Cited by 152Parkinson's Disease Mechanisms and TreatmentsAlzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration Mechanisms

Aggregation and neurotoxicity of α-synuclein and related peptides

EI-Agnaf, O. M. A., Irvine, G. B.·2002·Biochemical Society Transactions

Abstract

Fibrillar deposits of alpha-synuclein occur in several neurodegenerative diseases. Two mutant forms of alpha-synuclein have been associated with early-onset Parkinson's disease, and a fragment has been identified as the non-amyloid-beta peptide component of Alzheimer's disease amyloid (NAC). Upon aging, solutions of alpha-synuclein and NAC change conformation to beta-sheet, detectable by CD spectroscopy, and form oligomers that deposit as amyloid-like fibrils, detectable by electron microscopy. These aged peptides are also neurotoxic. Experiments on fragments of NAC have enabled the region of NAC responsible for its aggregation and toxicity to be identified. NAC(8-18) is the smallest fragment that aggregates, as indicated by the concentration of peptide remaining in solution after 3 days, and forms fibrils, as determined by electron microscopy. Fragments NAC(8-18) and NAC(8-16) are toxic, whereas NAC(12-18), NAC(9-16) and NAC(8-15) are not. Hence residues 8-16 of NAC comprise the region crucial for toxicity. Toxicity induced by alpha-synuclein, NAC and NAC(1-18) oligomers occurs via an apoptotic mechanism, possibly initiated by oxidative damage, since these peptides liberate hydroxyl radicals in the presence of iron. Molecules with anti-aggregational and/or antioxidant properties may therefore be potential therapeutic agents.

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Crossref · 10.1042/bst0300559

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  • Ferric iron can, in vitro, catalyse the conversion of α-synuclein from the α-helix to the β-sheet conformation that is present in Lewy bodies.

    “Ferric iron can, in vitro, catalyse the conversion of α-synuclein from the α-helix to the β-sheet conformation that is present in Lewy bodies.113,114”

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Authors
EI-Agnaf, O. M. A., & Irvine, G. B.
Affiliations
  • Lancaster University (GB)
  • Queen's University Belfast (GB)
Venue
Biochemical Society Transactions
Published
2002-08-01
Volume
30
Issue
4
Pages
559-565
ISSN
  • 0300-5127 (ISSN-L)
  • 1470-8752
OpenAlex
W2020351832
Cited by
151
References
0
Citations by year
2026: 3 · 2025: 2 · 2024: 7 · 2023: 4 · 2022: 6 · 2021: 6 · 2020: 5 · 2019: 3 · 2018: 6 · 2017: 4 · 2016: 3 · 2015: 11 · 2014: 7 · 2013: 5 · 2012: 8
FWCI
5.57
Type
journal article
Language
en
Open access
closed
Locations
  • Biochemical Society Transactions (publishedVersion)
  • PubMed (publishedVersion)
  • Research Portal (Queen's University Belfast) (submittedVersion)
Topics
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
alpha-synuclein, neurotoxicity, peptide aggregation, amyloid fibrils, Parkinson's disease, β-sheet conformation, oligomers, oxidative damage, hydroxyl radicals, iron, antioxidant therapy, peptide fragments
MeSH terms
Alzheimer Disease, Animals, Brain, Cell Survival, Humans, Molecular Weight, Nerve Tissue Proteins, Neurotoxins, Phosphoproteins, Protein Conformation, PC12 Cells, Protein Structure, Secondary, Rats, Synucleins, alpha-Synuclein

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