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Kowa TK, Jansen O, Ledoux A, Mamede L, Wabo HK, Tchinda AT, Genta-Jouve G, Frédérich M. Bioassay-guided isolation of vilasinin-type limonoids and phenyl alkene from the leaves of Trichilia gilgiana and their antiplasmodial activities. Nat Prod Res 2021; 36:5039-5047. [PMID: 33951995 DOI: 10.1080/14786419.2021.1920017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Bioassay-guided fractionation of the CH2Cl2-MeOH (1:1) leaves extract of Trichilia gilgiana, yielded two new vilasinin-type limonoids named gilgianin A (1) and gilgianin B (2), one new phenyl alkene derivative designated as gilgialkene A (3), along with six known compounds: rubescin H (4), TS3 (5), trichirubine A (6), sitosteryl-6'-O-undecanoate-β-D-glucoside (7), scopoletin (8), and octadecane-2-one (9). Their structures were elucidated based on spectroscopic analysis and comparison with literature data. Compounds 5 and 6 exhibited the highest antiplasmodial activity with IC50 values of 1.14 and 1.32 μM respectively. Moreover, compound 5 was very cytotoxic with CC50 value of 0.88 µM, compared to compound 6, which was not cytotoxic (CC50 > 10 µg/mL). Compounds 1 (IC50 = 9.84 µM), 2 (IC50 = 11.04 µM) and 4 (IC50 = 10.71 µM) presented good antiplasmodial activity while also exhibiting significant cytotoxicity, with CC50 values ranging from of 14.45 to 29.7 µM.
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Affiliation(s)
- Théodora K Kowa
- Laboratory of Phytochemistry, Centre for Research on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies (IMPM), Yaounde, Cameroon.,Faculty of Science, Department of Chemistry, University of Dschang, Dschang, Cameroon.,Laboratory of Pharmacognosy, Department of Pharmacy, CIRM, University of Liege, Liege, Belgium
| | - Olivia Jansen
- Laboratory of Pharmacognosy, Department of Pharmacy, CIRM, University of Liege, Liege, Belgium
| | - Allison Ledoux
- Laboratory of Pharmacognosy, Department of Pharmacy, CIRM, University of Liege, Liege, Belgium
| | - Lucia Mamede
- Laboratory of Pharmacognosy, Department of Pharmacy, CIRM, University of Liege, Liege, Belgium
| | - Hippolyte K Wabo
- Faculty of Science, Department of Chemistry, University of Dschang, Dschang, Cameroon
| | - Alembert T Tchinda
- Laboratory of Phytochemistry, Centre for Research on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies (IMPM), Yaounde, Cameroon.,Laboratory of Pharmacognosy, Department of Pharmacy, CIRM, University of Liege, Liege, Belgium
| | - Gregory Genta-Jouve
- Laboratoire C-TAC, UMR CNRS 8638, Faculté de Pharmacie, Université Paris Descartes, Paris, France
| | - Michel Frédérich
- Laboratory of Pharmacognosy, Department of Pharmacy, CIRM, University of Liege, Liege, Belgium
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Kowa TK, Tchokouaha LRY, Cieckiewicz E, Philips TJ, Dotse E, Wabo HK, Tchinda AT, Tane P, Frédérich M. Antileishmanial and cytotoxic activities of a new limonoid and a new phenyl alkene from the stem bark of Trichilia gilgiana (Meliaceae). Nat Prod Res 2019; 34:3182-3188. [DOI: 10.1080/14786419.2018.1553879] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Theodora K. Kowa
- Laboratory of Phytochemistry, Centre for Research on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies, Yaounde, Cameroon
- Laboratory of Pharmacognosy, Center for Interdisciplinary Research on Medicines (CIRM), University of Liege, Liege, Belgium
- Laboratory of Natural Products Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Lauve R. Y. Tchokouaha
- Laboratory of Pharmacology, Centre for Research on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies, Yaounde, Cameroon
- Department of Parasitology, Noguchi Memorial Institute for Medical Research (NMIMR), College of Health Sciences (CHS), University of Ghana, Legon, Accra, Ghana
| | - Ewa Cieckiewicz
- Laboratory of Pharmacognosy, Center for Interdisciplinary Research on Medicines (CIRM), University of Liege, Liege, Belgium
| | - Trudy Janice Philips
- Department of Clinical Pathology, NMIMR, CHS, University of Ghana, Legon, Accra, Ghana
| | - Eunice Dotse
- Department of Clinical Pathology, NMIMR, CHS, University of Ghana, Legon, Accra, Ghana
| | - Hippolyte K. Wabo
- Laboratory of Natural Products Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Alembert T. Tchinda
- Laboratory of Phytochemistry, Centre for Research on Medicinal Plants and Traditional Medicine, Institute of Medical Research and Medicinal Plants Studies, Yaounde, Cameroon
| | - Pierre Tane
- Laboratory of Natural Products Chemistry, Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Michel Frédérich
- Laboratory of Pharmacognosy, Center for Interdisciplinary Research on Medicines (CIRM), University of Liege, Liege, Belgium
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Kopa TK, Tane P, Wabo HK, Tala MF, Tchinda AT, Zofou D, Ning-Hua T. Activité antiplasmodiale in vitro des composés isolés des écorces du tronc de Vitex thyrsiflora. CR CHIM 2016. [DOI: 10.1016/j.crci.2015.10.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Nkuété AHL, Kuete V, Gozzini D, Migliolo L, Oliveira AL, Wabo HK, Tane P, Vidari G, Efferth T, Franco OL. Anti-leukemia activity of semi-synthetic phenolic derivatives from Polygonum limbatum Meisn. Chem Cent J 2015; 9:40. [PMID: 26155305 PMCID: PMC4493792 DOI: 10.1186/s13065-015-0115-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2014] [Accepted: 06/16/2015] [Indexed: 11/28/2022] Open
Abstract
Background The present report describes the semi-synthesis of a few O-prenylated phenolic derivatives and their in vitro antitumor activities. These compounds were prepared by modifying two naturally occurring antitumor phenols, 5,7-dihydroxy-3-(1′-hydroxy-1′-phenyl-methyl)-6-methoxy-chroman-4-one (A) and 2′,4′-dihydroxy-3′,6′-dimethoxychalcone (B), previously isolated from Polygonum limbatum Meisn. (Polygonaceae). The structures were elucidated by spectroscopic means and comparison with published data. The cytotoxicity of compounds was determined by using the resazurin assay in the parental drug-sensitive CCRF-CEM cell line and its multidrug-resistant P-glycoprotein-over-expressing subline, CEM/ADR5000. Results We describe in the present paper four new semi-synthetic derivatives of A and B: 5-hydroxy-6-methoxy-7-O-(3′-methylbut-2′-enyl)chroman-4-one (1), trivially named metapchromone, 5-acetoxy-6-methoxy-7-O-[3′-methylbut-2′enyl]chroman-4-one (2), trivially named sargisin, 2′-hydroxy-3′,6′-dimethoxy-4′-O-(3″-methylbut-2″-enyl)chalcone (3) trivially named limbachalcone A, and 2′-acetoxy-3′,6′-dimethoxy-4′-O-(3″-methylbut-2″-enyl)chalcone (4) trivially named tsedengchalcone. Their preliminary cytotoxic activities have been determined. We also report herein the isolation of 1-methylhydantoin (C) and betulinic acid (D) from Polygonum limbatum for the first time. Conclusions The study clearly suggests that semi-synthesis involving O-prenylation and acetylation of chalcones or other chromanones should be avoided in a search for anticancer drugs. This conclusion should be helpful when selecting substituents for the synthesis of potential anticancer drugs.
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Affiliation(s)
- Antoine Honoré Lonfouo Nkuété
- Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon ; Centro de Analises Proteômicas e Bioquimicas, Pós-Graduação em Ciencias Genomicas e Biotecnologia, Universidade Catolica de Brasilia, Brasilia, DF Brazil ; Dipartimento di Chimica, Laboratorio di Chimica delle Sostanze Organiche Naturali e Centro di Etnobiofarmacia (CISTRE), Università degli Studi di Pavia, Via Taramelli, 12-27100 Pavia, Italy
| | - Victor Kuete
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, University of Mainz, Staudinger Weg 5, 55128 Mainz, Germany ; Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Davide Gozzini
- Dipartimento di Chimica, Laboratorio di Chimica delle Sostanze Organiche Naturali e Centro di Etnobiofarmacia (CISTRE), Università degli Studi di Pavia, Via Taramelli, 12-27100 Pavia, Italy
| | - Ludovico Migliolo
- Centro de Analises Proteômicas e Bioquimicas, Pós-Graduação em Ciencias Genomicas e Biotecnologia, Universidade Catolica de Brasilia, Brasilia, DF Brazil ; S-Inova Biotech, Universidade Catolica Dom Bosco, Campo Grande, MS, Brazil
| | | | - Hippolyte K Wabo
- Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Pierre Tane
- Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Giovanni Vidari
- Dipartimento di Chimica, Laboratorio di Chimica delle Sostanze Organiche Naturali e Centro di Etnobiofarmacia (CISTRE), Università degli Studi di Pavia, Via Taramelli, 12-27100 Pavia, Italy
| | - Thomas Efferth
- Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Octávio Luiz Franco
- Centro de Analises Proteômicas e Bioquimicas, Pós-Graduação em Ciencias Genomicas e Biotecnologia, Universidade Catolica de Brasilia, Brasilia, DF Brazil ; S-Inova Biotech, Universidade Catolica Dom Bosco, Campo Grande, MS, Brazil
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Kuete V, Nkuete AHL, Mbaveng AT, Wiench B, Wabo HK, Tane P, Efferth T. Cytotoxicity and modes of action of 4'-hydroxy-2',6'-dimethoxychalcone and other flavonoids toward drug-sensitive and multidrug-resistant cancer cell lines. Phytomedicine 2014; 21:1651-1657. [PMID: 25442273 DOI: 10.1016/j.phymed.2014.08.001] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Revised: 07/17/2014] [Accepted: 08/16/2014] [Indexed: 06/04/2023]
Abstract
INTRODUCTION Resistance of cancer to chemotherapy is a main cause in treatment failure. Naturally occurring chalcones possess a wide range of biological activities including anti-cancer effects. In this work, we evaluated the antiproliferative activity of three chalcones [4'-hydroxy-2',6'-dimethoxychalcone (1), cardamomin (2), 2',4'-dihydroxy-3',6'-dimethoxychalcone (3)], and four flavanones [(S)-(-)-pinostrobin (4), (S)-(-)-onysilin (5) and alpinetin (6)] toward nine cancer cell lines amongst which were multidrug resistant (MDR) types. METHODS The resazurin reduction assay was used to detect the antiproliferative activity of the studied samples whilst flow cytometry for the mechanistic studies of the most active molecule (1). RESULTS IC50 values in a range of 2.54 μM against CEM/ADR5000 leukemia cells to 58.63 μM toward hepatocarcinoma HepG2 cells were obtained with 1. The lowest IC50 values of 8.59 μM for 2 and 10.67 μM for 3 were found against CCRF-CEM cells leukemia cells, whilst the corresponding values were above 80 μM for 4 and 6. P-glycoprotein-expressing and multidrug-resistant CEM/ADR5000 cells were much more sensitive toward compound 1 than toward doxorubicin and low cross-resistance or even collateral sensitivity was observed in other drug-resistent cell lines to this compound. Normal liver AML12 cells were more resistant to the studied compounds than HepG2 liver cancer cells, indicating tumor specificity at least to some extent. Compound 1 arrested the cell cycle between Go/G1 phase, strongly induced apoptosis via disrupted mitochondrial membrane potential (MMP) and increased production of reactive oxygen species (ROS) in the studied leukemia cell line. CONCLUSIONS Chalcone 1 was the best tested cytotoxic molecule and further studies will be performed in order to envisage its possible use in the fight against multifactorial resistant cancer cells.
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Affiliation(s)
- Victor Kuete
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, University of Mainz, Staudinger Weg 5, 55128 Mainz, Germany; Department of Biochemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Antoine H L Nkuete
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Armelle T Mbaveng
- Department of Biochemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Benjamin Wiench
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, University of Mainz, Staudinger Weg 5, 55128 Mainz, Germany
| | - Hippolyte K Wabo
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Pierre Tane
- Department of Chemistry, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Thomas Efferth
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, University of Mainz, Staudinger Weg 5, 55128 Mainz, Germany.
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Tala MF, Krohn K, Hussain H, Kouamc SF, Wabo HK, Tane P, Schulz B, Hu Q. Laurentixanthone C: A New Antifungal and Algicidal Xanthone from Stem Bark of Vismia laurentii. ACTA ACUST UNITED AC 2014. [DOI: 10.1515/znb-2007-0413] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Laurentixanthone C (1), a new xanthone, was isolated from the stem bark of Vismia laurentii (Guttiferae or Clusiaceae), in addition to the known compounds vismiaquinone (2), bisvismiaquinone (3), and dammaradienol (4). The structures were established based on spectroscopic studies, notably of the 2D NMR spectra. Preliminary results showed that 1 is algicidal and strongly antibacterial against the Gram-positive bacteria Bacillus megaterium and Chlorella fusca, respectively.
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Affiliation(s)
- Michel F. Tala
- Department of Chemistry, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Karsten Krohn
- Department of Chemistry, University of Paderborn, Warburger Straße 100, 33098 Paderborn, Germany
| | - Hidayat Hussain
- Department of Chemistry, University of Paderborn, Warburger Straße 100, 33098 Paderborn, Germany
| | - Simeon F. Kouamc
- Department of Chemistry, Higher Teachers’ Training College, University of Yaounde 1, BP47, Yaounde, Cameroon
| | - Hippolyte K. Wabo
- Department of Chemistry, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Pierre Tane
- Department of Chemistry, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Barbara Schulz
- Institute of Microbiology, Technical University of Braunschweig, D-38106 Braunschweig, Germany
| | - Qunxiu Hu
- Institute of Microbiology, Technical University of Braunschweig, D-38106 Braunschweig, Germany
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Tala MF, Talontsi FM, Wabo HK, Lantovololona JER, Tane P, Laatsch H. Anthraquinones and triterpenoids from seeds of Vismia guineensis. BIOCHEM SYST ECOL 2013. [DOI: 10.1016/j.bse.2013.04.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Kuete V, Tchakam PD, Wiench B, Ngameni B, Wabo HK, Tala MF, Moungang ML, Ngadjui BT, Murayama T, Efferth T. Cytotoxicity and modes of action of four naturally occuring benzophenones: 2,2',5,6'-tetrahydroxybenzophenone, guttiferone E, isogarcinol and isoxanthochymol. Phytomedicine 2013; 20:528-536. [PMID: 23507522 DOI: 10.1016/j.phymed.2013.02.003] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Accepted: 02/15/2013] [Indexed: 06/01/2023]
Abstract
INTRODUCTION The emergence of drug-resistant cancer cells drastically reduces the efficacy of many antineoplasic agents and, consequently, increases the frequency of therapeutic failure. Benzophenones are known to display many pharmacological properties including cytotoxic activities. The present study was aimed at investigating the cytotoxicity and the modes of action of four naturally occurring benzophenones 2,2',5,6'-tetrahydroxybenzophenone (1), isogarcinol (2), isoxanthochymol (3) and guttiferone E (4) on a panel of eleven cancer cell lines including various sensitive and drug-resistant phenotypes. METHODS The cytotoxicity of the compounds was determined using a resazurin reduction assay, whereas the caspase-Glo assay was used to detect the activation of caspases 3/7, caspase 8 and caspase 9 in cells treated with compounds 2-4. Flow cytometry was used for cell cycle analysis and detection of apoptotic cells, analysis of mitochondrial membrane potential (MMP) as well as measurement of reactive oxygen species (ROS). RESULTS The four tested benzophenones inhibited the proliferation of all tested cancer cell lines including sensitive and drug-resistant phenotypes. Collateral sensitivity of cancer cells to compounds 1-4 was generally better than to doxorubicin. Compound 2 showed the best activity with IC50 values below or around 1 μM against HCT116 colon carcinoma cells (p53+/+) (0.86 μM) and leukemia CCRF-CEM (1.38 μM) cell lines. Compounds 2-4 strongly induced apoptosis in CCRF-CEM cells via caspases 3/7, caspase 8 and caspase 9 activation and disruption of MMP. CONCLUSIONS The studied benzophenones are cytotoxic compounds that deserve more detailed exploration in the future, to develop novel anticancer drugs against sensitive and otherwise drug-resistant phenotypes.
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Affiliation(s)
- Victor Kuete
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, University of Mainz, Mainz, Germany
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Toyang NJ, Wabo HK, Ateh EN, Davis H, Tane P, Sondengam LB, Bryant J, Verpoorte R. Cytotoxic sesquiterpene lactones from the leaves of Vernonia guineensis Benth. (Asteraceae). J Ethnopharmacol 2013; 146:552-6. [PMID: 23376285 PMCID: PMC5600613 DOI: 10.1016/j.jep.2013.01.022] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Revised: 01/05/2013] [Accepted: 01/14/2013] [Indexed: 05/09/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Vernonia guineensis Benth. (Asteraceae) preparations are used in folk medicine in Cameroon to treat a number of ailments, including prostate cancer and malaria, and is used as an anthelmintic, adaptogen and antidote. The aim of this study was to continue the validation of the activity of Vernonia guineensis Benth. extracts and isolated molecules against cancer cell lines following the previous isolation of an anti-prostate cancer sugar ester from the root extract. MATERIALS AND METHODS Acetone extracts of Vernonia guineensis Benth. leaves were tested for activity against 10 cancer cell lines (Breast-MDA-MB-231, Breast-MCF-7, Colon-HCT-116, Leukemia-HL-60, Lung-A549, Melanoma-A375, Ovarian-OVCAR3, Pancreas-Mia-paca, Prostate-PC-3 and Prostate-DU-145). The acetone extract was subjected to bioactivity guided fractionation. Anti-proliferation and clonogenic activity of the isolated compounds were tested. The WST-1 assay was used for the anti-proliferation activity, while the standard clonogenic test was used to determine the clonogenic activity. RESULTS The acetone extract of Vernonia guineensis Benth. demonstrated in vitro activity ranging from IC50 4-26μg/mL against the 10 cell lines. Activity guided fractionation of this extract yielded two sesquiterpene lactones, isolated for the first time from the genus Vernonia. The compounds were characterized using spectroscopic experiments, including a combination of 1D and 2D NMR data. Vernopicrin (1) and Vernomelitensin (2) demonstrated in vitro activity against human cancer cell lines with IC50 ranging from 0.35-2.04μM (P<0.05) and 0.13-1.5μM (P<0.05), respectively, between the most and least sensitive cell lines for each compound. Vernopicrin was most active against the human melanoma (A375) cell line and least active against the lung cancer (A549) cell line, while Vernomelitensin was also most active against the human melanoma (A375) cell line and least active against the breast cancer (MCF-7) cell line. Both compounds also demonstrated anticlonogenic activity. CONCLUSION The cytotoxicity demonstrated by the crude extract and isolated sesquiterpenes against cancer cell lines highlights the medicinal potential of V. guineensis. The selective anti-proliferation and dose dependent anticlonogenic activities suggest that the identified sesquiterpenes could be potential antitumor agents.
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Affiliation(s)
- Ngeh J Toyang
- Virgin Botanicals and Biotech Incorporated, Columbia, MD, USA; Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD, USA.
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Tchakam PD, Lunga PK, Kowa TK, Lonfouo AHN, Wabo HK, Tapondjou LA, Tane P, Kuiate JR. Antimicrobial and antioxidant activities of the extracts and compounds from the leaves of Psorospermum aurantiacum Engl. and Hypericum lanceolatum Lam. Altern Ther Health Med 2012; 12:136. [PMID: 22916964 PMCID: PMC3576290 DOI: 10.1186/1472-6882-12-136] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2012] [Accepted: 08/14/2012] [Indexed: 11/13/2022]
Abstract
Background Psorospermun aurantiacum and Hypericum lanceolatum are plants locally used in Cameroon and other parts of Africa for the treatment of gastrointestinal and urinary tract infections, skin infections, venereal diseases, gastrointestinal disorder, infertility, epilepsy as well as microbial infections. The present study was designed in order to investigate the in vitro antimicrobial and radical scavenging activities of the extracts and isolated compounds from the leaves of these plants. Methods The plant extract was prepared by maceration in ethyl acetate and methanol and fractionated by column chromatography. The structures of isolated compounds were elucidated by spectroscopic analyses in conjunction with literature data. The broth microdilution method was used to evaluate the in vitro antimicrobial activity against bacteria, yeasts and dermatophytes. The antioxidant potentials of the extracts and their isolated compounds were evaluated using the DPPH radical scavenging method. Results Five known compounds: physcion (1), 1,8-dihydroxy-3-geranyloxy-6-methylanthraquinone (2), kenganthranol B (3), vismiaquinone (4), and octacosanol (5) were isolated from the leaves of P. aurantiacum while six compounds including friedelin (6), betulinic acid (7), 2,2’,5,6’-tetrahydroxybenzophenone (8), allanxanthone A (9), 1,3,6- trihydroxyxanthone (10) and isogarcinol (11) were isolated from H. lanceolatum. Compound 8 and 4 exhibited the highest antibacterial and antifungal activities with MIC ranges of 2–8 μg/ml and 4–32 μg/ml respectively. P. aurantiacum crude extract (Rsa50 = 6.359 ± 0.101) showed greater radical scavenging activity compared with H. lanceolatum extract (Rsa50 = 30.996 ± 0.879). Compound 11 showed the highest radical scavenging activity (RSa50 = 1.012 ± 0.247) among the isolated compounds, comparable to that of L-arscobic acid (RSa50 = 0.0809 ± 0.045). Conclusions The experimental findings show that the ethyl acetate and methanol extracts and isolated compounds from P. aurantiacum and H. lanceolatum stem bark possess significant antimicrobial and antioxidant activities justifying the use of these plants in traditional medicine, which may be developed as phytomedicines.
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Toyang NJ, Wabo HK, Ateh EN, Davis H, Tane P, Kimbu SF, Sondengam LB, Bryant J. In vitro anti-prostate cancer and ex vivo antiangiogenic activity of Vernonia guineensis Benth. (Asteraceae) tuber extracts. J Ethnopharmacol 2012; 141:866-71. [PMID: 22465590 DOI: 10.1016/j.jep.2012.03.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2011] [Revised: 02/18/2012] [Accepted: 03/16/2012] [Indexed: 05/08/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Prostate cancer is a major problem worldwide and affects most men above the age of forty-five. Vernonia guineensis Benth. (Asteraceae) root decoction is used in folk medicine in Cameroon to treat a number of ailments including prostate cancer. The aim of this study was to provide a preliminary validation of the use of Vernonia guineensis Benth. extracts to treat prostate cancer by evaluating the in vitro activity of its crude extracts and isolated molecules on prostate cancer cells lines and effect on angiogenesis which is essential for growth and metastases of prostate cancer. MATERIALS AND METHODS Aqueous, dichloromethane and methanol extracts of Vernonia guineensis Benth. tubers were tested for activity against three prostate cancer cell lines (PC-3, DU-145 and AT3B-1). The dichloromethane extract was subjected to bioactivity guided fractionation. Anti-proliferation, clonogenic and antiangiogenic activity of the crude extracts and isolated compound were tested. The WST-1 assay was used for the anti-proliferation activity meanwhile the standard clonogenic test and the rat ring aorta assay were carried out to determine the clonogenic and antiangiogenic activity of tested products respectively. RESULTS The aqueous and methanol extracts of Vernonia guineensis Benth. demonstrated weak activity against prostate cancer cell lines in vitro with IC(50)>100 μg/mL. The dichloromethane extract was more potent with IC(50) of 56.233±3.630 μg/ml and 67.316±2.452 μg/ml against the DU-145 and PC-3 cell lines respectively. Activity guided fractionation of this extract yielded a Pentaisovalerylsucrose (1) isolated for the first time from a natural source to the best of our knowledge. Compound 1 demonstrated in vitro activity against the human prostate cancer cell lines PC-3 and DU-145 with IC(50) of 5.701±0.142 μM and 4.275±0.710 μM, respectively. The IC(50) of the compound was 5.763±0.425 μM against AT3B-1, a rat prostate cancer cell line expressing P-glycoprotein which is linked to drug resistance in most metastatic cancers. Compared to compound 1, Paclitaxel and Docetaxel were active against AT3B-1 at 2.641±1.253 μM and 0.613±0.251 μM. Paclitaxel showed IC(50) values of 0.004±0.002 μM and 0.003±0.001 μM against DU-145 and PC-3 prostate cancer cell lines respectively. Docetaxel showed IC(50) values of 0.002±0.001 μM and 0.004±0.001 μM against DU-145 and PC-3 prostate cancer cell lines respectively. CONCLUSION The in vitro anti-prostate cancer and the antiangiogenic activity of Vernonia guineensis Benth. extracts and isolated compound support the use of the tubers of this plant for the treatment of prostate cancer.
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Dzoyem JP, Nkuete AHL, Kuete V, Tala MF, Wabo HK, Guru SK, Rajput VS, Sharma A, Tane P, Khan IA, Saxena AK, Laatsch H, Tan NH. Cytotoxicity and antimicrobial activity of the methanol extract and compounds from Polygonum limbatum. Planta Med 2012; 78:787-792. [PMID: 22495442 DOI: 10.1055/s-0031-1298431] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The present study was designed to investigate the antimicrobial activity and the cytotoxicity of the methanol extract (PLA) as well as fractions (PLA1-4) and compounds [cardamomin (1), (±)-polygohomoisoflavanone (2), (S)-(-)-pinostrobin (3), 2',4'-dihydroxy-3',6'-dimethoxychalcone (4), (2S)-(-)-5-hydroxy-6,7-dimethoxyflavanone (5), and (2S)-(-)-5,7-dimethoxyflavanone (6)] obtained from leaves of Polygonum limbatum. The microbroth dilution was used to determine the minimal inhibitory concentration (MIC) of the samples against 11 microbial strains including Candida albicans, C. krusei, C. tropicalis, Aspergillus fumigatus, Pseudomonas aeruginosa, Escherichia coli, vancomycin-resistant Enterococcus faecalis (VRE), Staphylococcus aureus, methicillin-resistant S. aureus (MRSA), S.epidermidis, and Mycobacterium tuberculosis H37Rv. The sulphorhodamine B cell growth inhibition assay was used to assess the cytotoxicity of the above samples on lung A549 adenocarcinoma, breast carcinoma MCF-7, prostate carcinoma PC-3, cervical carcinoma HeLa, and the acute monocytic leukemia cell line THP-1. The results of the MIC determination indicated that, apart from fraction PLA3, all other fractions as well as PLA and compound 3 were selectively active. MIC values were noted on 100 % of the 11 tested microorganisms for fraction PLA3, 72.7 % for PLA, fraction PLA2, and compound 4, 63.6 % for PLA1, and 54.5 % for fraction PLA4. The results of the cytotoxicity assay revealed that, except for A459 cells, more than 50 % inhibition of the proliferation was obtained with each of the tested samples on at least one of the four other cell lines. IC₅₀ values below 4 µg/mL were obtained with 1 and 4 on THP-1 cells. The overall results of the present study provided baseline information for the possible use of Polygonum limbatum as well as some of the isolated compounds for the control of cancer diseases and mostly leukemia.
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Affiliation(s)
- Jean P Dzoyem
- Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
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Mpetga JDS, Shen Y, Tane P, Li SF, He HP, Wabo HK, Tene M, Leng Y, Hao XJ. Cycloartane and friedelane triterpenoids from the leaves of Caloncoba glauca and their evaluation for inhibition of 11β-hydroxysteroid dehydrogenases. J Nat Prod 2012; 75:599-604. [PMID: 22360639 DOI: 10.1021/np200831c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Five new triterpenoids, caloncobic acids A and B (1 and 2), caloncobalactones A and B (3 and 4), and glaucalactone (5), along with the known compounds 3β,21β-dihydroxy-30-nor-(D:A)-friedo-olean-20(29)-en-27-oic acid (6) and acetyltrichadenic acid B (7), were isolated from the leaves of Caloncoba glauca. The structures of 1-5 were elucidated using spectroscopic methods. Compounds 1-7 were evaluated for their inhibitory activities against two isozymes of 11β-hydroxysteroid dehydrogenase (11β-HSD1 and 11β-HSD2). Compounds 1 and 2 exhibited strong inhibitory activities against mouse (EC(50) 132 and 13 nM) and human (EC(50) 105 and 72 nM) 11β-HSD1.
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Affiliation(s)
- James D Simo Mpetga
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People's Republic of China
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Kuete V, Wabo HK, Eyong KO, Feussi MT, Wiench B, Krusche B, Tane P, Folefoc GN, Efferth T. Anticancer activities of six selected natural compounds of some Cameroonian medicinal plants. PLoS One 2011; 6:e21762. [PMID: 21886765 PMCID: PMC3158745 DOI: 10.1371/journal.pone.0021762] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2011] [Accepted: 06/06/2011] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Natural products are well recognized as sources of drugs in several human ailments. In the present work, we carried out a preliminary screening of six natural compounds, xanthone V(1) (1); 2-acetylfuro-1,4-naphthoquinone (2); physcion (3); bisvismiaquinone (4); vismiaquinone (5); 1,8-dihydroxy-3-geranyloxy-6-methylanthraquinone (6) against MiaPaCa-2 pancreatic and CCRF-CEM leukemia cells and their multidrug-resistant subline, CEM/ADR5000. Compounds 1 and 2 were then tested in several other cancer cells and their possible mode of action were investigated. METHODOLOGY/FINDINGS The tested compounds were previously isolated from the Cameroonian medicinal plants Vismia laurentii (1, 3, 4, 5 and 6) and Newbouldia laevis (2). The preliminary cytotoxicity results allowed the selection of xanthone V(1) and 2-acetylfuro-1,4-naphthoquinone, which were then tested on a panel of cancer cell lines. The study was also extended to the analysis of cell cycle distribution, apoptosis induction, caspase 3/7 activation and the anti-angiogenic properties of xanthone V(1) and 2-acetylfuro-1,4-naphthoquinone. IC(50) values around or below 4 µg/ml were obtained on 64.29% and 78.57% of the tested cancer cell lines for xanthone V(1) and 2-acetylfuro-1,4-naphthoquinone, respectively. The most sensitive cell lines (IC(50)<1 µg/ml) were breast MCF-7 (to xanthone V(1)), cervix HeLa and Caski (to xanthone V(1) and 2-acetylfuro-1,4-naphthoquinone), leukemia PF-382 and melanoma colo-38 (to 2-acetylfuro-1,4-naphthoquinone). The two compounds showed respectively, 65.8% and 59.6% inhibition of the growth of blood capillaries on the chorioallantoic membrane of quail eggs in the anti-angiogenic assay. Upon treatment with two fold IC(50) and after 72 h, the two compounds induced cell cycle arrest in S-phase, and also significant apoptosis in CCRF-CEM leukemia cells. Caspase 3/7 was activated by xanthone V(1). CONCLUSIONS/SIGNIFICANCE The overall results of the present study provided evidence for the cytotoxicity of compounds xanthone V(1) and 2-acetylfuro-1,4-naphthoquinone, and bring supportive data for future investigations that will lead to their use in cancer therapy.
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Affiliation(s)
- Victor Kuete
- Department of Biochemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, University of Mainz, Mainz, Germany
| | - Hippolyte K. Wabo
- Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Kenneth O. Eyong
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
| | - Michel T. Feussi
- Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Benjamin Wiench
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, University of Mainz, Mainz, Germany
| | - Benjamin Krusche
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, University of Mainz, Mainz, Germany
| | - Pierre Tane
- Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
| | - Gabriel N. Folefoc
- Department of Organic Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
| | - Thomas Efferth
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, University of Mainz, Mainz, Germany
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Teke GN, Lunga PK, Wabo HK, Kuiate JR, Vilarem G, Giacinti G, Kikuchi H, Oshima Y. Antimicrobial and antioxidant properties of methanol extract, fractions and compounds from the stem bark of Entada abyssinica Stend ex A. Satabie. Altern Ther Health Med 2011; 11:57. [PMID: 21771305 PMCID: PMC3157447 DOI: 10.1186/1472-6882-11-57] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2011] [Accepted: 07/19/2011] [Indexed: 11/29/2022]
Abstract
Background The aim of this study was to evaluate the antimicrobial and antioxidant activities of the methanol extract, fractions and isolated compounds from Entada abyssinica stem bark, plant used traditionally against gastrointestinal infections. Methods The methanol extract of E. abyssinica stem bark was pre-dissolved in a mixture of methanol and water, and then partitioned between n-hexane, ethyl acetate and n-butanol. The ethyl acetate portion was fractionated by column chromatography and the structures of isolated compounds elucidated by analysis of spectroscopic data and comparison with literature data. Antimicrobial activity was assayed by broth microdilution techniques on bacteria and yeasts. The antioxidant activity was determined by DPPH radical scavenging method. Results Four known compounds [(5S,6R,8aR)-5-(carboxymethyl)-3,4,4a,5,6,7,8,8a-octahydro-5,6,8a-trimethylnaphthalenecarboxylic acid (1), methyl 3,4,5-trihydroxybenzoate (2), benzene-1,2,3-triol (3) and 2,3-dihydroxypropyltriacontanoate (4)] were isolated. Compared to the methanol extract, fractionation increased the antibacterial activities of the n-hexane and ethyl acetate fractions, while the antifungal activities increased in ethyl acetate, n-butanol and aqueous residue fractions. The isolated compounds were generally more active on bacteria (9.7 to 156.2 μg/ml) than yeasts (78.1 to 312.5 μg/ml). Apart from compound 1, the three others displayed DPPH· scavenging activity (RSa), with RSa50 values of 1.45 and 1.60 μg/ml. Conclusion The results obtained from this study support the ethnomedicinal use of E. abyssinica in the treatment of gastrointestinal infections and the isolated compounds could be useful in the standardisation of antimicrobial phytomedicine from this plant.
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Zofou D, Kowa TK, Wabo HK, Ngemenya MN, Tane P, Titanji VPK. Hypericum lanceolatum (Hypericaceae) as a potential source of new anti-malarial agents: a bioassay-guided fractionation of the stem bark. Malar J 2011; 10:167. [PMID: 21682873 PMCID: PMC3131257 DOI: 10.1186/1475-2875-10-167] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2011] [Accepted: 06/17/2011] [Indexed: 12/13/2022] Open
Abstract
Background Malaria is a major public health threat in Africa, and traditional medicine continues to play a key role in its control especially in rural areas. A bioassay-guided fractionation was carried out in order to evaluate the anti-malarial potential and the safety of the methanol extract of the Hypericum lanceolatum stem bark. Methods The anti-plasmodial activity was assayed by the lactate dehydrogenase method (pLDH) against the multidrug-resistant W2mef laboratory strain, and a field isolate (SHF4) of Plasmodium falciparum. Cytotoxicity tests were carried out using the LLC-MK2 monkey kidney epithelial cells. Results Five compounds were isolated from the most active and least cytotoxic ethylacetate sub-extract: betulinic acid (HLT1), 2,2',5,6'-tetrahydroxybenzophenone (HLT2), 5-hydroxy-3-methoxyxanthone (HLT3), 3-hydroxy-5-methoxyxanthone (HLT4) and HLT0 (yet to be identified). Three of the tested compounds presented significant anti-plasmodial activities (with 50% inhibitory concentration, IC50 < 5 μM), with 5-hydroxy-3-methoxyxanthone exerting the highest activity, followed by HLT0 and betulinic acid. All the compounds with significant anti-plasmodial activity were non-cytotoxic, except betulinic acid which showed a 50% cytotoxic concentration, CC50 of 25 μg/mL. Conclusions These findings justify the use of H. lanceolatum stem bark as anti-malarial by traditional healers of Western Cameroon, and could constitute a good basis for further studies towards development of new drug candidates or phytomedicines for malaria.
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Affiliation(s)
- Denis Zofou
- Biotechnology Unit, University of Buea, P.O. Box 63 Buea, South West Region, Cameroon
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Sob SVT, Wabo HK, Tchinda AT, Tane P, Ngadjui BT, Ye Y. Anthraquinones, sterols, triterpenoids and xanthones from Cassia obtusifolia. BIOCHEM SYST ECOL 2010. [DOI: 10.1016/j.bse.2010.02.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Tamokou JDD, Tala MF, Wabo HK, Kuiate JR, Tane P. Antimicrobial activities of methanol extract and compounds from stem bark of Vismia rubescens. J Ethnopharmacol 2009; 124:571-575. [PMID: 19464353 DOI: 10.1016/j.jep.2009.04.062] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2009] [Revised: 04/28/2009] [Accepted: 04/29/2009] [Indexed: 05/27/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The plant, Vismia rubescens (Guttiferae) is popularly used in Cameroon and in several parts of Africa as febrifugal and for the treatment of various microbial infections (skin diseases, diarrhoea and venereal diseases). AIM OF THE STUDY This study was mapped out to evaluate the antimicrobial activities of the methanol extract and compounds from the stem bark of Vismia rubescens. MATERIALS AND METHODS Structures of the compounds obtained after column chromatography of the methanol-soluble fraction were determined by spectroscopy and in comparison with published data. The broth micro-dilution method was used to evaluate the antimicrobial activities against three bacteria species (Salmonella typhi, Staphylococcus aureus and Pseudomonas aeruginosa) and four yeast species (Candida albicans, Candida tropicalis, Candida parapsilosis and Cryptococcus neoformans). RESULTS Chemical analysis of the methanol extract from the stem bark of Vismia rubescens yielded five known compounds 1,4,8-trihydroxyxanthone (1), 1,7-dihydroxyxanthone (2), physcion (3), friedelin (4) and friedelanol (5). The crude extract and compounds 1, 2 and 3 exhibited both antibacterial and antifungal activities that varied between the microbial species (MIC=3.12-1000 microg/ml). Compounds 2 and 3 were the most active (MIC=3.12-100 microg/ml) while Staphylococcus aureus and Pseudomonas aeruginosa were sensitive to all the tested compounds. The antimicrobial activity of this plant as well as that of compounds 1 and 2 is being reported here for the first time. CONCLUSION These results provide promising baseline information for the potential use of this plant as well as some of the isolated compounds in the treatment of skin diseases and diarrhoea.
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Affiliation(s)
- Jean De Dieu Tamokou
- Department of Biochemistry, Faculty of Science, University of Dschang, P.O. Box 67 Dschang, Cameroon
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Sob SVT, Wabo HK, Tane P, Ngadjui BT, Ma D. A xanthone and a polyketide derivative from the leaves of Cassia obtusifolia (Leguminosae). Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.05.125] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Abstract
A new compound containing a unique terpenoid-quinone skeleton, pycnanthuquinone C (1) along with the known sargachromenol (2), prunetin (3), biochanin A (4), calopiptin (5), (12 S,13 S)-12,13-dihydroxylabda-8(17),14-dien-18-oic acid (6), (12 R,13 S)-12,13-dihydroxylabda-8(17),14-dien-18-oic acid (7), and sitosterol 3- O-beta- D-glucopyranoside (8), were isolated from the stem bark of Pycnanthus angolensis. Their structures were elucidated by spectroscopic means and comparison with published data. The antifungal activity of compounds 1, 2 and 3 was evaluated. Compound 1 was active against Trichophyton soudanense. Compound 2 was active against Trichophyton mentagrophytes while compound 3 was active against Microsporum audouinii and Trichophyton mentagrophytes.
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Affiliation(s)
- Hippolyte K Wabo
- Department of Chemistry, University of Dschang, Dschang, Cameroon
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Akam TM, Tane P, Wabo HK, Yong JN, Fanso-Free SNY, Connolly JD, Evans C, Farrugia LJ. A Pregnane Derivative and an Anti-plasmodial Labdane Diterpenoid from the Stem Bark of Turraenthus Africanus. Nat Prod Commun 2006. [DOI: 10.1177/1934578x0600100603] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Chemical investigation of the stem bark of Turraeanthus africanus (Meliaceae) afforded a new pregnane derivative, 17α,20S-dihydroxypregn-4-ene-3,16-dione, named turraeasterodione, together with three known diterpenoids, methyl 14,15-epoxylabda-8(17),12E-dien-16-oate, 16-oxolabda-8(17),12E-dien-15-oic acid, and 16-acetoxy-12R,15-epoxylabda-8(17),13(16)-dien-15β-ol. Their structures were elucidated by spectroscopic and spectrometric methods. Methyl 14,15-epoxylabda-8(17),12E-dien-16-oate was found to exhibit anti-plasmodial activity against a chloroquine-resistant strain of Plasmodium falciparum.
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Affiliation(s)
- Thomas M. Akam
- Department of Chemistry, University of Buea, P.O. Box 63, Buea, Cameroon
| | - Pierre Tane
- Department of Chemistry, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Hippolyte K. Wabo
- Department of Chemistry, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Joseph N. Yong
- Department of Chemistry, University of Buea, P.O. Box 63, Buea, Cameroon
| | | | | | - Cameron Evans
- Chemistry Department, University of Glasgow, G12 8QQ, Scotland, UK
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Abstract
A new benzophenanthridine alkaloid, 6-[2'-ethoxy-2'-(2'',4'',5''-trimethoxyphenyl)] ethyl-7,8-dimethoxy-5-methyl-2,3-methylenedioxy-5,6-dihydrobenzo[c]phenanthridine named buesgeniine (1), as well as the known decarine, were isolated from the extract of the stem bark of Zanthoxylum buesgenii. In addition, three known lignans, sesamine, matairesinol dimethylether, and methylpluviatilol, were also identified. The structure of 1 was elucidated using spectroscopic methods.
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Affiliation(s)
- Pierre Tane
- Department of Chemistry, University of Dschang, Faculty of Science, P. O. Box 67, Dschang, Cameroon.
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Wabo HK, Tane P, Connolly JD, Okunji CC, Schuster BM, Iwu MM. Tabouensinium chloride, a novel quaternary pyranoquinoline alkaloid from Araliopsis tabouensis. Nat Prod Res 2005; 19:591-5. [PMID: 16010825 DOI: 10.1080/14786410412331280078] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
A novel pyranoquinoline alkaloid 3,4-dihydro-3-hydroxy-5-methoxy-2,2,10-trimethylpyrano [2,3-b]quinoline named tabouensinium chloride (1), was isolated from the stem bark of Araliopsis tabouensis along with twelve known quinoline alkaloids. In addition, the known flindisol, lupeol and beta-sitosterol glucoside were also identified. Their structures were deduced from spectral data.
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Affiliation(s)
- Hippolyte K Wabo
- Department of Chemistry, Faculty of Science, University of Dschang, Box 67, Dschang, Cameroon
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Abstract
Investigations of the stem and root bark of Myrica arborea (Myricaceae) have yielded two novel diarylheptanoids, myricarborin and 11-O-beta-D-xylopyranosylmyricanol along with the known myricanol and 5-O-beta-D-glucopyranosylmyricanol. The structures of the novel compounds were determined by spectroscopic methods.
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Affiliation(s)
- M Tene
- Department of Chemistry, University of Dschang, Cameroon
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