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<dc:title xml:lang="fr">La leucocidine de Panton-Valentine initie une forme alternative de NETose qui passe par la voie mitochondriale</dc:title>
<dcterms:alternative xml:lang="en">Staphylococcus aureus Panton-Valentine leukocidin triggers an alternative NETosis process targeting mitochondria</dcterms:alternative>
<dc:subject xml:lang="fr">Leucocidine de Panton et Valentine</dc:subject>
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<dc:subject xml:lang="en">Panton-Valentine Leucocidine</dc:subject>
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<tef:elementdEntree autoriteExterne="241145740" autoriteSource="Sudoc">Leucocidine de Panton-Valentine</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Staphylococcus aureus (SA) est une bactérie commensale, mais aussi un pathogène agressif pouvant sécréter nombreux facteurs de virulence, dont la Leucocidine de Panton et Valentine (LPV). La LPV est une leucotoxine bipartite appartenant à la famille des « toxines formant des pores » qui représente un facteur de gravité dans les infections. Cependant, plus récemment la formation d’un pore à la membrane plasmique a été démenti, alors que l’endocytose de la LPV dans les neutrophiles humains est suivie par une tardive perméabilisation membranaire. Ce phénomène représente une forme non classique de Neutrophil Extracellular Trap ou NETose, dépendant de la production de dérivés réactifs de l’oxygène mitochondriaux. Si un pore est présent, il est vraisemblablement formé à la mitochondrie, en raison d’une partielle colocalisation entre la LPV et cette organelle. La NETose à LPV serait alors plutôt une stratégie bactérienne pour se débarrasser de l’immunité de l’hôte et ainsi permettre la dissémination de SA.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Staphylococcus aureus (SA) is a commensal bacterium, but also an aggressive pathogen that can secrete many virulence factors, including Panton and Valentine Leucocidine (PVL). PVL is a bipartite leukotoxin belonging to the "pore-forming toxin" family, involved in the increased severity of infections. However, more recently the formation of a pore at the plasma membrane has been refused, while the endocytosis of PVL in human neutrophils is followed by a late membrane permeabilization. In fact, a non-classic form of Neutrophil Extracellular Trap process or NETosis has been identified as the main PVL outcome, depending on the generation of mitochondrial reactive oxygen species. If a pore is present, it is likely formed at the mitochondria, as suggested by a partial colocation between PVL and this organelle. Therefore, the PVL NETosis could rather represent a bacterial strategy to get rid of host immunity in order to allow the following spreading of SA.</dcterms:abstract>
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