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<dc:title xml:lang="fr">Correction des déficits cognitifs chez des modèles murins de trisomie 21 par un inhibiteur de la kinase DYRK1A : étude pharmacologique et mécanistique</dc:title>
<dcterms:alternative xml:lang="en">Cognitive deficits correction by a DYRK1A kinase inhibitor in mouse models of Down syndrome : pharmacological and mechanistic studies</dcterms:alternative>
<dc:subject xml:lang="fr">Trisomie 21</dc:subject>
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<dc:subject xml:lang="fr">L41</dc:subject>
<dc:subject xml:lang="fr">Cognition</dc:subject>
<dc:subject xml:lang="en">Down Syndrome</dc:subject>
<dc:subject xml:lang="en">DYRK1A</dc:subject>
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<tef:elementdEntree autoriteExterne="027854175" autoriteSource="Sudoc">Troubles de la cognition</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">La trisomie 21 (T21) résulte de la présence d’une extra-copie du chromosome 21 (Chr21). Parmi les gènes candidats impliqués dans les déficits cognitifs liés à la T21, DYRK1A est un des plus pertinents. Des études ont montré une corrélation entre l’augmentation de son activité kinase avec les déficits mnésiques observés dans les modèles murins de T21. Afin de comprendre les mécanismes sous-jacents aux altérations cognitives causées par son surdosage, nous avons utilisé des modèles murins sur-exprimant DYRK1A seule ou en plus d’autres gènes orthologues au Chr21, ainsi que des inhibiteurs spécifiques de DYRK1A (Leucettines) synthétisés par ManRos Therapeutics. Ici sont présentées les conséquences d’un traitement chronique avec ces Leucettines sur la cognition de ces animaux. Des analyses du phosphoprotéome de ces souris traitées ou non avec une des Leucettines, la L41, a mis en lumière des cibles et mécanismes biologiques impliqués dans les perturbations mnésiques de ces animaux. Enfin, ce projet a surtout permis de mettre en évidence un nouvel inhibiteur plus sélectif pour DYRK1A comme candidat-médicament pour l’amélioration des fonctions cognitives des porteurs de la T21.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Down Syndrome (DS), is due to the presence of an extra copy of chromosome 21 (Ch21). Among the candidates implicated in DS intellectual disabilities, DYRK1A is one of the most relevant. Several studies have shown a correlation between an increase of its kinase activity and the intellectual defects observed in DS models. In order to understand the mechanisms underlying the impact of DYRK1A overdosage on cognitive alterations, we used several trisomic mouse models expressing DYRK1A alone or with additional Hsa21 orthologous genes and specific DYRK1A inhibitors (Leucettines) from ManRos Therapeutics. We will present here the consequence of the Leucettines treatment following repetitive administration to several DS mouse models on the behavior and cognition. Further analysis of the phosphoproteome of DS mouse models treated or not with one of the Leucettine, the L41, unravels a few targets and pathways which are involved in the cognitive alterations observed in these trisomic mice. These results support the potential of more selective DYRK1A inhibitor as a therapeutic approach to improve cognitive functions in DS patients.</dcterms:abstract>
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