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Heu K, Romoli O, Schönbeck JC, Ajenoe R, Epelboin Y, Kircher V, Houël E, Estevez Y, Gendrin M. The Effect of Secondary Metabolites Produced by Serratia marcescens on Aedes aegypti and Its Microbiota. Front Microbiol 2021; 12:645701. [PMID: 34305822 PMCID: PMC8294061 DOI: 10.3389/fmicb.2021.645701] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [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: 12/23/2020] [Accepted: 05/28/2021] [Indexed: 01/04/2023] Open
Abstract
Serratia marcescens is a bacterial species widely found in the environment, which very efficiently colonizes mosquitoes. In this study, we isolated a red-pigmented S. marcescens strain from our mosquito colony (called S. marcescens VA). This red pigmentation is caused by the production of prodigiosin, a molecule with antibacterial properties. To investigate the role of prodigiosin on mosquito-S. marcescens interactions, we produced two white mutants of S. marcescens VA by random mutagenesis. Whole genome sequencing and chemical analyses suggest that one mutant has a nonsense mutation in the gene encoding prodigiosin synthase, while the other one is deficient in the production of several types of secondary metabolites including prodigiosin and serratamolide. We used our mutants to investigate how S. marcescens secondary metabolites affect the mosquito and its microbiota. Our in vitro tests indicated that S. marcescens VA inhibits the growth of several mosquito microbiota isolates using a combination of prodigiosin and other secondary metabolites, corroborating published data. This strain requires secondary metabolites other than prodigiosin for its proteolytic and hemolytic activities. In the mosquito, we observed that S. marcescens VA is highly virulent to larvae in a prodigiosin-dependent manner, while its virulence on adults is lower and largely depends on other metabolites.
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Affiliation(s)
- Katy Heu
- Microbiota of Insect Vectors Group, Institut Pasteur de la Guyane, Cayenne, France
| | - Ottavia Romoli
- Microbiota of Insect Vectors Group, Institut Pasteur de la Guyane, Cayenne, France
| | | | - Rachel Ajenoe
- Microbiota of Insect Vectors Group, Institut Pasteur de la Guyane, Cayenne, France
| | - Yanouk Epelboin
- Microbiota of Insect Vectors Group, Institut Pasteur de la Guyane, Cayenne, France
| | - Verena Kircher
- Microbiota of Insect Vectors Group, Institut Pasteur de la Guyane, Cayenne, France
| | - Emeline Houël
- CNRS, UMR EcoFoG, AgroParisTech, Cirad, INRAE, Université des Antilles, Université de Guyane, Cayenne, France
| | - Yannick Estevez
- CNRS, UMR EcoFoG, AgroParisTech, Cirad, INRAE, Université des Antilles, Université de Guyane, Cayenne, France
| | - Mathilde Gendrin
- Microbiota of Insect Vectors Group, Institut Pasteur de la Guyane, Cayenne, France.,Parasites and Insect Vectors Department, Institut Pasteur, Paris, France
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2
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Falkowski M, Jahn-Oyac A, Odonne G, Flora C, Estevez Y, Touré S, Boulogne I, Robinson JC, Béreau D, Petit P, Azam D, Coke M, Issaly J, Gaborit P, Stien D, Eparvier V, Dusfour I, Houël E. Towards the optimization of botanical insecticides research: Aedes aegypti larvicidal natural products in French Guiana. Acta Trop 2020; 201:105179. [PMID: 31539525 DOI: 10.1016/j.actatropica.2019.105179] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 08/23/2019] [Accepted: 09/16/2019] [Indexed: 11/18/2022]
Abstract
Natural products have proven to be an immeasurable source of bioactive compounds. The exceptional biodiversity encountered in Amazonia, alongside a rich entomofauna and frequent interactions with various herbivores is the crucible of a promising chemodiversity. This prompted us to search for novel botanical insecticides in French Guiana. As this French overseas department faces severe issues linked to insects, notably the strong incidence of vector-borne infectious diseases, we decided to focus our research on products able to control the mosquito Aedes aegypti. We tested 452 extracts obtained from 85 species originating from 36 botanical families and collected in contrasted environments against an Ae. aegypti laboratory strain susceptible to all insecticides, and a natural population resistant to both pyrethroid and organophosphate insecticides collected in Cayenne for the most active of them. Eight species (Maytenus oblongata Reissek, Celastraceae; Costus erythrothyrsus Loes., Costaceae; Humiria balsamifera Aubl., Humiriaceae; Sextonia rubra (Mez) van der Werff, Lauraceae; Piper hispidum Sw., Piperaceae; Laetia procera (Poepp.) Eichl., Salicaceae; Matayba arborescens (Aubl.) Radlk., Sapindaceae; and Cupania scrobitulata Rich., Sapindaceae) led to extracts exhibiting more than 50% larval mortality after 48 h of exposition at 100 µg/mL against the natural population and were considered active. Selectivity and phytochemistry of these extracts were therefore investigated and discussed, and some active compounds highlighted. Multivariate analysis highlighted that solvents, plant tissues, plant family and location had a significant effect on mortality while light, available resources and vegetation type did not. Through this case study we highlighted that plant defensive chemistry mechanisms are crucial while searching for novel insecticidal products.
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Affiliation(s)
- Michaël Falkowski
- CNRS, UMR EcoFoG, AgroParisTech, Cirad, INRA, Université des Antilles, Université de Guyane, 97300 Cayenne, France
| | - Arnaud Jahn-Oyac
- CNRS, UMR EcoFoG, AgroParisTech, Cirad, INRA, Université des Antilles, Université de Guyane, 97300 Cayenne, France
| | - Guillaume Odonne
- Laboratoire Ecologie, Evolution, Interactions des Systèmes Amazoniens (LEEISA), CNRS, Université de Guyane, IFREMER, 97300 Cayenne, France
| | - Claudiane Flora
- CNRS, UMR EcoFoG, AgroParisTech, Cirad, INRA, Université des Antilles, Université de Guyane, 97300 Cayenne, France
| | - Yannick Estevez
- CNRS, UMR EcoFoG, AgroParisTech, Cirad, INRA, Université des Antilles, Université de Guyane, 97300 Cayenne, France
| | - Seindé Touré
- CNRS, UMR EcoFoG, AgroParisTech, Cirad, INRA, Université des Antilles, Université de Guyane, 97300 Cayenne, France; CNRS, Institut de Chimie des Substances Naturelles, UPR2301, Université Paris Saclay, 91198 Gif-sur-Yvette, France
| | - Isabelle Boulogne
- CNRS, UMR EcoFoG, AgroParisTech, Cirad, INRA, Université des Antilles, Université de Guyane, 97300 Cayenne, France; Université des Antilles, Campus de Fouillole, 97157 Pointe-à-Pitre Cedex, Guadeloupe, France; Université de ROUEN, UFR des Sciences et Techniques, Laboratoire Glycobiologie et Matrice Extracellulaire Végétale, UPRES-EA 4358, Fédération de Recherche « Normandie Végétal » FED 4277, 76821, Mont-Saint-Aignan, France
| | - Jean-Charles Robinson
- Université de Guyane, Laboratoire COVAPAM, UMR QualiSud, Campus universitaire de Troubiran, BP 792, 97337 Cayenne cedex, France
| | - Didier Béreau
- Université de Guyane, Laboratoire COVAPAM, UMR QualiSud, Campus universitaire de Troubiran, BP 792, 97337 Cayenne cedex, France
| | - Philippe Petit
- Université des Antilles, Campus de Fouillole, 97157 Pointe-à-Pitre Cedex, Guadeloupe, France
| | - Didier Azam
- Unité Expérimentale d'Ecologie et d'Ecotoxicologie Aquatique, INRA-U3E, 35042 Rennes, France
| | - Maïra Coke
- Unité Expérimentale d'Ecologie et d'Ecotoxicologie Aquatique, INRA-U3E, 35042 Rennes, France
| | - Jean Issaly
- Institut Pasteur de la Guyane, Vectopôle Amazonien Emile Abonnenc, Unité Contrôle et Adaptation des vecteurs, 23 avenue Pasteur, BP6010, 97306 Cayenne cedex, France
| | - Pascal Gaborit
- Institut Pasteur de la Guyane, Vectopôle Amazonien Emile Abonnenc, Unité Contrôle et Adaptation des vecteurs, 23 avenue Pasteur, BP6010, 97306 Cayenne cedex, France
| | - Didier Stien
- Sorbonne Université, CNRS, Laboratoire de Biodiversité et Biotechnologie Microbienne, LBBM, Observatoire Océanologique, 66650 Banyuls-sur-mer, France
| | - Véronique Eparvier
- CNRS, Institut de Chimie des Substances Naturelles, UPR2301, Université Paris Saclay, 91198 Gif-sur-Yvette, France
| | - Isabelle Dusfour
- Institut Pasteur de la Guyane, Vectopôle Amazonien Emile Abonnenc, Unité Contrôle et Adaptation des vecteurs, 23 avenue Pasteur, BP6010, 97306 Cayenne cedex, France; INRS-Institut Armand Frappier, Groupe recherche en écologie microbienne, 531 boulevard des prairies, Laval H7V 1B7, QC, Canada.
| | - Emeline Houël
- CNRS, UMR EcoFoG, AgroParisTech, Cirad, INRA, Université des Antilles, Université de Guyane, 97300 Cayenne, France.
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Duplais C, Estevez Y. Tandem Biocatalysis Unlocks the Challenging de Novo Production of Plant Natural Products. Chembiochem 2017; 18:2192-2195. [PMID: 28940553 DOI: 10.1002/cbic.201700508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Indexed: 11/09/2022]
Abstract
Intimate partnership: Knowledge of the biocatalytic cascades in different cellular compartments is limited, but deciphering these systems in nature can be used to inspire synthetic strategies. Two studies report new insights into the biosynthesis of alkaloids and sesterterpenoids in plants. This highlight presents these novel biotransformations to illustrate how tandem biocatalysis can impact the future of natural product production.
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Affiliation(s)
- Christophe Duplais
- CNRS, UMR8172 EcoFoG, AgroParisTech, Cirad, INRA, Université des Antilles, Université de Guyane, Campus agronomique avenue de France, 97379, Kourou, French Guiana, France
| | - Yannick Estevez
- CNRS, UMR8172 EcoFoG, AgroParisTech, Cirad, INRA, Université des Antilles, Université de Guyane, Campus agronomique avenue de France, 97379, Kourou, French Guiana, France
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Leba LJ, Popovici J, Estevez Y, Pelleau S, Legrand E, Musset L, Duplais C. Antiplasmodial activities of dyes against Plasmodium falciparum asexual and sexual stages: Contrasted uptakes of triarylmethanes Brilliant green, Green S (E142), and Patent Blue V (E131) by erythrocytes. Int J Parasitol Drugs Drug Resist 2017; 7:314-320. [PMID: 28886443 PMCID: PMC5587875 DOI: 10.1016/j.ijpddr.2017.07.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 07/27/2017] [Accepted: 07/31/2017] [Indexed: 11/07/2022]
Abstract
The search for safe antimalarial compounds acting against asexual symptom-responsible stages and sexual transmission-responsible forms of Plasmodium species is one of the major challenges in malaria elimination programs. So far, among current drugs approved for human use, only primaquine has transmission-blocking activity. The discovery of small molecules targeting different Plasmodium falciparum life stages remains a priority in antimalarial drug research. In this context, several independent studies have recently reported antiplasmodial and transmission-blocking activities of commonly used stains, dyes and fluorescent probes against P. falciparum including chloroquine-resistant isolates. Herein we have studied the antimalarial activities of dyes with different scaffold and we report that the triarylmethane dye (TRAM) Brilliant green inhibits the growth of asexual stages (IC50 ≤ 2 μM) and has exflagellation-blocking activity (IC50 ≤ 800 nM) against P. falciparum reference strains (3D7, 7G8) and chloroquine-resistant clinical isolate (Q206). In a second step we have investigated the antiplasmodial activities of two polysulfonated triarylmethane food dyes. Green S (E142) is weakly active against P. falciparum asexual stage (IC50 ≃ 17 μM) whereas Patent Blue V (E131) is inactive in both antimalarial assays. By applying liquid chromatography techniques for the culture supernatant analysis after cell washings and lysis, we report the detection of Brilliant green in erythrocytes, the selective uptake of Green S (E142) by infected erythrocytes, whereas Patent Blue V (E131) could not be detected within non-infected and 3D7-infected erythrocytes. Overall, our results suggest that two polysulfonated food dyes might display different affinity with transporters or channels on infected RBC membrane. Dyes are tested against P. falciparum 3D7, 7G8 lines, CQ-resistant field isolate Q206. Brilliant green is active against asexual and sexual stages of Plasmodium falciparum. Food dye Green S (E142) is weakly active against Plasmodium falciparum asexual forms. Food dye Green S (E142) is found in the cellular content of infected erythrocytes. Polysulfonated triarylmethane possibly interact with plasmodial surface anion channel.
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Affiliation(s)
- Louis-Jérôme Leba
- Laboratoire de parasitologie, CNR du paludisme, Institut Pasteur de la Guyane, Cayenne, French Guiana, France; UMR QualiSud, Université de Guyane, 97300 Cayenne, France
| | - Jean Popovici
- Malaria Molecular Epidemiology Unit, Institut Pasteur in Cambodia, Phnom Penh, Cambodia
| | - Yannick Estevez
- CNRS, UMR8172 EcoFoG, AgroParisTech, Cirad, INRA, Université des Antilles, Université de Guyane, 97300 Cayenne, French Guiana, France
| | - Stéphane Pelleau
- Laboratoire de parasitologie, CNR du paludisme, Institut Pasteur de la Guyane, Cayenne, French Guiana, France
| | - Eric Legrand
- Laboratoire de parasitologie, CNR du paludisme, Institut Pasteur de la Guyane, Cayenne, French Guiana, France; Research Unit of Genetics and Genomics of Insect Vectors Institut Pasteur, Paris, France
| | - Lise Musset
- Laboratoire de parasitologie, CNR du paludisme, Institut Pasteur de la Guyane, Cayenne, French Guiana, France
| | - Christophe Duplais
- CNRS, UMR8172 EcoFoG, AgroParisTech, Cirad, INRA, Université des Antilles, Université de Guyane, 97300 Cayenne, French Guiana, France.
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Berthelot K, Estevez Y, Quiliano M, Baldera-Aguayo PA, Zimic M, Pribat A, Bakleh ME, Teyssier E, Gallusci P, Gardrat C, Lecomte S, Peruch F. HbIDI, SlIDI and EcIDI: A comparative study of isopentenyl diphosphate isomerase activity and structure. Biochimie 2016; 127:133-43. [PMID: 27163845 DOI: 10.1016/j.biochi.2016.05.005] [Citation(s) in RCA: 2] [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] [Received: 02/15/2016] [Accepted: 05/02/2016] [Indexed: 10/21/2022]
Abstract
In this study, we cloned, expressed and purified the isopentenyl diphosphate isomerases (IDIs) from two plants, Hevea brasiliensis and Solanum lycopersicum, and compared them to the already well characterized Escherichia coli IDI. Phylogenetic analysis showed high homology between the three enzymes. Their catalytic activity was investigated in vitro with recombinant purified enzymes and in vivo by complementation colorimetric tests. The three enzymes displayed consistent activities both in vitro and in vivo. In term of structure, studied by ATR-FTIR and molecular modeling, it is clear that both plant enzymes are more related to their human homologue than to E. coli IDI. But it is assumed that EcIDI represent the minimalistic part of the catalytic core, as both plant enzymes present a supplementary sequence forming an extra α-helice surrounding the catalytic site that could facilitate the biocatalysis. New potential biotechnological applications may be envisaged.
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Affiliation(s)
- Karine Berthelot
- CNRS, LCPO, UMR 5629, Univ. Bordeaux, Bordeaux INP, F-33600, Pessac, France; CNRS, CBMN, UMR 5248, Univ. Bordeaux, Bordeaux INP, F-33600, Pessac, France.
| | - Yannick Estevez
- CNRS, LCPO, UMR 5629, Univ. Bordeaux, Bordeaux INP, F-33600, Pessac, France
| | - Miguel Quiliano
- Departamento de Química Orgánica y Farmacéutica, Facultad de Farmacia y Nutrición, Universidad de Navarra, C/. Irunlarrea 1, 31008, Pamplona, Navarra, Spain
| | - Pedro A Baldera-Aguayo
- Department of Systems Biology and Integrated Program in Cellular, Molecular and Biomedical Studies, Columbia University in the City of New York, NY, 10032, USA; Laboratorio de Bioinformática y Biología Molecular, Laboratorios de Investigación y Desarrollo, Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, San Martin de Porres, Lima, 31, Peru
| | - Mirko Zimic
- Laboratorio de Bioinformática y Biología Molecular, Laboratorios de Investigación y Desarrollo, Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, San Martin de Porres, Lima, 31, Peru
| | - Anne Pribat
- INRA Bordeaux-Aquitaine, UMR 1332 Biologie du Fruit et Pathologie, F-33882, Villenave d'Ornon, France
| | - Marc-Elias Bakleh
- CNRS, LCPO, UMR 5629, Univ. Bordeaux, Bordeaux INP, F-33600, Pessac, France
| | - Emeline Teyssier
- Univ. Bordeaux, Grape Ecophysiology and Functional Biology Laboratory, ISVV, F-33882, Villenave d'Ornon, France
| | - Philippe Gallusci
- Univ. Bordeaux, Grape Ecophysiology and Functional Biology Laboratory, ISVV, F-33882, Villenave d'Ornon, France
| | - Christian Gardrat
- CNRS, LCPO, UMR 5629, Univ. Bordeaux, Bordeaux INP, F-33600, Pessac, France
| | - Sophie Lecomte
- CNRS, CBMN, UMR 5248, Univ. Bordeaux, Bordeaux INP, F-33600, Pessac, France
| | - Frédéric Peruch
- CNRS, LCPO, UMR 5629, Univ. Bordeaux, Bordeaux INP, F-33600, Pessac, France.
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Bossu J, Beauchêne J, Estevez Y, Duplais C, Clair B. New Insights on Wood Dimensional Stability Influenced by Secondary Metabolites: The Case of a Fast-Growing Tropical Species Bagassa guianensis Aubl. PLoS One 2016; 11:e0150777. [PMID: 27007687 PMCID: PMC4805377 DOI: 10.1371/journal.pone.0150777] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [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: 10/20/2015] [Accepted: 02/17/2016] [Indexed: 12/04/2022] Open
Abstract
Challenging evaluation of tropical forest biodiversity requires the reporting of taxonomic diversity but also the systematic characterization of wood properties in order to discover new promising species for timber industry. Among wood properties, the dimensional stability is regarded as a major technological characteristic to validate whether a wood species is adapted to commercial uses. Cell structure and organization are known to influence the drying shrinkage making wood density and microfibrils angle markers of choice to predict wood dimensional stability. On the contrary the role of wood extractive content remains unclear. This work focuses on the fast-growing tropical species Bagassa guianensis and we report herein a correlation between heartwood drying shrinkage and extractive content. Chemical extractions and shrinkage experiments were performed on separate wood twin samples to better evaluate correctly how secondary metabolites influence the wood shrinkage behaviour. Extractive content were qualitatively and quantitatively analysed using HPLC and NMR spectroscopy. We found that B guianensis heartwood has a homogeneous low shrinkage along its radius that could not be explained only by its basic density. In fact the low drying shrinkage is correlated to the high extractive content and a corrected model to improve the prediction of wood dimensional stability is presented. Additionally NMR experiments conducted on sapwood and heartwood extracts demonstrate that secondary metabolites biosynthesis occurs in sapwood thus revealing B. guianensis as a Juglans-Type heartwood formation. This work demonstrates that B. guianensis, a fast-growing species associated with high durability and high dimensional stability, is a good candidate for lumber production and commercial purposes.
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Affiliation(s)
- Julie Bossu
- CNRS, UMR EcoFoG, AgroParisTech, Cirad, INRA, Université des Antilles, Université de Guyane, 97310 Kourou, France
- Cirad, UMR EcoFoG, AgroParisTech, CNRS, INRA, Université des Antilles, Université de Guyane, 97310 Kourou, France
- * E-mail:
| | - Jacques Beauchêne
- Cirad, UMR EcoFoG, AgroParisTech, CNRS, INRA, Université des Antilles, Université de Guyane, 97310 Kourou, France
| | - Yannick Estevez
- CNRS, UMR EcoFoG, AgroParisTech, Cirad, INRA, Université des Antilles, Université de Guyane, 97310 Kourou, France
| | - Christophe Duplais
- CNRS, UMR EcoFoG, AgroParisTech, Cirad, INRA, Université des Antilles, Université de Guyane, 97310 Kourou, France
| | - Bruno Clair
- CNRS, UMR EcoFoG, AgroParisTech, Cirad, INRA, Université des Antilles, Université de Guyane, 97310 Kourou, France
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Leba LJ, Musset L, Pelleau S, Estevez Y, Birer C, Briolant S, Witkowski B, Ménard D, Delves MJ, Legrand E, Duplais C, Popovici J. Use of Plasmodium falciparum culture-adapted field isolates for in vitro exflagellation-blocking assay. Malar J 2015; 14:234. [PMID: 26040313 PMCID: PMC4464717 DOI: 10.1186/s12936-015-0752-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [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: 04/14/2015] [Accepted: 05/27/2015] [Indexed: 12/01/2022] Open
Abstract
Background A major requirement for malaria elimination is the development of transmission-blocking interventions. In vitro transmission-blocking bioassays currently mostly rely on the use of very few Plasmodium falciparum reference laboratory strains isolated decades ago. To fill a piece of the gap between laboratory experimental models and natural systems, the purpose of this work was to determine if culture-adapted field isolates of P. falciparum are suitable for in vitro transmission-blocking bioassays targeting functional maturity of male gametocytes: exflagellation. Methods Plasmodium falciparum isolates were adapted to in vitro culture before being used for in vitro gametocyte production. Maturation was assessed by microscopic observation of gametocyte morphology over time of culture and the functional viability of male gametocytes was assessed by microscopic counting of exflagellating gametocytes. Suitability for in vitro exflagellation-blocking bioassays was determined using dihydroartemisinin and methylene blue. Results In vitro gametocyte production was achieved using two isolates from French Guiana and two isolates from Cambodia. Functional maturity of male gametocytes was assessed by exflagellation observations and all four isolates could be used in exflagellation-blocking bioassays with adequate response to methylene blue and dihydroartemisinin. Conclusion This work shows that in vitro culture-adapted P. falciparum field isolates of different genetic background, from South America and Southeast Asia, can successfully be used for bioassays targeting the male gametocyte to gamete transition, exflagellation. Electronic supplementary material The online version of this article (doi:10.1186/s12936-015-0752-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Louis-Jérôme Leba
- Laboratoire de Parasitologie, Institut Pasteur de la Guyane, Cayenne, French Guiana, France. .,Laboratoire ECOFOG (Ecology of Guiana Forests) UMR8172 CNRS-INRA-CIRAD-AgroParisTech-Université des Antilles-Université de la Guyane, French Guiana, France.
| | - Lise Musset
- Laboratoire de Parasitologie, Institut Pasteur de la Guyane, Cayenne, French Guiana, France.
| | - Stéphane Pelleau
- Laboratoire de Parasitologie, Institut Pasteur de la Guyane, Cayenne, French Guiana, France.
| | - Yannick Estevez
- Laboratoire ECOFOG (Ecology of Guiana Forests) UMR8172 CNRS-INRA-CIRAD-AgroParisTech-Université des Antilles-Université de la Guyane, French Guiana, France.
| | - Caroline Birer
- Laboratoire ECOFOG (Ecology of Guiana Forests) UMR8172 CNRS-INRA-CIRAD-AgroParisTech-Université des Antilles-Université de la Guyane, French Guiana, France.
| | - Sébastien Briolant
- Laboratoire de Parasitologie, Institut Pasteur de la Guyane, Cayenne, French Guiana, France. .,Direction Interarmées du Service de Santé en Guyane, Cayenne, French Guiana, France. .,Institut de Recherche Biomédicale des Armées, Brétigny sur Orge, France.
| | - Benoit Witkowski
- Malaria Molecular Epidemiology Unit, Institut Pasteur du Cambodge, Phnom Penh, Cambodia.
| | - Didier Ménard
- Malaria Molecular Epidemiology Unit, Institut Pasteur du Cambodge, Phnom Penh, Cambodia.
| | | | - Eric Legrand
- Laboratoire de Parasitologie, Institut Pasteur de la Guyane, Cayenne, French Guiana, France.
| | - Christophe Duplais
- Laboratoire ECOFOG (Ecology of Guiana Forests) UMR8172 CNRS-INRA-CIRAD-AgroParisTech-Université des Antilles-Université de la Guyane, French Guiana, France.
| | - Jean Popovici
- Laboratoire de Parasitologie, Institut Pasteur de la Guyane, Cayenne, French Guiana, France. .,Malaria Molecular Epidemiology Unit, Institut Pasteur du Cambodge, Phnom Penh, Cambodia.
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Berthelot K, Lecomte S, Estevez Y, Peruch F. Hevea brasiliensis REF (Hev b 1) and SRPP (Hev b 3): An overview on rubber particle proteins. Biochimie 2014; 106:1-9. [DOI: 10.1016/j.biochi.2014.07.002] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Accepted: 07/05/2014] [Indexed: 11/28/2022]
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Berthelot K, Lecomte S, Estevez Y, Zhendre V, Henry S, Thévenot J, Dufourc EJ, Alves ID, Peruch F. Rubber particle proteins, HbREF and HbSRPP, show different interactions with model membranes. Biochimica et Biophysica Acta (BBA) - Biomembranes 2014; 1838:287-99. [DOI: 10.1016/j.bbamem.2013.08.025] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Revised: 08/27/2013] [Accepted: 08/31/2013] [Indexed: 01/31/2023]
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Berthelot K, Lecomte S, Estevez Y, Coulary-Salin B, Bentaleb A, Cullin C, Deffieux A, Peruch F. Rubber elongation factor (REF), a major allergen component in Hevea brasiliensis latex has amyloid properties. PLoS One 2012; 7:e48065. [PMID: 23133547 PMCID: PMC3485013 DOI: 10.1371/journal.pone.0048065] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [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: 07/27/2012] [Accepted: 09/19/2012] [Indexed: 12/26/2022] Open
Abstract
REF (Hevb1) and SRPP (Hevb3) are two major components of Hevea brasiliensis latex, well known for their allergenic properties. They are obviously taking part in the biosynthesis of natural rubber, but their exact function is still unclear. They could be involved in defense/stress mechanisms after tapping or directly acting on the isoprenoid biosynthetic pathway. The structure of these two proteins is still not described. In this work, it was discovered that REF has amyloid properties, contrary to SRPP. We investigated their structure by CD, TEM, ATR-FTIR and WAXS and neatly showed the presence of β-sheet organized aggregates for REF, whereas SRPP mainly fold as a helical protein. Both proteins are highly hydrophobic but differ in their interaction with lipid monolayers used to mimic the monomembrane surrounding the rubber particles. Ellipsometry experiments showed that REF seems to penetrate deeply into the monolayer and SRPP only binds to the lipid surface. These results could therefore clarify the role of these two paralogous proteins in latex production, either in the coagulation of natural rubber or in stress-related responses. To our knowledge, this is the first report of an amyloid formed from a plant protein. This suggests also the presence of functional amyloid in the plant kingdom.
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11
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Berthelot K, Estevez Y, Deffieux A, Peruch F. Isopentenyl diphosphate isomerase: A checkpoint to isoprenoid biosynthesis. Biochimie 2012; 94:1621-34. [DOI: 10.1016/j.biochi.2012.03.021] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Accepted: 03/27/2012] [Indexed: 11/25/2022]
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12
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Cabanillas BJ, Le Lamer AC, Castillo D, Arevalo J, Estevez Y, Rojas R, Valadeau C, Bourdy G, Sauvain M, Fabre N. Dihydrochalcones and benzoic acid derivatives from Piper dennisii. Planta Med 2012; 78:914-918. [PMID: 22516933 DOI: 10.1055/s-0031-1298459] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [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
Two new dihydrochalcones (1, 2), as well as eight known compounds, piperaduncin C (3), 2',6'-dihydroxy-4'-methoxydihydrochalcone (4), 4,2',6'-trihydroxy-4'-methoxydihydrochalcone (5), 4-hydroxy-3,5-bis(3-methyl-2-butenyl)-benzoic acid (6), 3,5-bis(3-methyl-2-butenyl)-4-methoxybenzoic acid (7), 4-hydroxy-3-(3-methyl-2-butenoyl)-5-(3-methyl-2-butenyl)-benzoic acid (8), 2,2-dimethyl-8-(3-methyl-2-butenyl)-2H-1-chromene-6-carboxylic acid (9), and 3-(3',7'-dimethyl-2',6'-octadienyl)-4-methoxybenzoic acid (10) were isolated from the leaves of Piper dennisii Trelease (Piperaceae), using a bioassay-guided fractionation to determine their antileishmanial potential. Among them, compound 10 exhibited the best antileishmanial activity (IC50 = 20.8 µM) against axenic amastigote forms of Leishmania amazonensis, with low cytotoxicity on murine macrophages. In the intracellular macrophage-infected model, compound 10 proved to be more active (IC50 = 4.2 µM). The chemical structures of compounds 1-10 were established based on the analysis of the spectroscopic data.
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Affiliation(s)
- Billy Joel Cabanillas
- Université de Toulouse, UPS, UMR 152 (Pharmacochimie et Pharmacologie pour le Développement-PHARMA DEV), Toulouse, France
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13
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Estevez Y, Quiliano M, Burguete A, Cabanillas B, Zimic M, Málaga E, Verástegui M, Pérez-Silanes S, Aldana I, Monge A, Castillo D, Deharo E. Trypanocidal properties, structure-activity relationship and computational studies of quinoxaline 1,4-di-N-oxide derivatives. Exp Parasitol 2011; 127:745-51. [PMID: 21272583 DOI: 10.1016/j.exppara.2011.01.009] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2010] [Revised: 11/19/2010] [Accepted: 01/18/2011] [Indexed: 11/20/2022]
Abstract
Pyrazole and propenone quinoxaline derivatives were tested against intracellular forms of Leishmania peruviana and Trypanosoma cruzi. Both series were tested for toxicity against proliferative and non-proliferative cells. The pyrazole quinoxaline series was quite inactive against T. cruzi; however, the compound 2,6-dimethyl-3-f-quinoxaline 1,4-dioxide was found to inhibit 50% of Leishmania growth at 8.9 μM, with no impact against proliferative kidney cells and with low toxicity against THP-1 cells and murine macrophages. The compounds belonging to the propenone quinoxaline series were moderately active against T. cruzi. Among these compounds, two were particularly interesting, (2E)-1-(7-fluoro-3-methyl-quinoxalin-2-yl)-3-(3,4,5-trimethoxy-phenyl)-propenone and (2E)-3-(3,4,5-trimethoxy-phenyl)-1-(3,6,7-trimethyl-quinoxalin-2-yl)-propenone. The former possessed selective activity against proliferative cells (cancer and parasites) and was inactive against murine peritoneal macrophages; the latter was active against Leishmania and inactive against the other tested cells. Furthermore, insilico studies showed that both series respected Lipinski's rules and that they confirmed a linear correlation between trypanocidal activities and LogP. Docking studies revealed that compounds of the second series could interact with the poly (ADP-ribose) polymerase protein of Trypanosoma cruzi.
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Affiliation(s)
- Yannick Estevez
- Université de Toulouse, UPS, UMR 152 (Laboratoire de pharmacochimie des substances naturelles et pharmacophores redox), 118, rte de Narbonne, F-31062 Toulouse cedex 9, France
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14
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Aponte JC, Vaisberg AJ, Castillo D, Gonzalez G, Estevez Y, Arevalo J, Quiliano M, Zimic M, Verástegui M, Málaga E, Gilman RH, Bustamante JM, Tarleton RL, Wang Y, Franzblau SG, Pauli GF, Sauvain M, Hammond GB. Trypanoside, anti-tuberculosis, leishmanicidal, and cytotoxic activities of tetrahydrobenzothienopyrimidines. Bioorg Med Chem 2010; 18:2880-6. [PMID: 20356752 DOI: 10.1016/j.bmc.2010.03.018] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2009] [Revised: 03/08/2010] [Accepted: 03/09/2010] [Indexed: 01/01/2023]
Abstract
The synthesis of 2-(5,6,7,8-tetrahydro[1]benzothieno[2,3-d]pyrimidin-4-yl)hydrazone-derivatives (BTPs) and their in vitro evaluation against Trypanosoma cruzi trypomastigotes, Mycobacterium tuberculosis, Leishmania amazonensis axenic amastigotes, and six human cancer cell lines is described. The in vivo activity of the most active and least toxic compounds against T. cruzi and L. amazonensis was also studied. BTPs constitute a new family of drug leads with potential activity against infectious diseases. Due to their drug-like properties, this series of compounds can potentially serve as templates for future drug-optimization and drug-development efforts for use as therapeutic agents in developing countries.
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Affiliation(s)
- José C Aponte
- Department of Chemistry, University of Louisville, Louisville, KY 40292, USA
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15
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Acebey L, Jullian V, Sereno D, Chevalley S, Estevez Y, Moulis C, Beck S, Valentin A, Gimenez A, Sauvain M. Anti-leishmanial lindenane sesquiterpenes from Hedyosmum angustifolium. Planta Med 2010; 76:365-368. [PMID: 19830657 DOI: 10.1055/s-0029-1186192] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The aim of this work is the isolation of anti-leishmanial compounds from the ethyl acetate extracts of the bark of HEDYOSMUM ANGUSTIFOLIUM. We have successfully isolated and characterized five sesquiterpenes: one new compound (oxyonoseriolide, 1), one compound isolated for the first time from a natural source (hedyosmone, 2), and three known sesquiterpenes (onoseriolide, 3; chloranthalactone A, 4; and spathulenol, 5) that had not been previously isolated from H. ANGUSTIFOLIUM. The biological activities of 1- 5 showed that onoseriolide ( 3) was the most active compound against axenic amastigotes from LEISHMANIA AMAZONENSIS and L. INFANTUM. Moreover, it was still active on the intramacrophagic amastigotes of L. INFANTUM. The isolated compounds have also been tested on PLASMODIUM FALCIPARUM and against various mammalian cell lines.
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16
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Aponte JC, Castillo D, Estevez Y, Gonzalez G, Arevalo J, Hammond GB, Sauvain M. In vitro and in vivo anti-Leishmania activity of polysubstituted synthetic chalcones. Bioorg Med Chem Lett 2009; 20:100-3. [PMID: 19962891 DOI: 10.1016/j.bmcl.2009.11.033] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2009] [Revised: 11/09/2009] [Accepted: 11/09/2009] [Indexed: 10/20/2022]
Abstract
The in vitro screening of 43 polysubstituted chalcones against Leishmania amazonensis axenic amastigotes, led to the evaluation of 9 of them in a macrophage-infected model with the two other most infectious Leishmania species prevalent in Peru (L. braziliensis and L. peruviana). The five most active and selective chalcones were studied in vivo, resulting on the identification of two chalcones with high reduction parasite burden percentages.
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Affiliation(s)
- José C Aponte
- Department of Chemistry, University of Louisville, KY 40292, USA
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17
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Odonne G, Bourdy G, Castillo D, Estevez Y, Lancha-Tangoa A, Alban-Castillo J, Deharo E, Rojas R, Stien D, Sauvain M. Ta'ta', Huayani: perception of leishmaniasis and evaluation of medicinal plants used by the Chayahuita in Peru. Part II. J Ethnopharmacol 2009; 126:149-58. [PMID: 19631728 DOI: 10.1016/j.jep.2009.07.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2009] [Revised: 06/10/2009] [Accepted: 07/12/2009] [Indexed: 05/16/2023]
Abstract
AIM OF THE STUDY A knowledge attitude and practice study centred on leishmaniasis and its treatment was performed among the Chayahuita, an Amazonian Peruvian ethnic group living in an endemic area. This study documents traditional Chayahuita plant's use and disease concepts. Also, activity of some medicinal plants used by the Chayahuita is highlighted and discussed. MATERIALS AND METHODS Ninety-three Chayahuita people were interviewed, following a semi-structured questionnaire focussed on disease knowledge and perception, personal attitude and healing practices. Simultaneously, a collection of plants was performed in different ecotopes, in order to make an extensive inventory of the pharmacopoeia. RESULTS For the Chayahuita, cutaneous (CL) and muco-cutaneous leishmaniasis (MCL) are considered as diseases of their own, with specific names, aetiologies, mode of transmission. Regarding CL, Chayahuita people consider that the humid characteristic of the skin ulcer is a discriminative fact orienting the diagnostic forTa'ta' (leishmaniasis). Forty-six different species were designated useful against LC and /or MCL (29 species by means of the questionnaire and 27 species when collecting in different ecotopes). Thirty-seven extracts corresponding to 31 species used medicinally were screened in vitro against Leishmania amazonensis axenic amastigotes, assessing their viability by the reduction of tetrazolium salt (MTT). Six species displayed a good activity (10 microg/ml<IC50<20 microg/ml): an undetermined hemi-epiphytic Clusiaceae, Cybianthus anthuriophyllus Pipoly (Myrsinaceae), two Piper, Piper sanguineispicum Trel., and Piper loretoanum Trel. (Piperaceae), Desmodium axillare Sw. DC. (Fabaceae), and Clibadium sylvestre (Aubl.) Baill. (Asteraceae). CONCLUSION Perception of leishmaniasis, attitude, treatments and diet prohibitions still largely reflects traditional Chayahuita cosmovision, even if some tentative of bio-medical re-interpretation is arising.
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Affiliation(s)
- G Odonne
- UMR EcoFoG, Université des Antilles et de la Guyane - CNRS, 2091 Route de Baduel - BP792, 97337, Cayenne Cedex, France
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18
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Valadeau C, Pabon A, Deharo E, Albán-Castillo J, Estevez Y, Lores FA, Rojas R, Gamboa D, Sauvain M, Castillo D, Bourdy G. Medicinal plants from the Yanesha (Peru): evaluation of the leishmanicidal and antimalarial activity of selected extracts. J Ethnopharmacol 2009; 123:413-22. [PMID: 19514108 DOI: 10.1016/j.jep.2009.03.041] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
AIM OF THE STUDY Ninety-four ethanolic extracts of plants used medicinally by the Yanesha, an Amazonian Peruvian ethnic group, for affections related to leishmaniasis and malaria were screened in vitro against Leishmania amazonensis amastigotes and against a Plasmodium falciparum chloroquine resistant strain. MATERIALS AND METHODS The viability of Leishmania amazonensis amastigote stages was assessed by the reduction of tetrazolium salt (MTT) while the impact on Plasmodium falciparum was determined by measuring the incorporation of radio-labelled hypoxanthine. RESULTS AND CONCLUSIONS Six plant species displayed good activity against Plasmodium falciparum chloroquine resistant strain (IC(50) < 10 microg/ml): a Monimiaceae, Siparuna aspera (Ruiz & Pavon), A. DC., two Zingiberaceae, Renealmia thyrsoidea (Ruiz & Pavon) Poepp. & Endl. and Renealmia alpinia (Rottb.), two Piperaceae (Piper aduncum L. and Piper sp.) and the leaves of Jacaranda copaia (Aubl.) D. Don (Bignoniaceae). Eight species displayed interesting leishmanicidal activities (IC50 < 10 microg/ml): Carica papaya L. (Caricaceae), Piper dennisii Trel (Piperaceae), Hedychium coronarium J. König (Zingiberaceae), Cestrum racemosum Ruiz & Pav. (Solanaceae), Renealmia alpinia (Rottb.) Zingiberaceae, Lantana sp. (Verbenaceae), Hyptis lacustris A. St.-Hil. ex Benth. (Lamiaceae) and Calea montana Klat. (Asteraceae). Most of them are used against skin affections by Yanesha people. Results are discussed herein, according to the traditional use of the plants and compared with data obtained from the literature.
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19
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Burguete A, Estevez Y, Castillo D, González G, Villar R, Solano B, Vicente E, Silanes SP, Aldana I, Monge A, Sauvain M, Deharo E. Anti-leishmanial and structure-activity relationship of ring substituted 3-phenyl-1-(1,4-di-N-oxide quinoxalin-2-yl)-2-propen-1-one derivatives. Mem Inst Oswaldo Cruz 2009; 103:778-80. [PMID: 19148416 DOI: 10.1590/s0074-02762008000800006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2008] [Accepted: 10/31/2008] [Indexed: 11/22/2022] Open
Abstract
A series of ring substituted 3-phenyl-1-(1,4-di-N-oxide quinoxalin-2-yl)-2-propen-1-one derivatives were synthesized and tested for in vitro leishmanicidal activity against amastigotes of Leishmania amazonensis in axenical cultures and murine infected macrophages. Structure-activity relationships demonstrated the importance of a radical methoxy at position R3', R4' and R5'. (2E)-3-(3,4,5-trimethoxy-phenyl)-1-(3,6,7-trimethyl-1,4-dioxy-quinoxalin-2-yl)-propenone was the most active. Cytotoxicity on macrophages revealed that this product was almost six times more active than toxic.
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Affiliation(s)
- Asunción Burguete
- Unidad de Investigación y Desarrollo de Medicamentos, Centro de Investigación en Farmacobiología Aplicada, University of Navarra, Campus Universitario, Pamplona, Spain
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20
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Aponte JC, Estevez Y, Gilman RH, Lewis WH, Rojas R, Sauvain M, Vaisberg AJ, Hammond GB. Anti-infective and cytotoxic compounds present in Blepharodon nitidum. Planta Med 2008; 74:407-410. [PMID: 18484532 DOI: 10.1055/s-2008-1034330] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A pharmacological screening of the ethanol extract and fractions of Blepharodon nitidum led to the isolation of fourteen compounds, two of which, 24-hydroperoxycycloart-25-en-3beta-ol and 25-hydroperoxycycloart-23-en-3beta-ol, exhibited in vitro anti- Mycobacterium tuberculosis and antileishmanial activities, as well as significant cytotoxic activity against a panel of human tumor cell lines.
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Affiliation(s)
- José C Aponte
- Department of Chemistry, University of Louisville, Louisville, KY, U.S.A
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21
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Estevez Y, Castillo D, Pisango MT, Arevalo J, Rojas R, Alban J, Deharo E, Bourdy G, Sauvain M. Evaluation of the leishmanicidal activity of plants used by Peruvian Chayahuita ethnic group. J Ethnopharmacol 2007; 114:254-9. [PMID: 17889471 DOI: 10.1016/j.jep.2007.08.007] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2007] [Revised: 08/02/2007] [Accepted: 08/03/2007] [Indexed: 05/17/2023]
Abstract
AIM OF THE STUDY A total of 27 ethanolic plant extracts from 27 species were screened for leishmanicidal activity in vitro against Leishmania amazonensis. Most of the selected species (19) are traditionally used by the Chayahuitas, an Amazonian Peruvian ethnic group, to treat skin affections and/or leishmaniasis. MATERIAL AND METHODS A colorimetric method based on the reduction of tetrazolium salt (MTT) was used to measure the viability of Leishmania amazonensis promastigote and amastigote stages. RESULTS AND CONCLUSIONS Only the leaves of two species of the Piperaceae family (Piper hispidum Sw., and Piper strigosum Trel.) showed good leishmanicidal activities (IC(50)<10 microg/ml against amastigotes). Roots of Tabernaemontana sananho Ruiz & Pav. (Apocynaceae), together with bark of Vismia tomentosa Ruiz & Pav. (Clusiaceae), fruits of Solanum straminifolium var straminifolium Jacq. (Solanaceae), and stems of Zamia lindenii Regel ex André (Cycadaceae) showed low activity against amastigote stage (IC(50) around 50 microg/ml). Of those only Tabernaemontana sananho displayed also good activity on promastigotes (IC(50)<10 microg/ml). Results are discussed herein, in relation with the traditional use of the plants and compared with other data from the relevant literature.
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Affiliation(s)
- Y Estevez
- UMR 152 IRD-Université de Toulouse III, Mission IRD, Casilla 18, 1209 Lima 18, Peru
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Michon T, Estevez Y, Walter J, German-Retana S, Le Gall O. The potyviral virus genome-linked protein VPg forms a ternary complex with the eukaryotic initiation factors eIF4E and eIF4G and reduces eIF4E affinity for a mRNA cap analogue. FEBS J 2006; 273:1312-22. [PMID: 16519694 DOI: 10.1111/j.1742-4658.2006.05156.x] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The virus protein linked to the genome (VPg) of plant potyviruses is a 25-kDa protein covalently attached to the genomic RNA 5' end. It was previously reported that VPg binds specifically to eIF4E, the mRNAcap-binding protein of the eukaryotic translation initiation complex. We performed a spectroscopic study of the interactions between lettuce eIF4E and VPg from lettuce mosaic virus (LMV). The cap analogue m7GDP and VPg bind to eIF4E at two distinct sites with similar affinity (K(d) = 0.3 microm). A deeper examination of the interaction pathway showed that the binding of one ligand induces a decrease in the affinity for the other by a factor of 15. GST pull-down experiments from plant extracts revealed that VPg can specifically trap eIF4G, the central component of the complex required for the initiation of protein translation. Our data suggest that eIF4G recruitment by VPg is indirectly mediated through VPg-eIF4E association. The strength of interaction between eIF4E and pep4G, the eIF4E-binding domain on eIF4G, was increased significantly by VPg. Taken together these quantitative data show that VPg is an efficient modulator of eIF4E biochemical functions.
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Affiliation(s)
- Thierry Michon
- Interactions Plante-Virus, UMR GDPP INRA-Bordeaux 2, Institut de Biologie Végétale Moléculaire, Villenave d'Ornon, France.
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