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<dc:title xml:lang="en">Role of PGC-1β and TIF2 co-regulators in mouse skeletal muscle function</dc:title>
<dcterms:alternative xml:lang="fr">Rôle des co-régulateurs PGC-1ß et TIF2 dans la fonction du muscle squelettique chez la souris</dcterms:alternative>
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<dc:subject xml:lang="fr">Mitochondries</dc:subject>
<dc:subject xml:lang="fr">Stress oxydatif</dc:subject>
<dc:subject xml:lang="fr">Muscle squelettique</dc:subject>
<dc:subject xml:lang="fr">Métabolisme</dc:subject>
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<dc:subject xml:lang="en">Transcriptional coregulators</dc:subject>
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<dcterms:abstract xml:lang="fr">Le muscle squelettique (MS) est un tissu métabolique important. L'objectif de ma thèse était de caractériser le rôle des corégulateurs de la transcription, PGC-1β (transcriptional coactivator peroxisome proliferator-activated receptor-gammacoactivator 1beta) et TIF2 (Transcriptional Intermediary Factor 2) dans ce tissu. Mon travail a démontré que PGC-1β limite le stress oxydatif est crucial dans le maintien de la structure et de la fonction mitochondriale, via le contrôle de l’expression de gènes impliqués dans les voies de signalisation liées à l’énergie, à la dynamique mitochondriale et à la machinerie d’import mais n'est pas indispensable pour le contenu mitochondrial. Mon travail aussi démontré que TIF2 de la MS a un impact négatif sur la durée de vie des mammifères. De plus, la déplétion de TIF2 conduit à une protection partielle du MS contre les dommages oxydatifs induits par le stress. Ainsi notre travail représente une avancée dans l’établissement futur de traitements contre les troubles liés au stress oxydatif et au vieillissement.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Skeletal muscle (SM) accounting for ~ 40% of total body mass is an important metabolic tissue. The aim of my thesis was to characterize the role of transcriptional coregulators, peroxisome proliferator-activated receptor-gamma coactivator-1β (PGC-1β) and transcriptional intermediary factor 2 (TIF2) in this tissue. My work demonstrated that PGC-1β is crucial to maintain SM mitochondrial structure and function, by controlling expression of genes involved in energy pathways, mitochondrial dynamics and import machinery, but is dispensable for mitochondrial content and fiber type maintenance. Furthermore, it limits oxidative stress. The second part of my work demonstrated that myofiber TIF2 has negative impact onmammalian life span. Moreover, TIF2 ablation leads to partial protection of SM from oxidative stress-induced damage. In conclusion, our work provides a better understanding of SM homeostasis regulation and insights in treatments for disordersrelated to oxidative stress and aging.</dcterms:abstract>
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