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<dc:title xml:lang="fr">Shigella : régulation de l’expression des SPATEs dépendante de l’oxygène et étude de leur(s) fonction(s)</dc:title>
<dcterms:alternative xml:lang="en">Oxygen regulation of SPATEs expression and study of their function(s) in Shigella virulence</dcterms:alternative>
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<dcterms:abstract xml:lang="fr">Les shigelles sont des entérobactéries pathogènes à Gram négative. Elles ont développé des stratégies leur permettant de s’adapter aux changements de l’environnement rencontrés au cours de leur cycle de virulence. Les systèmes de sécrétion ont un rôle primordial à différentes étapes du processus infectieux. Shigella forme des foyers infectieux hypoxiques (Arena E.T., 2017). Or, dans ce microenvironnement hypoxique, le T3SS n’est pas actif (Marteyn B., 2010). A l’inverse, nous avons démontré que les SPATEs de Shigella (T5SS) sont sécrétées en conditions normoxique et anoxique. Ce résultat a confirmé que les SPATEs sont susceptibles d’être sécrétées au niveau des foyers infectieux. Cette découverte a permis l’initiation de la deuxième partie de ma thèse à savoir l’étude de la fonction des SPATEs, spécifiquement SepA, dans la virulence de Shigella : au cours de l’interaction de Shigella avec les cellules épithéliales ainsi qu’avec les neutrophiles recrutés au niveau des foyers infectieux hypoxiques.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Shigella are Gram-negative enteropathogens. Their virulence relies on the expression of various secretion systems, including T3SS and T5SSs. Shigella forms hypoxic foci of infection (Arena E.T., 2017). In this hypoxic microenvironment, Shigella T3SS is not active (Marteyn B., 2010). We demonstrated that SPATEs (T5SS) are secreted regardless of the oxygen level, suggesting that these virulence factors are released in hypoxic infectious foci. Based on this discovery, I investigated, in the second part of my thesis, on the role of SPATEs during the interaction between Shigella and epithelial cells or neutrophils, recruited at infectious sites.</dcterms:abstract>
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