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<dc:title xml:lang="fr">Dégénérescence des neurones moteurs cortico-spinaux dans un modèle murin de sclérose latérale amyotrophique : dynamique spatio-temporelle et mécanismes moléculaires</dc:title>
<dcterms:alternative xml:lang="en">Degeneration of corticospinal motor neurons in a mouse model of amyotrophic lateral sclerosis : spatio-temporal dynamics and molecular mechanisms</dcterms:alternative>
<dc:subject xml:lang="fr">Neurones moteurs cortico-spinaux</dc:subject>
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<dc:subject xml:lang="fr">Sclérose latérale amyotrophique</dc:subject>
<dc:subject xml:lang="en">Corticospinal motor neurons</dc:subject>
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<dc:subject xml:lang="en">Amyotrophic lateral sclerosis</dc:subject>
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<dcterms:abstract xml:lang="fr">La sclérose latérale amyotrophique (SLA) se définit cliniquement par la dégénérescence combinée des neurones moteurs cortico-spinaux (NMCS) et des motoneurones bulbaires et spinaux (MnB et MnS). Quoique l’idée d’une origine corticale de la SLA soit de plus en plus considérée, la pathologie corticale, la dynamique spatio-temporelle de la dégénérescence des NMCS et les voies moléculaires impliquées restent peu connues. Ce travail de thèse a essentiellement cherché à pallier ce manque. Nous avons montré que chez les souris Sod1G86R, la perte des NMCS, qui semble se produire en l’absence de gliose réactionnelle majeure, se manifeste de manière somatotopique et précède l'apparition des symptômes moteurs et la dégénérescence des MnS. Nous avons purifié, grâce au développement d'un nouveau protocole, les NMCS adultes du cortex cérébral de souris saines ou malades à quatre stades de la maladie. L’analyse RNA-seq a permis d’identifier de nouveaux acteurs moléculaires précoces pouvant fournir une base pour le développement d'approches thérapeutiques fondées sur le maintien de NMCS sains et fonctionnels, et à long terme, à initier des stratégies thérapeutiques alternatives pour la SLA.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Amyotrophic lateral sclerosis (ALS) is clinically defined as the combined degeneration of the corticospinal motor neurons (CSMN) along with the bulbar and spinal motor neurons (BMN and SMN). While a growing body of evidence points to the cerebral cortex as the potential initiation site of ALS, little is known about the cortical pathology, the spatio-temporal dynamics of CSMN degeneration, and the molecular pathways involved. This thesis work aimed at filling this knowledge gap. In Sod1G86R, we showed that CSMN loss seems to take place without major gliosis, occurs in a somatotopic manner and precedes motor symptom appearance and SMN degeneration. We purified, thanks to the development of a novel protocol, adult CSMN from the cerebral cortex of healthy or diseased mice from early presymptomatic ages to the end stage of the disease. The RNA-seq analysis has made it possible to identify new and early molecular players in ALS. This would provide a foundation for the development of therapeutic approaches based on the maintenance of healthy and functional CSMN, and, on the long run, may in turn inform the development of alternative therapeutic strategies for ALS.</dcterms:abstract>
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