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<dc:title xml:lang="en">Mitochondria, neurosteroids and biological rhythms : implications in health and disease states</dc:title>
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<dc:subject xml:lang="fr">Maladie d’Alzheimer</dc:subject>
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<dcterms:abstract xml:lang="fr">Les mitochondries jouent un rôle primordial dans la survie et la mort cellulaire car elles gouvernent à la fois le métabolisme énergétique et les voies apoptotiques. Un dysfonctionnement mitochondrial dans les neurones peut donc conduire à la neurodégénérescence ou à une neuropathologie. Notre objectif a été d'étudier la régulation de la fonction mitochondriale, en particulier la bioénergétique, pour contribuer à l'amélioration des connaissances actuelles sur les mitochondries. Nos résultats montrent que: i) les neurostéroïdes améliorent la bioénergétique mitochondriale en stimulant la respiration cellulaire en condition normale; ii) les neurostéroïdes réduisent les déficits bioénergétiques observés dans la maladie d'Alzheimer; iii) l'horloge circadienne développe une régulation réciproque avec la bioénergétique et la dynamique mitochondriales. Les résultats de cette thèse ouvrent des perspectives intéressantes pour l'élaboration de stratégies régulatrices de l'homéostasie métabolique chez le sujet sain et chez le patient atteint d'une pathologie due à un dysfonctionnement mitochondrial et/ou une altération des rythmes biologiques.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Mitochondria play a paramount role in cell survival and death because they are orchestrating both energy metabolism and apoptotic pathways, while impaired mitochondrial function leads inevitably to disease, especially neurodegeneration. The purpose of the present thesis was therefore to deepen our understanding of the regulation of mitochondrial function, with a focus on mitochondrial bioenergetics and dynamics. Our key findings were that: i) neurosteroids represent promising molecules which are able to increase mitochondrial bioenergetics via enhancement of mitochondrial respiration in healthy condition; ii) neurosteroids are able to alleviate Alzheimer’s disease-related bioenergetic deficits; iii) the circadian clock is able to regulate mitochondrial bioenergetics and dynamics, and vice versa. Collectively, our results contribute to a better understanding of how mitochondria function, and could have multiple implications with regard to the regulation of metabolic homeostasis in health and disease states associated with mitochondrial impairments and/or circadian disruption.</dcterms:abstract>
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