1
|
Roh E, Kim JE, Zhang T, Shin SH, Kim BG, Li J, Ma X, Lee KW, Dong Z. Orobol, 3'-hydroxy-genistein, suppresses the development and regrowth of cutaneous SCC. Biochem Pharmacol 2023; 209:115415. [PMID: 36657604 DOI: 10.1016/j.bcp.2023.115415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 01/10/2023] [Accepted: 01/11/2023] [Indexed: 01/18/2023]
Abstract
Chronic solar ultraviolet exposure is a major risk factor for cutaneous squamous cell carcinoma (cSCC), which is the second most common type of skin cancer. Our previous data showed that total protein and phosphorylation levels of T-LAK cell-originated protein kinase (TOPK) were enhanced in solar-simulated light (SSL)-induced skin carcinogenesis and overexpressed in actinic keratosis (AK) and cSCC human skin tissues compared to those in matched normal skin. Thus, targeting TOPK activity could be a helpful approach for treating cSCC. Our data showed that orobol directly binds to TOPK in an ATP-independent manner and inhibits TOPK kinase activity. Furthermore, orobol inhibited anchorage-independent colony formation by SCC12 cells in a dose-dependent manner. After discontinuing the treatment, patients commonly return to tumor-bearing conditions; therefore, therapy or intermittent dosing of drugs must be continued indefinitely. Thus, to examine the efficacy of orobol against the development and regrowth of cSCC, we established mouse models including prevention, and therapeutic models on the chronic SSL-irradiated SKH-1 hairless mice. Early treatment with orobol attenuates chronic SSL-induced cSCC development. Furthermore, orobol showed therapeutic efficacy after the formation of chronic SSL irradiation-induced tumor. In the mouse model with intermittent dosing of orobol, our data showed that re-application of orobol is effective for reducing tumor regrowth after discontinuation of treatment. Moreover, oncogenic protein levels were significantly attenuated by orobol treatment in the SSL-stimulated human skin. Thus, we suggest that orobol, as a promising TOPK inhibitor, could have an effective clinical approach to prevent and treat the development and regrowth of cSCC.
Collapse
Affiliation(s)
- Eunmiri Roh
- Department of Cosmetic Science, Kwangju Women's University, Gwangju 62396, Republic of Korea
| | - Jong-Eun Kim
- Department of Food Science & Technology, Korea National University of Transportation, Jeungpyeong, Chungbuk 27909, Republic of Korea
| | - Tianshun Zhang
- The Hormel Institute, University of Minnesota, Austin, MN 55912, USA
| | - Seung Ho Shin
- Department of Food and Nutrition, Gyeongsang National University, Jinju, Gyeongnam 52828, Republic of Korea; Institute of Agriculture and Life Science, Gyeongsang National University, Jinju, Gyeongnam 52828, Republic of Korea
| | - Byung-Gee Kim
- School of Chemical and Biological Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Jian Li
- China-US (Henan) Hormel Cancer Institute, Zhengzhou, Henan 450003, China
| | - Xinli Ma
- China-US (Henan) Hormel Cancer Institute, Zhengzhou, Henan 450003, China
| | - Ki Won Lee
- Biomodulation Major and Research Institute of Agriculture and Life Sciences, Department of Agricultural Biotechnology, Seoul National University, Seoul 08826, Republic of Korea.
| | - Zigang Dong
- College of Medicine, Zhengzhou University, Zhengzhou, Henan 450001, China.
| |
Collapse
|
2
|
Hass V, Li Y, Nisar S, Peng Z, Wang Y. Salivary esterases dramatically reduce biostability of dentin collagen treated with galloylated polyphenols. Dent Mater 2022; 38:2041-2051. [PMID: 36428113 PMCID: PMC9814242 DOI: 10.1016/j.dental.2022.11.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 11/01/2022] [Accepted: 11/11/2022] [Indexed: 11/24/2022]
Abstract
OBJECTIVE To investigate the effects of salivary esterases on biostability of collagen treated by galloylated polyphenols. METHODS Human dentin was microtomed into 6-μm-thick films, which were demineralized and treated for 60 s using solutions containing 0.6% and 2% of one of the crosslinkers: tannic acid (TAC), epigallocatechin gallate (EGCG), epigallocatechin (EGC), and N-[3-dimethylaminopropyl]-N'-ethylcarbodiimide hydrochloride (EDC)/N-hydroxysuccinimide (NHS), and for 1 h using EDC/NHS. Half of the treated and untreated (control) films were subjected to human saliva incubation. Collagen biostability was assessed via exogenous protease biodegradation by weight loss and hydroxyproline release, and endogenous MMPs by in situ zymography. The degradation products of galloylated polyphenols (TAC and EGCG) by saliva were monitored using proton nuclear magnetic resonance (1H NMR) and gel permeation chromatography (GPC). The esterase activity of saliva induced by the crosslinkers was also assessed. RESULTS Collagen films treated with TAC and EGCG exhibited significantly improved biostability (p < 0.05); however, the enhanced biostability was severely reduced after saliva incubation (p < 0.001). For EDC/NHS treated collagen, saliva incubation showed negligible effect on the biostability. 1H NMR studies confirmed the esterase-catalyzed hydrolysis of the galloyl. GPC measurements showed decreased molecular weight of TAC in saliva indicating its chemical degradation. Both TAC and EGCG showed much higher esterase activity than other treatment groups. SIGNIFICANCE The galloyl group plays important role in collagen crosslinking, inducing higher biostability. However, galloylated polyphenols crosslinked on collagen are highly susceptible to metabolism of human saliva by salivary esterase, dramatically compromising the enhanced biostability.
Collapse
Affiliation(s)
- Viviane Hass
- School of Dentistry, University of Missouri, Kansas City, Kansas City, MO 64108, USA
| | - Yong Li
- Division of Energy Matter and Systems, School of Science and Engineering, University of Missouri, Kansas City, MO 64110, USA
| | - Saleha Nisar
- School of Dentistry, University of Missouri, Kansas City, Kansas City, MO 64108, USA
| | - Zhonghua Peng
- Division of Energy Matter and Systems, School of Science and Engineering, University of Missouri, Kansas City, MO 64110, USA.
| | - Yong Wang
- School of Dentistry, University of Missouri, Kansas City, Kansas City, MO 64108, USA.
| |
Collapse
|
3
|
Hasbum A, Quintanilla J, Jr JA, Ding MH, Levy A, Chew SA. Strategies to better treat glioblastoma: antiangiogenic agents and endothelial cell targeting agents. Future Med Chem 2021; 13:393-418. [PMID: 33399488 PMCID: PMC7888526 DOI: 10.4155/fmc-2020-0289] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 11/26/2020] [Indexed: 12/12/2022] Open
Abstract
Glioblastoma multiforme (GBM) is the most prevalent and aggressive form of glioma, with poor prognosis and high mortality rates. As GBM is a highly vascularized cancer, antiangiogenic therapies to halt or minimize the rate of tumor growth are critical to improving treatment. In this review, antiangiogenic therapies, including small-molecule drugs, nucleic acids and proteins and peptides, are discussed. The authors further explore biomaterials that have been utilized to increase the bioavailability and bioactivity of antiangiogenic factors for better antitumor responses in GBM. Finally, the authors summarize the current status of biomaterial-based targeting moieties that target endothelial cells in GBM to more efficiently deliver therapeutics to these cells and avoid off-target cell or organ side effects.
Collapse
Affiliation(s)
- Asbiel Hasbum
- School of Medicine, University of Texas Rio Grande Valley, Edinburg, TX 78541, USA
| | - Jaqueline Quintanilla
- Department of Health & Biomedical Sciences, University of Texas Rio Grande Valley, Brownsville, TX 78526, USA
| | - Juan A Amieva Jr
- Department of Health & Biomedical Sciences, University of Texas Rio Grande Valley, Brownsville, TX 78526, USA
| | - May-Hui Ding
- Department of Health & Biomedical Sciences, University of Texas Rio Grande Valley, Brownsville, TX 78526, USA
| | - Arkene Levy
- Dr Kiran C Patel College of Allopathic Medicine, Nova Southeastern University, FL 33314, USA
| | - Sue Anne Chew
- Department of Health & Biomedical Sciences, University of Texas Rio Grande Valley, Brownsville, TX 78526, USA
| |
Collapse
|
4
|
Wang W, Zhang S, Lv L, Sang S. A new method to prepare and redefine black tea thearubigins. J Chromatogr A 2018; 1563:82-88. [PMID: 29859681 PMCID: PMC6008242 DOI: 10.1016/j.chroma.2018.05.060] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2017] [Revised: 04/05/2018] [Accepted: 05/27/2018] [Indexed: 12/21/2022]
Abstract
Thearubigins (TRs) are the major components of black tea, which are formed during the fermentation reactions. Although anti-inflammatory and anti-cancer activities of TRs have been reported, the prepared TRs according to the literature methods still contain many floating peaks. It is puzzling whether the observed activities are from TRs or these floating peaks. Thus, it is urgent to develop a method to prepare pure TRs and redefine them. In the present study, we developed a new method, the combination of caffeine precipitation and Sephadex LH-20 column chromatography, to prepare pure TRs. The floating peaks on the hump of the crude TRs were removed, and pure TRs were prepared. The chemical profile of the floating peaks was established using LC/MS, and the major compounds in this fraction were identified as apigenin glycosides, quercetin glycosides, kaempferol glycosides, theaflavins, theasinensin, and galloylglucoses based on the analysis of their tandem mass spectra and in comparison with literature data. This study will pave the way to further study the chemistry and biological activities of TRs and the health effects of black tea consumption.
Collapse
Affiliation(s)
- Weixin Wang
- Laboratory for Functional Foods and Human Health, Center for Excellence in Post-Harvest Technologies, North Carolina Agricultural and Technical State University, North Carolina Research Campus, 500 Laureate Way, Kannapolis, NC 28081, United States
| | - Shuwei Zhang
- Laboratory for Functional Foods and Human Health, Center for Excellence in Post-Harvest Technologies, North Carolina Agricultural and Technical State University, North Carolina Research Campus, 500 Laureate Way, Kannapolis, NC 28081, United States
| | - Lishuang Lv
- Department of Food Science and Technology, Nanjing Normal University, 122# Ninghai Road, Nanjing, 210097, PR China
| | - Shengmin Sang
- Laboratory for Functional Foods and Human Health, Center for Excellence in Post-Harvest Technologies, North Carolina Agricultural and Technical State University, North Carolina Research Campus, 500 Laureate Way, Kannapolis, NC 28081, United States.
| |
Collapse
|
5
|
Targeting PRPK and TOPK for skin cancer prevention and therapy. Oncogene 2018; 37:5633-5647. [PMID: 29904102 PMCID: PMC6195829 DOI: 10.1038/s41388-018-0350-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 05/08/2018] [Accepted: 05/11/2018] [Indexed: 02/02/2023]
Abstract
Solar ultraviolet (sUV) irradiation is a major environmental carcinogen that can cause inflammation and skin cancer. The costs and morbidity associated with skin cancer are increasing, and therefore identifying molecules that can help prevent skin carcinogenesis is important. In this study, we identified the p53-related protein kinase (PRPK) as a novel oncogenic protein that is phosphorylated by the T-LAK cell-originated protein kinase (TOPK). Knockdown of TOPK inhibited PRPK phosphorylation and conferred resistance to solar-simulated light (SSL)-induced skin carcinogenesis in mouse models. In the clinic, acute SSL irradiation significantly increased epidermal thickness as well as total protein and phosphorylation levels of TOPK and PRPK in human skin tissues. We identified two PRPK inhibitors, FDA-approved rocuronium bromide (Zemuron®) or betamethasone 17-valerate (Betaderm®) that could attenuate TOPK-dependent PRPK signaling. Importantly, topical application of either rocuronium bromide or betamethasone decreased SSL-induced epidermal hyperplasia, neovascularization, and cutaneous squamous cell carcinoma (cSCC) development in SKH1 (Crl: SKH1-Hrhr) hairless mice by inhibiting PRPK activation, and also reduced expression of the proliferation and oncogenesis markers, COX-2, cyclin D1, and MMP-9. This study is the first to demonstrate that targeting PRPK could be useful against sUV-induced cSCC development.
Collapse
|
6
|
Sultani HN, Ghazal RA, Hayallah AM, Abdulrahman LK, Abu-Hammour K, AbuHammad S, Taha MO, Zihlif MA. Inhibitory Effects of New Mercapto Xanthine Derivatives in Human mcf7 and k562 Cancer Cell Lines. J Heterocycl Chem 2017. [DOI: 10.1002/jhet.2602] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
| | | | - Alaa M. Hayallah
- Department of Pharmaceutical Organic Chemistry, Faculty of Pharmacy; Assiut University; Assiut 71526 Egypt
| | | | | | - Shatha AbuHammad
- Department of Biochemistry, Faculty of Medicine; The University of Jordan; Amman 11942 Jordan
| | - Mutasem O. Taha
- Drug Discovery Unit, Faculty of Pharmacy; The University of Jordan; Amman 11942 Jordan
| | - Malek A. Zihlif
- Department of Biochemistry, Faculty of Medicine; The University of Jordan; Amman 11942 Jordan
| |
Collapse
|
7
|
Li F, Tao Y, Qiao Y, Li K, Jiang Y, Cao C, Ren S, Chang X, Wang X, Wang Y, Xie Y, Dong Z, Zhao J, Liu K. Eupatilin inhibits EGF-induced JB6 cell transformation by targeting PI3K. Int J Oncol 2016; 49:1148-54. [DOI: 10.3892/ijo.2016.3600] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Accepted: 06/17/2016] [Indexed: 11/05/2022] Open
|
8
|
Synergistic anticancer activity of biologicals from green and black tea on DU 145 human prostate cancer cells. Cent Eur J Immunol 2015; 40:1-4. [PMID: 26155176 PMCID: PMC4472533 DOI: 10.5114/ceji.2015.50825] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Accepted: 01/19/2015] [Indexed: 12/16/2022] Open
Abstract
There is considerable interest in the potential of botanicals in preventing and/or alleviating chronic ailments. Among the most studied botanicals are compounds present in green and black teas. Nontoxic tea polyphenols are potent antioxidants, and they also modulate several signalling pathways and inhibit proteins such as MMP-9 or protein plasminogen activator system, making them very attractive potential therapeutics. One criticism of the prophylactic or therapeutic use of green or black tea polyphenols was presumably the poor bioavailability of these chemicals when ingested. However, studies have shown that epigallocatechin-3-gallate (EGCG) and theaflavin (TF) can be detected in the small and large intestine, liver, and prostate of experimental animals after consumption of tea extracts. In particular, a study was carried out on 20 men scheduled for prostatectomy, who were assigned to consume teas for five days before surgery. Tea polyphenols were detected in the prostate. This fact contradicts the common misconception of poor bioavailability of TF and EGCG and makes feasible the application of green or black tea polyphenols as prophylactic and therapeutic agents. Theaflavins and catechins seem to act on cancer cells largely through different pathways, so utilisation of both could offer synergistic anticancer effects, but so far no work has been done on the cumulative effects of EGCG and TF on prostate cancer. Therefore, in this study we have investigated if EGCG in combination with TF can reduce the rate of prostate cancer growth, and we have observed greater cell death compared to application of either TF or EGCG alone.
Collapse
|
9
|
Lee JH, Kim JE, Jang YJ, Lee CC, Lim TG, Jung SK, Lee E, Lim SS, Heo YS, Seo SG, Son JE, Kim JR, Lee CY, Lee HJ, Lee KW. Dehydroglyasperin C suppresses TPA-induced cell transformation through direct inhibition of MKK4 and PI3K. Mol Carcinog 2015; 55:552-62. [DOI: 10.1002/mc.22302] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2014] [Revised: 12/26/2014] [Accepted: 01/21/2015] [Indexed: 01/08/2023]
Affiliation(s)
- Ji Hoon Lee
- WCU Biomodulation Major, Department of Agricultural Biotechnology and Center for Food and Bioconvergence; Seoul National University; Seoul Republic of Korea
- Advanced Institutes of Convergence Technology; Seoul National University; Suwon Republic of Korea
| | - Jong-Eun Kim
- WCU Biomodulation Major, Department of Agricultural Biotechnology and Center for Food and Bioconvergence; Seoul National University; Seoul Republic of Korea
- Advanced Institutes of Convergence Technology; Seoul National University; Suwon Republic of Korea
- Research Institute of Bio Food Industry, Institute of Green Bio Science and Technology; Seoul National University; Pyeongchang Republic of Korea
| | - Young Jin Jang
- WCU Biomodulation Major, Department of Agricultural Biotechnology and Center for Food and Bioconvergence; Seoul National University; Seoul Republic of Korea
- Division of Creative Food Science for Health; Korea Food Research Institute; Seongnam Republic of Korea
| | - Charles C. Lee
- Department of Food Science and Technology; Cornell University; Ithaca NY 14456 USA
| | - Tae-Gyu Lim
- WCU Biomodulation Major, Department of Agricultural Biotechnology and Center for Food and Bioconvergence; Seoul National University; Seoul Republic of Korea
- Advanced Institutes of Convergence Technology; Seoul National University; Suwon Republic of Korea
| | - Sung Keun Jung
- WCU Biomodulation Major, Department of Agricultural Biotechnology and Center for Food and Bioconvergence; Seoul National University; Seoul Republic of Korea
- Division of Creative Food Science for Health; Korea Food Research Institute; Seongnam Republic of Korea
| | - Eunjung Lee
- WCU Biomodulation Major, Department of Agricultural Biotechnology and Center for Food and Bioconvergence; Seoul National University; Seoul Republic of Korea
- Traditional Alcoholic Beverage Research Team; Korea Food Research Institute; Seongnam Republic of Korea
| | - Soon Sung Lim
- Department of Food Science and Nutrition; Hallym University; Chuncheon Republic of Korea
| | - Yong Seok Heo
- Department of Chemistry; Konkuk University; Seoul Republic of Korea
| | - Sang Gwon Seo
- WCU Biomodulation Major, Department of Agricultural Biotechnology and Center for Food and Bioconvergence; Seoul National University; Seoul Republic of Korea
- Advanced Institutes of Convergence Technology; Seoul National University; Suwon Republic of Korea
| | - Joe Eun Son
- WCU Biomodulation Major, Department of Agricultural Biotechnology and Center for Food and Bioconvergence; Seoul National University; Seoul Republic of Korea
- Advanced Institutes of Convergence Technology; Seoul National University; Suwon Republic of Korea
| | - Jong Rhan Kim
- WCU Biomodulation Major, Department of Agricultural Biotechnology and Center for Food and Bioconvergence; Seoul National University; Seoul Republic of Korea
- Advanced Institutes of Convergence Technology; Seoul National University; Suwon Republic of Korea
| | - Chang Yong Lee
- Department of Food Science and Technology; Cornell University; Ithaca NY 14456 USA
- Department of Biochemistry; King Abdulaziz University; Jeddah SA
| | - Hyong Joo Lee
- Research Institute of Bio Food Industry, Institute of Green Bio Science and Technology; Seoul National University; Pyeongchang Republic of Korea
| | - Ki Won Lee
- WCU Biomodulation Major, Department of Agricultural Biotechnology and Center for Food and Bioconvergence; Seoul National University; Seoul Republic of Korea
- Advanced Institutes of Convergence Technology; Seoul National University; Suwon Republic of Korea
- Research Institute of Bio Food Industry, Institute of Green Bio Science and Technology; Seoul National University; Pyeongchang Republic of Korea
- Institute on Aging; Seoul National University; Seoul Republic of Korea
| |
Collapse
|
10
|
Liu H, Liu K, Huang Z, Park CM, Thimmegowda NR, Jang JH, Ryoo IJ, He L, Kim SO, Oi N, Lee KW, Soung NK, Bode AM, Yang Y, Zhou X, Erikson RL, Ahn JS, Hwang J, Kim KE, Dong Z, Kim BY. A chrysin derivative suppresses skin cancer growth by inhibiting cyclin-dependent kinases. J Biol Chem 2013; 288:25924-25937. [PMID: 23888052 DOI: 10.1074/jbc.m113.464669] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Chrysin (5,7-dihydroxyflavone), a natural flavonoid widely distributed in plants, reportedly has chemopreventive properties against various cancers. However, the anticancer activity of chrysin observed in in vivo studies has been disappointing. Here, we report that a chrysin derivative, referred to as compound 69407, more strongly inhibited EGF-induced neoplastic transformation of JB6 P(+) cells compared with chrysin. It attenuated cell cycle progression of EGF-stimulated cells at the G1 phase and inhibited the G1/S transition. It caused loss of retinoblastoma phosphorylation at both Ser-795 and Ser-807/811, the preferred sites phosphorylated by Cdk4/6 and Cdk2, respectively. It also suppressed anchorage-dependent and -independent growth of A431 human epidermoid carcinoma cells. Compound 69407 reduced tumor growth in the A431 mouse xenograft model and retinoblastoma phosphorylation at Ser-795 and Ser-807/811. Immunoprecipitation kinase assay results showed that compound 69407 attenuated endogenous Cdk4 and Cdk2 kinase activities in EGF-stimulated JB6 P(+) cells. Pulldown and in vitro kinase assay results indicated that compound 69407 directly binds with Cdk2 and Cdk4 in an ATP-independent manner and inhibited their kinase activities. A binding model between compound 69407 and a crystal structure of Cdk2 predicted that compound 69407 was located inside the Cdk2 allosteric binding site. The binding was further verified by a point mutation binding assay. Overall results indicated that compound 69407 is an ATP-noncompetitive cyclin-dependent kinase inhibitor with anti-tumor effects, which acts by binding inside the Cdk2 allosteric pocket. This study provides new insights for creating a general pharmacophore model to design and develop novel ATP-noncompetitive agents with chemopreventive or chemotherapeutic potency.
Collapse
Affiliation(s)
- Haidan Liu
- From the World Class Institute, Korea Research Institute of Bioscience and Biotechnology, Ochang, Cheongwon 363-883, Republic of Korea,; the Hormel Institute, University of Minnesota, Austin, Minnesota 55912,; the Department of Cardiothoracic Surgery and; Clinical Center for Gene Diagnosis and Therapy, The Second Xiangya Hospital, Central South University, Renmin Road 139, Changsha, Hunan 410011, China
| | - Kangdong Liu
- From the World Class Institute, Korea Research Institute of Bioscience and Biotechnology, Ochang, Cheongwon 363-883, Republic of Korea,; the Hormel Institute, University of Minnesota, Austin, Minnesota 55912,; the Basic Medical College, Zhengzhou University, ZhengZhou 450001 China, and
| | - Zunnan Huang
- the Hormel Institute, University of Minnesota, Austin, Minnesota 55912
| | - Chan-Mi Park
- From the World Class Institute, Korea Research Institute of Bioscience and Biotechnology, Ochang, Cheongwon 363-883, Republic of Korea
| | - N R Thimmegowda
- From the World Class Institute, Korea Research Institute of Bioscience and Biotechnology, Ochang, Cheongwon 363-883, Republic of Korea
| | - Jae-Hyuk Jang
- the Chemical Biology Research Center, Korea Research Institute of Bioscience and Biotechnology, Yangcheng-ri, Ochang, Cheongwon, Chungcheongbuk-do 363-883, Republic of Korea
| | - In-Ja Ryoo
- the Chemical Biology Research Center, Korea Research Institute of Bioscience and Biotechnology, Yangcheng-ri, Ochang, Cheongwon, Chungcheongbuk-do 363-883, Republic of Korea
| | - Long He
- From the World Class Institute, Korea Research Institute of Bioscience and Biotechnology, Ochang, Cheongwon 363-883, Republic of Korea
| | - Sun-Ok Kim
- From the World Class Institute, Korea Research Institute of Bioscience and Biotechnology, Ochang, Cheongwon 363-883, Republic of Korea
| | - Naomi Oi
- the Hormel Institute, University of Minnesota, Austin, Minnesota 55912
| | - Ki Won Lee
- the Department of Agricultural Biotechnology, Seoul National University, Seoul 151-921, Republic of Korea
| | - Nak-Kyun Soung
- From the World Class Institute, Korea Research Institute of Bioscience and Biotechnology, Ochang, Cheongwon 363-883, Republic of Korea
| | - Ann M Bode
- the Hormel Institute, University of Minnesota, Austin, Minnesota 55912
| | - Yifeng Yang
- the Department of Cardiothoracic Surgery and
| | - Xinmin Zhou
- the Department of Cardiothoracic Surgery and
| | - Raymond L Erikson
- the Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138
| | - Jong-Seog Ahn
- the Chemical Biology Research Center, Korea Research Institute of Bioscience and Biotechnology, Yangcheng-ri, Ochang, Cheongwon, Chungcheongbuk-do 363-883, Republic of Korea
| | - Joonsung Hwang
- From the World Class Institute, Korea Research Institute of Bioscience and Biotechnology, Ochang, Cheongwon 363-883, Republic of Korea
| | - Kyoon Eon Kim
- the Department of Biochemistry, College of Natural Science, Chung Nam National University, Yuseong, Daejeon 305-764, Republic of Korea
| | - Zigang Dong
- the Hormel Institute, University of Minnesota, Austin, Minnesota 55912,.
| | - Bo-Yeon Kim
- From the World Class Institute, Korea Research Institute of Bioscience and Biotechnology, Ochang, Cheongwon 363-883, Republic of Korea,.
| |
Collapse
|
11
|
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.
Collapse
Affiliation(s)
- Ann M Bode
- The Hormel Institute, University of Minnesota, Austin, MN 55912, USA
| | | |
Collapse
|
12
|
Tabrez S, Priyadarshini M, Urooj M, Shakil S, Ashraf GM, Khan MS, Kamal MA, Alam Q, Jabir NR, Abuzenadah AM, Chaudhary AGA, Damanhouri GA. Cancer chemoprevention by polyphenols and their potential application as nanomedicine. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART C, ENVIRONMENTAL CARCINOGENESIS & ECOTOXICOLOGY REVIEWS 2013; 31:67-98. [PMID: 23534395 DOI: 10.1080/10590501.2013.763577] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Today cancer is a leading cause of death among the developed countries. Its highly complex nature makes it difficult to understand as it entails multiple cellular physiological systems such as cell signaling and apoptosis. The biggest challenges faced by cancer chemoprevention/chemotherapy is maintaining drug circulation and avoiding multidrug resistance. Overall there is modest evidence regarding the protective effects of nutrients from supplements against a number of cancers. Numerous scientific literatures available advocate the use of polyphenols for chemoprevention. Some groups have also suggested use of combination of nutrients in cancer prevention. However, we have yet to obtain the desired results in the line of cancer chemotherapy research. Nanotechnology can play a pivotal role in cancer treatment and prevention. Moreover, nanoparticles can be modified in various ways to prolong circulation, enhance drug localization, increase drug efficacy, and potentially decrease the chances of multidrug resistance. In this communication, we will cover the use of various polyphenols and nutrients in cancer chemoprevention. The application of nanotechnology in this regard will also be included. In view of available reports on the potential of nanoparticles, we suggest their usage along with different combination of nutrients as cancer chemotherapeutic agents.
Collapse
Affiliation(s)
- Shams Tabrez
- King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Einspahr JG, Calvert V, Alberts DS, Curiel-Lewandrowski C, Warneke J, Krouse R, Stratton SP, Liotta L, Longo C, Pellacani G, Pellicani G, Prasad A, Sagerman P, Bermudez Y, Deng J, Bowden GT, Petricoin EF. Functional protein pathway activation mapping of the progression of normal skin to squamous cell carcinoma. Cancer Prev Res (Phila) 2012; 5:403-13. [PMID: 22389437 PMCID: PMC3297971 DOI: 10.1158/1940-6207.capr-11-0427] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Reverse phase protein microarray analysis was used to identify cell signaling derangements in squamous cell carcinoma (SCC) compared with actinic keratosis (AK) and upper inner arm (UIA). We analyzed two independent tissue sets with isolation and enrichment of epithelial cells by laser capture microdissection. Set 1 served as a pilot and a means to identify protein pathway activation alterations that could be further validated in a second independent set. Set 1 was comprised of 4 AK, 13 SCC, and 20 UIA. Set 2 included 15 AK, 9 SCCs, and 20 UIAs. Activation of 51 signaling proteins, known to be involved in tumorigenesis, were assessed for set 1 and showed that the MEK-ERK [mitogen-activated protein (MAP)/extracellular signal-regulated (ERK; MEK)] pathway was activated in SCC compared with AK and UIA, and that epidermal growth factor receptor (EGFR) and mTOR pathways were aberrantly activated in SCC. Unsupervised two-way hierarchical clustering revealed that AK and UIA shared a common signaling network activation architecture while SCC was dramatically different. Statistical analysis found that prosurvival signaling through phosphorylation of ASK and 4EBP1 as well as increased Bax and Bak expression was higher in AK compared with UIA. We expanded pathway network activation mapping in set 2 to 101 key signaling proteins, which corroborated activation of MEK-ERK, EGFR, and mTOR pathways through discovery of a number of upstream and downstream signaling molecules within these pathways to conclude that SCC is indeed a pathway activation-driven disease. Pathway activation mapping of SCC compared with AK revealed several interconnected networks that could be targeted with drug therapy for potential chemoprevention and therapeutic applications.
Collapse
Affiliation(s)
- Janine G Einspahr
- University of Arizona Cancer Center, 1515 North Campbell Avenue, Tucson, AZ 85724, USA.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Gosslau A, En Jao DL, Huang MT, Ho CT, Evans D, Rawson NE, Chen KY. Effects of the black tea polyphenol theaflavin-2 on apoptotic and inflammatory pathways in vitro and in vivo. Mol Nutr Food Res 2011; 55:198-208. [PMID: 20669245 DOI: 10.1002/mnfr.201000165] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
SCOPE Theaflavin-2 (TF-2), a major component of black tea extract, induces apoptosis of human colon cancer cells and suppresses serum-induced cyclooxygenase-2 (COX-2) expression 1. Here, we explored the mechanisms for activation of apoptosis, evaluated the impact on inflammatory genes in a broader panel of cells and tested whether topical anti-inflammatory effects could be observed in vivo. METHODS AND RESULTS TF-2 triggered apoptosis in five other transformed cancer cell lines, inducing cell shrinkage, membrane blebbing, and mitochondrial clustering within 3 h of treatment. Among a set of pro-apoptotic genes, TF-2 quickly induced the up-regulation of P53 and BAX, suggesting mitochondria as the primary target. Using a cell model for inflammatory response, we showed that TF-2 suppressed the 12-O-tetradecanoylphorbol-13-acetate-induced COX-2 gene expression, and also down-regulated TNF-α, iNOS, ICAM-1, and NFκB. A reporter gene assay showed that TF-2 down-regulated COX-2 at the transcriptional level. We also demonstrated that TF-2 exhibited anti-inflammatory activity in two mouse models of inflammation. Topical application with TF-2 significantly reduced ear edema and produced a pattern of gene down-regulation similar to that observed in the cell model. CONCLUSION These results suggest that the anti-inflammatory and pro-apoptotic activity of TF-2 may be exploited therapeutically in cancer and other diseases associated with inflammation.
Collapse
Affiliation(s)
- Alexander Gosslau
- WellGen Inc., Commercialization Center for Innovative Technologies, North Brunswick, NJ 08854-8087, USA.
| | | | | | | | | | | | | |
Collapse
|
15
|
Abstract
Dual-specificity tyrosine phosphorylation-regulated kinase 1A (DYRK1A) is a protein kinase with diverse functions in neuronal development and adult brain physiology. Higher than normal levels of DYRK1A are associated with the pathology of neurodegenerative diseases and have been implicated in some neurobiological alterations of Down syndrome, such as mental retardation. It is therefore important to understand the molecular mechanisms that control the activity of DYRK1A. Here we review the current knowledge about the initial self-activation of DYRK1A by tyrosine autophosphorylation and propose that this mechanism presents an ancestral feature of the CMGC group of kinases. However, tyrosine phosphorylation does not appear to regulate the enzymatic activity of DYRK1A. Control of DYRK1A may take place on the level of gene expression, interaction with regulatory proteins and regulated nuclear translocation. Finally, we compare the properties of small molecule inhibitors that target DYRK1A and evaluate their potential application and limitations. The β-carboline alkaloid harmine is currently the most selective and potent inhibitor of DYRK1A and has proven very useful in cellular assays.
Collapse
Affiliation(s)
- Walter Becker
- Institute of Pharmacology and Toxicology, Medical Faculty of the RWTH Aachen University, Aachen, Germany.
| | | |
Collapse
|
16
|
Gosslau A, Li S, Ho CT, Chen KY, Rawson NE. The importance of natural product characterization in studies of their anti-inflammatory activity. Mol Nutr Food Res 2010; 55:74-82. [DOI: 10.1002/mnfr.201000455] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2010] [Revised: 10/31/2010] [Accepted: 11/02/2010] [Indexed: 12/31/2022]
|
17
|
Jayaraman P, Sakharkar MK, Lim CS, Tang TH, Sakharkar KR. Activity and interactions of antibiotic and phytochemical combinations against Pseudomonas aeruginosa in vitro. Int J Biol Sci 2010; 6:556-68. [PMID: 20941374 PMCID: PMC2952406 DOI: 10.7150/ijbs.6.556] [Citation(s) in RCA: 119] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2010] [Accepted: 09/16/2010] [Indexed: 11/15/2022] Open
Abstract
In this study the in vitro activities of seven antibiotics (ciprofloxacin, ceftazidime, tetracycline, trimethoprim, sulfamethoxazole, polymyxin B and piperacillin) and six phytochemicals (protocatechuic acid, gallic acid, ellagic acid, rutin, berberine and myricetin) against five P. aeruginosa isolates, alone and in combination are evaluated. All the phytochemicals under investigation demonstrate potential inhibitory activity against P. aeruginosa. The combinations of sulfamethoxazole plus protocatechuic acid, sulfamethoxazole plus ellagic acid, sulfamethoxazole plus gallic acid and tetracycline plus gallic acid show synergistic mode of interaction. However, the combinations of sulfamethoxazole plus myricetin shows synergism for three strains (PA01, DB5218 and DR3062). The synergistic combinations are further evaluated for their bactericidal activity against P. aeruginosa ATCC strain using time-kill method. Sub-inhibitory dose responses of antibiotics and phytochemicals individually and in combination are presented along with their interaction network to suggest on the mechanism of action and potential targets for the phytochemicals under investigation. The identified synergistic combinations can be of potent therapeutic value against P. aeruginosa infections. These findings have potential implications in delaying the development of resistance as the antibacterial effect is achieved with lower concentrations of both drugs (antibiotics and phytochemicals).
Collapse
Affiliation(s)
- Premkumar Jayaraman
- Biomedical Engineering Research Centre, Nanyang Technological University, Singapore
| | | | | | | | | |
Collapse
|
18
|
Lee DE, Lee KW, Song NR, Seo SK, Heo YS, Kang NJ, Bode AM, Lee HJ, Dong Z. 7,3',4'-Trihydroxyisoflavone inhibits epidermal growth factor-induced proliferation and transformation of JB6 P+ mouse epidermal cells by suppressing cyclin-dependent kinases and phosphatidylinositol 3-kinase. J Biol Chem 2010; 285:21458-66. [PMID: 20444693 DOI: 10.1074/jbc.m109.094797] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Numerous in vitro and in vivo studies have shown that isoflavones exhibit anti-proliferative activity against epidermal growth factor (EGF) receptor-positive malignancies of the breast, colon, skin, and prostate. 7,3',4'-Trihydroxyisoflavone (7,3',4'-THIF) is one of the metabolites of daidzein, a well known soy isoflavone, but its chemopreventive activity and the underlying molecular mechanisms are poorly understood. In this study, 7,3',4'-THIF prevented EGF-induced neoplastic transformation and proliferation of JB6 P+ mouse epidermal cells. It significantly blocked cell cycle progression of EGF-stimulated cells at the G(1) phase. As shown by Western blot, 7,3',4'-THIF suppressed the phosphorylation of retinoblastoma protein at Ser-795 and Ser-807/Ser-811, which are the specific sites of phosphorylation by cyclin-dependent kinase (CDK) 4. It also inhibited the expression of G(1) phase-regulatory proteins, including cyclin D1, CDK4, cyclin E, and CDK2. In addition to regulating the expression of cell cycle-regulatory proteins, 7,3',4'-THIF bound to CDK4 and CDK2 and strongly inhibited their kinase activities. It also bound to phosphatidylinositol 3-kinase (PI3K), strongly inhibiting its kinase activity and thereby suppressing the Akt/GSK-3beta/AP-1 pathway and subsequently attenuating the expression of cyclin D1. Collectively, these results suggest that CDKs and PI3K are the primary molecular targets of 7,3',4'-THIF in the suppression of EGF-induced cell proliferation. These insights into the biological actions of 7,3',4'-THIF provide a molecular basis for the possible development of new chemoprotective agents.
Collapse
Affiliation(s)
- Dong Eun Lee
- The Hormel Institute, University of Minnesota, Austin, Minnesota 55912, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Chemical Carcinogenesis and Mutagenesis. Clin Toxicol (Phila) 2010. [DOI: 10.3109/9781420092264-32] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
20
|
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
| | | |
Collapse
|
21
|
Androutsopoulos V, Wilsher N, Arroo RRJ, Potter GA. Bioactivation of the phytoestrogen diosmetin by CYP1 cytochromes P450. Cancer Lett 2008; 274:54-60. [PMID: 18976853 DOI: 10.1016/j.canlet.2008.08.032] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2008] [Revised: 05/30/2008] [Accepted: 08/29/2008] [Indexed: 01/16/2023]
Abstract
Breast cancer is a major cause of death worldwide. Amongst the various forms of treatment chemoprevention is favoured and natural products such as the dietary flavonoids have been examined for their cancer preventative activity. In this study we investigated the anticancer activity of the flavonoid diosmetin, as a result of cytochrome P450 CYP1 metabolism. Diosmetin was metabolized to luteolin via an aromatic demethylation reaction on the B-ring from CYP1A1, CYP1B1 and the hepatic isozyme CYP1A2. CYP1A1 and CYP1A2 also produced additional unidentified metabolites. CYP1B1 showed the lowest apparent KM and CYP1A1 the highest apparent Kcat. Diosmetin was also metabolized to luteolin in estrogen receptor positive breast cell-line (MCF-7 cells) preinduced for 24 h with the potent CYP1 inducer 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). Treatment of MCF-7 cells with TCDD caused bioactivation of diosmetin enhancing its cytotoxicity. Taken together these data suggest that the flavonoid diosmetin is metabolised to the more active molecule luteolin by CYP1 family enzymes.
Collapse
Affiliation(s)
- Vasilis Androutsopoulos
- Leicester School of Pharmacy, De Montfort University, The Gateway, Leicester LE1 9BH, United Kingdom
| | | | | | | |
Collapse
|
22
|
Bode A, Dong Z. Modulation of Cell Signal Transduction by Tea and Ginger. OXIDATIVE STRESS AND DISEASE 2008. [DOI: 10.1201/9780849381492.ch2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/06/2022]
|
23
|
Einspahr JG, Timothy Bowden G, Alberts DS, McKenzie N, Saboda K, Warneke J, Salasche S, Ranger-Moore J, Curiel-Lewandrowski C, Nagle RB, Nickoloff BJ, Brooks C, Dong Z, Stratton SP. Cross-validation of Murine UV Signal Transduction Pathways in Human Skin. Photochem Photobiol 2008; 84:463-76. [DOI: 10.1111/j.1751-1097.2007.00287.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
|
24
|
Modulatory effects of polyphenols on apoptosis induction: relevance for cancer prevention. Int J Mol Sci 2008; 9:213-228. [PMID: 19325744 PMCID: PMC2635670 DOI: 10.3390/ijms9030213] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2007] [Revised: 11/30/2007] [Accepted: 01/23/2008] [Indexed: 12/17/2022] Open
Abstract
Polyphenols, occurring in fruit and vegetables, wine, tea, extra virgin olive oil, chocolate and other cocoa products, have been demonstrated to have clear antioxidant properties in vitro, and many of their biological actions have been attributed to their intrinsic reducing capabilities. However, it has become clear that, in complex biological systems, polyphenols exhibit several additional properties which are yet poorly understood. Apoptosis is a genetically controlled and evolutionarily conserved form of cell death of critical importance for the normal embryonic development and for the maintenance of tissue homeostasis in the adult organism. The malfunction of the death machinery may play a primary role in various pathological processes, since too little or too much apoptosis can lead to proliferative or degenerative diseases, respectively. Cancer cells are characterized by a deregulated proliferation, and/or an inability to undergo programmed cell death. A large body of evidence indicates that polyphenols can exert chemopreventive effects towards different organ specific cancers, affecting the overall process of carcinogenesis by several mechanisms: inhibition of DNA synthesis, modulation of ROS production, regulation of cell cycle arrest, modulation of survival/proliferation pathways. In addition, polyphenols can directly influence different points of the apoptotic process, and/or the expression of regulatory proteins. Although the bulk of data has been obtained in in vitro systems, a number of clinical studies suggesting a preventive and therapeutic effectiveness of polyphenols in vivo is available. However, a deeper knowledge of the underlying mechanisms responsible for the modulation of apoptosis by polyphenols, and their real effectiveness, is necessary in order to propose them as potential chemopreventive and chemotherapeutic candidates for cancer treatment.
Collapse
|
25
|
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.
Collapse
Affiliation(s)
- Evgeny A Rogozin
- Hormel Institute, University of Minnesota, Austin, MN 55912, USA
| | | | | | | | | | | | | | | | | |
Collapse
|