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<dc:title xml:lang="fr">Réorganisations synaptiques dans l'hippocampe et récupération fonctionnelle après lésion du cortex entorhinal : effets de l'allèle APOE4, du bourgeonnement cholinergique et de la réinnervation glutamatergique</dc:title>
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<dc:subject xml:lang="fr">APOE4</dc:subject>
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<dc:subject xml:lang="fr">Maladie d’Alzheimer</dc:subject>
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<dc:subject xml:lang="en">Alzheimer’s disease</dc:subject>
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<dcterms:abstract xml:lang="fr">La maladie d’Alzheimer est souvent précédée de troubles cognitifs légers (MCI) associés à la lésion du cortex entorhinal, une région interconnecté avec l’hippocampe. Cependant, un tiers des patients MCI présentent une rémission cognitive suggérant l’action de mécanismes compensatoires. Ces mécanismes pourraient être déficitaires chez les patients porteurs de l’allèle APOE4 présentant un MCI plus agressif.Par des approches multidisciplinaires chez la Souris, ce travail a démontré que la lésion entorhinale induit des déficits comportementaux et une hyperactivité de l’hippocampe. Or, le bourgeonnement des fibres cholinergique dans l’hippocampe compense ces déficits. Comme le bourgeonnement cholinergique est inhibé en présence de l’APOE4, cela pourrait contribuer au déclin cognitif exacerbé de ces patients. Par conséquent, l’inhibition de l’hyperactivité hippocampique chez les 50% de patients APOE4 représente une alternative prometteuse pour le traitement symptomatique du MCI.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Mild Cognitive Impairments (MCI) often precedes Alzheimer’s disease (AD) and is characterized by the loss of entorhinal neurons leading to a hippocampal disconnection. However, MCI patients also revert to normal cognition, suggesting compensatory mechanisms that alter the disease progression. This compensation may be impaired in patients bearing the APOE4 allele that are more prone to MCI, present less cognitive reversion and faster transition to AD.This work in mice, demonstrated that the sprouting of cholinergic fibers compensates entorhinal lesions through the reduction of the related hippocampal hyperactivity. As in APOE4 mice the cholinergic sprouting was altered in association with cognitive impairments, such impaired synaptic compensation may contribute to the faster cognitive decline of these patients. Therefore, supporting or mimicking the cholinergic control on hippocampal hyperactivity may represent a promising alternative therapeutic strategy for APOE4-carriers.</dcterms:abstract>
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