Aβ1-42 Accumulation Accompanies Changed Expression of Ly6/uPAR Proteins, Dysregulation of the Cholinergic System, and Degeneration of Astrocytes in the Cerebellum of Mouse Model of Early Alzheimer Disease

Alzheimer disease (AD) is a widespread neurodegenerative disease characterized by the accumulation of oligomeric toxic forms of β-amyloid (Aβ1-42) and dysfunction of the cholinergic system in the different brain regions. However, the exact mechanisms of AD pathogenesis and the role of the nicotinic...

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Veröffentlicht in:International journal of molecular sciences 2023-10, Vol.24 (19), p.14852
Hauptverfasser: Bychkov, Maxim L, Isaev, Aizek B, Andreev-Andrievskiy, Alexander A, Petrov, Konstantin, Paramonov, Alexander S, Kirpichnikov, Mikhail P, Lyukmanova, Ekaterina N
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container_title International journal of molecular sciences
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creator Bychkov, Maxim L
Isaev, Aizek B
Andreev-Andrievskiy, Alexander A
Petrov, Konstantin
Paramonov, Alexander S
Kirpichnikov, Mikhail P
Lyukmanova, Ekaterina N
description Alzheimer disease (AD) is a widespread neurodegenerative disease characterized by the accumulation of oligomeric toxic forms of β-amyloid (Aβ1-42) and dysfunction of the cholinergic system in the different brain regions. However, the exact mechanisms of AD pathogenesis and the role of the nicotinic acetylcholine receptors (nAChRs) in the disease progression remain unclear. Here, we revealed a decreased expression of a number of the Ly6/uPAR proteins targeting nAChRs in the cerebellum of 2xTg-AD mice (model of early AD) in comparison with non-transgenic mice both at mRNA and protein levels. We showed that co-localization of one of them, - neuromodulator Lynx1, with α7-nAChR was diminished in the vicinity of cerebellar astrocytes of 2xTg-AD mice, while Aβ1-42 co-localization with this receptor present was increased. Moreover, the expression of anti-inflammatory transcription factor KLF4 regulating transcription of the genes was decreased in the cerebellum of 2xTg-AD mice, while expression of inflammatory cytokine TNF-α was increased. Based on these data together with observed astrocyte degeneration in the cerebellum of 2xTg-AD mice, we suggest the mechanism by which expression of the Ly6/uPAR proteins upon Aβ pathology results in dysregulation of the cholinergic system and particularly of α7-nAChR function in the cerebellum. This leads to enhanced neuroinflammation and cerebellar astrocyte degeneration.
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subjects Advertising executives
alpha7 Nicotinic Acetylcholine Receptor - genetics
alpha7 Nicotinic Acetylcholine Receptor - metabolism
Alzheimer Disease - metabolism
Alzheimer's disease
Amyloid beta-Peptides - metabolism
Analysis
Animals
Astrocytes - metabolism
Brain
Cerebellum - metabolism
Cholinergic Agents - metabolism
Cognitive ability
Genes
Genetic engineering
Genetic transcription
Localization
Mice
Neurodegenerative Diseases - metabolism
Peptides
Physiological aspects
Proteins
Receptors, Nicotinic - metabolism
RNA
Target marketing
Transcription factors
Transgenic animals
title Aβ1-42 Accumulation Accompanies Changed Expression of Ly6/uPAR Proteins, Dysregulation of the Cholinergic System, and Degeneration of Astrocytes in the Cerebellum of Mouse Model of Early Alzheimer Disease
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