Rôle de la dérégulation neuronale de la protéine kinase activée par l’AMP (AMPK) dans la pathologie tau, l’intégrité des synapses et le métabolisme énergétique : relevance pour la maladie d’Alzheimer

Abstract : Alzheimer's disease (AD) is a neurodegenerative disorder mainly characterized by the presence of amyloid deposits and neurofibrillary tangles composed of hyperphosphorylated tau proteins. Tau is a microtubule-associated protein that bears many phosphorylation sites which can be phosphorylated by different kinases. Beside tau pathology, AD is also characterized by cerebral metabolic alterations and synaptic loss, the latter being responsible for the development of cognitive disorders. Indeed, synapses are essential for memory formation and require a large amount of energy to maintain their functions. Interestingly, studies have suggested that AMP-activated protein kinase (AMPK) – a crucial intracellular metabolic sensor – could be involved in the development of AD. Indeed, in vitro studies have shown that AMPK is a tau kinase. In addition, AMPK is deregulated in degenerating neurons of AD patients brain where it co-localizes with hyperphosphorylated tau proteins. Additionally, studies carried out in our team showed that upon synaptic activation, AMPK activity is essential to maintain neuronal energy levels thus suggesting that a deregulation of its activity could have harmful impact on neuronal metabolism. On the basis of these data, the objectives of this thesis were to determine the impact of neuronal AMPK deregulation on tau pathology, synaptic loss and neuronal energy metabolism in primary neurons and in vivo in mice. The achievement of these objectives allowed us to demonstrate (1) that AMPK regulated tau phosphorylation and pathology (2) that AMPK deregulation caused a decrease of synapses number as well as a loss of neuronal networks functionality, through a signaling pathway involving autophagy and (3) that AMPK deregulation impacted on neuronal energy metabolism. In conclusion, this thesis has provided a better understanding of the role of AMPK deregulation in the development of different hallmarks of AD. Altogether, these data strongly suggest that AMPK could be the link between neuronal metabolism dysfunctions and the development of the alteration that occur during AD.
Document type :
Theses
Complete list of metadatas

Cited literature [829 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-02162394
Contributor : Abes Star <>
Submitted on : Friday, June 21, 2019 - 5:21:07 PM
Last modification on : Thursday, July 4, 2019 - 10:48:10 AM

File

2018LILUS034.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-02162394, version 1

Collections

Citation

Manon Domise. Rôle de la dérégulation neuronale de la protéine kinase activée par l’AMP (AMPK) dans la pathologie tau, l’intégrité des synapses et le métabolisme énergétique : relevance pour la maladie d’Alzheimer. Médecine humaine et pathologie. Université du Droit et de la Santé - Lille II, 2018. Français. ⟨NNT : 2018LIL2S034⟩. ⟨tel-02162394⟩

Share

Metrics

Record views

413

Files downloads

101