Intracellular survival, cytopathic effects and virulence of Vibrio tasmaniensis, a pathogen of Crassostrea gigas oyster
Vibrio strains belonging to the Splendidus Clade have been repeatedly found in juvenile diseased oysters affected by summer mortalities. V. tasmaniensis LGP32 is an intracellular pathogen of oyster hemocytes which has been reported to alter the oxidative burst and inhibit phagosome maturation. We sh...
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ftccsdartic:oai:HAL:tel-03858660v1 2024-02-27T08:39:53+00:00 Intracellular survival, cytopathic effects and virulence of Vibrio tasmaniensis, a pathogen of Crassostrea gigas oyster Survie intracellulaire, effets cytopathiques et virulence de Vibrio tasmaniensis LGP32, pathogène de l’huître Crassostrea gigas Vanhove, Audrey Ecologie des systèmes marins côtiers (Ecosym) Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS) Université Montpellier I Delphine Destoumieux-Garzón Estelle Bilak 2014-12-11 https://theses.hal.science/tel-03858660 https://theses.hal.science/tel-03858660/document https://theses.hal.science/tel-03858660/file/2014_VANHOVE_archivage.pdf fr fre HAL CCSD NNT: 2014MON13518 tel-03858660 https://theses.hal.science/tel-03858660 https://theses.hal.science/tel-03858660/document https://theses.hal.science/tel-03858660/file/2014_VANHOVE_archivage.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-03858660 Microbiologie et Parasitologie. Université Montpellier I, 2014. Français. ⟨NNT : 2014MON13518⟩ Host-Pathogen interaction Vibrio Infectious process Escape Innate immunity Interaction hôte-pathogène Processus infectieux Mécanismes d’échappement Immunité innée [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology info:eu-repo/semantics/doctoralThesis Theses 2014 ftccsdartic 2024-01-28T01:05:15Z Vibrio strains belonging to the Splendidus Clade have been repeatedly found in juvenile diseased oysters affected by summer mortalities. V. tasmaniensis LGP32 is an intracellular pathogen of oyster hemocytes which has been reported to alter the oxidative burst and inhibit phagosome maturation. We show here that LGP32 behaves as an intravacuolar pathogen that survives within large cytoplasmic vacuoles. LGP32 induces cytotoxic effects such as membrane disruptions and cytoplasmic disorders. Cytotoxicity was shown to be entirely dependent on LGP32 entry into hemocytes. Moreover, LGP32 releases outer membrane vesicles (OMVs) inside the phagosome. LGP32 OMVs were found to be protective against host defenses and to serve as vehicles for the delivery of LGP32 virulence factors to oyster immune cells. Indeed, OMVs conferred a high resistance to antimicrobial peptides. They also displayed a high content in hydrolases (25 % of total proteome) among which a serine protease, named Vsp for vesicular serine protease, was found to be specifically secreted through OMVs. Vsp was shown to participate in the virulence phenotype of LGP32 in oyster experimental infections but did not degrade AMPs entrapped in OMVs. By developing a transcriptomic approach, we identified a series of Vibrio antioxidant and copper efflux genes whose expression is strongly induced within oyster hemocytes. Construction of isogenic deletion mutants showed that resistance to reactive oxygen species and copper efflux are two important functions required for LGP32 intracellular survival, cytotoxic effects and virulence. Their high conservation among vibrios suggests they could contribute to intracellular survival of other Vibrio species. Des souches de Vibrio appartenant au clade Splendidus sont retrouvées de manière récurrente lors des mortalités estivales d'huîtres juvéniles. La souche V. tasmaniensis LGP32 est un pathogène intracellulaire facultatif des hémocytes d'huître, dont elle altère les fonctions de défense. Nous montrons ici que LGP32 se comporte ... Doctoral or Postdoctoral Thesis Crassostrea gigas Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
French |
topic |
Host-Pathogen interaction Vibrio Infectious process Escape Innate immunity Interaction hôte-pathogène Processus infectieux Mécanismes d’échappement Immunité innée [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology |
spellingShingle |
Host-Pathogen interaction Vibrio Infectious process Escape Innate immunity Interaction hôte-pathogène Processus infectieux Mécanismes d’échappement Immunité innée [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology Vanhove, Audrey Intracellular survival, cytopathic effects and virulence of Vibrio tasmaniensis, a pathogen of Crassostrea gigas oyster |
topic_facet |
Host-Pathogen interaction Vibrio Infectious process Escape Innate immunity Interaction hôte-pathogène Processus infectieux Mécanismes d’échappement Immunité innée [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology |
description |
Vibrio strains belonging to the Splendidus Clade have been repeatedly found in juvenile diseased oysters affected by summer mortalities. V. tasmaniensis LGP32 is an intracellular pathogen of oyster hemocytes which has been reported to alter the oxidative burst and inhibit phagosome maturation. We show here that LGP32 behaves as an intravacuolar pathogen that survives within large cytoplasmic vacuoles. LGP32 induces cytotoxic effects such as membrane disruptions and cytoplasmic disorders. Cytotoxicity was shown to be entirely dependent on LGP32 entry into hemocytes. Moreover, LGP32 releases outer membrane vesicles (OMVs) inside the phagosome. LGP32 OMVs were found to be protective against host defenses and to serve as vehicles for the delivery of LGP32 virulence factors to oyster immune cells. Indeed, OMVs conferred a high resistance to antimicrobial peptides. They also displayed a high content in hydrolases (25 % of total proteome) among which a serine protease, named Vsp for vesicular serine protease, was found to be specifically secreted through OMVs. Vsp was shown to participate in the virulence phenotype of LGP32 in oyster experimental infections but did not degrade AMPs entrapped in OMVs. By developing a transcriptomic approach, we identified a series of Vibrio antioxidant and copper efflux genes whose expression is strongly induced within oyster hemocytes. Construction of isogenic deletion mutants showed that resistance to reactive oxygen species and copper efflux are two important functions required for LGP32 intracellular survival, cytotoxic effects and virulence. Their high conservation among vibrios suggests they could contribute to intracellular survival of other Vibrio species. Des souches de Vibrio appartenant au clade Splendidus sont retrouvées de manière récurrente lors des mortalités estivales d'huîtres juvéniles. La souche V. tasmaniensis LGP32 est un pathogène intracellulaire facultatif des hémocytes d'huître, dont elle altère les fonctions de défense. Nous montrons ici que LGP32 se comporte ... |
author2 |
Ecologie des systèmes marins côtiers (Ecosym) Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS) Université Montpellier I Delphine Destoumieux-Garzón Estelle Bilak |
format |
Doctoral or Postdoctoral Thesis |
author |
Vanhove, Audrey |
author_facet |
Vanhove, Audrey |
author_sort |
Vanhove, Audrey |
title |
Intracellular survival, cytopathic effects and virulence of Vibrio tasmaniensis, a pathogen of Crassostrea gigas oyster |
title_short |
Intracellular survival, cytopathic effects and virulence of Vibrio tasmaniensis, a pathogen of Crassostrea gigas oyster |
title_full |
Intracellular survival, cytopathic effects and virulence of Vibrio tasmaniensis, a pathogen of Crassostrea gigas oyster |
title_fullStr |
Intracellular survival, cytopathic effects and virulence of Vibrio tasmaniensis, a pathogen of Crassostrea gigas oyster |
title_full_unstemmed |
Intracellular survival, cytopathic effects and virulence of Vibrio tasmaniensis, a pathogen of Crassostrea gigas oyster |
title_sort |
intracellular survival, cytopathic effects and virulence of vibrio tasmaniensis, a pathogen of crassostrea gigas oyster |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://theses.hal.science/tel-03858660 https://theses.hal.science/tel-03858660/document https://theses.hal.science/tel-03858660/file/2014_VANHOVE_archivage.pdf |
genre |
Crassostrea gigas |
genre_facet |
Crassostrea gigas |
op_source |
https://theses.hal.science/tel-03858660 Microbiologie et Parasitologie. Université Montpellier I, 2014. Français. ⟨NNT : 2014MON13518⟩ |
op_relation |
NNT: 2014MON13518 tel-03858660 https://theses.hal.science/tel-03858660 https://theses.hal.science/tel-03858660/document https://theses.hal.science/tel-03858660/file/2014_VANHOVE_archivage.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1792046961739694080 |