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Amyloid seeds formed by cellular uptake, concentration, and aggregation of the amyloid-beta peptide
Open accessAbstract
One of the neuropathological hallmarks of Alzheimer's disease (AD) is the amyloid plaque, primarily composed of aggregated amyloid-beta (Aβ) peptide. In vitro, Aβ 1–42 , the major alloform of Aβ found in plaques, self-assembles into fibrils at micromolar concentrations and acidic pH. Such conditions do not exist in the extracellular fluid of the brain where the pH is neutral and Aβ concentrations are in the nanomolar range. Here, we show that extracellular soluble Aβ (sAβ) at concentrations as low as 1 nM was taken up by murine cortical neurons and neuroblastoma (SHSY5Y) cells but not by human embryonic kidney (HEK293) cells. Following uptake, Aβ accumulated in Lysotracker-positive acidic vesicles (likely late endosomes or lysosomes) where effective concentrations (>2.5 μM) were greater than two orders of magnitude higher than that in the extracellular fluid (25 nM), as quantified by fluorescence intensity using laser scanning confocal microscopy. Furthermore, SHSY5Y cells incubated with 1 μM Aβ 1–42 for several days demonstrated a time-dependent increase in intracellular high molecular weight (HMW) (>200 kDa) aggregates, which were absent in cells grown in the presence of Aβ 1–40 . Homogenates from these Aβ 1–42 -loaded cells were capable of seeding amyloid fibril growth. These results demonstrate that Aβ can be taken up by certain cells at low physiologically relevant concentrations of extracellular Aβ, and then concentrated into endosomes/lysosomes. At high concentrations, vesicular Aβ aggregates to form HMW species which are capable of seeding amyloid fibril growth. We speculate that extrusion of these aggregates may seed extracellular amyloid plaque formation during AD pathogenesis.
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“Although amyloid beta plaques are extracellular, mounting evidence suggests that aggregation also begins within neurons, where uptake and subsequent degradation within lysosomes has been dysregulated leading to intraneuronal accumulation leading to aggregation [14–20].”
From The Sigma-2 Receptor/TMEM97, PGRMC1, and LDL Receptor Complex Are Responsible for the Cellular Uptake of Aβ42 and Its Protein Aggregates (2020) · cites this paper as [19]
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“In contrast to the extracellular space, microglial lysosomes provide a suitable environment to facilitate Aβ aggregation, potentially contributing to the onset of plaque pathology15.”
From Sustained microglial depletion with CSF1R inhibitor impairs parenchymal plaque development in an Alzheimer’s disease model (2019) · cites this paper as [15]
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“Depending on the concentrations and cellular conditions, some Ab molecules might aggregate within the lysosomes as intracellular Ab, which could eventually serve to seed amyloid plaques (Hu et al. 2009).”
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Metadata
- Authors
- Hu, X., Crick, S. L., Bu, G., Frieden, C., Pappu, R. V., & Lee, J.-M.
- Affiliations
- Washington University in St. Louis (US)
- Department of Biomedical Engineering and Center for Computational Biology, and
- Department of Pediatrics, Cell Biology and Physiology, and
- Hope Center for Neurological Disorders (US)
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2009-12
- Volume
- 106
- Issue
- 48
- Pages
- 20324-20329
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC2787156
- OpenAlex
- W1968721593
- Cited by
- 426
- References
- 47
- Citations by year
- 2026: 16 · 2025: 25 · 2024: 22 · 2023: 36 · 2022: 30 · 2021: 20 · 2020: 22 · 2019: 26 · 2018: 28 · 2017: 36 · 2016: 24 · 2015: 17 · 2014: 30 · 2013: 23 · 2012: 31
- FWCI
- 15.68
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Proceedings of the National Academy of Sciences (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Rare & Special e-Zone (The Hong Kong University of Science and Technology) (submittedVersion)
- Funders
- Hope Center for Neurological Disorders
- National Institutes of Health
- National Institute on Aging (P01AG030128, R01AG027924)
- National Institute of Diabetes and Digestive and Kidney Diseases (R01-DK13332, R01DK013332)
- National Institute of Neurological Disorders and Stroke (P01 NS32636, R01NS48283, R01 NS67905, R01NS067905, R01NS056114, R01NS048283, P01NS032636)
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Alzheimer's disease research and treatments
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
- Keywords
- amyloid-beta, amyloid-beta 42, Aβ40, Alzheimer's disease, amyloid plaques, lysosomes, late endosomes, cellular uptake, neuroblastoma cells, cortical neurons, amyloid plaque formation
- MeSH terms
- Alzheimer Disease, Animals, Fluorescence, Humans, Neurons, Thiazoles, Immunoblotting, Amyloid beta-Peptides, Microscopy, Confocal, Cytoplasmic Vesicles, Cell Line, Tumor, Mice, Benzothiazoles, Plaque, Amyloid
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