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Revealing NOTCH-dependencies in synaptic targets associated with Alzheimer's disease

Perna, A and Marathe, S and Dreos, R and Falquet, L and Akarsu Egger, H and Auber, LA (2021) Revealing NOTCH-dependencies in synaptic targets associated with Alzheimer's disease. In: Molecular and Cellular Neuroscience, 115 .

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Official URL: https://doi.org/10.1016/j.mcn.2021.103657


Recent studies have identified NOTCH signaling as a contributor of neurodegeneration including Alzheimer's disease' (AD) pathophysiology. As part of the efforts to understand molecular mechanisms and players involved in neurodegenerative dementia, we employed transgenic mouse models with Notch1 and Rbpjk loss of function (LOF) mutation in pyramidal neurons of the CA fields. Using RNA-seq, we have investigated the differential expression of NOTCH-dependent genes either upon environmental enrichment (EE) or upon kainic acid (KA) injury. We found a substantial genetic diversity in absence of both NOTCH1 receptor or RBPJK transcriptional activator. Among differentially expressed genes, we observed a significant upregulation of Gabra2a in both knockout models, suggesting a role for NOTCH signaling in the modulation of E/I balance. Upon excitotoxic stimulation, loss of RBPJK results in decreased expression of synaptic proteins with neuroprotective effects. We confirmed Nptx2, Npy, Pdch8, TncC as direct NOTCH1/RBPJK targets and Bdnf and Scg2 as indirect targets. Finally, we translate these findings into human entorhinal cortex containing the hippocampal region from AD patients performing targeted transcripts analysis. We observe an increased trend for RBPJK and the ligand DNER starting in the mild-moderate stage of the disease with no change of NOTCH1 expression. Alongside, expression of the Notch targets Hes5 and Hey1 tend to rise in the intermediate stage of the disease and drop in severe AD. Similarly the newly discovered NOTCH targets, NPTX2, NPY, BDNF show an up-warding tendency during the mild-moderate stage, and decline in the severe phase of the disease. This study identifies NOTCH as a central signaling cascade capable of modulating synaptic transmission in response to excitatory insult through the activation of neuroprotective genes that have been associated to AD. © 2021

Item Type: Journal Article
Publication: Molecular and Cellular Neuroscience
Publisher: Academic Press Inc.
Additional Information: The copyright for this article belongs to Authors
Department/Centre: Division of Biological Sciences > Centre for Neuroscience
Date Deposited: 21 Sep 2021 09:32
Last Modified: 21 Sep 2021 09:32
URI: http://eprints.iisc.ac.in/id/eprint/69774

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