Consulta: creatorFacets:"Portela, Julien"
Registros recuperados: 5
Data/hora: 08/06/2024 19:14:33

A Novel Bacterial Pathogen of Biomphalaria glabrata: A Potential Weapon for Schistosomiasis Control?
Provedor de dados: 5
Autores: Duval, David; Galinier, Richard; Mouahid, Gabriel; Toulza, Eve; Allienne, Jean Francois; Portela, Julien; Calvayrac, Christophe; Rognon, Anne; Arancibia, Nathalie; Mitta, Guillaume; Theron, Andre; Gourbal, Benjamin.
Background Schistosomiasis is the second-most widespread tropical parasitic disease after malaria. Various research strategies and treatment programs for achieving the objective of eradicating schistosomiasis within a decade have been recommended and supported by the World Health Organization. One of these approaches is based on the control of snail vectors in endemic areas. Previous field studies have shown that competitor or predator introduction can reduce snail numbers, but no systematic investigation has ever been conducted to identify snail microbial pathogens and evaluate their molluscicidal effects. Methodology/Principal findings In populations of Biomphalaria glabrata snails experiencing high mortalities, white nodules were visible on snail...
Tipo: Text
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00615/72716/71712.pdf

BgTEP: An Antiprotease Involved in Innate Immune Sensing in Biomphalaria glabrata
Provedor de dados: 5
Autores: Portet, Anais; Galinier, Richard; Pinaud, Silvain; Portela, Julien; Nowacki, Fanny; Gourbal, Benjamin; Duval, David.
Insect thioester-containing protein (iTEP) is the most recently defined group among the thioester-containing protein (TEP) superfamily. TEPs are key components of the immune system, and iTEPs from flies and mosquitoes were shown to be major immune weapons. Initially characterized from insects, TEP genes homologous to iTEP were further described from several other invertebrates including arthropods, cniderians, and mollusks albeit with few functional characterizations. In the freshwater snail Biomphalaria glabrata, a vector of the schistosomiasis disease, the presence of a TEP protein (BgTEP) was previously described in a well-defined immune complex involving snail lectins (fibrinogen-related proteins) and schistosome parasite mucins (SmPoMuc). To...
Tipo: Text
Palavras-chave: Thioester-containing protein; Complement-like protein; Biomphalaria glabrata; Interaction host/pathogens; Innate immunity.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00444/55548/71780.tif

Sympatric versus allopatric evolutionary contexts shape differential immune response in Biomphalaria / Schistosoma interaction
Provedor de dados: 5
Autores: Portet, Anais; Pinaud, Silvain; Chaparro, Cristian; Galinier, Richard; Dheilly, Nolwenn M.; Portela, Julien; Charriere, Guillaume; Allienne, Jean-francois; Duval, David; Gourbal, Benjamin.
Selective pressures between hosts and their parasites can result in reciprocal evolution or adaptation of specific life history traits. Local adaptation of resident hosts and parasites should lead to increase parasite infectivity/virulence (higher compatibility) when infecting hosts from the same location (in sympatry) than from a foreign location (in allopatry). Analysis of geographic variations in compatibility phenotypes is the most common proxy used to infer local adaptation. However, in some cases, allopatric host-parasite systems demonstrate similar or greater compatibility than in sympatry. In such cases, the potential for local adaptation remains unclear. Here, we study the interaction between Schistosoma and its vector snail Biomphalaria in which...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00488/59982/63214.pdf

A Shift from Cellular to Humoral Responses Contributes to Innate Immune Memory in the Vector Snail Biomphalaria glabrata
Provedor de dados: 5
Autores: Pinaud, Silvain; Portela, Julien; Duval, David; Nowacki, Fanny C.; Olive, Marie-aude; Allienne, Jean-francois; Galinier, Richard; Dheilly, Nolwenn M.; Kieffer-jaquinod, Sylvie; Mitta, Guillaume; Theron, Andre; Gourbal, Benjamin.
Discoveries made over the past ten years have provided evidence that invertebrate antiparasitic responses may be primed in a sustainable manner, leading to the failure of a secondary encounter with the same pathogen. This phenomenon called "immune priming" or "innate immune memory" was mainly phenomenological. The demonstration of this process remains to be obtained and the underlying mechanisms remain to be discovered and exhaustively tested with rigorous functional and molecular methods, to eliminate all alternative explanations. In order to achieve this ambitious aim, the present study focuses on the Lophotrochozoan snail, Biomphalaria glabrata, in which innate immune memory was recently reported. We provide herein the first evidence that a shift from a...
Tipo: Text
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00315/42664/71872.pdf

Alkoxyamines Designed as Potential Drugs against Plasmodium and Schistosoma Parasites
Provedor de dados: 5
Autores: Reyser, Thibaud; To, Tung H.; Egwu, Chinedu; Paloque, Lucie; Nguyen, Michel; Hamouy, Alexandre; Stigliani, Jean-luc; Bijani, Christian; Augereau, Jean-michel; Joly, Jean-patrick; Portela, Julien; Havot, Jeffrey; Marque, Sylvain R. A.; Boissier, Jérôme; Robert, Anne; Benoit-vical, Françoise; Audran, Gérard.
Malaria and schistosomiasis are major infectious causes of morbidity and mortality in the tropical and sub-tropical areas. Due to the widespread drug resistance of the parasites, the availability of new efficient and affordable drugs for these endemic pathologies is now a critical public health issue. In this study, we report the design, the synthesis and the preliminary biological evaluation of a series of alkoxyamine derivatives as potential drugs against Plasmodium and Schistosoma parasites. The compounds (RS/SR)-2F, (RR/SS)-2F, and 8F, having IC50 values in nanomolar range against drug-resistant P. falciparum strains, but also five other alkoxyamines, inducing the death of all adult worms of S. mansoni in only 1 h, can be considered as interesting...
Tipo: Text
Palavras-chave: Alkoxyamine; Alkylation; Heme; Malaria; Radical chemistry; Schistosomiasis.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00648/76024/76920.pdf