Neurodegeneration induced by beta-amyloid peptides in vitro: the role of peptide assembly state
Open accessAbstract
The progressive neurodegeneration of Alzheimer's disease has been hypothesized to be mediated, at least in part, by beta-amyloid protein. A relationship between the aggregation state of beta-amyloid protein and its ability to promote degeneration in vitro has been previously suggested. To evaluate this hypothesis and to define a structure- activity relationship for beta-amyloid, aggregation properties of an overlapping series of synthetic beta-amyloid peptides (beta APs) were investigated and compared with beta AP neurotoxic properties in vitro. Using light microscopy, electrophoresis, and ultracentrifugation assays, we found that few beta APs assembled into aggregates immediately after solubilization, but that over time peptides containing the highly hydrophobic beta 29–35 region formed stable aggregations. In short-term neuronal cultures, toxicity was associated specifically with those beta APs that also exhibited significant aggregation. Further, upon the partial reversal of beta 1–42 aggregation, a concomitant loss of toxicity was observed. A synthetic peptide derived from a different amyloidogenic protein, islet amyloid polypeptide, exhibited aggregation but not toxicity, suggesting that beta AP-induced neurotoxicity in vitro is not a nonspecific reaction to aggregated protein. The correlation between beta AP aggregation and neurotoxicity was also observed in long-term neuronal cultures but not in astrocyte cultures. These data are consistent with the hypothesis that beta-amyloid protein contributes to neurodegeneration in Alzheimer's disease.
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Aβ(22-35) rapidly aggregates in aqueous solutions.
“It has the experimental advantage for in vitro studies of rapidly aggregating in aqueous solutions (Pike et al., 1993).”
From The mitochondria-targeted antioxidant MitoQ prevents loss of spatial memory retention and early neuropathology in a transgenic mouse model of Alzheimer’s disease (2011) · cites this paper as Pike et al., 1993
The PAP aggregation section and Table 1 (p. 1687) show that freshly prepared Aβ(25–35) forms visible aggregates in aqueous stock solution. The cited paper reports this for Aβ(25–35), not the claimed Aβ(22–35), so it does not establish that the specified fragment rapidly aggregates. (LLM, conf=0.84)
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Ganeshpurkar, A., Swetha, R., Kumar, D., Gangaram, G. P., Singh, R., Gutti, G., Jana, S., Kumar, D., Kumar, A., & Singh, S. K. (2019) · Current Topics in Medicinal Chemistry · doi:10.2174/1568026619666190304153353 · Cited by 30 · see citing works
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“Preparation and treatment of Aβ1‐42 The preparation procedure for Aβ 1-42 (Bachem AG, Switzerland) involved the incubation of fresh solubilized peptides at a concentration of 500 μM in sterile distilled water for a period of 5 days at a temperature of 37 °C [60].”
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β-adaptin: Key molecule for microglial scavenger receptor function under oxidative stress
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- Authors
- Pike, C., Burdick, D., Walencewicz, A., Glabe, C., & Cotman, C.
- Affiliations
- University of California, Irvine (US)
- Venue
- The Journal of Neuroscience
- Publisher
- Society for Neuroscience
- Published
- 1993-04-01
- Volume
- 13
- Issue
- 4
- Pages
- 1676-1687
- ISSN
- 0270-6474 (ISSN-L)
- 1529-2401
- PMC
- PMC6576726
- OpenAlex
- W1960543132
- Cited by
- 1,417
- References
- 7
- Citations by year
- 2026: 9 · 2025: 11 · 2024: 15 · 2023: 33 · 2022: 15 · 2021: 20 · 2020: 27 · 2019: 24 · 2018: 17 · 2017: 22 · 2016: 28 · 2015: 21 · 2014: 32 · 2013: 32 · 2012: 32
- FWCI
- 38.25
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute on Aging (R35AG007918, AG07918)
- National Institute of Mental Health (MH 14599, T32MH014599)
- Topics
- Health Sciences › Medicine › Physiology › 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, Alzheimer's disease, neurodegeneration, neurotoxicity, peptide aggregation, structure-activity relationship, amylin, neuronal culture, astrocytes, amyloid fibril formation
- MeSH terms
- Amino Acid Sequence, Amyloid, Animals, Cells, Cultured, Molecular Sequence Data, Nerve Degeneration, Neurons, Neurotoxins, Peptide Mapping, Structure-Activity Relationship, Time Factors, Amyloid beta-Peptides, Islet Amyloid Polypeptide
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
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