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<dc:title xml:lang="fr">Rôle de la leucocidine de Panton-Valentine dans l'infection oculaire staphylococcique : étude des cibles cellulaires et des conséquences inflammatoires tissulaires rétiniennes sur des modèles d'endophtalmie in vivo et ex vivo chez le lapin</dc:title>
<dcterms:alternative xml:lang="en">Panton–Valentine leucocidin colocalized with retinal neurons cells and incited early retinal inflammation through rabbit endophthalmitis and retinal explant models</dcterms:alternative>
<dc:subject xml:lang="fr">Staphylococcus aureus</dc:subject>
<dc:subject xml:lang="fr">Leucocidine de Panton-Valentine</dc:subject>
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<dc:subject xml:lang="fr">Cellules ganglionnaires</dc:subject>
<dc:subject xml:lang="fr">Cellules de Müller</dc:subject>
<dc:subject xml:lang="fr">Microglie</dc:subject>
<dc:subject xml:lang="fr">Explant rétinien</dc:subject>
<dc:subject xml:lang="fr">Inflammation rétinienne</dc:subject>
<dc:subject xml:lang="en">Staphylococcus aureus</dc:subject>
<dc:subject xml:lang="en">Panton-Valentine leucocidin</dc:subject>
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<dc:subject xml:lang="en">Retinal ganglion cells</dc:subject>
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<dc:subject xml:lang="en">Microglial cell</dc:subject>
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<dcterms:abstract xml:lang="fr">Staphylococcus aureus est une bactérie responsable de nombreuses infections. Divers facteurs de virulence sont décrits comme ayant un rôle aggravant dans l’infection staphylococcique. La leucocidine de Panton-Valentine (LPV) en est un. Elle interagit par l’intermédiaire du récepteur de C5a (C5aR) avec les leucocytes et les cellules neuronales dans différents tissus, mais son action au niveau rétinien est méconnue. Nous avons recherché des cibles rétiniennes cellulaires de l’intoxination à la LPV et étudié ses conséquences cellulaires et inflammatoires précoces dans les tissus rétiniens. AINSI, deux modèles de lapins ont été créés : l'injection intravitréenne in vivo et les explants rétiniens ex vivo. Dans les deux modèles, les cellules ganglionnaires étaient les principales cibles cellulaires rétiniennes de la LPV et le seul type de neurones rétiniennes qui exprimait C5aR. Les cellules de Müller comme la microglie étaient activées. L’explant rétinien était facilement manipulé, ils peuvent servir à la recherche de la LPV sur la rétine. La LPV seule pourrait induire une inflammation rétinienne après avoir ciblé spécifiquement les cellules neuronales.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Staphylococcus aureus is responsible for many infections. It secretes various virulence factors aggravating the staphylococcal infections. Panton-Valentine leucocidin (PVL) is a virulent leukotoxin from S. aureus and presents active effects towards leukocytes and neuronal cells via the C5a receptor (C5aR). The effects of PVL on retina is little known. We explored PVL retinal cell target and early retinal inflammation and tried to find the processes of bacterial toxins aggravating bacterial endophthalmitis. We employed two different rabbit models to study the PVL effects on retina: intravitreal injection in vivo and retinal explant ex vivo. In the two models, retinal ganglion cells were the only retinal neurons which express C5aR and the major cell targets of PVL in retina. PVL induced retinal Müller and microglial cell activation. The retinal explants were easily manipulated and showed obvious cellular targets of PVL and glial cell activations, they can contribute to research the effects of PVL on retina in future. PVL alone without S. aureus could induce great retinal inflammation after targeting specifically retinal neurons.</dcterms:abstract>
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