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<dc:title xml:lang="fr">Ischémie critique chronique des membres inférieurs : implication mitochondriale chez l'Homme et mise au point d'un modèle murin permettant l'évaluation de conditionnements pharmacologiques</dc:title>
<dcterms:alternative xml:lang="en">Critical limb ischemia : mitochondrial participation in human and assessment of a murine model testing pharmacological conditioning</dcterms:alternative>
<dc:subject xml:lang="fr">Ischémie critique chronique</dc:subject>
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<dc:subject xml:lang="fr">Stress oxydant</dc:subject>
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<dc:subject xml:lang="en">Critical limb ischemia</dc:subject>
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<dcterms:abstract xml:lang="fr">L’ischémie critique chronique définit un stade avancé d’insuffisance artérielle chronique. Le diagnostic d’ischémie critique chronique nécessite trois éléments : des signes cliniques, des mesures de perfusion artérielle témoignant de l’ischémie, ainsi qu’une durée des symptômes supérieure à 15 jours. Nous avons mis au point un modèle d’ischémie critique chronique valide chez la souris, et reproduisant au plus proche les lésions observées chez l’homme, en réalisant une ligature fémorale droite associée à une ligature iliaque droite 4 jours plus tard. Nous avons ensuite étudié à partir de ce modèle l’atteinte mitochondriale liée à l’ischémie critique chronique, notamment l’altération de la fonction respiratoire mitochondriale, la diminution de la capacité de rétention calcique, et la production de radicaux libres. Nous avons testé différents protocoles de conditionnement pharmacologique et avons mis en évidence un effet protecteur de la N acétyl cystéine, des statines et de la L arginine. Les voies de protection RISK et SAFE seraient potentiellement impliquées dans cet effet protecteur.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Critical limb ischemia defines an advances stage of peripheral arterial disease and peripheral arterial insufficiency. The diagnosis of critical limb ischemia requires three elements: clinical signs, arterial perfusion measures demonstrating the level of ischemia, as well as a duration of symptoms for more than 15 days. We developed a critical limb ischemia model in mice, nearly mimicking human pathology, by right femoral artery ligatuon followed by right artery ligation 4 days later. We then studied from this model the mitochondrial impairment associted with critical limb ischemia, including impaired mitochondrial respiratory function, reduced calcium retention capacity, and increased production of free radicals. Once these changes highlighted, we wanted to test different pharmacological conditioning, in order to identify protective molecules in critical limb ischemia. We thus demonstrated a protective effetct of N acetyl cysteine, statins and L-arginine. The protection pathways RISK and SAFE may be involved in this protective effect.</dcterms:abstract>
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