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Gaur R, Ke JP, Zhang P, Yang Z, Bao GH. Novel Cinnamoylated Flavoalkaloids Identified in Tea with Acetylcholinesterase Inhibition Effect. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:3140-3148. [PMID: 32053361 DOI: 10.1021/acs.jafc.9b08285] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
3-O-Cinnamoylepicatechin (1) was synthesized along with four flavoalkaloids, (-)-6-(5‴S)-N-ethyl-2-pyrrolidinone-3-O-cinnamoylepicatechin (2), (-)-6-(5‴R)-N-ethyl-2-pyrrolidinone-3-O-cinnamoylepicatechin (3), (-)-8-(5‴S)-N-ethyl-2-pyrrolidinone-3-O-cinnamoylepicatechin (4), and (-)-8-(5‴R)-N-ethyl-2-pyrrolidinone-3-O-cinnamoylepicatechin (5) via esterification of epicatechin followed by phenolic Mannich reaction of 1 with theanine in the presence of heat. The new compounds 1-5 were detected in leaves of three tea cultivars, Fuding-Dabai, Huangjingui, and Zimudan with the help of ultra-performance liquid chromatography hyphenated with a photodiode array detector and electrospray ionization high-resolution mass spectrometry (UPLC-PDA-ESI-HRMS), suggesting that they are naturally occurring in tea leaves. The structures of the novel natural products were characterized by one- and two-dimensional nuclear magnetic resonance (1D and 2D NMR) and mass spectroscopy. Compounds 1-5 were then evaluated for their acetylcholinesterase (AChE) inhibitory effect (IC50 = 0.12-1.02 μM). The availability of the synthesized epicatechin derivatives 1-5 via a synthetic route enabled the first unequivocal identification of these derivatives as tea secondary metabolites and made it possible to determine their content in the tea material as well as the diverse bioactivities.
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Affiliation(s)
- Rashmi Gaur
- Natural Products Laboratory, International Joint Laboratory of Tea Chemistry and Health Effects, State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China
| | - Jia-Ping Ke
- Natural Products Laboratory, International Joint Laboratory of Tea Chemistry and Health Effects, State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China
| | - Peng Zhang
- Natural Products Laboratory, International Joint Laboratory of Tea Chemistry and Health Effects, State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China
| | - Zi Yang
- Natural Products Laboratory, International Joint Laboratory of Tea Chemistry and Health Effects, State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China
| | - Guan-Hu Bao
- Natural Products Laboratory, International Joint Laboratory of Tea Chemistry and Health Effects, State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China
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2
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García DE, Glasser WG, Pizzi A, Paczkowski SP, Laborie MP. Modification of condensed tannins: from polyphenol chemistry to materials engineering. NEW J CHEM 2016. [DOI: 10.1039/c5nj02131f] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Condensed tannins (CTs) are high molar mass polyphenolic bio-polymers based on flavonol units.
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Affiliation(s)
- Danny E. García
- Área Productos Químicos
- Unidad de Desarrollo Tecnológico (UDT)
- Universidad de Concepción
- Bio-Bio
- Chile
| | - Wolfgang G. Glasser
- Department of Sustainable Biomaterials
- Virginia Polytechnic Institute and State University
- Blacksburg
- USA
| | - Antonio Pizzi
- Laboratoire d'Etudes et de Recherche sur le Matériau Bois (LERMAB)
- University of Lorraine
- Epinal
- France
- Department of Physics
| | - Sebastian P. Paczkowski
- Freiburger Materialforschungszentrum–FMF
- Albert-Ludwigs University of Freiburg
- Freiburg
- Germany
- Chair of Forest Biomaterials
| | - Marie-Pierre Laborie
- Freiburger Materialforschungszentrum–FMF
- Albert-Ludwigs University of Freiburg
- Freiburg
- Germany
- Chair of Forest Biomaterials
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Kumar D, Poornima M, Kushwaha RN, Won TJ, Ahn C, Ganesh Kumar C, Jang K, Shin DS. Antimicrobial and docking studies of (−)-catechin derivatives. ACTA ACUST UNITED AC 2015. [DOI: 10.1007/s13765-015-0079-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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4
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Liu L, Jin C, Zhang Y. Lipophilic phenolic compounds (Lipo-PCs): emerging antioxidants applied in lipid systems. RSC Adv 2014. [DOI: 10.1039/c3ra44792h] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Bansal S, Vyas S, Bhattacharya S, Sharma M. Catechin prodrugs and analogs: a new array of chemical entities with improved pharmacological and pharmacokinetic properties. Nat Prod Rep 2013; 30:1438-54. [DOI: 10.1039/c3np70038k] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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6
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Vyas S, Manon B, Vir Singh T, Dev Sharma P, Sharma M. Potential O-Acyl-Substituted (−)-Epicatechin Gallate Prodrugs as Inhibitors of DMBA/TPA-Induced Squamous Cell Carcinoma of Skin in Swiss Albino Mice. Chem Biodivers 2011; 8:599-613. [DOI: 10.1002/cbdv.201000219] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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7
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Ahmed K, Wei ZL, Zhao QL, Nakajima N, Matsunaga T, Ogasawara M, Kondo T. Role of fatty acid chain length on the induction of apoptosis by newly synthesized catechin derivatives. Chem Biol Interact 2010; 185:182-8. [PMID: 20206613 DOI: 10.1016/j.cbi.2010.02.045] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2010] [Revised: 02/25/2010] [Accepted: 02/25/2010] [Indexed: 02/06/2023]
Abstract
The catechins, a family of polyphenols found in tea, can evoke various responses, including apoptosis. In this study we investigated whether the chemical modification of (-)-epigallocatechin gallate (EGCG) could enhance its apoptosis activity. We found that one of the catechin conjugated with capric acid [(2R,3S)-3',4',5,7-tetrahydroxyflavan-3-yl decanoate; catechin-C10] was most potent to induce apoptosis in U937 cells. C10 treatment resulted in a significant increase in reactive oxygen species (ROS) formation, mitochondrial membrane potential (MMP) loss, cytochrome c release caspase-9 and caspase-3 activation. In addition to this C10 also activated extrinsic pathway significantly as evident by time-dependent increase in Fas expression and caspase-8 activity. C10 mediated cleavage of Bid may be an important event for cross talk between intrinsic and extrinsic signaling. Moreover, pre-treatment of cells with anti-oxidant N-acetyl-L-cysteine (NAC) significantly prevented C10-induced apoptosis but did not protect MMP loss. Treatment of cells with pan-caspase inhibitor significantly inhibited apoptosis indicating that caspases are playing key role. In addition to this C10 was found to induce apoptosis in human colon cancer (HCT116) cells while it showed resistance to human keratinocytes (HaCat). In short our results showed that the optimal fatty acid side chain length is required for the apoptosis inducing activity of catechin derivatives in U937 cells.
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Affiliation(s)
- Kanwal Ahmed
- Department of Radiological Sciences, Graduate School of Medical and Pharmaceutical Sciences, University of Toyama Japan, 2630 Sugitani, Toyama 930-0194, Japan
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8
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Synthesis and antimicrobial activities of 3-O-alkyl analogues of (+)-catechin: Improvement of stability and proposed action mechanism. Eur J Med Chem 2010; 45:1028-33. [DOI: 10.1016/j.ejmech.2009.11.045] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2009] [Revised: 11/17/2009] [Accepted: 11/20/2009] [Indexed: 11/18/2022]
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9
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Luo C, Grigsby W, Edmonds N, Easteal A, Al-Hakkak J. Synthesis, characterization, and thermal behaviors of tannin stearates prepared from quebracho and pine bark extracts. J Appl Polym Sci 2010. [DOI: 10.1002/app.31545] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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10
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Song JM, Park KD, Lee KH, Byun YH, Park JH, Kim SH, Kim JH, Seong BL. Biological evaluation of anti-influenza viral activity of semi-synthetic catechin derivatives. Antiviral Res 2007; 76:178-85. [PMID: 17709148 DOI: 10.1016/j.antiviral.2007.07.001] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2007] [Revised: 07/03/2007] [Accepted: 07/05/2007] [Indexed: 12/01/2022]
Abstract
Catechin derivatives with different alkyl chain length and aromatic ring substitutions at the 3-hydroxyl group were synthesized from epigallocatechin (EGC) and (+)-catechin (C) and their anti-influenza viral activity were evaluated in vitro and in ovo. Pronounced antiviral activity was observed for derivatives carrying moderate chain length (7-9 carbons) as compared to those with aromatic rings, whereas the 5'-hydroxyl group of the trihydroxy benzyl moiety did not significantly contribute to antiviral activity. The derivatives exerted inhibitory effects for all six influenza subtypes tested including three major types of currently circulating human influenza viruses (A/H1N1, A/H3N2 and B type), H2N2 and H9N2 avian influenza virus. The compounds strongly inhibited adsorption of the viruses on red blood cell (RBC). They also restricted the growth of avian influenza virus in ovo with minimum inhibition concentration (MIC) of 5-10 microM far exceeding the neuraminidase (NA) inhibitor oseltamivir or M2 proton channel inhibitor amantadine. The antiviral activity appears to be mediated by interaction with hemagglutinin (HA)/viral membrane rendering HA less fusogenic at the initial stage of infection. The broad spectrum activity against various subtypes of influenza viruses may complement the limitations of current antivirals and contribute for managing potentially emerging influenza pandemic. The structure-activity data of catechin derivatives may usefully guideline future research endeavors for applying green tea catechins as alternative anti-viral agents.
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Affiliation(s)
- Jae Min Song
- Department of Biotechnology, College of Engineering, Yonsei University, Seoul, South Korea
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11
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Matsubara K, Saito A, Tanaka A, Nakajima N, Akagi R, Mori M, Mizushina Y. Epicatechin conjugated with fatty acid is a potent inhibitor of DNA polymerase and angiogenesis. Life Sci 2007; 80:1578-85. [PMID: 17328920 DOI: 10.1016/j.lfs.2007.01.049] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2006] [Revised: 01/12/2007] [Accepted: 01/18/2007] [Indexed: 11/30/2022]
Abstract
Anti-cancer and anti-angiogenesis effects of green tea catechins have been demonstrated. It has been found that chemical modification of tea catechins improves their biological activities. We examined the chemical modification of epicatechin enhanced anti-cancer and anti-angiogenic effects. Epicatechin conjugated with fatty acid (acyl-catechin) strongly inhibited DNA polymerase activity, HL-60 cancer cell growth and angiogenesis. Epicatechin conjugated with palmitic acid ((2R,3R)-3',4',5,7-tetrahydroxyflavan-3-yl hexadecanoate, epicatechin-C16) was the strongest inhibitor in DNA polymerase alpha, beta, lambda and angiogenesis assays. Epicatechin-C16 also suppressed human endothelial cell (HUVEC) tube formation on reconstituted basement membrane, suggesting that it affected not only DNA polymerase activity but also the signal transduction pathways needed for the tube formation in HUVECs. These results suggest that acylation of epicatechin is an effective chemical modification to improve the anti-cancer activity of epicatechin.
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Affiliation(s)
- Kiminori Matsubara
- Department of Nutritional Science, Faculty of Health and Welfare Science, Okayama Prefectural University, Soja, Okayama 719-1197, Japan.
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Matsubara K, Saito A, Tanaka A, Nakajima N, Akagi R, Mori M, Mizushina Y. Catechin conjugated with fatty acid inhibits DNA polymerase and angiogenesis. DNA Cell Biol 2006; 25:95-103. [PMID: 16460233 DOI: 10.1089/dna.2006.25.95] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Catechins in green tea have anticancer and antiangiogenesis activities, with epigallocatechin-3-gallate (EGCG) being the most potent antiangiogenic tea catechin. This study examined whether chemical modification of catechin enhanced anticancer and antiangiogenic effects. Catechin, conjugated with fatty acid (acyl-catechin), strongly inhibited DNA polymerase, HL-60 cancer cell growth, and angiogenesis. Catechin conjugated with stearic acid [(2R,3S)-3',4',5,7-tetrahydroxyflavan-3-yl octadecanoate; catechin-C18] was the strongest inhibitor in DNA polymerase alpha and beta and angiogenesis assays. Catechin-C18 also suppressed human endothelial cell (HUVEC) tube formation on the reconstituted basement membrane, suggesting that it affected not only DNA polymerases but also signal transduction pathways in HUVECs. These data indicate that acyl-catechins target both DNA polymerases and angiogenesis as anticancer agents. These results suggest that acylation of catechin is an effective chemical modification to improve the anticancer activity of catechin.
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Affiliation(s)
- Kiminori Matsubara
- Department of Nutritional Science, Faculty of Health and Welfare Science, Okayama Prefectural University, Soja, Okayama 719-1197, Japan.
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Aoshima H, Okita Y, Hossain SJ, Fukue K, Mito M, Orihara Y, Yokoyama T, Yamada M, Kumagai A, Nagaoka Y, Uesato S, Hara Y. Effect of 3-O-octanoyl-(+)-catechin on the responses of GABA(A) receptors and Na+/glucose cotransporters expressed in xenopus oocytes and on the oocyte membrane potential. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2005; 53:1955-1959. [PMID: 15769120 DOI: 10.1021/jf048492c] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Recently, 3-O-octanoyl-(+)-catechin (OC) was synthesized from (+)-catechin (C) by incorporation of an octanoyl chain into C in the light of (-)-epicatechin gallate (ECg) and (-)-epigallocatechin gallate (EGCg), which are the major polyphenols found in green tea and have strong physiological activities. OC was found to inhibit the response of ionotropic gamma-aminobutyric acid (GABA) receptors (GABA(A) receptors) and Na+/glucose cotransporters expressed in Xenopus oocytes in a noncompetitive manner more strongly than does C. OC also induced a nonspecific membrane current and decreased the membrane potential of the oocyte, and thus death of the oocyte occurred even at lower concentrations than that induced by C or EGCg. Although EGCg produced H2O2 in aqueous solution, OC did not. This newly synthesized catechin derivative OC possibly binds to the lipid membrane more strongly than does C, Ecg, or EGCg and as a result perturbs the membrane structure.
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Affiliation(s)
- Hitoshi Aoshima
- Department of Physics, Biology and Informatics, Faculty of Science, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8512, Japan.
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Nakagawa K, Fujii S, Ohgi A, Uesato S. Antioxidative Activity of 3-O-Octanoyl-(+)-Catechin, a Newly Synthesized Catechin, in Vitro. ACTA ACUST UNITED AC 2005. [DOI: 10.1248/jhs.51.492] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Kazuo Nakagawa
- Department of Food and Nutrition, Kyoto Women's University
| | - Seiko Fujii
- Department of Food and Nutrition, Kyoto Women's University
| | - Akiko Ohgi
- Department of Food and Nutrition, Kyoto Women's University
| | - Shinichi Uesato
- Department of Biotechnology, Faculty of Engineering, Kansai University
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Park KD, Lee SG, Kim SU, Kim SH, Sun WS, Cho SJ, Jeong DH. Anticancer activity of 3-O-acyl and alkyl-(−)-epicatechin derivatives. Bioorg Med Chem Lett 2004; 14:5189-92. [PMID: 15380225 DOI: 10.1016/j.bmcl.2004.07.063] [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] [Received: 10/08/2003] [Accepted: 07/26/2004] [Indexed: 11/25/2022]
Abstract
By changing the structure or replacing the gallate group of (-)-ECG, 3-O-acyl and alkyl-(-)-epicatechin derivatives were synthesized to be screen as anticancer agents using the MTT assay in vitro against cancer cell lines (PC3, SKOV3, U373MG). 3-O-Acyl and alkyl-(-)-epicatechin derivatives (4-25) exhibited better anticancer activity than (-)-ECG and specially, compounds 6-8, 17-19, which were modified aliphatic chains with moderate sizes (C8-C12) showed strong anticancer activity (IC50=6.4-31.2 microM). The introduction of an alkyloxy group on 3-O-hydroxyl instead of an acyloxy group significantly enhanced inhibitory activity. Consequently, the compound that showed the most potency as anticancer agents were 3-O-decyl-(-)-epicatechin (18) (IC50=8.9, 7.9, 6.4 microM against PC3, SKOV3, U373MG, respectively), which modified the appropriate lipophilic group on the C-3 hydroxyl as an alkyloxy group.
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Affiliation(s)
- Ki Duk Park
- Laboratory of Cellular Function Modulator, Korea Research Institute of Bioscience and Biotechnology, Yusung, Taejon 305-333, Korea.
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Takabayashi F, Nakamura Y, Harada N. Effect of black tea aqueous non-dialysate onHelicobacter pylori infection in Mongolian gerbils. Environ Health Prev Med 2004; 9:176-80. [PMID: 21432329 PMCID: PMC2723575 DOI: 10.1007/bf02898098] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2004] [Accepted: 04/21/2004] [Indexed: 12/17/2022] Open
Abstract
OBJECTIVES Recently, the appearance ofHelicobacter pylori (H. pylori) resistant to antibiotics has been reported. The development of an antibiotic therapy which would not induce resistant strains ofH. pylori is anticipated. In the present study, the antibiotic effect of black tea aqueous non-dialysate (BTND), the fraction different from tea catechins, onH. pylori was investigated using Mongolian gerbils infected withH. pylori. METHODS BTND was extracted from black tea leaves. A 0.1 w/v% solution of BTND or green tea catechins (GTC) was provided as drinking water to male NGS/Sea Mongolian gerbils infected withH. pylori (ATCC43504) for two weeks. Their stomachs were then excised, the mucosal surfaces were macroscopically observed, and colony forming units (CFU) ofH. pylori were counted. The data were compared between the BTND and GTC groups. RESULTS The CFU ofH. pylori were significantly decreased by intake of BTND. The body weight of the animals tended to be larger in the group supplied with BTND than in that supplied with GTC. Gastric mucosal injury tended to be smaller in the animals supplied with BTND than in those with GTC. CONCLUSIONS These results suggest that BTND may have an inhibitory effect onH. pylori infection.
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Affiliation(s)
- Fumiyo Takabayashi
- Junior College, University of Shizuoka, 2-2-1 Oshika, 422-8021, Shizuoka-shi, Shizuoka Prefecture, Japan,
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Ito C, Itoigawa M, Kanematsu T, Ruangrungsi N, Higashihara H, Tokuda H, Nishino H, Furukawa H. New cinnamylphenols from Dalbergia species with cancer chemopreventive activity. JOURNAL OF NATURAL PRODUCTS 2003; 66:1574-1577. [PMID: 14695799 DOI: 10.1021/np0302450] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Five new cinnamylphenols (1,3-diphenylpropenes), dalberatins A (1), B (2), C (3), D (4), and E (5), were isolated from plants of the Dalbergia species. They were characterized and tested for their inhibitory activities against Epstein-Barr virus early antigen activation induced by 12-O-tetradecanoylphorbol-13-acetate in Raji cells. The cinnamylphenols were found to show remarkably potent activities. The result of the present investigation indicated that some of these cinnamylphenols might be valuable as potential cancer chemopreventive agents (anti-tumor promoters).
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Affiliation(s)
- Chihiro Ito
- Faculty of Pharmacy, Meijo University, Tempaku, Nagoya 468-8503, Japan
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18
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Kumagai A, Nagaoka Y, Obayashi T, Terashima Y, Tokuda H, Hara Y, Mukainaka T, Nishino H, Kuwajima H, Uesato S. Tumor chemopreventive activity of 3- O -acylated (−)-epigallocatechins. Bioorg Med Chem 2003; 11:5143-8. [PMID: 14604677 DOI: 10.1016/j.bmc.2003.08.016] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
In order to seek promising cancer chemopreventive agents, we assessed the antitumor promoting activities of 3-O-octanoyl- or 3-O-(2-methyloctanoyl)-(--)-epigallocatechins, inhibiting markedly the activation of Epstein-Barr virus early antigen, in a two-stage mouse skin carcinogenesis assay. As a result, these derivatives inhibited a papilloma formation 1.3-1.6-fold more strongly than (--)-epigallocatechin gallate well established as anti-tumor promoter.
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Affiliation(s)
- Ayako Kumagai
- Department of Biotechnology, Faculty of Engineering, Kansai University, Suita, Osaka 564-8680, Japan
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Uesato S, Taniuchi K, Kumagai A, Nagaoka Y, Seto R, Hara Y, Tokuda H, Nishino H. Inhibitory Effects of 3-O-Acyl-(+)-catechins on Epstein-Barr Virus Activation. Chem Pharm Bull (Tokyo) 2003; 51:1448-50. [PMID: 14646330 DOI: 10.1248/cpb.51.1448] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In the course of an exploratory investigation of antitumor-promoting catechins, 3-O-acyl-(+)-catechins of varying carbon lengths from C(4) to C(18) were assessed for inhibitory effects on the activation of the Epstein-Barr virus early antigen. Like 3-O-acyl-(-)-epigallocatechins, the (+)-catechin derivatives showed promising effects with the C-3 acyl chain of C(8)-C(11) carbon atoms.
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Affiliation(s)
- Shinichi Uesato
- Department of Biotechnology, Faculty of Engineering, Kansai University, Suita, Osaka, Japan.
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Uesato S, Kitagawa Y, Kaijima T, Tokuda H, Okuda M, Mou XY, Mukainaka T, Nishino H. Inhibitory effects of 6-O-acylated L-ascorbic acids possessing a straight- or branched-acyl chain on Epstein-Barr virus activation. Cancer Lett 2001; 166:143-6. [PMID: 11311486 DOI: 10.1016/s0304-3835(01)00444-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
6-O-Acylated L-ascorbic acids possessing a straight- or branched-acyl chain of varying length from C(4) to C(18) have been synthesized and evaluated their anti-tumor promoting effects on the activation of the Epstein-Barr virus early antigen. The derivatives having a straight- or branched-acyl chain of C(6) to C(11) carbon atoms exhibited marked effects.
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Affiliation(s)
- S Uesato
- Department of Biotechnology, Faculty of Engineering, Kansai University, Suita, 564-8680, Osaka, Japan.
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