Cited by 48Alzheimer's disease research and treatmentsPrion Diseases and Protein MisfoldingProtein Structure and Dynamics

Characterization of Pairs of Toxic and Nontoxic Misfolded Protein Oligomers Elucidates the Structural Determinants of Oligomer Toxicity in Protein Misfolding Diseases

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Limbocker, Ryan, Cremades, Nunilo, Cascella, Roberta, Tessier, Peter M., Vendruscolo, Michele, Chiti, Fabrizio·2023·Accounts of Chemical Research

Abstract

High Resolution Image Download MS PowerPoint Slide Conspectus The aberrant misfolding and aggregation of peptides and proteins into amyloid aggregates occurs in over 50 largely incurable protein misfolding diseases. These pathologies include Alzheimer’s and Parkinson’s diseases, which are global medical emergencies owing to their prevalence in increasingly aging populations worldwide. Although the presence of mature amyloid aggregates is a hallmark of such neurodegenerative diseases, misfolded protein oligomers are increasingly recognized as of central importance in the pathogenesis of many of these maladies. These oligomers are small, diffusible species that can form as intermediates in the amyloid fibril formation process or be released by mature fibrils after they are formed. They have been closely associated with the induction of neuronal dysfunction and cell death. It has proven rather challenging to study these oligomeric species because of their short lifetimes, low concentrations, extensive structural heterogeneity, and challenges associated with producing stable, homogeneous, and reproducible populations. Despite these difficulties, investigators have developed protocols to produce kinetically, chemically, or structurally stabilized homogeneous populations of protein misfolded oligomers from several amyloidogenic peptides and proteins at experimentally ameneable concentrations. Furthermore, procedures have been established to produce morphologically similar but structurally distinct oligomers from the same protein sequence that are either toxic or nontoxic to cells. These tools offer unique opportunities to identify and investigate the structural determinants of oligomer toxicity by a close comparative inspection of their structures and the mechanisms of action through which they cause cell dysfunction. This Account reviews multidisciplinary results, including from our own groups, obtained by combining chemistry, physics, biochemistry, cell biology, and animal models for pairs of toxic and nontoxic oligomers. We describe oligomers comprised of the amyloid-β peptide, which underlie Alzheimer’s disease, and α-synuclein, which are associated with Parkinson’s disease and other related neurodegenerative pathologies, collectively known as synucleinopathies. Furthermore, we also discuss oligomers formed by the 91-residue N-terminal domain of [NiFe]-hydrogenase maturation factor from E. coli, which we use as a model non-disease-related protein, and by an amyloid stretch of Sup35 prion protein from yeast. These oligomeric pairs have become highly useful experimental tools for studying the molecular determinants of toxicity characteristic of protein misfolding diseases. Key properties have been identified that differentiate toxic from nontoxic oligomers in their ability to induce cellular dysfunction. These characteristics include solvent-exposed hydrophobic regions, interactions with membranes, insertion into lipid bilayers, and disruption of plasma membrane integrity. By using these properties, it has been possible to rationalize in model systems the responses to pairs of toxic and nontoxic oligomers. Collectively, these studies provide guidance for the development of efficacious therapeutic strategies to target rationally the cytotoxicity of misfolded protein oligomers in neurodegenerative conditions.

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  • Solvent-exposed hydrophobic residues appear to be a key shared property of toxic oligomers.

    “In conclusion, solvent-exposed hydrophobic residues appear to be a key shared property of toxic oligomers [16].”

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  • Treatment of Alzheimer’s Disease: Beyond Symptomatic Therapies

    Buccellato, F. R., D’Anca, M., Tartaglia, G. M., Del Fabbro, M., Scarpini, E., & Galimberti, D. (2023) · International Journal of Molecular Sciences · doi:10.3390/ijms241813900 · Cited by 94 · see citing works

    “Each proteinopathy is characterized by different fibrillar aggregates, such as amyloid-β (A β ) plaques and neurofibrillary tangles of tau in AD, Lewy bodies of α - α -synuclein ( α Syn) in PD, or amyloid deposits of an immunoglobulin light chain in AL [16].”
    Background

Authors
Limbocker, R., Cremades, N., Cascella, R., Tessier, P. M., Vendruscolo, M., & Chiti, F.
Affiliations
  • United States Military Academy (US)
  • Universidad de Zaragoza (ES)
  • University of Florence (IT)
  • University of Michigan (US)
  • University of Cambridge (GB)
Corresponding author
Chiti, Fabrizio
Venue
Accounts of Chemical Research
Published
2023-04-18
Volume
56
Issue
12
Pages
1395-1405
ISSN
  • 0001-4842 (ISSN-L)
  • 1520-4898
OpenAlex
W4366251352
Cited by
48
References
54
Citations by year
2026: 14 · 2025: 16 · 2024: 14 · 2023: 4
FWCI
8.47
Type
journal article
Language
en
Open access
Locations
  • Accounts of Chemical Research (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Florence Research (University of Florence) (submittedVersion, other-oa)
  • Zaguan (University of Zaragoza Repository) (submittedVersion, cc-by)
Funders
  • European Union Agency for Network and Information Security
  • Regione Toscana
  • Defense Threat Reduction Agency
  • Division of Chemical, Bioengineering, Environmental, and Transport Systems (1605266, 1813963)
  • Army Research Laboratory
  • National Institutes of Health (R35GM136300, RF1AG059723)
  • Ministerio de Ciencia e Innovaci?n (MCIN/AEI/10.13039/501100011033, PGC2018-096335-B100)
  • Airalzh Foundation
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Prion Diseases and Protein Misfolding
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
Keywords
oligomer toxicity, amyloid-beta, alpha-synuclein, synucleinopathies, Alzheimer's disease, Parkinson's disease, amyloid fibril formation, neurodegenerative diseases
MeSH terms
Alzheimer Disease, Amyloid, Animals, Escherichia coli, Amyloid beta-Peptides, Proteostasis Deficiencies

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