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Wang Z, Chen Y, Li X, Zhang Y, Zhao X, Zhou H, Lu X, Zhao L, Yuan Q, Shi Y, Zhao J, Dong Z, Jiang Y, Liu K. Tegaserod Maleate Suppresses the Growth of Gastric Cancer In Vivo and In Vitro by Targeting MEK1/2. Cancers (Basel) 2022; 14:cancers14153592. [PMID: 35892850 PMCID: PMC9332868 DOI: 10.3390/cancers14153592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 07/14/2022] [Accepted: 07/16/2022] [Indexed: 11/16/2022] Open
Abstract
Gastric cancer (GC) ranks fifth in global incidence and fourth in mortality. The current treatments for GC include surgery, chemotherapy and radiotherapy. Although treatment strategies for GC have been improved over the last decade, the overall five-year survival rate remains less than 30%. Therefore, there is an urgent need to find novel therapeutic or preventive strategies to increase GC patient survival rates. In the current study, we found that tegaserod maleate, an FDA-approved drug, inhibited the proliferation of gastric cancer cells, bound to MEK1/2 and suppressed MEK1/2 kinase activity. Moreover, tegaserod maleate inhibited the progress of gastric cancer by depending on MEK1/2. Notably, we found that tegaserod maleate suppressed tumor growth in the patient-derived gastric xenograft (PDX) model. We further compared the effect between tegaserod maleate and trametinib, which is a clinical MEK1/2 inhibitor, and confirmed that tegaserod maleate has the same effect as trametinib in inhibiting the growth of GC. Our findings suggest that tegaserod maleate inhibited GC proliferation by targeting MEK1/2.
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Affiliation(s)
- Zitong Wang
- Pathophysiology Department, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (Y.C.); (X.L.); (Y.Z.); (X.Z.); (H.Z.); (X.L.); (L.Z.); (Q.Y.); (Y.S.); (J.Z.); (Z.D.)
| | - Yingying Chen
- Pathophysiology Department, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (Y.C.); (X.L.); (Y.Z.); (X.Z.); (H.Z.); (X.L.); (L.Z.); (Q.Y.); (Y.S.); (J.Z.); (Z.D.)
| | - Xiaoyu Li
- Pathophysiology Department, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (Y.C.); (X.L.); (Y.Z.); (X.Z.); (H.Z.); (X.L.); (L.Z.); (Q.Y.); (Y.S.); (J.Z.); (Z.D.)
| | - Yuhan Zhang
- Pathophysiology Department, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (Y.C.); (X.L.); (Y.Z.); (X.Z.); (H.Z.); (X.L.); (L.Z.); (Q.Y.); (Y.S.); (J.Z.); (Z.D.)
- China-US (Henan) Hormel Cancer Institute, Zhengzhou 450001, China
| | - Xiaokun Zhao
- Pathophysiology Department, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (Y.C.); (X.L.); (Y.Z.); (X.Z.); (H.Z.); (X.L.); (L.Z.); (Q.Y.); (Y.S.); (J.Z.); (Z.D.)
- China-US (Henan) Hormel Cancer Institute, Zhengzhou 450001, China
| | - Hao Zhou
- Pathophysiology Department, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (Y.C.); (X.L.); (Y.Z.); (X.Z.); (H.Z.); (X.L.); (L.Z.); (Q.Y.); (Y.S.); (J.Z.); (Z.D.)
| | - Xuebo Lu
- Pathophysiology Department, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (Y.C.); (X.L.); (Y.Z.); (X.Z.); (H.Z.); (X.L.); (L.Z.); (Q.Y.); (Y.S.); (J.Z.); (Z.D.)
- China-US (Henan) Hormel Cancer Institute, Zhengzhou 450001, China
| | - Lili Zhao
- Pathophysiology Department, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (Y.C.); (X.L.); (Y.Z.); (X.Z.); (H.Z.); (X.L.); (L.Z.); (Q.Y.); (Y.S.); (J.Z.); (Z.D.)
| | - Qiang Yuan
- Pathophysiology Department, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (Y.C.); (X.L.); (Y.Z.); (X.Z.); (H.Z.); (X.L.); (L.Z.); (Q.Y.); (Y.S.); (J.Z.); (Z.D.)
- China-US (Henan) Hormel Cancer Institute, Zhengzhou 450001, China
| | - Yunshu Shi
- Pathophysiology Department, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (Y.C.); (X.L.); (Y.Z.); (X.Z.); (H.Z.); (X.L.); (L.Z.); (Q.Y.); (Y.S.); (J.Z.); (Z.D.)
- China-US (Henan) Hormel Cancer Institute, Zhengzhou 450001, China
| | - Jimin Zhao
- Pathophysiology Department, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (Y.C.); (X.L.); (Y.Z.); (X.Z.); (H.Z.); (X.L.); (L.Z.); (Q.Y.); (Y.S.); (J.Z.); (Z.D.)
- State Key Laboratory of Esophageal Cancer Prevention and Treatment, Zhengzhou 450001, China
- Basic Medicine Research Center, Zhengzhou University, Zhengzhou 450001, China
| | - Ziming Dong
- Pathophysiology Department, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (Y.C.); (X.L.); (Y.Z.); (X.Z.); (H.Z.); (X.L.); (L.Z.); (Q.Y.); (Y.S.); (J.Z.); (Z.D.)
- State Key Laboratory of Esophageal Cancer Prevention and Treatment, Zhengzhou 450001, China
- Basic Medicine Research Center, Zhengzhou University, Zhengzhou 450001, China
| | - Yanan Jiang
- Pathophysiology Department, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (Y.C.); (X.L.); (Y.Z.); (X.Z.); (H.Z.); (X.L.); (L.Z.); (Q.Y.); (Y.S.); (J.Z.); (Z.D.)
- China-US (Henan) Hormel Cancer Institute, Zhengzhou 450001, China
- State Key Laboratory of Esophageal Cancer Prevention and Treatment, Zhengzhou 450001, China
- Basic Medicine Research Center, Zhengzhou University, Zhengzhou 450001, China
- Correspondence: (Y.J.); (K.L.)
| | - Kangdong Liu
- Pathophysiology Department, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (Y.C.); (X.L.); (Y.Z.); (X.Z.); (H.Z.); (X.L.); (L.Z.); (Q.Y.); (Y.S.); (J.Z.); (Z.D.)
- China-US (Henan) Hormel Cancer Institute, Zhengzhou 450001, China
- State Key Laboratory of Esophageal Cancer Prevention and Treatment, Zhengzhou 450001, China
- Basic Medicine Research Center, Zhengzhou University, Zhengzhou 450001, China
- Provincial Cooperative Innovation Center for Cancer Chemoprevention, Zhengzhou 450001, China
- Cancer Chemoprevention International Collaboration Laboratory, Zhengzhou 450001, China
- Correspondence: (Y.J.); (K.L.)
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Targeting nutrient metabolism with FDA-approved drugs for cancer chemoprevention: Drugs and mechanisms. Cancer Lett 2021; 510:1-12. [PMID: 33857528 DOI: 10.1016/j.canlet.2021.03.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 03/21/2021] [Accepted: 03/30/2021] [Indexed: 12/14/2022]
Abstract
Proliferating cancer cells exhibit metabolic alterations and specific nutritional needs for adapting to their rapid growth. These changes include using aerobic glycolysis, lipid metabolic disorder, and irregular protein degradation. It may be useful to target metabolic abnormalities for cancer chemoprevention. Epidemiological and mechanism-related studies have indicated that many FDA-approved anti-metabolic drugs decrease tumor risk, inhibit tumor growth, or enhance the effect of chemotherapeutic drugs. Drugs targeting nutrient metabolism have fewer side effects with long-term use compared to chemotherapeutic drugs. The characteristics of these drugs make them promising candidates for cancer chemoprevention. Here, we summarize recent discoveries of the chemo-preventive effects of drugs targeting nutrient metabolic pathways and discuss future applications and challenges. Understanding the effects and mechanisms of anti-metabolic drugs in cancer has important implications for exploring strategies for cancer chemoprevention.
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Abstract
Flavonoids are not essential nutrients in that their absence from the diet does not produce deficiency conditions in animals and man. However, many have important similarities to pharmacological agents used in the treatment of disease. Their role as dietary components in disease prevention is less clear. Many potentially anti-carcinogenic and anti-atherogenic effects observed in cell cultures will not be of nutritional relevance unless flavonoids gain access to appropriate cellular sites. The bioavailability of flavonoids will depend on numerous factors including molecular structure, the amount consumed, the food matrix, degree of bioconversion in the gut and tissues, the nutrient status of the host and genetic factors. Moreover, extensive and rapid intestinal and hepatic metabolism of flavonoids suggests that the body may treat them as xenobiotic and potentially toxic compounds requiring rapid elimination. Consequently, in addition to potential health benefits, possible adverse effects of flavonoids in the diet also need to be considered when assessing their roles in the prevention of degenerative diseases.
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Affiliation(s)
- Janet Kyle
- Molecular Nutrition Group, Rowett Research Institute, Aberdeen, AB21 9SB, Scotland, UK
| | - Garry Duthie
- Molecular Nutrition Group, Rowett Research Institute, Aberdeen, AB21 9SB, Scotland, UK
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Vishchuk OS, Sun H, Wang Z, Ermakova SP, Xiao J, Lu T, Xue P, Zvyagintseva TN, Xiong H, Shao C, Yan W, Duan Q, Zhu F. PDZ-binding kinase/T-LAK cell-originated protein kinase is a target of the fucoidan from brown alga Fucus evanescens in the prevention of EGF-induced neoplastic cell transformation and colon cancer growth. Oncotarget 2017; 7:18763-73. [PMID: 26936995 PMCID: PMC4951327 DOI: 10.18632/oncotarget.7708] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2015] [Accepted: 01/29/2016] [Indexed: 01/15/2023] Open
Abstract
The fucoidan with high anticancer activity was isolated from brown alga Fucus evanescens. The compound effectively prevented EGF-induced neoplastic cell transformation through inhibition of TOPK/ERK1/2/MSK 1 signaling axis. In vitro studies showed that the fucoidan attenuated mitogen-activated protein kinases downstream signaling in a colon cancer cells with different expression level of TOPK, resulting in growth inhibition. The fucoidan exerts its effects by directly interacting with TOPK kinase in vitro and ex vivo and inhibits its kinase activity. In xenograft animal model, oral administration of the fucoidan suppressed HCT 116 colon tumor growth. The phosphorylation of TOPK downstream signaling molecules in tumor tissues was also inhibited by the fucoidan. Taken together, our findings support the cancer preventive efficacy of the fucoidan through its targeting of TOPK for the prevention of neoplastic cell transformation and progression of colon carcinomas in vitro and ex vivo.
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Affiliation(s)
- Olesia S Vishchuk
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, Wuhan, Hubei 430030, PR China.,G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of Russian Academy of Sciences, Laboratory of Enzyme Chemistry, 690022 Vladivostok, Russian Federation
| | - Huimin Sun
- Department of Urology, Xijing Hospital, The Fourth Military Medical University, Xi'an, Shaanxi 710032, PR China
| | - Zhe Wang
- Department of Pathology, Xijing Hospital, The Fourth Military Medical University, Xi'an, Shaanxi 710032, PR China
| | - Svetlana P Ermakova
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of Russian Academy of Sciences, Laboratory of Enzyme Chemistry, 690022 Vladivostok, Russian Federation
| | - JuanJuan Xiao
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, Wuhan, Hubei 430030, PR China
| | - Tao Lu
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, Wuhan, Hubei 430030, PR China
| | - PeiPei Xue
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, Wuhan, Hubei 430030, PR China
| | - Tatyana N Zvyagintseva
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of Russian Academy of Sciences, Laboratory of Enzyme Chemistry, 690022 Vladivostok, Russian Federation
| | - Hua Xiong
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, Wuhan, Hubei 430030, PR China
| | - Chen Shao
- Department of Urology, Xijing Hospital, The Fourth Military Medical University, Xi'an, Shaanxi 710032, PR China.,State Key Laboratory of Cancer Biology & Xijing Hospital of Digestive Diseases, The Fourth Military Medical University, Xi'an, Shaanxi 710032, PR China
| | - Wei Yan
- Department of Pathology, Xijing Hospital, The Fourth Military Medical University, Xi'an, Shaanxi 710032, PR China
| | - Qiuhong Duan
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, Wuhan, Hubei 430030, PR China
| | - Feng Zhu
- Department of Biochemistry and Molecular Biology, School of Basic Medicine, Huazhong University of Science and Technology, Wuhan, Hubei 430030, PR China
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Abstract
SIGNIFICANCE Diet exerts a major influence on the risk for developing cancer and heart disease. Food factors such as flavonoids are alleged to protect cells from premature aging and disease by shielding DNA, proteins, and lipids from oxidative damage. RECENT ADVANCES Our work has focused on clarifying the effects of dietary components on cancer cell proliferation and tumor growth, discovering mechanisms to explain the effects, and identifying the specific molecular targets of these compounds. Our strategy for identifying specific molecular targets of phytochemicals involves the use of supercomputer technology combined with protein crystallography, molecular biology, and experimental laboratory verification. CRITICAL ISSUES One of the greatest challenges for scientists is to reduce the accumulation of distortion and half truths reported in the popular media regarding the health benefits of certain foods or food supplements. The use of these is not new, but interest has increased dramatically because of perceived health benefits that are presumably acquired without unpleasant side effects. Flavonoids are touted to exert many beneficial effects in vitro. However, whether they can produce these effects in vivo is disputed. FUTURE DIRECTIONS The World Health Organization indicates that one third of all cancer deaths are preventable and that diet is closely linked to prevention. Based on this idea and epidemiological findings, attention has centered on dietary phytochemicals as an effective intervention in cancer development. However, an unequivocal link between diet and cancer has not been established. Thus, identifying cancer preventive dietary agents with specific molecular targets is essential to move forward toward successful cancer prevention.
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Affiliation(s)
- Ann M Bode
- The Hormel Institute, University of Minnesota, Austin, MN 55912, USA
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Leonarduzzi G, Sottero B, Poli G. Targeting tissue oxidative damage by means of cell signaling modulators: The antioxidant concept revisited. Pharmacol Ther 2010; 128:336-74. [DOI: 10.1016/j.pharmthera.2010.08.003] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Accepted: 08/02/2010] [Indexed: 12/25/2022]
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Peng W, Yao YF. Deuterium labelling of theaflavin. J Labelled Comp Radiopharm 2009. [DOI: 10.1002/jlcr.1605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Rogozin EA, Lee KW, Kang NJ, Yu H, Nomura M, Miyamoto KI, Conney AH, Bode AM, Dong Z. Inhibitory effects of caffeine analogues on neoplastic transformation: structure-activity relationship. Carcinogenesis 2008; 29:1228-34. [PMID: 18195054 DOI: 10.1093/carcin/bgn016] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Some xanthine analogues, including 1,3,7-trimethylxanthine (caffeine) and 1,3-dimethylxanthine (theophylline), have been shown to exert anticancer activities in both cell culture and animal models. The present study focused on the relationship of structure and activity of 50 different caffeine analogues in preventing epidermal growth factor (EGF)-induced malignant transformation of mouse epidermal JB6 promotion-sensitive (P+) Cl41 (JB6 P+) cells. Results indicated that the inhibition of cell transformation by the 1,3,7-trialkylxanthines depends on the number of carbons at the alkyl groups R1 and R3, but not R7. Notably, 1-ethyl-3-hexylxanthine (xanthine 70) was the most effective compound for inhibiting EGF-induced neoplastic transformation among the 50 xanthine analogues tested. The 50% inhibition of cell transformation (ICT(50)) value for xanthine 70 was 48- or 75-fold less than the ICT(50) value of caffeine or theophylline, respectively. Further study revealed that xanthine 70 (5-40 muM) dose dependently inhibited EGF-induced transactivation of activator protein 1 (AP-1), whereas theophylline or caffeine (up to 500 muM) had no effect on AP-1 activity. In addition, xanthine 70 (10 muM) inhibited 12-O-tetradecanoylphorbol-13-acetate- or H-Ras-induced neoplastic transformation in JB6 P+ cells by 78.2 or 62.0%, respectively. Collectively, these results indicated that the number of carbons at R1 and R3 is important for the antitumor-promoting activity of the trialkylxanthines and xanthine 70 might be a promising anticancer agent.
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Affiliation(s)
- Evgeny A Rogozin
- Hormel Institute, University of Minnesota, Austin, MN 55912, USA
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Ichimatsu D, Nomura M, Nakamura S, Moritani S, Yokogawa K, Kobayashi S, Nishioka T, Miyamoto KI. Structure-activity relationship of flavonoids for inhibition of epidermal growth factor-induced transformation of JB6 Cl 41 cells. Mol Carcinog 2007; 46:436-45. [PMID: 17219438 DOI: 10.1002/mc.20292] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
We found that quercetin, myricetin, quercetagetin, fisetin, (-)-epigallocatechin gallate (EGCG), and theaflavins, among 24 flavonoids examined, markedly inhibited epidermal growth factor (EGF)-induced cell transformation of mouse epidermal JB6 Cl 41 cells. The six flavonoids suppressed the EGF-induced activation of activator protein 1 (AP-1). In addition, myricetin, quercetagetin, EGCG, and theaflavins directly inhibited EGF-induced phosphatidylinositol 3-kinase (PI3K) activation. The important structural features of flavonoids for cell transformation-inhibitory activity are 3'- and 4'-OH on the B-ring, 3-OH on the C-ring, C2=C3 double bond in the C-ring, and the phenylchromone (C6-C5-C6) skeleton in the flavonols, and the galloyl group in EGCG and theaflavins. Our results provide new insight into possible mechanisms of the anti-carcinogenic effects of flavonoids, and could help to provide a basis for the design of novel cancer chemopreventive agents.
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Affiliation(s)
- Daisuke Ichimatsu
- Department of Hospital Pharmacy, School of Medicine, Kanazawa University, Kanazawa, Japan
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Abstract
Carcinogenesis is a multistage process consisting of initiation, promotion, and progression stages and each stage may be a possible target for chemopreventive agents. A significant outcome of these investigations on the elucidation of molecular and cellular mechanisms is the explication of signal transduction pathways induced by tumor promoters in cancer development. The current belief today is that cancer may be prevented or treated by targeting specific cancer genes, signaling proteins, and transcription factors. The molecular mechanisms explaining how normal cells undergo neoplastic transformation induced by tumor promoters are rapidly being clarified. Accumulating research evidence suggests that many of dietary factors, including tea compounds, may be used alone or in combination with traditional chemotherapeutic agents to prevent or treat cancer. The potential advantage of many natural or dietary compounds seems to focus on their potent anticancer activity combined with low toxicity and very few adverse side effects. This review summarizes some of our recent work regarding the effects of the various tea components on signal transduction pathways involved in neoplastic cell transformation and carcinogenesis.
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Affiliation(s)
- Ann M Bode
- The Hormel Institute, University of Minnesota, Austin, Minnesota 55912, USA
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Aruoma OI, Sun B, Fujii H, Neergheen VS, Bahorun T, Kang KS, Sung MK. Low molecular proanthocyanidin dietary biofactor Oligonol: Its modulation of oxidative stress, bioefficacy, neuroprotection, food application and chemoprevention potentials. Biofactors 2006; 27:245-65. [PMID: 17012779 DOI: 10.1002/biof.5520270121] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Interdisciplinary research endeavors are directed at understanding the molecular mechanisms of neurodegenerative and chronic diseases that affect human lifestyle. Hence the potential for developing medicinal herb-derived and food plant-derived prophylactic agents directed at neurological, metabolic, cardiovascular and psychiatric disorders abounds. Oligonol is a novel technology product emanating from the oligomerization of polyphenols, typically proanthocyanidin from a variety of fruits (grapes, apples, persimmons etc.) that has optimized bioavailability. It is an optimized phenolic product containing catechin-type monomers and oligomeric proanthocyanidins, the easily absorbed forms. Typically the constituents of Oligonol are 15-20% monomers, 8-12% dimers and 5-10% trimers. Supplementation of mice with Oligonol prior to the administration of ferric-nitrilotriacetic complex (a Fenton chemistry model) significantly reduced the extent of lipid peroxidation in the kidney, brain and liver. Oligonol triggers apoptosis in the MCF-7 and MDA-MB-231 breast cancer cells through modulation of the pro-apoptotic Bcl-2 family of proteins and the MEK/ERK signaling pathway, an observation suggesting its important chemopreventive effects. The senescence-accelerated strain of mice (SAM) are models of senescence acceleration and geriatric disorders which exhibit learning and memory deficits and enhanced production or defective control of oxidative stress leading.
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Affiliation(s)
- Okezie I Aruoma
- Faculty of Health and Social Care, London South Bank University, 103 Borough Road, London SE1 0AA, UK.
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Nomura M, Ichimatsu D, Moritani S, Koyama I, Dong Z, Yokogawa K, Miyamoto KI. Inhibition of epidermal growth factor-induced cell transformation and Akt activation by caffeine. Mol Carcinog 2005; 44:67-76. [PMID: 16044420 DOI: 10.1002/mc.20120] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We found that caffeine significantly inhibited epidermal growth factor (EGF)- and 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced cell transformation in the JB6 mouse epidermal cell line. The tumor promoter-induced cell transformation was also blocked by treatment with an adenosine A1 receptor antagonist, 8-phenyltheophylline (8-PTH). Caffeine slightly attenuated activation of EGF-induced activator protein 1 (AP-1) activation, which play important roles in cell transformation, but only at the highest concentration examined (1 mM). Interestingly, pretreatment with caffeine suppressed EGF-induced phosphorylation and activation of Akt and ribosomal p 70 S6 protein kinase (p 70 S 6 K), a target of Akt, without inhibiting phosphatidylinositol 3-kinase (PI 3 K) activation. The inhibition of Akt activation of caffeine was not a result of its adenosine receptor antagonism. Because Akt plays a key role in signal transduction pathways leading to cell proliferation and apoptosis, our results provide novel insight into possible mechanisms of the chemotherapeutic effect of caffeine.
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Affiliation(s)
- Masaaki Nomura
- Department of Hospital Pharmacy, School of Medicine, Kanazawa University, Kanazawa, Japan
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Peng G, Wargovich MJ, Dixon DA. Anti-proliferative effects of green tea polyphenol EGCG on Ha-Ras-induced transformation of intestinal epithelial cells. Cancer Lett 2005; 238:260-70. [PMID: 16157446 DOI: 10.1016/j.canlet.2005.07.018] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2005] [Revised: 07/08/2005] [Accepted: 07/12/2005] [Indexed: 12/12/2022]
Abstract
Oncogenic Ras mutations are frequently observed in colorectal cancer and participate in neoplastic transformation of intestinal epithelial cells. Accumulating evidence demonstrates the chemopreventive properties of green tea on colon carcinogenesis. Here we investigated the major green tea polyphenol, (-)-epigallocatechin-3-gallate (EGCG), to inhibit proliferation of intestinal epithelial cells (RIE-1) transfected with an inducible Ha-Ras(Val12) cDNA. EGCG inhibited cell proliferation induced by oncogenic Ras and blocked cell cycle transition at G1 phase via inhibition of cyclin D1 expression. The EGCG IC(50) was 42microM in transformed cells and 81microM in non-transformed cells. EGCG also promoted E-cadherin expression, which is downregulated by Ras transformation. This study demonstrates the potential of the natural compound EGCG as an effective adjuvant therapy for colon tumors bearing Ras mutations.
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Affiliation(s)
- Guang Peng
- Department of Pathology and Microbiology, University of South Carolina School of Medicine, Columbia, SC, USA
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Bode AM, Dong Z. Signal transduction pathways in cancer development and as targets for cancer prevention. PROGRESS IN NUCLEIC ACID RESEARCH AND MOLECULAR BIOLOGY 2005; 79:237-97. [PMID: 16096030 DOI: 10.1016/s0079-6603(04)79005-4] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Ann M Bode
- The Hormel Institute, University of Minnesota, Austin, Minnesota 55912, USA
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