Cited by 57Alzheimer's disease research and treatmentsNicotinic Acetylcholine Receptors StudyNeuroinflammation and Neurodegeneration Mechanisms

Functional Interactions of Fibrillar and Oligomeric Amyloid-β with Alpha7 Nicotinic Receptors in Alzheimer's Disease

Lilja, Anna M., Porras, Omar, Storelli, Elisa, Nordberg, Agneta, Marutle, Amelia·2011·Journal of Alzheimer's Disease

Abstract

Amyloid-β (Aβ) peptides in the brain of patients with Alzheimer's disease (AD) assemble into various aggregation forms that differ in size, structure, and functional properties. Previous studies have shown that Aβ binds to nicotinic acetylcholine receptors (nAChRs) and activates signaling cascades that result in the disruption of synaptic functions. These findings suggest a possible link between impaired cholinergic neurotransmitter function in AD and Aβ pathogenesis. However, it is not yet known how the different Aβ assemblies interact with specific nAChR subtypes. In the present study, we demonstrate that neurotoxicity in neuronal cells in culture induced by fibrillar Aβ(1-40) is prevented through an α7 nAChR-dependent mechanism. The α7 nAChR agonists varenicline and JN403 increased binding of the amyloid ligand [³H]PIB to fibrillar Aβ in AD frontal cortex autopsy tissue. This suggests that the presence of nAChR agonists may inhibit interaction of Aβ with α7 nAChRs and prevent the formation of Aβ/α7 nAChR complexes. This interaction was confirmed in binding assays with [¹²⁵I]Aβ(1-40) and α7 nAChRs in autopsy brain tissue homogenates from the frontal cortex. The functional effects of Aβ fibrils and oligomers on nAChRs were examined by measuring intracellular calcium ([Ca(2+)](i) levels. Oligomeric, but not fibrillar Aβ(1-40), increased [Ca(2+)](i) in neuronal cells, and this effect was attenuated by varenicline. Our findings demonstrate that fibrillar Aβ exerts neurotoxic effects mediated partly through a blockade of α7 nAChRs, whilst oligomeric Aβ may act as a ligand activating α7 nAChRs, thereby stimulating downstream signaling pathways.

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Crossref · 10.3233/jad-2010-101242

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  • Oligomeric Aβ particles suppress LTP and enhance LTD through interactions with synaptic proteins such as mGluRs and potentially α7-nAChR.

    “Oligomeric A␤ particles suppress LTP and enhance long-term depression (LTD) through interactions with synaptic proteins (and reviewed in Refs.31 and 55), such as metabotropic glutamate receptors (mGluRs) as well as potentially the Ca 2ϩ -permeable ␣7-nicotinic acetylcholine receptor (␣7-nAChR) (reviewed in Refs.56 and 57).”

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Authors
Lilja, A. M., Porras, O., Storelli, E., Nordberg, A., & Marutle, A.
Affiliations
Karolinska University Hospital (SE)
Corresponding author
Marutle, Amelia
Venue
Journal of Alzheimer's Disease
Published
2011-02-26
Volume
23
Issue
2
Pages
335-347
ISSN
  • 1387-2877 (ISSN-L)
  • 1875-8908
OpenAlex
W2152703476
Cited by
57
References
47
Citations by year
2025: 1 · 2024: 2 · 2023: 4 · 2022: 2 · 2020: 2 · 2019: 5 · 2018: 4 · 2017: 2 · 2016: 6 · 2015: 5 · 2014: 3 · 2013: 11 · 2012: 4
FWCI
5.02
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Alzheimer s Disease (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Northwestern University
  • Universität Basel
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
amyloid-beta, alpha7 nicotinic acetylcholine receptor
MeSH terms
Varenicline, Aged, Alzheimer Disease, Analysis of Variance, Animals, Benzazepines, Carbamates, Cells, Cultured, Frontal Lobe, Humans, Neurons, Quinoxalines, Quinuclidines, Receptors, Nicotinic, Amyloid beta-Peptides, PC12 Cells, Nicotinic Agonists, Cell Line, Tumor, Rats, alpha7 Nicotinic Acetylcholine Receptor

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