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Lautié E, Rasse C, Rozet E, Mourgues C, Vanhelleputte JP, Quetin-Leclercq J. Fast microwave-assisted extraction of rotenone for its quantification in seeds of yam bean (Pachyrhizussp.). J Sep Sci 2013; 36:758-63. [DOI: 10.1002/jssc.201200347] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Revised: 10/10/2012] [Accepted: 11/04/2012] [Indexed: 11/06/2022]
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Lai TNH, Herent MF, Quetin-Leclercq J, Nguyen TBT, Rogez H, Larondelle Y, André CM. Piceatannol, a potent bioactive stilbene, as major phenolic component in Rhodomyrtus tomentosa. Food Chem 2012; 138:1421-30. [PMID: 23411263 DOI: 10.1016/j.foodchem.2012.10.125] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2012] [Revised: 09/28/2012] [Accepted: 10/24/2012] [Indexed: 12/25/2022]
Abstract
The sim fruit (Rhodomyrtus tomentosa) has long been used in folk medicine to treat diarrhoea, dysentery, and to boost the immune system. The purpose of this work was to determine its phenolic profile and to evaluate the changes of content during maturation, as well as the variations induced by environmental conditions. Using HPLC-ESI-HR-MS, 19 phenolic compounds (PCs) were tentatively characterised and included stilbenes and ellagitannins as major components, followed by anthocyanins, flavonols, and gallic acid. PCs were then further quantified by HPLC-DAD. Piceatannol, a promising health-promoting stilbene component, was the major PC in the fruit with a concentration of 2.3mg/g dry weight at full maturity stage. This concentration is 1000-2000 times higher than that of red grapes, a major source of stilbene in the human diet. During maturation, the contents in piceatannol and other stilbenes, ellagitannins, and flavonols decreased while the anthocyanin content increased. Shade-grown sim fruits showed significantly higher piceatannol levels than sun-exposed fruits. Taken together, these findings highlight the potential of sim, an under-utilised plant species from South-East Asia, as a source of health-promoting fruits.
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Rivière C, Thi Hong VN, Hoai NN, Dejaegher B, Tistaert C, Van KP, Heyden YV, Chau Van M, Quetin-Leclercq J. N-methyl-5-carboxamide-2-pyridone from Mallotus barbatus: A chemosystematic marker of the Euphorbiaceae genus Mallotus. BIOCHEM SYST ECOL 2012. [DOI: 10.1016/j.bse.2012.05.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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79
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Dias ALS, Rozet E, Chataigné G, Oliveira AC, Rabelo CAS, Hubert P, Rogez H, Quetin-Leclercq J. A rapid validated UHPLC-PDA method for anthocyanins quantification from Euterpe oleracea fruits. J Chromatogr B Analyt Technol Biomed Life Sci 2012; 907:108-16. [PMID: 23026226 DOI: 10.1016/j.jchromb.2012.09.015] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2012] [Revised: 08/31/2012] [Accepted: 09/09/2012] [Indexed: 11/26/2022]
Abstract
The aim of this work is to develop the first validated UHPLC-PDA method for major anthocyanins quantification in Euterpe oleracea fruits after fast extraction procedures and samples preparation. The separation was performed on HSS C18 column (1.8 μm) using a gradient elution with acetonitrile and 5% formic acid in a total run time of only 17 min. Total error and accuracy profiles were used as criteria for the validation process. Calibration in the matrix was found to be more accurate than calibration without matrix. Trueness (<6.76% relative bias), repeatability (<4.6% RSD), intermediate precision (<5.3% RSD), selectivity, response function and linearity for major anthocyanins, cyanidin-3-glucoside and cyanidin-3-rutinoside, were evaluated. The concentration range validated was 1-48 μg/mL for both compounds. In addition two cyanidin-di-O-glycosides were detected for the fist time in this fruit. We also showed that a first extraction of the fruits with ethyl acetate removes the lipophilic compounds and allows an easier extraction by methanol and quantification of anthocyanins in this extract.
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Fatondji HR, Kpoviessi S, Gbaguidi F, Bero J, Hannaert V, Quetin-Leclercq J, Poupaert J, Moudachirou M, Accrombessi GC. Structure–activity relationship study of thiosemicarbazones on an African trypanosome: Trypanosoma brucei brucei. Med Chem Res 2012. [DOI: 10.1007/s00044-012-0208-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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81
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Rakotoniriana EF, Scauflaire J, Rabemanantsoa C, Urveg-Ratsimamanga S, Corbisier AM, Quetin-Leclercq J, Declerck S, Munaut F. Colletotrichum gigasporum sp. nov., a new species of Colletotrichum producing long straight conidia. Mycol Prog 2012. [DOI: 10.1007/s11557-012-0847-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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82
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Ganfon H, Bero J, Tchinda AT, Gbaguidi F, Gbenou J, Moudachirou M, Frédérich M, Quetin-Leclercq J. Antiparasitic activities of two sesquiterpenic lactones isolated from Acanthospermum hispidum D.C. JOURNAL OF ETHNOPHARMACOLOGY 2012; 141:411-417. [PMID: 22440261 DOI: 10.1016/j.jep.2012.03.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2011] [Revised: 02/17/2012] [Accepted: 03/05/2012] [Indexed: 05/31/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Aerial parts of Acanthospermum hispidum D.C. are often used by traditional healers in Benin for various diseases and especially for malaria. AIM OF THE STUDY To identify active compounds from extracts of Acanthospermum hispidum D.CV. leaves previously shown to possess antimalarial properties and analyse in vivo activity and toxicity of crude extracts. MATERIALS AND METHODS Compounds were isolated from aerial part of Acanthospermum hispidum D.C. and structurally elucidated using extensive spectroscopic analysis. Antiplasmodial activity was evaluated in vitro against a chloroquine-sensitive strain of Plasmodium falciparum (3D7) using the measurement of the plasmodial lactate dehydrogenase activity and in vivo against Plasmodium berghei berghei by the 4-day suppressive test. Selectivity of extract and purified compounds on Plasmodium parasites were evaluated by using MTT test on J774 macrophage like murine cells and WI38 human normal fibroblasts and also against two other parasites: Trypanosoma brucei brucei and Leishmania mexicana mexicana. Acute and sub-acute toxicities of a crude extract were evaluated on mice. RESULTS Two known sesquiterpenic lactones were isolated: 1 (15-acetoxy-8β-[(2-methylbutyryloxy)]-14-oxo-4,5-cis-acanthospermolide) and 2 (9α-acetoxy-15-hydroxy-8β-(2-methylbutyryloxy)-14-oxo-4,5-trans-acanthospermolide). 1 and 2 showed in vitro antiplasmodial activity against the chloroquine-sensitive strain (3D7) with IC(50) of 2.9±0.5 and 2.23±0.09μM respectively. Only 2 showed a high selectivity index (SI: 18.4) on Plasmodium compared to cytotoxicity against human fibroblasts cell line (WI38). 1 and 2 also showed interesting antiparasitic activities in vitro against Trypanosoma brucei brucei (IC(50) of 2.45±0.49 and 6.36±1.42μM respectively) and Leishmania mexicana mexicana (IC(50) of 0.94±0.05 and 2.54±0.19μM respectively). Furthermore, crude acidic water extract and fractions containing one of the two isolated compounds displayed a weak in vivo antimalarial activity against Plasmodium berghei berghei with a long half-life causing a delayed effect. In vivo acute (2000mg/kg) and sub-acute (1000mg/kg) toxicity tests on the crude acidic water extract did not show toxicity. CONCLUSION Crude acidic water extract, fractions and pure isolated compounds from Acanthospermum hispidum showed promising in vitro antiplasmodial activity. Despite our study did not show in vivo acute and subacute toxicities of the crude acidic water extract, its weak in vivo antimalarial activity and the in vitro cytotoxicity of pure compounds and enriched extracts containing 1 and 2 indicate that the aerial parts of Acanthospermum hispidum should be used with caution for malaria treatments.
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Rakotoniriana EF, Chataigné G, Raoelison G, Rabemanantsoa C, Munaut F, El Jaziri M, Urveg-Ratsimamanga S, Marchand-Brynaert J, Corbisier AM, Declerck S, Quetin-Leclercq J. Characterization of an endophytic whorl-forming Streptomyces from Catharanthus roseus stems producing polyene macrolide antibiotic. Can J Microbiol 2012; 58:617-27. [DOI: 10.1139/w2012-034] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
An endophytic whorl-forming Streptomyces sp. designated as TS3RO having antifungal activity against a large number of fungal pathogens, including Sclerotinia sclerotiorum , Rhizoctonia solani , Colletotrichum gloeosporioides , Cryphonectria parasitica , Fusarium oxysporum , Pyrenophora tritici-repentis , Epidermophyton floccosum , and Trichophyton rubrum , was isolated from surface-sterilized Catharanthus roseus stems. Preliminary identification showed that Streptomyces cinnamoneus subsp. sparsus was its closest related species. However, strain TS3RO could readily be distinguished from this species using a combination of phenotypic properties, 16S rDNA sequence similarity, and phylogenetic analyses. Thus, the whorl-forming Streptomyces sp. strain TS3RO is likely a new subspecies within the Streptomyces cinnamoneus group. Direct bioautography on a thin-layer chromatography plate with Cladosporium cucumerinum was conducted throughout the purification steps for bioassay-guided isolation of the active antifungal compounds from the crude extract. Structural elucidation of the isolated bioactive compound was obtained via LC–MS spectrometry, UV-visible spectra, and nuclear magnetic resonance data. It revealed that fungichromin, a known methylpentaene macrolide antibiotic, was the main antifungal component of TS3RO strain, as shown by thin-layer chromatography bioautography. This is the first report of an endophytic whorl-forming Streptomyces isolated from the medically important plant Catharanthus roseus.
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Tistaert C, Dejaegher B, Chataigné G, Rivière C, Nguyen Hoai N, Van MC, Quetin-Leclercq J, Vander Heyden Y. Potential antioxidant compounds in Mallotus species fingerprints. Part II: Fingerprint alignment, data analysis and peak identification. Anal Chim Acta 2012; 721:35-43. [DOI: 10.1016/j.aca.2012.01.058] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Revised: 11/10/2011] [Accepted: 01/27/2012] [Indexed: 11/28/2022]
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85
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Rafamantanana MH, Debrus B, Raoelison GE, Rozet E, Lebrun P, Uverg-Ratsimamanga S, Hubert P, Quetin-Leclercq J. Application of design of experiments and design space methodology for the HPLC-UV separation optimization of aporphine alkaloids from leaves of Spirospermum penduliflorum Thouars. J Pharm Biomed Anal 2012; 62:23-32. [DOI: 10.1016/j.jpba.2011.12.028] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2011] [Revised: 12/22/2011] [Accepted: 12/23/2011] [Indexed: 10/14/2022]
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86
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Kpadonou Kpoviessi BGH, Ladekan EY, Kpoviessi DSS, Gbaguidi F, Yehouenou B, Quetin-Leclercq J, Figueredo G, Moudachirou M, Accrombessi GC. Chemical Variation of Essential Oil Constituents of Ocimum gratissimum L. from Benin, and Impact on Antimicrobial Properties and Toxicity against Artemia salinaLeach. Chem Biodivers 2012; 9:139-50. [DOI: 10.1002/cbdv.201100194] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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87
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Bero J, Hannaert V, Chataigné G, Hérent MF, Quetin-Leclercq J. In vitro antitrypanosomal and antileishmanial activity of plants used in Benin in traditional medicine and bio-guided fractionation of the most active extract. JOURNAL OF ETHNOPHARMACOLOGY 2011; 137:998-1002. [PMID: 21782916 DOI: 10.1016/j.jep.2011.07.022] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2011] [Revised: 06/16/2011] [Accepted: 07/06/2011] [Indexed: 05/14/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The aim of the study was to evaluate the in vitro antitrypanosomal and antileishmanial activity of crude extracts of 10 plant species traditionally used in Benin to treat parasitic infections. MATERIALS AND METHODS For each species, dichloromethane, methanol and aqueous extracts were tested. Their antitrypanosomal and antileishmanial activities were evaluated in vitro on Trypanosoma brucei brucei (strain 427) (Tbb) and on promastigotes of Leishmania mexicana mexicana (MHOM/BZ/84/BEL46) (Lmm). RESULTS The best growth inhibition was observed with the dichloromethane extracts of aerial parts of Acanthospermum hispidum DC. (Asteraceae) (IC(50)=14.5 μg/ml on Tbb and 11.1 μg/ml on Lmm), twigs of Keetia leucantha (K. Krause) Bridson (syn. Plectronia leucantha Krause) (IC(50)=5.8 μg/ml on Tbb), aerial parts of Byrsocarpus coccineus Schumach. & Thonn (syn. Rourea coccinea (Schumach. & Thonn.) Hook.f.) (IC(50)=14.7 μg/ml on Tbb) and aerial parts of Carpolobia lutea G.Don. (IC(50)=18.3 μg/ml on Tbb). All these extracts had a low cytotoxicity. It is not the case for the methanolic and water extracts of roots of Anchomanes difformis (Blume) Engl. (IC(50)=14.7 and 13.8 μg/ml on Tbb) which were toxic at the same concentration range on WI38, human cells. A bio-guided fractionation of the most active extract of Keetia leucantha allowed to identify oleanolic acid and ursolic acid as responsible for the observed activities. CONCLUSION Our study gives some justification for antiparasitic activity of some investigated plants.
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Hong VN, Rivière C, Hong QT, Chataigné G, Hoai NN, Dejaegher B, Tistaert C, Kim TN, Van KP, Heyden YV, Van MC, Quetin-Leclercq J. Identification by LC-ESIMS of Flavonoids Responsible for the Antioxidant Properties of Mallotus Species from Vietnam. Nat Prod Commun 2011. [DOI: 10.1177/1934578x1100600616] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Several Mallotus species (Euphorbiaceae) are used in Vietnam as edible plants or as traditional medicines for different indications, some related to the treatment of inflammatory diseases. This study investigated the antioxidant activities of 33 samples from 17 Vietnamese Mallotus species. We also evaluated potential cytotoxic activity against human cervix carcinoma HeLa and human lung fibroblast WI-38 cells. Our aim is to develop safe dietary supplements with a protective effect against various diseases caused by tissue damage and the acceleration of the aging process linked to reactive oxygen species. These tests allowed the identification of non-cytotoxic plant species exhibiting significant antiradical properties. These antioxidant properties may be explained by their polyphenol composition. The antioxidant activity of the most active Mallotus species was further analyzed with and without tannins removal. We also identified by LC-ESIMS some flavonoids responsible for a part of this activity.
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89
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Van Hong NT, Rivière C, Hong QT, Chataigné G, Hoai NN, Dejaegher B, Tistaert C, Kim TNT, Van Kiem P, Vander Heyden Y, Van MC, Quetin-Leclercq J. Identification by LC-ESI-MS of flavonoids responsible for the antioxidant properties of Mallotus species from Vietnam. Nat Prod Commun 2011; 6:813-818. [PMID: 21815417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023] Open
Abstract
Several Mallotus species (Euphorbiaceae) are used in Vietnam as edible plants or as traditional medicines for different indications, some related to the treatment of inflammatory diseases. This study investigated the antioxidant activities of 33 samples from 17 Vietnamese Mallotus species. We also evaluated potential cytotoxic activity against human cervix carcinoma HeLa and human lung fibroblast WI-38 cells. Our aim is to develop safe dietary supplements with a protective effect against various diseases caused by tissue damage and the acceleration of the aging process linked to reactive oxygen species. These tests allowed the identification of non-cytotoxic plant species exhibiting significant antiradical properties. These antioxidant properties may be explained by their polyphenol composition. The antioxidant activity of the most active Mallotus species was further analyzed with and without tannins removal. We also identified by LC-ESI-MS some flavonoids responsible for a part of this activity.
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González-Díaz H, Prado-Prado F, Sobarzo-Sánchez E, Haddad M, Maurel Chevalley S, Valentin A, Quetin-Leclercq J, Dea-Ayuela MA, Teresa Gomez-Muños M, Munteanu CR, José Torres-Labandeira J, García-Mera X, Tapia RA, Ubeira FM. NL MIND-BEST: A web server for ligands and proteins discovery—Theoretic-experimental study of proteins of Giardia lamblia and new compounds active against Plasmodium falciparum. J Theor Biol 2011; 276:229-49. [DOI: 10.1016/j.jtbi.2011.01.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Revised: 12/02/2010] [Accepted: 01/10/2011] [Indexed: 10/18/2022]
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91
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Wright CW, O'Neill MJ, Phillipson JD, Warhurst DC, Angenot L, Quetin-Leclercq J. Antiamoebic Activity of Indole Analogues of Emetine with In-Vitro Potency Greater than that of Emetine. J Pharm Pharmacol 2011. [DOI: 10.1111/j.2042-7158.1990.tb14467.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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92
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Yemoa A, Gbenou J, Affolabi D, Moudachirou M, Bigot A, Anagonou S, Portaels F, Quetin-Leclercq J, Martin A. Buruli ulcer: a review of in vitro tests to screen natural products for activity against Mycobacterium ulcerans. PLANTA MEDICA 2011; 77:641-646. [PMID: 21240839 DOI: 10.1055/s-0030-1250642] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Buruli ulcer (BU), caused by Mycobacterium ulcerans, has recently been recognized by the World Health Organization (WHO) as an important emerging disease. It is largely a problem of the poor in remote rural areas and has emerged as an important cause of human suffering. While antimycobacterial therapy is often effective for the earliest nodular or ulcerative lesions, for advanced ulcerated lesions, surgery is sometimes necessary. Antimycobacterial drugs may also prevent relapses or disseminated infections. Efficient alternatives different from surgery are presently explored because this treatment deals with huge restrictive factors such as the necessity of prolonged hospitalization, its high cost, and the scars after surgery. Traditional treatment remains the first option for poor populations of remote areas who may have problems of accessibility to synthetic products because of their high cost. The search for efficient natural products active on M. ulcerans should then be encouraged because they are part of the natural heritage of these populations; they are affordable financially and can be used at the earliest stage. This review provides a number of tests that will help to evaluate the antimycobacterial activity of natural products against M. ulcerans, which are adapted to its slow growing rate, and lists active extracts published up to now in Medline.
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93
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Bero J, Quetin-Leclercq J. Natural products published in 2009 from plants traditionally used to treat malaria. PLANTA MEDICA 2011; 77:631-40. [PMID: 20960389 DOI: 10.1055/s-0030-1250405] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Malaria is a major parasitic disease and is responsible for almost one million deaths each year in Africa. There is an urgent need to discover new active compounds. Nature and particularly plants are a potential source of new antimalarial drugs since they contain a quantity of metabolites with a great variety of structures and pharmacological activities. This review covers the compounds with antiplasmodial activity isolated from plants which have been published during 2009 organized according to their phytochemical classes. Details are given for substances with IC₅₀ values ≤ 11 µM. Sixty-seven references are identified.
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Hage S, Kienlen-Campard P, Octave JN, Quetin-Leclercq J. In vitro screening on β-amyloid peptide production of plants used in traditional medicine for cognitive disorders. JOURNAL OF ETHNOPHARMACOLOGY 2010; 131:585-591. [PMID: 20673795 DOI: 10.1016/j.jep.2010.07.044] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2010] [Revised: 07/16/2010] [Accepted: 07/20/2010] [Indexed: 05/29/2023]
Abstract
AIM OF THE STUDY The aim of the study was to investigate the activity on β-amyloid peptide production of crude extracts of 9 plant species traditionally used in Benin or in Madagascar for the treatment of cognitive disorders, in order to select candidates for Alzheimer's disease treatment. MATERIALS AND METHODS For each species, hexane, dichloromethane, ethyl-acetate and water extracts were tested, at non-toxic concentrations, on CHO cells overexpressing the human neuronal β-amyloid peptide precursor (APP695) to measure variations of APP processing (by Western-blotting) and, for the most active, of Aβ-amyloid production (by ECLIA). RESULTS We observed, at non-toxic concentrations, a significant increase in CTF/APP ratio with Oldenlandia affinis cyclotide-enriched fraction, Prosopis africana EtOAc extract, Pterocarpus erinaceus aqueous extract and Trichilia emetica hexane extract. We also showed that the Pterocarpus erinaceus extract significantly decreased Aβ production, displaying effects similar to those of DAPT (γ-secretase inhibitor) on APP processing, but may act on another inhibition site. CONCLUSION These active extracts are worth further studies to isolate the compounds responsible for the observed activities, to analyze their mode of action and determine their clinical potentials.
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Robert S, Baccelli C, Devel P, Dogné JM, Quetin-Leclercq J. Effects of leaf extracts from Croton zambesicus Müell. Arg. on hemostasis. JOURNAL OF ETHNOPHARMACOLOGY 2010; 128:641-648. [PMID: 20219668 DOI: 10.1016/j.jep.2010.02.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2009] [Accepted: 02/23/2010] [Indexed: 05/28/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The leaf decoction of Croton zambesicus Müell. Arg. (Euphorbiaceae; syn. Croton amabilis Müell. Arg., Croton gratissimus Burch) is traditionally used in Benin to treat hypertension. AIM OF THE STUDY As hypertension and thromboembolism are often associated in several cardiovascular diseases, we studied the potential effects of leaf extracts from Croton zambesicus on hemostasis. MATERIALS AND METHODS We prepared the dichloromethane and aqueous extracts from the air-dried leaves of Croton zambesicus and separated the aqueous extract in its aqueous and dichloromethane fractions. The potential effects of these four extracts/fractions were investigated on red blood cells integrity using spectrophotometric lysis assays, on primary hemostasis using platelet aggregation studies and on secondary hemostasis using calibrated automated thrombin generation assays and coagulation factors inhibition tests. RESULTS In the in vitro testing, we found that none of the tested extracts/fractions exhibit hemolytic or antiplatelet activity. However, they display a moderate but significant anticoagulant activity which would be mediated through the direct inhibition of thrombin, FXa and TF/FVIIa. The active anticoagulant compound(s) seem to be mainly in the aqueous extract and especially in its aqueous fraction. CONCLUSIONS This experimental work reported for the first time the anticoagulant effect of leaf extracts from Croton zambesicus. These findings are of particular interest as the leaves from Croton zambesicus are commonly used in infusion by local population and may provide a new natural source for the development of original anticoagulant agents. Furthermore, this activity, associated with the vasorelaxant properties of some of its diterpenes may prove to be interesting for the prevention of cardiovascular diseases in traditional medicine.
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Bero J, Frédérich M, Quetin-Leclercq J. Antimalarial compounds isolated from plants used in traditional medicine. THE JOURNAL OF PHARMACY AND PHARMACOLOGY 2010; 61:1401-33. [PMID: 19903367 DOI: 10.1211/jpp/61.11.0001] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
OBJECTIVES This review covers the compounds with antiplasmodial activity isolated from plants published from 2005 to the end of 2008, organized according to their phytochemical classes. Details are given for substances with IC50 values < or = 11 microm. KEY FINDINGS Malaria is a major parasitic disease in many tropical and subtropical regions and is responsible for more than 1 million deaths each year in Africa. The rapid spread of resistance encourages the search for new active compounds. Nature and particularly plants used in traditional medicine are a potential source of new antimalarial drugs as they contain molecules with a great variety of structures and pharmacological activities. SUMMARY A large number of antimalarial compounds with a wide variety of structures have been isolated from plants and can play a role in the development of new antimalarial drugs. Ethnopharmacological approaches appear to be a promising way to find plant metabolites that could be used as templates for designing new derivatives with improved properties.
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Mai NT, Cuong NX, Thao NP, Nam NH, Khoi NH, Minh CV, Heyden YV, Thuan NT, Tuyen NV, Quetin-Leclercq J, Kiem PV. A new lignan dimer from Mallotus philippensis. Nat Prod Commun 2010; 5:423-426. [PMID: 20420321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2023] Open
Abstract
A new lignan dimer, bilariciresinol (1), was isolated from the leaves of Mallotus philippensis, along with platanoside (2), isovitexin (3), dihydromyricetin (4), bergenin (5), 4-O-galloylbergenin (6), and pachysandiol A (7). Their structures were elucidated by spectroscopic experiments including 1D and 2D NMR and FTICR-MS.
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Mai NT, Cuong NX, Thao NP, Nam NH, Khoi NH, Van Minh C, Heyden YV, Thuan NT, Van Tuyen N, Quetin-Leclercq J, Van Kiem P. A New Lignan Dimer from Mallotus philippensis. Nat Prod Commun 2010. [DOI: 10.1177/1934578x1000500317] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A new lignan dimer, bilariciresinol (1), was isolated from the leaves of Mallotus philippensis, along with platanoside (2), isovitexin (3), dihydromyricetin (4), bergenin (5), 4 -O-galloylbergenin (6), and pachysandiol A (7). Their structures were elucidated by spectroscopic experiments including 1D and 2D NMR and FTICR-MS.
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Ngombe NK, Kalenda DT, Quetin-Leclercq J, Morel N. Vasoconstrictor and Inotropic Effects Induced by the Root Bark Extracts of Anthocleista schweinfurthii. Nat Prod Commun 2010. [DOI: 10.1177/1934578x1000500305] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The present study was undertaken to investigate the cardiovascular effect of three extracts from the root bark of Anthocleista schweinfurthii Gilg.: an aqueous extract (AE), a dichloromethane extract (DCMR) and a fraction enriched in cardiac glycoside type compounds (CARDAN). In isolated perfused frog heart, bolus injection of the extracts produced a positive inotropic effect. The responses to AE and DCMR, but not to CARDAN, were depressed by propranolol. In isolated rat aorta, DCMR produced a transient increase in contractile tension while AE and CARDAN induced a sustained constriction. AE vasoconstrictor effect was abolished by phentolamine, while contraction evoked by CARDAN was antagonized by verapamil. In aortic rings contracted in low K+ media, the addition of K+ evoked a relaxation, which was abolished by ouabain, depressed by DCMR but not affected by either AE or CARDAN. These observations indicate that Anthocleista schweinfurthii contains substances that promote vasoconstriction and increase cardiac contraction. The effect of DCMR was only partially mediated by inhibition of the Na+ pump while the mechanism of action of AE and CARDAN was distinct from the inhibition of the Na+,K+-ATPase pump, but could involve adrenergic receptors, or either direct or indirect activation of L-type calcium channels.
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Ngombe NK, Kalenda DT, Quetin-Leclercq J, Morel N. Vasoconstrictor and inotropic effects induced by the root bark extracts of Anthocleista schweinfurthii. Nat Prod Commun 2010; 5:369-372. [PMID: 20420309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2023] Open
Abstract
The present study was undertaken to investigate the cardiovascular effect of three extracts from the root bark of Anthocleista schweinfurthii Gilg.: an aqueous extract (AE), a dichloromethane extract (DCMR) and a fraction enriched in cardiac glycoside type compounds (CARDAN). In isolated perfused frog heart, bolus injection of the extracts produced a positive inotropic effect. The responses to AE and DCMR, but not to CARDAN, were depressed by propranolol. In isolated rat aorta, DCMR produced a transient increase in contractile tension while AE and CARDAN induced a sustained constriction. AE vasoconstrictor effect was abolished by phentolamine, while contraction evoked by CARDAN was antagonized by verapamil. In aortic rings contracted in low K+ media, the addition of K+ evoked a relaxation, which was abolished by ouabain, depressed by DCMR but not affected by either A(E) or CARDAN. These observations indicate that Anthocleista schweinfurthii contains substances that promote vasoconstriction and increase cardiac contraction. The effect of DCMR was only partially mediated by inhibition of the Na+ pump while the mechanism of action of A(E) and CARDAN was distinct from the inhibition of the Na+, K+ - ATPase pump, but could involve adrenergic receptors, or either direct or indirect activation of L-type calcium channels.
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