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Cecropins as a marker of Spodoptera frugiperda immunosuppression during entomopathogenic bacterial challenge ArchiMer
Duvic, B.; Jouan, V.; Essa, N.; Girard, P-a; Pages, S.; Khattar, Z. Abi; Volkoff, N-a; Givaudan, A.; Destoumieux-garzon, Delphine; Escoubas, Jean-michel.
An antimicrobial peptide (AMP) of the cecropin family was isolated by HPLC from plasma of the insect pest, Spodoptera frugiperda. Its molecular mass is 3910.9 Da as determined by mass spectrometry. Thanks to the EST database Spodobase, we were able to describe 13 cDNAs encoding six different cecropins which belong to the sub-families CecA, CecB, CecC and CecD. The purified peptide identified as CecB1 was chemically synthesized (syCecB1). It was shown to be active against Gram-positive and Gram-negative bacteria as well as fungi. Two closely related entomopathogenic bacteria, Xenorhabdus nematophila F1 and Xenorhabdus mauleonii VC01(T) showed different susceptibility to syCecB1. Indeed, X. nematophila was sensitive to syCecB1 whereas X. mauleonii had a...
Tipo: Text Palavras-chave: Humoral immunity; Innate immunity; Immunosuppression; Lepidopteran; Invertebrate.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00086/19728/17485.pdf
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Characterization of Xenorhabdus isolates from La Rioja ( Northern Spain) and virulence with and without their symbiotic entomopathogenic nematodes (Nematoda: Steinernematidae) Inra
Campos-Herrera, R.; Tailliez, P.; Pages, S.; Ginibre, N.; Gutiérrez, C.; Boemare, N..
Eighteen Xenorhabdus isolates associated with Spanish entomopathogenic nematodes of the genus Steinernema were characterized using a polyphasic approach including phenotypic and molecular methods. Two isolates were classified as Xenorhabdus nematophila and were associated with Steinernema carpocapsae. Sixteen isolates were classified as Xenorhabdus bovienii, of which fifteen were associated with Steinernema feltiae and one with Steinernema kraussei. Two X. bovienii Phase II were also isolated, one instable phase isolated from S. feltiae strain Rioja and one stable phase from S. feltiae strain BZ. Four representative bacterial isolates were chosen to study their pathogenicity against Spodoptera littoralis with and without the presence of their nematode...
Tipo: Journal Article Palavras-chave: ENTOMOPATHOGENIC BACTERIA AND NEMATODE; PATHOGENICITY; SPODOPTERA LITTORALIS; STEINERNEMA; XENORHABDUS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20108be8d96&uri=/notices/prodinra1/2010/10/
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Interspecific competition between entomopathogenic nematodes (Steinernema) is modified by their bacterial symbionts (Xenorhabdus) Inra
Sicard, M.; Hinsinger, J.; Le Brun, N.; Pages, S.; Boemare, N.; Moulia, C..
Background: Symbioses between invertebrates and prokaryotes are biological systems of particular interest in order to study the evolution of mutualism. The symbioses between the entomopathogenic nematodes Steinernema and their bacterial symbiont Xenorhabdus are very tractable model systems. Previous studies demonstrated (i) a highly specialized relationship between each strain of nematodes and its naturally associated bacterial strain and (ii) that mutualism plays a role in several important life history traits of each partner such as access to insect host resources, dispersal and protection against various biotic and abiotic factors. The goal of the present study was to address the question of the impact of Xenorhabdus symbionts on the progression and...
Tipo: Journal Article Palavras-chave: XENORHABDUS; STEINERNEMA; ENTOMOPATHOGENIC NEMATODE; HOST-SYMBIONT SPECIFICITY; MOLECULAR PHYLOGENY; SYMBIOSIS; DESCRIPTION.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200877ef46a8&uri=/notices/prodinra1/2010/10/
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Isolation and identification of entomopathogenic nematodes and their symbiotic bacteria from Herault and Gard (Southern France) Inra
Emelianoff, V.; Le Brun, N.; Pages, S.; Stock, P.; Tailliez, P.; Moulia, C.; Sicard, M..
Isolation and identification of native nematode-bacterial associations in the field are necessary for successful control of endemic pests in a particular location. No study has yet been undertaken to recover and identify EPN in metropolitan France. In the present paper, we provide results of a survey of EPN and their symbiotic bacteria conducted in Herault and Gard regions in Southern France. Molecular characterization of isolated nematodes depicted three different Steinernema species and one Heterorhabditis species, H. bacteriophora. Steinernema species recovered were identified as: S. feltiae and S. affine and an undescribed species. Xenorhabdus symbionts were identified as X. bovienii for both S. feltiae and S. affine. Phylogenetic analysis placed the...
Tipo: Journal Article Palavras-chave: ENTOMOPATHOGENIC NEMATODE; STEINERNEMA; HETEROHABDITIS; PHOTORHABDUS; XENORHABDUS; HOST-SYMBIONT SPECIFICITY; MOLECULAR PHYLOGENY; SYMBIOSIS.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20085b9dadd7&uri=/notices/prodinra1/2009/03/
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Les nématodes entomopathogènes : steinernematidae et heterorhabditidae Inra
Mauléon, H.; Boemare, N.; Denon, D.; Briand, S.; Pages, S..
Tipo: Book Palavras-chave: CARACTERISATION MORPHOLOGIQUE; CARACTERISATION MOLECULAIRE; BIOGEOGRAPHIE; CONSERVATION.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20087b7cb8cf&uri=/notices/prodinra1/2008/09/
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Manifold aspects of specificity in a nematode–bacterium mutualism Inra
Chapuis, E.; Emelianoff, V.; Paulmier, V.; Le Brun, N.; Pages, S.; Sicard, M.; Ferdy, J.B..
Coevolution in mutualistic symbiosis can yield, because the interacting partners share common interests, to coadaptation: hosts perform better when associated with symbionts of their own locality than with others coming from more distant places. However, as the two partners of a symbiosis might also experience conflicts over part of their life cycle, coadaptation might not occur for all life-history traits. We investigated this issue in symbiotic systems where nematodes (Steinernema) and bacteria (Xenorhabdus) reproduce in insects they have both contributed to kill. Newborn infective juveniles (IJs) that carry bacteria in their intestine then disperse from the insect cadaver in search of a new host to infect. We ran experiments where nematodes coinfect...
Tipo: Journal Article Palavras-chave: COADAPTATION; MUTUALISM; SPECIFICITY; STEINERNEMA; XENORHABDUS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011a41bb11e&uri=/notices/prodinra1/2011/05/
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Plastic architecture of bacterial genome revealed by comparative genomics of Photorhabdus variants Inra
Gaudriault, S.; Pages, S.; Lanois, A.; Laroui, C.; Teyssier, C.; Jumas-Bilak, E.; Givaudan, A..
Background: The phenotypic consequences of large genomic architecture modifications within a clonal bacterial population are rarely evaluated because of the difficulties associated with using molecular approaches in a mixed population. Bacterial variants frequently arise among Photorhabdus luminescens, a nematode-symbiotic and insect-pathogenic bacterium. We therefore studied genome plasticity within Photorhabdus variants.Results: We used a combination of macrorestriction and DNA microarray experiments to perform a comparative genomic study of different P. luminescens TT01 variants. Prolonged culturing of TT01 strain and a genomic variant, collected from the laboratory-maintained symbiotic nematode, generated bacterial lineages composed of primary and...
Tipo: Journal Article Palavras-chave: PHOTORHABDUS; NEMATODE-SYMBIOTIC; INSECT-PATHOGENIC BACTERIUM; BACTERIAL GENOME ARCHITECTURE; PHENOTYPIC VARIANT.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201041309cda&uri=/notices/prodinra1/2010/10/
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Stages of infection during the tripartite interaction between Xenorhabdus nematophila, its nematode vector, and insect hosts Inra
Sicard, M.; Brugirard-Ricaud, K.; Pages, S.; Lanois, A.; Boemare, N.; Brehélin, M.; Givaudan, A..
Bacteria of the genus Xenorhabdus are mutually associated with entomopathogenic nematodes of the genus Steinernema and are pathogenic to a broad spectrum of insects. The nematodes act as vectors, transmitting the bacteria to insect larvae, which die within a few days of infection. We characterized the early stages of bacterial infection in the insects by constructing a constitutive green fluorescent protein (GFP)-labeled Xenorhabdus nematophila strain. We injected the GFP-labeled bacteria into insects and monitored infection. We found that the bacteria had an extracellular life cycle in the hemolymph and rapidly colonized the anterior midgut region in Spodoptera littoralis larvae. Electron microscopy showed that the bacteria occupied the extracellular...
Tipo: Journal Article Palavras-chave: XENORHABDUS; ENTOMOPATHOGENIC NEMATODE; STEINERNEMA; GFP-LABELED; INTESTINAL VESICLE; SPODOPTERA.
Ano: 2004 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008345034c5&uri=/notices/prodinra1/2009/03/
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The cyclomodulin Cif of Photorhabdus luminescens inhibits insect cell proliferation and triggers host cell death by apoptosis Inra
Varela Chavez, C.; Jubelin, G.; Courties, G.; Gomard, A.; Ginibre, N.; Pages, S.; Taieb, F.; Girard, P.A.; Oswald, E.; Givaudan, A.; Zumbihl, R.; Escoubas, J.M..
Cycle inhibiting factors (Cif) constitute a broad family of cyclomodulins present in bacterial pathogens of invertebrates and mammals. Cif proteins are thought to be type III effectors capable of arresting the cell cycle at G2/M phase transition in human cell lines. We report here the first direct functional analysis of CifPl, from the entomopathogenic bacterium Photorhabdus luminescens, in its insect host. The cifPl gene was expressed in P. luminescens cultures in vitro. The resulting protein was released into the culture medium, unlike the well characterized type III effector LopT. During locust infection, cifPl was expressed in both the hemolymph and the hematopoietic organ, but was not essential for P. luminescens virulence. CifPl inhibited...
Tipo: Journal Article Palavras-chave: PHOTORHABDUS; APOPTOSIS; CYCLE INHIBITING FACTOR; CIF; TYPE III SECRETION SYSTEM.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20119b3aacae&uri=/notices/prodinra1/2011/05/
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The PhoP-PhoQ two-component regulatory system of Photorhabdus luminescens is essential for virulence in insects Inra
Derzelle, S.; Turlin, E.; Duchaud, E.; Pages, S.; Kunst, F.; Givaudan, A.; Danchin, A..
Photorhabdus luminescens is a symbiont of entomopathogenic nematodes. Analysis of the genome sequence of this organism revealed a homologue of PhoP-PhoQ, a two-component system associated with virulence in intracellular bacterial pathogens. This organism was shown to respond to the availability of environmental magnesium. A mutant with a knockout mutation in the regulatory component of this system (phoP) had no obvious growth defect. It was, however, more motile and more sensitive to antimicrobial peptides than its wild-type parent. Remarkably, the mutation eliminated virulence in an insect model. No insect mortality was observed after injection of a large number of the phoP bacteria, while very small amounts of parental cells killed insect larvae in less...
Tipo: Journal Article Palavras-chave: ENTOMOPATHOGENIC NEMATODE; GENOME SEQUENCE; BACTERIAL PATHOGENE; VIRULENCE; INSECT MODEL; MAGNESIUM.
Ano: 2004 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008acbe701f&uri=/notices/prodinra1/2009/03/
Registros recuperados: 10
Primeira ... 1 ... Última
 

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