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de Carvalho JCB, de Oliveira IM, Trindade C, Juchem ALM, da Silva Machado M, Guecheva TN, Moura S, de Souza LAG, Vainstein MH, Henriques JAP. Chemical characterization of Callingcard Vine (Entada polystachya (L.) DC. var. polystachya) aqueous seed extract and evaluation of its cytotoxic, genotoxic and mutagenic properties. MUTATION RESEARCH. GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2023; 891:503687. [PMID: 37770144 DOI: 10.1016/j.mrgentox.2023.503687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 08/18/2023] [Accepted: 08/24/2023] [Indexed: 10/03/2023]
Abstract
Callingcard Vine (Entada polystachya (L.) DC. var. polystachya - Fabaceae) is a common plant in coastal thickets from western Mexico through Central America to Colombia and Brazil, especially in Amazon biome. It has been popularly used as a urinary burning reliever and diuretic. However, the plant chemical constituents are poorly understood and Entada spp. genotoxic potential have not been previously investigated. In the present study we determined the chemical composition of the aqueous E. polystachya crude seed extract (EPCSE) and evaluated the cytotoxic, genotoxic and mutagenic properties of EPCSE in Salmonella typhimurium and Chinese hamster fibroblast (V79) cells. Cytotoxic activity was also evaluated in tumor cell lines (HT29, MCF7 and U87) and non-malignant cells (MRC5). The chemical analysis by High Resolution Mass Spectrometry (HRMS) of EPCSE indicated the presence of saponin and chalcone. The results of the MTT and clonal survival assays suggest that EPCSE is cytotoxic to V79 cells. Survival analysis showed higher IC50 in non-tumor compared with tumor cell lines. EPCSE showed induction of DNA strand breaks as revealed by the alkaline comet assay and micronucleus test. Using the modified comet assay, it was possible to detect the induction of oxidative DNA base damage by EPCSE in V79 cells. Consistently, the extract induced increase lipid peroxidation (TBARS), superoxide dismutase (SOD) and catalase (CAT) activities in V79 cells. In addition, EPCSE induced mutations in S. typhimurium TA98 and TA100 strains, confirming a mutagenic potential. Taken together, our results suggest that EPCSE is cytotoxic and genotoxic to V79 cells and mutagenic to S. typhimurium. These properties can be related to the pro-oxidant ability of the extract and induction of DNA lesions. Additionally, EPCSE could inhibit the growth of tumor cells, especially human colorectal adenocarcinoma (HT29) cell line, and can constitute a possible source of antitumor natural agents.
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Affiliation(s)
- Juliane Cristina Bugs de Carvalho
- Department of Biophysics, Federal University of Rio Grande do Sul, Porto Alegre, Brazil; Department of Molecular Biology and Biotechnology, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Iuri Marques de Oliveira
- Department of Biophysics, Federal University of Rio Grande do Sul, Porto Alegre, Brazil; Department of Genetics, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
| | - Cristiano Trindade
- Faculty of Basic and Biomedical Sciences, Simón Bolívar University, Barranquilla, Colombia
| | | | - Miriana da Silva Machado
- Department of Biophysics, Federal University of Rio Grande do Sul, Porto Alegre, Brazil; InnVitro Pesquisa e Desenvolvimento, Porto Alegre, RS, Brazil
| | - Temenouga Nikolova Guecheva
- Department of Biophysics, Federal University of Rio Grande do Sul, Porto Alegre, Brazil; Institute of Molecular Biology "Roumen Tsanev", Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Sidnei Moura
- Laboratory of Natural and Synthetics Products, University of Caxias do Sul, Caxias do Sul, RS, Brazil
| | - Luiz Augusto Gomes de Souza
- Environment and Health Society Coordination of the National Institute for Research in the Amazon (COSAS/INPA), Manaus, AM, Brazil
| | - Marilene Henning Vainstein
- Department of Molecular Biology and Biotechnology, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - João Antonio Pêgas Henriques
- Department of Biophysics, Federal University of Rio Grande do Sul, Porto Alegre, Brazil; Department of Molecular Biology and Biotechnology, Federal University of Rio Grande do Sul, Porto Alegre, Brazil; Department of Genetics, Federal University of Rio Grande do Sul, Porto Alegre, Brazil; InnVitro Pesquisa e Desenvolvimento, Porto Alegre, RS, Brazil; Postgraduate Programs in Biotechnology and Medical Sciences, University of Vale do Taquari - UNIVATES, Lajeado, RS, Brazil
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Tchegnitegni Toussie B, Nguengang RT, Mawabo IK, Teponno RB, Kezetas Bankeu JJ, Chouna JR, Nkenfou CN, Tapondjou LA, Sewald N, Lenta BN. Bioactive Arylnaphthalide Lignans from Justicia depauperata. JOURNAL OF NATURAL PRODUCTS 2022; 85:2731-2739. [PMID: 36469853 DOI: 10.1021/acs.jnatprod.2c00624] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Eleven previously undescribed arylnaphthalide lignans (1-11) together with seven known compounds were isolated from the whole plant of Justicia depauperata. The structures of 1-11 were elucidated by spectroscopic analysis and mass spectrometry. Compounds 6 (IC50 = 4.1 μM) and 9 (IC50 = 9.5 μM) displayed cytotoxic activity against the KB-3-1 cervical carcinoma cell line. This report provides an insight into the conformational equilibria occurring in the arylnaphthalide lignan constituents of this plant.
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Affiliation(s)
- Billy Tchegnitegni Toussie
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
- Organic and Bioorganic Chemistry, Faculty of Chemistry, University of Bielefeld, D-33501 Bielefeld, Germany
| | - Ruland Tchuinkeu Nguengang
- Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, P.O. Box 47, Yaoundé, Cameroon
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - Isabelle Kamga Mawabo
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Rémy Bertrand Teponno
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Jean Jules Kezetas Bankeu
- Department of Chemistry, Faculty of Science, The University of Bamenda, P.O. Box 39, Bambili, Cameroon
| | - Jean Rodolphe Chouna
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Celine Ngeufeu Nkenfou
- Department of Biology, Higher Teacher Training College, University of Yaoundé I, P.O. Box 47, Yaoundé, Cameroon
| | - Léon Azefack Tapondjou
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Norbert Sewald
- Organic and Bioorganic Chemistry, Faculty of Chemistry, University of Bielefeld, D-33501 Bielefeld, Germany
| | - Bruno Ndjakou Lenta
- Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, P.O. Box 47, Yaoundé, Cameroon
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Tsakem B, Tchuenguem RT, Siwe-Noundou X, Kemvoufo BP, Dzoyem JP, Teponno RB, Krause RWM, Tapondjou LA. New bioactive flavonoid glycosides with antioxidant activity from the stem bark of Olax subscorpioidea Oliv. Nat Prod Res 2022; 37:1641-1650. [PMID: 35921518 DOI: 10.1080/14786419.2022.2106566] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
A previously unreported gallocatechin glycoside, (2 R,3S) 4'-O-methyl-gallocatechin-3-O-α-ʟ-rhamnopyranoside (1) and an unseparable mixture of two previously undescribed dihydromyricetin glycosides, (2 R,3R) 4'-O-methyl-dihydromyricetin-3-O-α-ʟ-rhamnopyranoside (2a) and (2 R,3S) 4'-O-methyl-dihydromyricetin-3-O-α-ʟ-rhamnopyranoside (2 b) along with three known compounds were isolated from the n-butanol soluble fraction of the stem bark of Olax subscorpioidea Oliv. Their structures were elucidated by detailed spectroscopic analyses, including 1H NMR, 13C NMR, 1H-1H COSY, HSQC, HMBC, NOESY, HR-ESI-MS and chemical methods. The crude ethanol extract, the fractions, and some of the isolated compounds were screened for their antioxidant and antibacterial activities. They showed significant antioxidant activities with EC50 ranging from 6.29 to 18.19 µg/mL in 2,2-diphenyl-1-picrylhydrazyl (DPPH) method and EC50 ranging from 85.77 to 86.39 mmol FeSO4/g in ferric reducing antioxidant power (FRAP) methods compared with 2.29 µg/mL and 3.52 mmol FeSO4/g for the positive control (ʟ-ascorbic acid). Nevertheless, no inhibition was observed against the tested bacterial strains at a MIC less than 256 μg/mL.
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Affiliation(s)
- Bienvenu Tsakem
- Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | | | - Xavier Siwe-Noundou
- Department of Pharmaceutical Sciences, School of Pharmacy, Sefako Makgatho Health Sciences University, Pretoria, South Africa
| | | | - Jean Paul Dzoyem
- Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Rémy Bertrand Teponno
- Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
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Dai LP, Li W, Wang HX, Lu CH. Three new polyketides from vasR2 gene over-expressed mutant strain of Verrucosispora sp. NS0172. Chin J Nat Med 2021; 19:536-539. [PMID: 34247777 DOI: 10.1016/s1875-5364(21)60053-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Indexed: 10/20/2022]
Abstract
Over-expression of the pathway specific positive regulator gene is an effective way to activate silent gene cluster. In the curret study, the SARP family regulatory gene, vasR2, was over-expressed in strain Verrucosispora sp. NS0172 and the cryptic gene cluster responsible for the biosynthesis of pentaketide ansamycin was partially activated. Two tetraketides (1 and 2) and a triketide (3) ansamycins, together with five known compounds (4-8), were isolated and elucidated from strain NS0172OEvasR2. Their NMR data were completely assigned by analysis of their HR-ESI-MS and 1H, 13C NMR, HMQC, HMBC and 1H-1H COSY spectra.
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Affiliation(s)
- Li-Ping Dai
- Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan 250012, China
| | - Wen Li
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China
| | - Hao-Xin Wang
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China.
| | - Chun-Hua Lu
- Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan 250012, China.
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Holland DC, Kiefel MJ, Carroll AR. Structure Revisions of the Sponge-Derived Dibrominated Bis-indole Alkaloids, Echinosulfone A and the Echinosulfonic Acids A to D. J Org Chem 2020; 85:3490-3496. [DOI: 10.1021/acs.joc.9b03221] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Darren C. Holland
- Environmental Futures Research Institute, Griffith University, Southport 4222, Queensland, Australia
- School of Environment and Science, Griffith University, Southport 4222, Queensland, Australia
| | - Milton J. Kiefel
- School of Environment and Science, Griffith University, Southport 4222, Queensland, Australia
- Institute for Glycomics, Griffith University, Southport 4222, Queensland, Australia
| | - Anthony R. Carroll
- Environmental Futures Research Institute, Griffith University, Southport 4222, Queensland, Australia
- School of Environment and Science, Griffith University, Southport 4222, Queensland, Australia
- Griffith Institute for Drug Discovery, Griffith University, Nathan 4111, Queensland, Australia
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Kianfé BY, Teponno RB, Kühlborn J, Tchuenguem RT, Ponou BK, Helaly SE, Dzoyem JP, Opatz T, Tapondjou LA. Flavans and other chemical constituents of Crinum biflorum (Amaryllidaceae). BIOCHEM SYST ECOL 2019. [DOI: 10.1016/j.bse.2019.103953] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Petkowski JJ, Bains W, Seager S. Natural Products Containing a Nitrogen-Sulfur Bond. JOURNAL OF NATURAL PRODUCTS 2018; 81:423-446. [PMID: 29364663 DOI: 10.1021/acs.jnatprod.7b00921] [Citation(s) in RCA: 93] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Only about 100 natural products are known to contain a nitrogen-sulfur (N-S) bond. This review thoroughly categorizes N-S bond-containing compounds by structural class. Information on biological source, biological activity, and biosynthesis is included, if known. We also review the role of N-S bond functional groups as post-translational modifications of amino acids in proteins and peptides, emphasizing their role in the metabolism of the cell.
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Affiliation(s)
- Janusz J Petkowski
- Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - William Bains
- Rufus Scientific , 37 The Moor, Melbourn, Royston, Herts SG8 6ED, U.K
| | - Sara Seager
- Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
- Department of Physics, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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Sugimoto S, Matsunami K, Otsuka H. Biological activity of Entada phaseoloides and Entada rheedei. J Nat Med 2017; 72:12-19. [PMID: 29124496 DOI: 10.1007/s11418-017-1146-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Accepted: 10/24/2017] [Indexed: 11/26/2022]
Abstract
The aim of our study is to find functional compounds from natural resources. We focus on plants grown in tropical areas, especially Madagascar and Thailand, because they have unique flora and are expected to contain interesting compounds. We review the functional compounds of the seed kernels of Entada phaseoloides and E. rheedei and their biological activities such as anti-proliferation and melanogenesis inhibitory properties, etc.
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Affiliation(s)
- Sachiko Sugimoto
- Department of Pharmacognosy, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8553, Japan
| | - Katsuyoshi Matsunami
- Department of Pharmacognosy, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8553, Japan
| | - Hideaki Otsuka
- Faculty of Pharmacy, Yasuda Women's University, 6-13-1 Yasuhigashi, Asaminami-ku, Hiroshima, 731-0153, Japan.
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Pharmacological, ethnopharmacological, and botanical evaluation of subtropical medicinal plants of Lower Kheng region in Bhutan. Integr Med Res 2017; 6:372-387. [PMID: 29296564 PMCID: PMC5741394 DOI: 10.1016/j.imr.2017.08.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2017] [Revised: 08/04/2017] [Accepted: 08/17/2017] [Indexed: 01/08/2023] Open
Abstract
Background The Bhutanese Sowa Rigpa medicine (BSM) uses medicinal plants as the bulk ingredients. Our study was to botanically identify subtropical medicinal plants from the Lower Kheng region in Bhutan, transcribe ethnopharmacological uses, and highlight reported pharmacological activities of each plant. Methods We freely listed the medicinal plants used in the BSM literature, current formulations, and the medicinal plants inventory documents. This was followed by a survey and the identification of medicinal plants in the Lower Kheng region. The botanical identification of each medicinal plant was confirmed using The Plant List, eFloras, and TROPICOS. Data mining for reported pharmacological activities was performed using Google Scholar, Scopus, PubMed, and SciFinder Scholar. Results We identified 61 subtropical plants as the medicinal plants used in BSM. Of these, 17 plants were cultivated as edible plant species, 30 species grow abundantly, 24 species grow in moderate numbers, and only seven species were scarce to find. All these species grow within the altitude range of 100–1800 m above sea level. A total of 19 species were trees, and 13 of them were shrubs. Seeds ranked first in the parts usage category. Goshing Gewog (Block) hosted maximum number of medicinal plants. About 52 species have been pharmacologically studied and only nine species remain unstudied. Conclusion Lower Kheng region is rich in subtropical medicinal plants and 30 species present immediate economic potential that could benefit BSM, Lower Kheng communities and other Sowa Rigpa practicing organizations.
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Ivanov AV, Valuev-Elliston VT, Ivanova ON, Kochetkov SN, Starodubova ES, Bartosch B, Isaguliants MG. Oxidative Stress during HIV Infection: Mechanisms and Consequences. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2016; 2016:8910396. [PMID: 27829986 PMCID: PMC5088339 DOI: 10.1155/2016/8910396] [Citation(s) in RCA: 227] [Impact Index Per Article: 28.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Accepted: 09/18/2016] [Indexed: 12/15/2022]
Abstract
It is generally acknowledged that reactive oxygen species (ROS) play crucial roles in a variety of natural processes in cells. If increased to levels which cannot be neutralized by the defense mechanisms, they damage biological molecules, alter their functions, and also act as signaling molecules thus generating a spectrum of pathologies. In this review, we summarize current data on oxidative stress markers associated with human immunodeficiency virus type-1 (HIV-1) infection, analyze mechanisms by which this virus triggers massive ROS production, and describe the status of various defense mechanisms of the infected host cell. In addition, we have scrutinized scarce data on the effect of ROS on HIV-1 replication. Finally, we present current state of knowledge on the redox alterations as crucial factors of HIV-1 pathogenicity, such as neurotoxicity and dementia, exhaustion of CD4+/CD8+ T-cells, predisposition to lung infections, and certain side effects of the antiretroviral therapy, and compare them to the pathologies associated with the nitrosative stress.
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Affiliation(s)
- Alexander V. Ivanov
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov Str. 32, Moscow 119991, Russia
| | - Vladimir T. Valuev-Elliston
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov Str. 32, Moscow 119991, Russia
| | - Olga N. Ivanova
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov Str. 32, Moscow 119991, Russia
| | - Sergey N. Kochetkov
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov Str. 32, Moscow 119991, Russia
| | - Elizaveta S. Starodubova
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov Str. 32, Moscow 119991, Russia
- M. P. Chumakov Institute of Poliomyelitis and Viral Encephalitides, Moscow 142782, Russia
| | - Birke Bartosch
- Cancer Research Center Lyon, INSERM U1052 and CNRS 5286, Lyon University, 69003 Lyon, France
- DevWeCan Laboratories of Excellence Network (Labex), France
| | - Maria G. Isaguliants
- Riga Stradins University, Riga LV-1007, Latvia
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, 17177 Stockholm, Sweden
- N. F. Gamaleya Research Center of Epidemiology and Microbiology, Moscow 123098, Russia
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Braga EDS, Feitoza GV, Flores AS, Rodrigues RS. Entada (Leguminosae, Mimosoideae) em Roraima, Brasil. RODRIGUÉSIA 2016. [DOI: 10.1590/2175-7860201667319] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
Abstract
Resumo Entada é um gênero pantropical de Leguminosae (Mimosoideae) com 28 espécies. Este trabalho apresenta o estudo taxonômico de Entada para o estado de Roraima, norte do Brasil. Três táxons de Entada foram reconhecidos em Roraima, aqui tratados como espécies distintas: E. polyphylla, E. polystachya e E. simplicata. São apresentadas chave de identificação, descrições e ilustrações, bem como informações sobre distribuição geográfica, ambientes preferenciais e dispersão das espécies. O endemismo de E. simplicata e o primeiro registro de E. polyphylla fazem com que Roraima seja, até o momento, o único estado onde ocorrem todas as espécies de Entada registradas para o Brasil.
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Affiliation(s)
| | | | - Andréia Silva Flores
- Instituto de Amparo à Ciência, Tecnologia e Inovação do estado de Roraima, Brasil
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Nono RN, Nguelefack-Mbuyo EP, Nzowa LK, Ponou BK, Teponno RB, Nguelefack TB, Barboni L, Tapondjou LA, Park HJ. Antioxidant C-glycosylflavones of Drymaria cordata (Linn.) Willd. Arch Pharm Res 2015; 39:43-50. [PMID: 26642770 DOI: 10.1007/s12272-015-0691-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Accepted: 11/20/2015] [Indexed: 11/25/2022]
Abstract
A new C-glycosylflavone, drymaritin E (6-C-(3-keto-β-digitoxopyranosyl)-4'-O-(β-D-glucopyranosyl)-7-methoxyl-5,4'-dihydroxylflavone) 1 was isolated from the oily upper phase (SU) of the MeOH extract from aerial parts of Drymaria cordata together with two known compounds (cassiaoccidentalin A 2 and anemonin 3) and an inseparable mixture of two known C-glycosylflavones 5,4'-dihydroxy-7-methoxyflavone-6-C-(2''-O-α-L-rhamnopyranosyl)-β-D-glucopyranoside 4a and 5,7,3',4'-tetrahydroxyflavone-6-C-(2''-O-α-L-rhamnopyranosyl)-β-D-glucopyranoside 4b. The alkaline hydrolysis of 3 led to a new hemisynthetic derivative, sodium anemonate (sodium 2-((1'E) 2'-sodium-carboxylate-vinyl)-5-oxo-cyclohex-1-ene carboxylate) 3a. The chemical structures were determined by spectroscopic methods ((1)H NMR, (13)C NMR, (1)H-(1)H COSY, HMBC, HSQC, and NOESY) and mass spectrometry (ESI-MS). C-glycosylflavones had significant free radical-scavenging activities on the radical 2,2-diphenyl-1-picrylhydrazyl (DPPH). However, SU and compounds 3 and 3a exhibited no activity. In particular, compound 1 exhibited a concentration-dependent radical scavenging activity on DPPH with EC50 of 31.43 µg/mL.
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Affiliation(s)
- Raymond N Nono
- Laboratory of Environmental and Applied Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, Box 183, Dschang, Cameroon
| | - Elvine P Nguelefack-Mbuyo
- Laboratory of Animal Physiology and Phytopharmacology, Department of Animal Biology, Faculty of Science, University of Dschang, Box 67, Dschang, Cameroon
| | - Laurence K Nzowa
- Laboratory of Environmental and Applied Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, Box 183, Dschang, Cameroon
| | - Beaudelaire K Ponou
- Laboratory of Environmental and Applied Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, Box 183, Dschang, Cameroon
| | - Rémy B Teponno
- Laboratory of Environmental and Applied Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, Box 183, Dschang, Cameroon
| | - Télesphore B Nguelefack
- Laboratory of Animal Physiology and Phytopharmacology, Department of Animal Biology, Faculty of Science, University of Dschang, Box 67, Dschang, Cameroon
| | - Luciano Barboni
- School of Science and Technology, Chemistry Division, University of Camerino, Via S. Agostino 1, 62032, Camerino, Italy
| | - Léon A Tapondjou
- Laboratory of Environmental and Applied Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, Box 183, Dschang, Cameroon.
| | - Hee-Juhn Park
- Department of Pharmaceutical Engineering, Sandji University, Wonju, 220-702, Republic of Korea.
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