Évaluation de l'interaction entre les interneurones et la microglie dans la région CA1 de l'hippocampe de souris présentant les symptômes de la maladie d'Alzheimer

Authors: Gervais, Etienne
Advisor: Topolnik, Lisa
Abstract: Alzheimer’s disease (AD) is the most common form of dementia. The mechanisms associated to this neurodegenerative disease are not completely understood and with the aging population it is now imperative to develop new diagnosis tools and therapies for this pathology. There is growing evidence associating AD cognitive deficits to a dysregulation of the excitation/inhibition balance in the hippocampus, but also to a sustained level of neuroinflammation caused by exaggerated microglia activation. While numerous studies have assessed the functional interaction between principal neurons and microglia, much less is known about the specific interaction between microglia and hippocampal GABAergic interneurons. Using immunofluorescence and confocal microscopy, we studied the structural interaction between microglia and two subtypes of inhibitory interneurons involved in memory processes: somatostatin- (SOM+) and parvalbumin-expressing interneurons (PV+). Our results showed that almost all of these interneurons were interacting with microglia in control conditions and that this high level of interaction was maintained in mice presenting AD symptoms (APP/PS1 mice). We also reported that microglia interacted with every neuronal structural domain. Interneurons somata were contacted differently in each subtype suggesting a different control depending on the type of interneuron contacted. Microglia was preferentially interacting with proximal dendrites suggesting a role of these contacts in synaptic integration. Our results showed no major structural changes in AD mice indicating that the observed functional impairments during AD may be caused by functional modifications in these contacts or that these interactions are not involved in the pathogenesis of AD.
Document Type: Mémoire de maîtrise
Issue Date: 2019
Open Access Date: 27 November 2019
Permalink: http://hdl.handle.net/20.500.11794/37352
Grantor: Université Laval
Collection:Thèses et mémoires

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