum of chronic illnesses, such as cardiovascular and neurodegenerative diseases and cancer including breast carcinoma. Among bioactive nutrients identified as protective factors for breast cancer, natural polyphenols, retinoids, and polyunsaturated fatty acids (PUFAs) have been reported to possess antioxidant, anti-inflammatory, immunomodulatory and antitumoral properties. The multiple anticancer mechanisms involved include the modulation of molecular events and signaling pathways associated with cell survival, proliferation, differentiation, migration, angiogenesis, antioxidant enzymes and immune responses. This review summarizes the anticancer action of some polyphenols, like resveratrol and epigallocatechin 3-gallate, retinoids and omega-3 PUFAs by highlighting the important hallmarks of cancer in terms of (i) cell cycle growth arrest, (ii) apoptosis, (iii) inflammation and (iv) angiogenesis. The data collected from in vitro and in vivo studies strongly indicate that these natural compounds could be the prospective candidates for the future anticancer therapeutics in breast cancer disease.
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Marzo F, Milagro FI, Barrenetxe J, Díaz MT, Martínez JA. Azoxymethane-Induced Colorectal Cancer Mice Treated with a Polyphenol-Rich Apple Extract Show Less Neoplastic Lesions and Signs of Cachexia. Foods 2021; 10:863. [PMID: 33921048 PMCID: PMC8071383 DOI: 10.3390/foods10040863] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 04/12/2021] [Accepted: 04/13/2021] [Indexed: 11/26/2022] Open
Abstract
Obesity is considered a risk factor for the development of colorectal cancer. In rodents, high-fat (HF) diets are able to increase the formation of azoxymethane (AOM)-induced polyps. Polyphenol-rich apple extracts have antioxidant and anti-inflammatory activities and may induce an amelioration of the manifestations of colorectal cancer. Twenty-seven male Crl:CD-1 mice received AOM during four weeks and were subsequently divided into three groups fed a HF diet (n = 9 each group): a non-supplemented group, a second group supplemented with apple extract at 1%, and a third group supplemented with the same apple extract at 1.5%. Energy metabolism and the respiratory quotient were not affected by the supplementation with the apple extract. Although body weight was not affected by the treatment, the mice supplemented with the apple extract showed less signs of cachexia than the non-treated mice. In the intestine, the mice supplemented with the apple extract showed lower sucrase, dipeptidyl-peptidase IV, and aminopeptidase N activities, and less intestinal lesions (aberrant crypt foci and polyps). Administration of a polyphenol-rich apple extract reduces the number of neoplastic lesions in mice with AOM-induced colorectal cancer and contributes to preserve adipose tissue mass.
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Affiliation(s)
- Florencio Marzo
- Laboratory of Animal Physiology and Nutrition, School of Agronomy, Universidad Pública de Navarra, 31006 Pamplona, Spain;
- ISFOOD (Research Institute for Innovation & Sustainable Development in Food Chain), Universidad Pública de Navarra, 31006 Pamplona, Spain
| | - Fermin I. Milagro
- Center for Nutrition Research, Department of Nutrition, Food Science and Physiology, University of Navarra, 31008 Pamplona, Spain; (J.B.); (J.A.M.)
- Navarra Institute for Health Research (IdISNA), 31006 Pamplona, Spain
- Centro de Investigación Biomédica en Red de la Fisiopatología de la Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Jaione Barrenetxe
- Center for Nutrition Research, Department of Nutrition, Food Science and Physiology, University of Navarra, 31008 Pamplona, Spain; (J.B.); (J.A.M.)
| | - María Teresa Díaz
- Departamento de Tecnología de Alimentos, Instituto Nacional de Investigación Agraria (INIA), Carretera de la Coruña, km7, 28040 Madrid, Spain;
| | - J. Alfredo Martínez
- Center for Nutrition Research, Department of Nutrition, Food Science and Physiology, University of Navarra, 31008 Pamplona, Spain; (J.B.); (J.A.M.)
- Navarra Institute for Health Research (IdISNA), 31006 Pamplona, Spain
- Centro de Investigación Biomédica en Red de la Fisiopatología de la Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, 28029 Madrid, Spain
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Adami GR, Tangney C, Schwartz JL, Dang KC. Gut/Oral Bacteria Variability May Explain the High Efficacy of Green Tea in Rodent Tumor Inhibition and Its Absence in Humans. Molecules 2020; 25:molecules25204753. [PMID: 33081212 PMCID: PMC7594096 DOI: 10.3390/molecules25204753] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 10/09/2020] [Accepted: 10/12/2020] [Indexed: 02/07/2023] Open
Abstract
Consumption of green tea (GT) and GT polyphenols has prevented a range of cancers in rodents but has had mixed results in humans. Human subjects who drank GT for weeks showed changes in oral microbiome. However, GT-induced changes in RNA in oral epithelium were subject-specific, suggesting GT-induced changes of the oral epithelium occurred but differed across individuals. In contrast, studies in rodents consuming GT polyphenols revealed obvious changes in epithelial gene expression. GT polyphenols are poorly absorbed by digestive tract epithelium. Their metabolism by gut/oral microbial enzymes occurs and can alter absorption and function of these molecules and thus their bioactivity. This might explain the overall lack of consistency in oral epithelium RNA expression changes seen in human subjects who consumed GT. Each human has different gut/oral microbiomes, so they may have different levels of polyphenol-metabolizing bacteria. We speculate the similar gut/oral microbiomes in, for example, mice housed together are responsible for the minimal variance observed in tissue GT responses within a study. The consistency of the tissue response to GT within a rodent study eases the selection of a dose level that affects tumor rates. This leads to the theory that determination of optimal GT doses in a human requires knowledge about the gut/oral microbiome in that human.
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Affiliation(s)
- Guy R. Adami
- Department of Oral Medicine & Diagnostic Sciences, Center for Molecular Biology of Oral Diseases, College of Dentistry, University of Illinois at Chicago, 801 South Paulina Street, Chicago, IL 60612, USA; (J.L.S.); (K.C.D.)
- Correspondence: ; Tel.: +1-312-996-6251
| | - Christy Tangney
- Department of Clinical Nutrition, College of Health Sciences, Rush University Medical Center, 600 South Paulina St, Room 716 AAC, Chicago, IL 60612, USA;
| | - Joel L. Schwartz
- Department of Oral Medicine & Diagnostic Sciences, Center for Molecular Biology of Oral Diseases, College of Dentistry, University of Illinois at Chicago, 801 South Paulina Street, Chicago, IL 60612, USA; (J.L.S.); (K.C.D.)
| | - Kim Chi Dang
- Department of Oral Medicine & Diagnostic Sciences, Center for Molecular Biology of Oral Diseases, College of Dentistry, University of Illinois at Chicago, 801 South Paulina Street, Chicago, IL 60612, USA; (J.L.S.); (K.C.D.)
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Casanova-Martí À, González-Abuín N, Serrano J, Blay MT, Terra X, Frost G, Pinent M, Ardévol A. Long Term Exposure to a Grape Seed Proanthocyanidin Extract Enhances L-Cell Differentiation in Intestinal Organoids. Mol Nutr Food Res 2020; 64:e2000303. [PMID: 32613679 DOI: 10.1002/mnfr.202000303] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 06/17/2020] [Indexed: 01/08/2023]
Abstract
SCOPE A grape-seed proanthocyanidin extract (GSPE) interacts at the intestinal level, enhancing glucagon-like peptide-1 (GLP-1) and peptide YY (PYY) release, which modulate appetite and glucose homeostasis. Thus, enhancing L-cell numbers could be a strategy to promote hormone production, providing a potential strategy for obesity and type-2 diabetes mellitus (T2DM) treatment. METHODS AND RESULTS Mice ileum organoids are used to evaluate the long-term effects of GSPE and two of its main components, epicatechin (EC) and gallic acid (GA), on intestinal differentiation. Hormone levels are determined using RIA and ELISA kits, and gene expression of transcription factors involved in intestinal cell differentiation, as well as markers of different cell types, are assessed by real-time qPCR. GSPE upregulates enterohormone gene expression and content, as well as the pan-endocrine marker chromogranin A. GSPE also modulates the temporal gene expression profile of early and late transcription factors involved in L-cell differentiation. Furthermore, GSPE upregulates goblet cell (Muc2) and enterocyte (sucraseisomaltase) markers, while downregulating stem cell markers (Lgr5+). Although EC and GA modified enterohormone release, they do not reproduce GSPE effects on transcription factor's profile. CONCLUSIONS This study shows the potential role of GSPE in promoting enteroendocrine differentiation, effect that is not mediated by EC or GA.
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Affiliation(s)
- Àngela Casanova-Martí
- MoBioFood Research Group, Departament de Bioquímica i Biotecnologia, Universitat Rovira i Virgili, C/Marcel·li Domingo 1, Tarragona, 43007, Spain
| | - Noemi González-Abuín
- Section for Nutrition Research, Department of Metabolism, Digestion, and Reproduction, Hammersmith Hospital, Imperial College London, London, W12 0NN, UK
| | - Joan Serrano
- MoBioFood Research Group, Departament de Bioquímica i Biotecnologia, Universitat Rovira i Virgili, C/Marcel·li Domingo 1, Tarragona, 43007, Spain
| | - Maria Teresa Blay
- MoBioFood Research Group, Departament de Bioquímica i Biotecnologia, Universitat Rovira i Virgili, C/Marcel·li Domingo 1, Tarragona, 43007, Spain
| | - Ximena Terra
- MoBioFood Research Group, Departament de Bioquímica i Biotecnologia, Universitat Rovira i Virgili, C/Marcel·li Domingo 1, Tarragona, 43007, Spain
| | - Gary Frost
- Section for Nutrition Research, Department of Metabolism, Digestion, and Reproduction, Hammersmith Hospital, Imperial College London, London, W12 0NN, UK
| | - Montserrat Pinent
- MoBioFood Research Group, Departament de Bioquímica i Biotecnologia, Universitat Rovira i Virgili, C/Marcel·li Domingo 1, Tarragona, 43007, Spain
| | - Anna Ardévol
- MoBioFood Research Group, Departament de Bioquímica i Biotecnologia, Universitat Rovira i Virgili, C/Marcel·li Domingo 1, Tarragona, 43007, Spain
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Xing L, Zhang H, Qi R, Tsao R, Mine Y. Recent Advances in the Understanding of the Health Benefits and Molecular Mechanisms Associated with Green Tea Polyphenols. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:1029-1043. [PMID: 30653316 DOI: 10.1021/acs.jafc.8b06146] [Citation(s) in RCA: 275] [Impact Index Per Article: 55.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Tea, leaf, or bud from the plant Camellia sinensis, make up some of the beverages popularly consumed in different parts of the world as green tea, oolong tea, or black tea. More particularly, as a nonfermented tea, green tea has gained more renown because of the significant health benefits assigned to its rich content in polyphenols. As a main constituent, green tea polyphenols were documented for their antioxidant, anti-inflammation, anticancer, anticardiovascular, antimicrobial, antihyperglycemic, and antiobesity properties. Recent reports demonstrate that green tea may exert a positive effect on the reduction of medical chronic conditions such as cardiovascular disease, cancer, Alzheimer's disease, Parkinson's disease, and diabetes. The health benefits of green teas, in particular EGCG, are widely investigated, and these effects are known to be primarily associated with the structure and compositions of its polyphenols. This Review focuses on the diverse constituents of green tea polyphenols and their molecular mechanisms from the perspective of their potential therapeutic function. Recent advances of green tea polyphenols on their bioavailability, bioaccessibility, and microbiota were also summarized in this article. Dietary supplementation with green tea represents an attractive alternative toward promoting human health.
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Affiliation(s)
- Lujuan Xing
- Department of Food Science , University of Guelph , Guelph , Ontario N1G 2W1 , Canada
- Key Lab of Meat Processing and Quality Control, College of Food Science and Technology , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , China
| | - Hua Zhang
- Guelph Food Research Centre, Agriculture and Agri-Food Canada , 93 Stone Road West , Guelph , Ontario N1G 5C9 , Canada
| | - Ruili Qi
- Department of Food Science , University of Guelph , Guelph , Ontario N1G 2W1 , Canada
| | - Rong Tsao
- Guelph Food Research Centre, Agriculture and Agri-Food Canada , 93 Stone Road West , Guelph , Ontario N1G 5C9 , Canada
| | - Yoshinori Mine
- Department of Food Science , University of Guelph , Guelph , Ontario N1G 2W1 , Canada
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Ebrahimi A, Bondarian F, Mahjoubi F, Hervan E, Gonbad R. Evaluation of phytochemical content of white tea clone 100 and changes the expression of tumor suppressor genes on colorectal cancer cell line HCT116. Pharmacognosy Res 2019. [DOI: 10.4103/pr.pr_39_19] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Nabavi SF, Atanasov AG, Khan H, Barreca D, Trombetta D, Testai L, Sureda A, Tejada S, Vacca RA, Pittalà V, Gulei D, Berindan-Neagoe I, Shirooie S, Nabavi SM. Targeting ubiquitin-proteasome pathway by natural, in particular polyphenols, anticancer agents: Lessons learned from clinical trials. Cancer Lett 2018; 434:101-113. [PMID: 30030139 DOI: 10.1016/j.canlet.2018.07.018] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 06/21/2018] [Accepted: 07/12/2018] [Indexed: 12/14/2022]
Abstract
The ubiquitin-proteasome pathway (UPP) is the main non-lysosomal proteolytic system responsible for degradation of most intracellular proteins, specifically damaged and regulatory proteins. The UPP is implicated in all aspects of the cellular metabolic networks including physiological or pathological conditions. Alterations in the components of the UPP can lead to stabilization of oncoproteins or augmented degradation of tumour suppressor favouring cancer appearance and progression. Polyphenols are natural compounds that can modulate proteasome activity or the expression of proteasome subunits. All together and due to the pleiotropic functions of UPP, there is a great interest in this proteasome system as a promising therapeutic target for the development of novel anti-cancer drugs. In the present review, the main features of the UPP and its implication in cancer development and progression are described, highlighting the importance of bioactive polyphenols that target the UPP as potential anti-cancer agents.
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Affiliation(s)
- Seyed Fazel Nabavi
- Applied Biotechnology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Atanas G Atanasov
- The Institute of Genetics and Animal Breeding, Polish Academy of Sciences, Postępu 36A, Jastrzębiec, 05-552, Magdalenka, Poland; Department of Pharmacognosy, Faculty of Life Sciences, University of Vienna, Althanstrasse 14, A-1090, Vienna, Austria
| | - Haroon Khan
- Department of Pharmacy, Abdul Wali Khan University, Mardan, Pakistan
| | - Davide Barreca
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98168, Messina, Italy.
| | - Domenico Trombetta
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, 98168, Messina, Italy
| | - Lara Testai
- Department of Pharmacy, University of Pisa, Pisa, Italy; Interdepartmental Center of Nutrafood, University of Pisa, Pisa, Italy
| | - Antoni Sureda
- Research Group on Community Nutrition and Oxidative Stress (NUCOX) and CIBEROBN (Physiopathology of Obesity and Nutrition CB12/03/30038), University of Balearic Islands, Palma de Mallorca, E-07122, Balearic Islands, Spain
| | - Silvia Tejada
- Laboratory of Neurophysiology, Department of Biology, University of Balearic Islands, Ctra. Valldemossa, Km 7,5, Ed, Guillem Colom, 07122, Balearic Islands, Spain
| | - Rosa Anna Vacca
- Institute of Biomembranes, Bioenergetics and Molecular Biotechnologies, Italian National Council of Research, Bari, Italy
| | - Valeria Pittalà
- Department of Drug Sciences, University of Catania, Viale A. Doria 6, 95125, Catania, Italy
| | - Diana Gulei
- MEDFUTURE-Research Center for Advanced Medicine, "Iuliu-Hatieganu" University of Medicine and Pharmacy, Marinescu 23 Street, 400337, Cluj-Napoca, Romania
| | - Ioana Berindan-Neagoe
- MEDFUTURE-Research Center for Advanced Medicine, "Iuliu-Hatieganu" University of Medicine and Pharmacy, Marinescu 23 Street, 400337, Cluj-Napoca, Romania; Research Center for Functional Genomics, Biomedicine and Translational Medicine, "Iuliu Hatieganu" University of Medicine and Pharmacy, 23 Marinescu Street, 400337, Cluj-Napoca, Romania; Department of Functional Genomics and Experimental Pathology, The Oncology Institute "Prof. Dr. Ion Chiricuta", Republicii 34 Street, 400015, Cluj-Napoca, Romania
| | - Samira Shirooie
- Department of Pharmacology, Faculty of Pharmacy, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Seyed Mohammad Nabavi
- Applied Biotechnology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran.
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Hao X, Xiao H, Ju J, Lee MJ, Lambert JD, Yang CS. Green Tea Polyphenols Inhibit Colorectal Tumorigenesis in Azoxymethane-Treated F344 Rats. Nutr Cancer 2017; 69:623-631. [PMID: 28323438 DOI: 10.1080/01635581.2017.1295088] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
In studying the cancer-preventive activities of green tea polyphenols, we previously demonstrated that dietary administration of polyphenon E (PPE) inhibited the formation of aberrant crypt foci (ACF) in the colon of azoxymethane (AOM)-treated F344 rats. Herein, we reported cancer-preventive activity of PPE using colorectal cancer as an end point. F344 rats were given two weekly injections of AOM, and then maintained on a 20% high-fat diet with or without 0.24% PPE for 34 wk. In the control group, 83% of rats developed colorectal tumors. Dietary PPE treatment significantly increased the plasma and colonic levels of tea polyphenols, and decreased tumor multiplicity and tumor size. Histological analysis indicated that PPE significantly decreased the incidence of adenocarcinoma, and the multiplicity of adenocarcinoma as well as the multiplicity of adenoma. PPE treatment significantly decreased plasma levels of proinflammatory eicosanoids, prostaglandin E2, and leukotriene B4. It also decreased β-catenin nuclear expression, induced apoptosis, and increased expression levels of RXRα, β, and γ in adenocarcinomas. In conclusion, our results convincingly demonstrated the inhibitory effects of orally administered PPE on colon carcinogenesis in AOM-treated rats and suggested possible biomarkers for the biological effects of green tea polyphenols.
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Affiliation(s)
- Xingpei Hao
- a Susan Lehman Cullman Laboratory for Cancer Research, Department of Chemical Biology , Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey , Piscataway , New Jersey , USA.,b Pathology and Histotechnology Laboratory , Leidos Biomedical Research Institute Inc., Frederick National Laboratory for Cancer Research , Frederick , Maryland , USA
| | - Hang Xiao
- a Susan Lehman Cullman Laboratory for Cancer Research, Department of Chemical Biology , Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey , Piscataway , New Jersey , USA.,c Department of Food Science , University of Massachusetts , Amherst , Massachusetts , USA
| | - Jihyeung Ju
- a Susan Lehman Cullman Laboratory for Cancer Research, Department of Chemical Biology , Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey , Piscataway , New Jersey , USA.,d Department of Food and Nutrition , Chungbuk National University , Cheongju , Chungbuk , Korea
| | - Mao-Jung Lee
- a Susan Lehman Cullman Laboratory for Cancer Research, Department of Chemical Biology , Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey , Piscataway , New Jersey , USA
| | - Joshua D Lambert
- a Susan Lehman Cullman Laboratory for Cancer Research, Department of Chemical Biology , Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey , Piscataway , New Jersey , USA.,e Department of Food Science , Center for Molecular Toxicology and Carcinogenesis, The Pennsylvania State University , University Park , Pennsylvania , USA
| | - Chung S Yang
- a Susan Lehman Cullman Laboratory for Cancer Research, Department of Chemical Biology , Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey , Piscataway , New Jersey , USA
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Yang CS, Wang H. Cancer Preventive Activities of Tea Catechins. Molecules 2016; 21:E1679. [PMID: 27941682 PMCID: PMC6273642 DOI: 10.3390/molecules21121679] [Citation(s) in RCA: 120] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Revised: 11/18/2016] [Accepted: 11/24/2016] [Indexed: 02/06/2023] Open
Abstract
Catechins are widely occurring in our diet and beverages. The cancer-preventive activities of catechins have been extensively studied. Of these, (-)-epigallocatechin-3-gallate (EGCG), the principal catechin in green tea, has received the most attention. The inhibitory activities of tea catechins against carcinogenesis and cancer cell growth have been demonstrated in a large number of laboratory studies. Many mechanisms for modulating cancer signaling and metabolic pathways have been proposed based on numerous studies in cell lines with EGCG, the most active tea catechin. Nevertheless, it is not known whether many of these mechanisms indeed contribute to the anti-cancer activities in animals and in humans. Human studies have provided some results for the cancer preventive activities of tea catechins; however, the activities are not strong. This article reviews the cancer preventive activities and mechanisms of action of tea catechins involving their redox activities, biochemical properties and binding to key enzymes or signal transduction proteins. These mechanisms lead to suppression of cell proliferation, increased apoptosis and inhibition of angiogenesis. The relevance of the proposed mechanisms for cancer prevention are assessed in the light of the situation in vivo. The potential and possible problems in the application of tea and tea-derived products for cancer prevention are discussed.
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Affiliation(s)
- Chung S Yang
- Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, Piscataway, NJ 08854-8020, USA.
| | - Hong Wang
- Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, Piscataway, NJ 08854-8020, USA.
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Ahmed RSI, Liu G, Renzetti A, Farshi P, Yang H, Soave C, Saed G, El-Ghoneimy AA, El-Banna HA, Foldes R, Chan TH, Dou QP. Biological and Mechanistic Characterization of Novel Prodrugs of Green Tea Polyphenol Epigallocatechin Gallate Analogs in Human Leiomyoma Cell Lines. J Cell Biochem 2016; 117:2357-69. [DOI: 10.1002/jcb.25533] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Accepted: 03/03/2016] [Indexed: 12/13/2022]
Affiliation(s)
- Reda Saber Ibrahim Ahmed
- Barbara Ann Karmanos Cancer Institute, and Departments of Oncology, Pharmacology and Pathology, School of Medicine; Wayne State University; Detroit Michigan
- Faculty of Veterinary Medicine, Department of Pharmacology; South Valley University; Qena Egypt
| | - Gang Liu
- Barbara Ann Karmanos Cancer Institute, and Departments of Oncology, Pharmacology and Pathology, School of Medicine; Wayne State University; Detroit Michigan
| | - Andrea Renzetti
- Department of Chemistry; McGill University; Montreal Quebec Canada
| | - Pershang Farshi
- Barbara Ann Karmanos Cancer Institute, and Departments of Oncology, Pharmacology and Pathology, School of Medicine; Wayne State University; Detroit Michigan
| | - Huanjie Yang
- Barbara Ann Karmanos Cancer Institute, and Departments of Oncology, Pharmacology and Pathology, School of Medicine; Wayne State University; Detroit Michigan
| | - Claire Soave
- Barbara Ann Karmanos Cancer Institute, and Departments of Oncology, Pharmacology and Pathology, School of Medicine; Wayne State University; Detroit Michigan
| | - Ghassan Saed
- Departments of Obstetrics & Gynecology and Anatomy & Cell Biology; School of Medicine; Wayne State University; Detroit Michigan
| | | | - Hossny Awad El-Banna
- Faculty of Veterinary Medicine, Department of Pharmacology; Cairo University; Giza Egypt
| | - Robert Foldes
- Viteava Pharmaceuticals Inc.; Toronto Ontario Canada
| | - Tak-Hang Chan
- Department of Chemistry; McGill University; Montreal Quebec Canada
| | - Q. Ping Dou
- Barbara Ann Karmanos Cancer Institute, and Departments of Oncology, Pharmacology and Pathology, School of Medicine; Wayne State University; Detroit Michigan
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Le Gal K, Ibrahim MX, Wiel C, Sayin VI, Akula MK, Karlsson C, Dalin MG, Akyürek LM, Lindahl P, Nilsson J, Bergo MO. Antioxidants can increase melanoma metastasis in mice. Sci Transl Med 2015; 7:308re8. [DOI: 10.1126/scitranslmed.aad3740] [Citation(s) in RCA: 401] [Impact Index Per Article: 44.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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15
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Favourable effects of grape seed extract on intestinal epithelial differentiation and barrier function in IL10-deficient mice. Br J Nutr 2015; 114:15-23. [DOI: 10.1017/s0007114515001415] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The impairment in the rate of cell proliferation and differentiation leads to a negative consequence on the renewal of the intestinal epithelium, which is the aetiological factor of a number of digestive diseases. Grape seed extract (GSE), a rich source of proanthocyanidins, is known for its beneficial health effects. The present study evaluated the beneficial effects of GSE on colonic cell differentiation and barrier function in IL10-deficient mice. Female mice aged 6 weeks were randomised into two groups and given drinking-water containing 0 or 0·1 % GSE (w/v) for 12 weeks. GSE supplementation decreased serum TNF-α level and intestinal permeability, and increased the colonic goblet cell density that was associated with increased mRNA expression of mucin (Muc)-2. Immunohistochemical analyses showed lower accumulation of β-catenin in the crypts of colon tissues of the GSE-supplemented mice, which was associated with a decreased mRNA expression of two downstream effectors of Wingless and Int (Wnt)/catenin signalling, myelocytomatosis oncogene protein (Myc) and cyclin D1 (Ccnd1). Consistently, GSE supplementation decreased the number of colonic proliferating cell nuclear antigen-positive cells, a well-known cell proliferation marker, and a weakened extracellular signal-regulated kinases 1 and 2 (ERK1/2) signalling. In summary, these data indicate that supplementation of 0·1 % GSE for 12 weeks improved gut barrier function and colonic cell differentiation in the IL10-deficient mice probably via inhibiting Wnt/β-catenin pathway.
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Mangerich A, Dedon PC, Fox JG, Tannenbaum SR, Wogan GN. Chemistry meets biology in colitis-associated carcinogenesis. Free Radic Res 2013; 47:958-86. [PMID: 23926919 PMCID: PMC4316682 DOI: 10.3109/10715762.2013.832239] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The intestine comprises an exceptional venue for a dynamic and complex interplay of numerous chemical and biological processes. Here, multiple chemical and biological systems, including the intestinal tissue itself, its associated immune system, the gut microbiota, xenobiotics, and metabolites meet and interact to form a sophisticated and tightly regulated state of tissue homoeostasis. Disturbance of this homeostasis can cause inflammatory bowel disease (IBD)-a chronic disease of multifactorial etiology that is strongly associated with increased risk for cancer development. This review addresses recent developments in research into chemical and biological mechanisms underlying the etiology of inflammation-induced colon cancer. Beginning with a general overview of reactive chemical species generated during colonic inflammation, the mechanistic interplay between chemical and biological mediators of inflammation, the role of genetic toxicology, and microbial pathogenesis in disease development are discussed. When possible, we systematically compare evidence from studies utilizing human IBD patients with experimental investigations in mice. The comparison reveals that many strong pathological and mechanistic correlates exist between mouse models of colitis-associated cancer, and the clinically relevant situation in humans. We also summarize several emerging issues in the field, such as the carcinogenic potential of novel inflammation-related DNA adducts and genotoxic microbial factors, the systemic dimension of inflammation-induced genotoxicity, and the complex role of genome maintenance mechanisms during these processes. Taken together, current evidence points to the induction of genetic and epigenetic alterations by chemical and biological inflammatory stimuli ultimately leading to cancer formation.
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Affiliation(s)
- Aswin Mangerich
- Department of Biological Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139
- Department of Biology, Molecular Toxicology Group, University of Konstanz, D-78457 Konstanz, Germany
| | - Peter C. Dedon
- Department of Biological Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139
- Center for Environmental Health Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139
| | - James G. Fox
- Department of Biological Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139
- Division of Comparative Medicine, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139
- Center for Environmental Health Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139
| | - Steven R. Tannenbaum
- Department of Biological Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139
- Center for Environmental Health Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139
| | - Gerald N. Wogan
- Department of Biological Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139
- Center for Environmental Health Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139
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Hu Y, McIntosh GH, Le Leu RK, Nyskohus LS, Woodman RJ, Young GP. Combination of selenium and green tea improves the efficacy of chemoprevention in a rat colorectal cancer model by modulating genetic and epigenetic biomarkers. PLoS One 2013; 8:e64362. [PMID: 23717604 PMCID: PMC3662759 DOI: 10.1371/journal.pone.0064362] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Accepted: 04/12/2013] [Indexed: 02/08/2023] Open
Abstract
Dietary supplementation of selenium and green tea holds promise in cancer prevention. In this study, we evaluated the efficacies of selenium and green tea administered individually and in combination against colorectal cancer in an azoxymethane (AOM)-induced rat colonic carcinogenesis model and determined the underlying mechanisms of the protection. Four-week old Sprague-Dawley male rats were fed with diets containing 0.5% green tea extract, 1 ppm selenium as selenium-enriched milk protein, or combination of 1 ppm selenium and 0.5% green tea extract. Animals received 2 AOM (15 mg/kg) treatments to induce colonic oncogenesis. Rats were killed 8 or 30 wk later after the last AOM to examine the effect of dietary intervention on aberrant crypt foci (ACF) formation or tumor development. On sacrifice, colons were examined for ACF and tumors, the mRNA levels of SFRP5 and Cyclin D1, and the proteins levels of ß-catenin, COX-2, Ki-67, DNMT1 and acetyl histone H3. The combination of selenium and green tea resulted in a significant additive inhibition of large ACF formation, this effect was greater than either selenium or green tea alone, P<0.01; the combination also had a significant additive inhibition effect on all tumor endpoints, the effect of the combination diet on tumor incidence, multiplicity and size was greater than selenium or green tea alone, P<0.01. Rats fed the combination diet showed marked reduction of DNMT1 expression and induction of histone H3 acetylation, which were accompanied by restoration of SFRP5 mRNA in normal-appearing colonic crypts. The combination diet also significantly reduced ß-catenin nuclear translocation, Cyclin D1 expression and cell proliferation. These data show, for the first time, that combination of selenium and green tea is more effective in suppressing colorectal oncogenesis than either agent alone. The preventive effect is associated with regulation of genetic and epigenetic biomarkers implicated in colonic carcinogenesis.
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Affiliation(s)
- Ying Hu
- Flinders Centre for Innovation in Cancer, Flinders University of South Australia, Adelaide, Australia.
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Ju J, Kwak Y, Hao X, Yang CS. Inhibitory effects of calcium against intestinal cancer in human colon cancer cells and Apc(Min/+) mice. Nutr Res Pract 2012. [PMID: 23198018 PMCID: PMC3506870 DOI: 10.4162/nrp.2012.6.5.396] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The aim of the study was to investigate the inhibitory effects of calcium against intestinal cancer in vitro and in vivo. We first investigated the effects of calcium treatment in HCT116 and HT29 human colon cancer cells. At the concentration range of 0.8-2.4 mM, calcium significantly inhibited cell growth (by 9-29%), attachment (by 12-26%), invasion (by 15-31%), and migration (by 19-61%). An immunofluorescence microscope analysis showed that the treatment with calcium (1.6 mM) for 24 h increased plasma membrane β-catenin but decreased nuclear β-catenin levels in HT29 cells. We then investigated the effect of dietary calcium on intestinal tumorigenesis in ApcMin/+ mice. Mice received dietary treatment starting at 6 weeks of age for the consecutive 8 weeks. The basal control diet contained high-fat (20% mixed lipids by weight) and low-calcium (1.4 mg/g diet) to mimic the average Western diet, while the treatment diet contained an enriched level of calcium (5.2 mg calcium/g diet). The dietary calcium treatment decreased the total number of small intestinal tumors (by 31.4%; P < 0.05). The largest decrease was in tumors which were ≥ 2 mm in diameter, showing a 75.6% inhibition in the small intestinal tumor multiplicity (P < 0.001). Immunohistochemical analysis showed significantly reduced nuclear staining of β-catenin (expressed as nuclear positivity), but increased plasma membrane staining of β-catenin, in the adenomas from the calcium-treated groups in comparison to those from the control group (P < 0.001). These results demonstrate intestinal cancer inhibitory effects of calcium both in human colon cancer cells and ApcMin/+ mice. The decreased β-catenin nuclear localization caused by the calcium treatment may contribute to the inhibitory action.
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Affiliation(s)
- Jihyeung Ju
- Department of Food and Nutrition, Chungbuk National University, 52 Naesudong-ro, Heungdeok-gu, Cheongju 361-763, Korea
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Kadaveru K, Protiva P, Greenspan EJ, Kim YI, Rosenberg DW. Dietary methyl donor depletion protects against intestinal tumorigenesis in Apc(Min/+) mice. Cancer Prev Res (Phila) 2012; 5:911-20. [PMID: 22677908 DOI: 10.1158/1940-6207.capr-11-0544] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Despite recent population data, the influence of dietary folate supplementation on colon cancer risk remains controversial. This study examines the effects of folate deficiency, in combination with choline, methionine, and vitamin B12 depletion, on intestinal tumorigenesis in Apc(Min/+) mice. Methyl donor sufficient (MDS) and deficient (MDD) diets were started at five or 10 weeks of age and tumors evaluated at 16 weeks. MDD suppressed intestinal tumor formation in Apc(Min/+) mice (~80%) when started at five weeks of age. The protective effect was lost when MDD was initiated at 10 weeks of age, indicating an important time dependency on cancer suppression. Concomitant with cancer protection, MDD restricted body weight gain. Therefore, a second study was conducted in which MDS was given ad libitum or pair-fed with MDD. Although small intestinal tumors were reduced 54% in pair-fed MDS mice, MDD caused a further reduction (96%). In colon, although MDD did not affect tumor numbers, tumor size was reduced. Gene expression profiling of normal-appearing colonic mucosa after 11 weeks on MDD identified a total of 493 significantly downregulated genes relative to the MDS group. Pathway analysis placed many of these genes within general categories of inflammatory signaling and cell-cycle regulation, consistent with recently published human data obtained during folate depletion. Further studies are warranted to investigate the complex interplay of methyl donor status and cancer protection in high-risk populations.
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Affiliation(s)
- Krishna Kadaveru
- Molecular Medicine, University of Connecticut Health Center, Farmington, CT 06030, USA
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20
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Li G, Lee MJ, Liu AB, Yang Z, Lin Y, Shih WJ, Yang CS. The antioxidant and anti-inflammatory activities of tocopherols are independent of Nrf2 in mice. Free Radic Biol Med 2012; 52:1151-8. [PMID: 22226829 DOI: 10.1016/j.freeradbiomed.2011.12.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/17/2011] [Revised: 12/08/2011] [Accepted: 12/08/2011] [Indexed: 01/28/2023]
Abstract
The present study investigated the antioxidant and anti-inflammatory actions of tocopherols in mice and determined whether the nuclear factor (erythroid-derived 2)-like 2 (Nrf2) is involved in these activities. A mixture of tocopherols (γ-TmT) that is rich in γ-tocopherol was used. Nrf2 knockout (Nrf2 -/-) and wild-type mice were maintained on 0.03, 0.1, or 0.3% γ-TmT-enriched diet starting 2 weeks before the administration of dextran sulfate sodium (DSS) in drinking water (for 1 week, to induce colonic inflammation), until the termination of the experiment at 3 days after the DSS treatment. Dietary γ-TmT dose dependently lowered the levels of 8-oxo-deoxyguanosine, nitrotyrosine, inflammation index, and leukocyte infiltration in colon tissues, as well as 8-isoprostane and prostaglandin E2 in the serum, in both Nrf2 (-/-) and wild-type mice. No significant difference on the inhibitory actions of γ-TmT between the Nrf2 (-/-) and the wild-type mice was observed. The γ-TmT treatment significantly increased the serum levels of γ- and δ-tocopherols. Interestingly, the serum levels of tocopherol metabolites, specifically the γ- and δ-forms of carboxymethylbutyl hydroxychroman and carboxyethyl hydroxychroman, in Nrf2 (-/-) mice were significantly higher than those in wild-type mice. These findings suggest that the antioxidant and anti-inflammatory activities of γ-TmT in the colon are mostly due to the direct action of tocopherols in trapping reactive oxygen and nitrogen species, independent of the antioxidant enzymes and anti-inflammatory proteins that are regulated by Nrf2; however, Nrf2 knockout appears to affect the serum levels of tocopherol metabolites.
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Affiliation(s)
- Guangxun Li
- Department of Chemical Biology and Center for Cancer Prevention Research, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, 164 Frelinghuysen Road, Piscataway, NJ 08854, USA
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21
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Ricciardiello L, Bazzoli F, Fogliano V. Phytochemicals and colorectal cancer prevention--myth or reality? Nat Rev Gastroenterol Hepatol 2011; 8:592-6. [PMID: 21894197 DOI: 10.1038/nrgastro.2011.149] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Chemoprevention of colorectal cancer has been the focus of intensive research for more than two decades. Epidemiological evidence has shown a small, but significant association between fruit and vegetable intake and a reduction in colorectal cancer risk. In vitro and animal data have also demonstrated that many dietary phytochemicals have potent chemopreventive activities. However, in humans, single-agent compounds have yielded conflicting results. A key concept is that dietary phytochemicals exert beneficial effects at low concentrations when working in synergy with each other. As the gut microflora evolved in an environment rich in dietary fiber and phytochemicals, the rapid shift towards a Western diet creates an environment in which the gut is more vulnerable to carcinogens, genetic alterations and inflammation. As enforcing dietary interventions on large populations is not realistic, we believe future chemopreventive work should focus on delivering phytochemical mixtures that target the multiple molecular events involved in colorectal carcinogenesis.
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Affiliation(s)
- Luigi Ricciardiello
- Department of Clinical Medicine, University of Bologna, Via Massarenti 9, Bologna 40138, Italy.
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22
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Yang CS, Wang H. Mechanistic issues concerning cancer prevention by tea catechins. Mol Nutr Food Res 2011; 55:819-31. [PMID: 21538856 DOI: 10.1002/mnfr.201100036] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2011] [Revised: 03/04/2011] [Accepted: 03/24/2011] [Indexed: 12/12/2022]
Abstract
The cancer preventive activities of tea (Camellia sinensis, Theaceae) have been demonstrated in animal models for cancers at different organ sites and suggested by some epidemiological studies. Many mechanisms for cancer prevention have been proposed based on studies in cell lines, which demonstrated the modulation of signal transduction and metabolic pathways by (-)-epigallocatechin-3-gallate (EGCG), the most abundant and active polyphenol in green tea. These molecular events may result in cellular changes, such as enhancement of apoptosis, suppression of cell proliferation, and inhibition of angiogenesis. Nevertheless, it is not known whether these are the molecular mechanisms of inhibition of carcinogenesis in animals and humans. This article discusses the key issues involved in extrapolating results from cell line studies to mechanistic information in vivo and in translating animal studies to human cancer prevention.
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Affiliation(s)
- Chung S Yang
- Department of Chemical Biology and Center for Cancer Prevention Research, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, Piscataway, NJ 08854-8020, USA.
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Cancer prevention by tea: Evidence from laboratory studies. Pharmacol Res 2011; 64:113-22. [PMID: 21397027 DOI: 10.1016/j.phrs.2011.03.001] [Citation(s) in RCA: 158] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2010] [Revised: 03/02/2011] [Accepted: 03/02/2011] [Indexed: 12/30/2022]
Abstract
The cancer preventive activities of tea (Camellia sinensis Theaceae) have been studied extensively. Inhibition of tumorigenesis by green tea extracts and tea polyphenols has been demonstrated in different animal models, including those for cancers of the skin, lung, oral cavity, esophagus, stomach, small intestine, colon, bladder, liver, pancreas, prostate, and mammary glands. Many studies in cell lines have demonstrated the modulation of signal transduction and metabolic pathways by (-)-epigallocatechin-3-gallate (EGCG), the most abundant and active polyphenol in green tea. These molecular events can result in cellular changes, such as enhancement of apoptosis, suppression of cell proliferation, and inhibition of angiogenesis. Nevertheless, the molecular mechanisms of inhibition of carcinogenesis in animals and humans remain to be further investigated. Future research directions in this area are discussed.
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Green tea prevents down-regulation of gap junction intercellular communication in human keratinocytes treated with PMA. Eur Arch Otorhinolaryngol 2010; 268:885-92. [DOI: 10.1007/s00405-010-1411-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2010] [Accepted: 10/13/2010] [Indexed: 10/18/2022]
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Suppression of Met activation in human colon cancer cells treated with (-)-epigallocatechin-3-gallate: minor role of hydrogen peroxide. Biochem Biophys Res Commun 2009; 389:527-30. [PMID: 19744467 DOI: 10.1016/j.bbrc.2009.09.019] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2009] [Accepted: 09/04/2009] [Indexed: 12/16/2022]
Abstract
Colorectal cancer is the second leading cause of cancer-related deaths in the U.S. Met, the receptor for hepatocyte growth factor (HGF), is over-expressed in colon tumors and is associated with poor prognosis. Recently, the green tea polyphenol (-)-epigallocatechin gallate (EGCG) was reported to suppress Met activation in breast cancer cells. However, the possible confounding effect of hydrogen peroxide (H(2)O(2)), produced when EGCG is added to cell culture media, was not assessed. In the present study, the human colon cancer cell lines HCT116 and HT29 were used to examine the relationships between Met activation, EGCG treatment, and H(2)O(2) generation. At concentrations of 0.5, 1, and 5 microM, EGCG suppressed markedly the activation of Met in the presence of HGF. Concentrations of 10muM EGCG and below generated low amounts of H(2)O(2) (<1.5 microM), whereas higher H(2)O(2) concentrations (>5 microM) were required to directly increase the phosphorylation of Met. Moreover, suppression of Met activation by EGCG occurred in the presence or absence of catalase, suggesting that such effects were not an 'artifact' of H(2)O(2) generated from EGCG in cell culture media. We conclude that EGCG might be a beneficial therapeutic agent in the colon, inhibiting Met signaling and helping to attenuate tumor spread/metastasis, independent of H(2)O(2)-related mechanisms.
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Yang CS, Wang X, Lu G, Picinich SC. Cancer prevention by tea: animal studies, molecular mechanisms and human relevance. Nat Rev Cancer 2009; 9:429-39. [PMID: 19472429 PMCID: PMC2829848 DOI: 10.1038/nrc2641] [Citation(s) in RCA: 801] [Impact Index Per Article: 53.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Extracts of tea, especially green tea, and tea polyphenols have been shown to inhibit the formation and development of tumours at different organ sites in animal models. There is considerable evidence that tea polyphenols, in particular (-)-epigallocatechin-3-gallate, inhibit enzyme activities and signal transduction pathways, resulting in the suppression of cell proliferation and enhancement of apoptosis, as well as the inhibition of cell invasion,angiogenesis and metastasis. Here, we review these biological activities and existing data relating tea consumption to human cancer risk in an attempt to understand the potential use of tea for cancer prevention.
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Affiliation(s)
- Chung S Yang
- Susan Lehman Cullman Laboratory of Cancer Research, Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, 164 Frelinghuysen Road, Piscataway, NJ 08854-8020, USA.
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27
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Bode AM, Dong Z. Epigallocatechin 3-gallate and green tea catechins: United they work, divided they fail. Cancer Prev Res (Phila) 2009; 2:514-7. [PMID: 19470792 DOI: 10.1158/1940-6207.capr-09-0083] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Ann M Bode
- The Hormel Institute, Austin, Minnesota 55912, USA
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28
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Cai H, Brown K, Steward WP, Gescher AJ. Determination of 3′,4′,5′,5,7-pentamethoxyflavone in the plasma and intestinal mucosa of mice by HPLC with UV detection. Biomed Chromatogr 2009; 23:335-9. [DOI: 10.1002/bmc.1120] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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29
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Ju J, Hao X, Lee MJ, Lambert JD, Lu G, Xiao H, Newmark HL, Yang CS. A gamma-tocopherol-rich mixture of tocopherols inhibits colon inflammation and carcinogenesis in azoxymethane and dextran sulfate sodium-treated mice. Cancer Prev Res (Phila) 2009; 2:143-52. [PMID: 19155443 DOI: 10.1158/1940-6207.capr-08-0099] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
We investigated the effects of a gamma-tocopherol-rich mixture of tocopherols (gamma-TmT, containing 57% gamma-T, 24% delta-T, and 13% alpha-T) on colon carcinogenesis in azoxymethane (AOM)/dextran sulfate sodium (DSS)-treated mice. In experiment 1, 6-week-old male CF-1 mice were given a dose of AOM (10 mg/kg body weight, i.p.), and 1 week later, 1.5% DSS in drinking water for 1 week. The mice were maintained on either a gamma-TmT (0.3%)-enriched or a standard AIN93M diet, starting 1 week before the AOM injection, until the termination of experiment. In the AOM/DSS-treated mice, dietary gamma-TmT treatment resulted in a significantly lower colon inflammation index (52% of the control) on day 7 and number of colon adenomas (9% of the control) on week 7. gamma-TmT treatment also resulted in higher apoptotic index in adenomas, lower prostaglandin E2, leukotriene B4, and nitrotyrosine levels in the colon, and lower prostaglandin E2, leukotriene B4, and 8-isoprostane levels in the plasma on week 7. Some of the decreases were observed even on day 7. In experiment 2 with AOM/DSS- treated mice sacrificed on week 21, dietary 0.17% or 0.3% gamma-TmT treatment, starting 1 week before the AOM injection, significantly inhibited adenocarcinoma and adenoma formation in the colon (to 17-33% of the control). Dietary 0.3% gamma-TmT that was initiated after DSS treatment also exhibited a similar inhibitory activity. The present study showed that gamma-TmT effectively inhibited colon carcinogenesis in AOM/DSS-treated mice, and the inhibition may be due to the apoptosis-inducing, anti-inflammatory, antioxidative, and reactive nitrogen species-trapping activities of tocopherols.
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Affiliation(s)
- Jihyeung Ju
- Susan Lehman Cullman Laboratory for Cancer Research, Department of Chemical Biology, and Center for Cancer Prevention Research, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, Piscataway, New Jersey, USA
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Yang CS, Lambert JD, Sang S. Antioxidative and anti-carcinogenic activities of tea polyphenols. Arch Toxicol 2008; 83:11-21. [PMID: 19002670 DOI: 10.1007/s00204-008-0372-0] [Citation(s) in RCA: 202] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2008] [Accepted: 10/02/2008] [Indexed: 10/21/2022]
Abstract
Tea (Camellia sinensis, Theaceace), a popular beverage consumed world-wide, has been studied for its preventive effects against cancer as well as cardiovascular, neurodegenerative, and other diseases. Most of the proposed beneficial effects have been attributed to the polyphenolic compounds in tea, but the nature of these activities and the molecular mechanisms of their actions remain unclear. Tea polyphenols are known to be strong antioxidants. Prevention of oxidative stress, modulation of carcinogen metabolism, and prevention of DNA damage have been suggested as possible cancer preventive mechanisms for tea and tea polyphenols. In this chapter, we discuss these topics in the light of biotransformation and bioavailability of tea polyphenols. We also review the preventive effects of tea polyphenols in animal models of carcinogenesis and some of the possible post-initiation mechanisms of action. Finally, we discuss the effects of tea consumption on cancer risk in humans. It is our aim to raise some of the unanswered questions regarding cancer prevention by tea and to stimulate further research in this area.
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Affiliation(s)
- Chung S Yang
- Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, 164 Frelinghuysen Road, Piscataway, NJ 08854, USA.
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Rajamanickam S, Agarwal R. Natural products and colon cancer: current status and future prospects. Drug Dev Res 2008; 69:460-471. [PMID: 19884979 DOI: 10.1002/ddr.20276] [Citation(s) in RCA: 115] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Carcinogenesis is a multistage process consisting of initiation, promotion and progression phases. Thus, the multistage sequence of events has many phases for prevention and intervention. Chemoprevention, a novel approach for controlling cancer, involves the use of specific natural products or synthetic chemical agents to reverse, suppress or prevent premalignancy before the development of invasive cancer. Several natural products, such as, grains, nuts, cereals, spices, fruits, vegetables, beverages, medicinal plants and herbs and their various phytochemical constituents including, phenolics, flavonoids, carotenoids, alkaloids, nitrogen containing as well as organosulfur compounds confer protective effects against wide range of cancers including colon cancer. Since diet has an important role in the etiology of colon cancer, dietary chemoprevention received attention for colon cancer prevention. However, identification of an agent with chemopreventive potential requires in vitro studies, efficacy and toxicity studies in animal models before embarking on human clinical trials. A brief introduction about colon cancer and the role of some recent natural products in colon cancer chemoprevention with respect to multiple molecular mechanisms in various in vitro, in vivo and clinical studies are described in this review.
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Affiliation(s)
- Subapriya Rajamanickam
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Colorado Denver, Denver, Colorado, USA
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Wali RK, Kunte DP, Koetsier JL, Bissonnette M, Roy HK. Polyethylene glycol-mediated colorectal cancer chemoprevention: roles of epidermal growth factor receptor and Snail. Mol Cancer Ther 2008; 7:3103-11. [PMID: 18790788 DOI: 10.1158/1535-7163.mct-08-0434] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Polyethylene glycol (PEG) is a clinically widely used agent with profound chemopreventive properties in experimental colon carcinogenesis. We reported previously that Snail/beta-catenin signaling may mediate the suppression of epithelial proliferation by PEG, although the upstream events remain unclear. We report herein the role of epidermal growth factor receptor (EGFR), a known mediator of Snail and overexpressed in approximately 80% of human colorectal cancers, on PEG-mediated antiproliferative and hence antineoplastic effects in azoxymethane (AOM) rats and HT-29 colon cancer cells. AOM rats were randomized to either standard diet or one with 10% PEG-3350 and euthanized 8 weeks later. The colonic samples were subjected to immunohistochemical or Western blot analyses. PEG decreased mucosal EGFR by 60% (P < 0.001). Similar PEG effects were obtained in HT-29 cells. PEG suppressed EGFR protein via lysosmal degradation with no change in mRNA levels. To show that EGFR antagonism per se was responsible for the antiproliferative effect, we inhibited EGFR by either pretreating cells with gefitinib or stably transfecting with EGFR-short hairpin RNA and measured the effect of PEG on proliferation. In either case, PEG effect was blunted, suggesting a vital role of EGFR. Flow cytometric analysis revealed that EGFR-short hairpin RNA cells, besides having reduced membrane EGFR, also expressed low Snail levels (40%), corroborating a strong association. Furthermore, in EGFR silenced cells, PEG effect on EGFR or Snail was muted, similar to that on proliferation. In conclusion, we show that EGFR is the proximate membrane signaling molecule through which PEG initiates antiproliferative activity with Snail/beta-catenin pathway playing the central intermediary function.
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Affiliation(s)
- Ramesh K Wali
- Feinberg School of Medicine at Northwestern University, Department of Internal Medicine, Evanston Northwestern Healthcare, 1001 University Place, Suite 314, Evanston, IL 60201, USA.
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Lambert JD, Kwon SJ, Ju J, Bose M, Lee MJ, Hong J, Hao X, Yang CS. Effect of genistein on the bioavailability and intestinal cancer chemopreventive activity of (-)-epigallocatechin-3-gallate. Carcinogenesis 2008; 29:2019-24. [PMID: 18684728 DOI: 10.1093/carcin/bgn182] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The green tea (Camellia sinensis) catechin, (-)-epigallocatechin-3-gallate (EGCG), has shown cancer-preventive activity in animal models. Previously, we have reported the bioavailability of EGCG in rats and mice. Here, we report that cotreatment of HT-29 human colon cancer cells with genistein (from soy) increased cytosolic EGCG by 2- to 5-fold compared with treatment with EGCG only. Inclusion of genistein, at non-cytotoxic concentrations, increased the growth inhibitory effects of EGCG against HT-29 cells (up to 2-fold at 20 microM genistein). Intragastric coadministration of EGCG (75 mg/kg) and genistein (200 mg/kg) to CF-1 mice resulted in an increase in plasma half-life (t(1/2) 148.7 +/- 16.4 versus 111.5 +/- 23.4 min) and exposure (AUC(0-->infinity) 183.9 +/- 20.2 versus 125.8 +/- 26.4 microg/ml x min) of EGCG. Cotreatment with genistein also increased the maximal concentration (C(max)), 6 h exposure (AUC(0-->360 min)), and t(1/2) of EGCG in the small intestine by 2.0-, 4.7- and 1.4-fold, respectively, compared with mice treated with EGCG only. Contrary to our expectations, the combination of 0.01% EGCG in the drinking fluid and 0.2% genistein in the diet enhanced intestinal tumorigenesis in male adenomatous polyposis coli (APC)(min/+) mice. This combination increased the multiplicity of tumors in the medial and distal small intestine: the largest increase was in tumors >2 mm in diameter (4.3-fold compared with controls). This study demonstrates that although genistein can enhance EGCG bioavailability and in vitro growth inhibitory activity, this combination enhances tumorigenesis in the APC(min/+) mouse. These results further show the need for careful cancer prevention studies in animal models and for caution when interpreting data from in vitro studies.
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Affiliation(s)
- Joshua D Lambert
- Department of Chemical Biology, Ernest Mario School of Pharmacy, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA.
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Affiliation(s)
- Crissy Dudgeon
- University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
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