Cited by 1,086Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchPrion Diseases and Protein Misfolding

A model for beta-amyloid aggregation and neurotoxicity based on free radical generation by the peptide: relevance to Alzheimer disease.

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Hensley, K, Carney, J M, Mattson, M P, Aksenova, M, Harris, M, Wu, J F, Floyd, R A, Butterfield, D A·1994·Proceedings of the National Academy of Sciences

Abstract

beta-Amyloid is a 39- to 43-amino-acid neurotoxic peptide that aggregates to form the core of Alzheimer disease-associated senile (amyloid) plaques. No satisfactory hypothesis has yet been proposed to explain the mechanism of beta-amyloid aggregation and toxicity. We present mass spectrometric and electron paramagnetic resonance spin trapping evidence that beta-amyloid, in aqueous solution, fragments and generates free radical peptides. beta-Amyloid fragments, at concentrations that previously have been shown to be neurotoxic to cultured neurons, can inactivate oxidation-sensitive glutamine synthetase and creatine kinase enzymes. Also, salicylate hydroxylation assays indicate that reactive oxygen species are generated by the beta-amyloid-(25-35) fragment during cell-free incubation. These results are formulated into a free radical-based unifying hypothesis for neurotoxicity of beta-amyloid and are discussed with reference to membrane molecular alterations in Alzheimer disease.

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Crossref · 10.1073/pnas.91.8.3270

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  • Aβ increases reactive species in neurons via multiple mechanisms, including direct Aβ-induced RS production, elevated NADPH oxidase activity, interaction with mitochondria-associated Aβ alcohol dehydrogenase, inhibition of cytochrome oxidase (respiratory complex IV), and leakage of electrons from the mitochondrial electron transport chain.

    “Aβ is reported to increase RS in neurons via multiple mechanisms, including direct Aβ-induced RS production, elevated NADPH oxidase activity, interaction with mitochondria-associated Aβ alcohol dehydrogenase, inhibition of cytochrome oxidase (respiratory complex IV), and by causing leakage of electrons from the mitochondrial electron transport chain (Hensley et al., 1994; Canevari et al., 1999; L”

    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 Hensley et al., 1994

    The Results and Discussion report that Aβ peptides generate free radicals and that the Aβ(25–35) fragment produces reactive oxygen species in cell-free experiments. They do not establish increased reactive species in neurons or address the listed NADPH oxidase, Aβ alcohol dehydrogenase, cytochrome oxidase, and mitochondrial electron-leakage mechanisms. No page numbers are available in our copy. (LLM, conf=0.88)

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Research works printed but not linked: 5

  1. [9]Oliver, C. N., Starke-Reed, P. E., Stadtman, E. R., Liu, G. J., Carney, J. M. & Floyd, R. A. (1990) Proc. Natl. Acad. Sci. USA 87, 5144–5147.
  2. [11]Miller, R. E., Hadenberg, R. & Gersham, H. (1978) Proc. Natl. Acad. Sci. USA 75, 1418–1422.
  3. [13]Janzen, E. G. (1980) in Free Radicals in Biology, ed. Pryor, W. A. (Academic, New York), Vol. 4, pp. 115-154.
  4. [19]Carney, J. M., Starke-Reed, P. E., Oliver, C. N., Landum, R. W., Cheng, M. S., Wu, J. F. & Floyd, R. A. (1991) Proc. Natl. Acad. Sci. USA 88, 3633–3636.
  5. [27]Smith, C. D., Carney, J. M., Starke-Reed, P. E., Oliver, C. N., Stadtman, E. R., Floyd, R. A. & Markesbery, W. R. (1991) Proc. Natl. Acad. Sci. USA 88, 10540–10543.

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Authors
Hensley, K., Carney, J. M., Mattson, M. P., Aksenova, M., Harris, M., Wu, J. F., Floyd, R. A., & Butterfield, D. A.
Affiliations
  • University of Kentucky (US)
  • Department of Chemistry, University of Kentucky, Lexington 40506.
Venue
Proceedings of the National Academy of Sciences
Published
1994-04-12
Volume
91
Issue
8
Pages
3270-3274
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2070117026
Cited by
1,086
References
23
Citations by year
2026: 6 · 2025: 12 · 2024: 20 · 2023: 16 · 2022: 21 · 2021: 26 · 2020: 15 · 2019: 18 · 2018: 26 · 2017: 15 · 2016: 23 · 2015: 27 · 2014: 26 · 2013: 32 · 2012: 34
FWCI
35.21
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Science Foundation (9108764)
  • Glenn Foundation for Medical Research
  • Fondation pour la Recherche Médicale
  • National Institutes of Health (AG-10836)
  • National Institute on Aging (AG 09690, P01AG010836, R01AG009690, AG 10836)
  • Office of Naval Research
  • National Institute of Neurological Disorders and Stroke (R01NS023307, NS-23307)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Prion Diseases and Protein Misfolding
Keywords
amyloid-beta, amyloid fibril formation, neurotoxicity, free radicals, reactive oxygen species, glutamine synthetase, creatine kinase, salicylate hydroxylation, amyloid plaques, Alzheimer's disease, peptide fragmentation, membrane alterations
MeSH terms
Alzheimer Disease, Amino Acid Sequence, Chromatography, High Pressure Liquid, Electron Spin Resonance Spectroscopy, Free Radicals, Gas Chromatography-Mass Spectrometry, Molecular Sequence Data, Neurotoxins, Salicylates, Amyloid beta-Peptides

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