Cited by 244Alzheimer's disease research and treatmentsPrion Diseases and Protein MisfoldingDementia and Cognitive Impairment Research

New Insights on How Metals Disrupt Amyloid β-Aggregation and Their Effects on Amyloid-β Cytotoxicity

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Yoshiike, Yuji, Tanemura, Kentaro, Murayama, Ohoshi, Akagi, Takumi, Murayama, Miyuki, Sato, Shinji, Sun, Xiaoyan, Tanaka, Nobuo +1 more·2001·Journal of Biological Chemistry

Abstract

Amyloid-beta protein (A beta) aggregates in the brain to form senile plaques. By using thioflavin T, a dye that specifically binds to fibrillar structures, we found that metals such as Zn(II) and Cu(II) normally inhibit amyloid beta-aggregation. Another method for detecting A beta, which does not distinguish the types of aggregates, showed that these metals induce a non-beta-sheeted aggregation, as reported previously. Secondary structural analysis and microscopic studies revealed that metals induced A beta to make non-fibrillar aggregates by disrupting beta-sheet formation. These non-fibrillar A beta aggregates displayed much weaker Congo Red birefringence, and in separate cell culture experiments, were less toxic than self beta-aggregates, as demonstrated by 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide assay. The toxicity of soluble A beta was enhanced in the presence of Cu(II), which suggests the previously hypothesized role of A beta in generating oxidative stress. Finally, under an acidic condition, similar to that in the inflammation associated with senile plaques, beta-aggregation was robustly facilitated at one specific concentration of Zn(II) in the presence of heparin. However, because a higher concentration of Zn(II) virtually abolished this abnormal phenomenon, and at normal pH any concentrations strongly inhibit beta-aggregation and its associated cytotoxicity, including its anti-oxidative nature we suggest that Zn(II) has an overall protective ef…

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Crossref · 10.1074/jbc.m010706200

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Authors
Yoshiike, Y., Tanemura, K., Murayama, O., Akagi, T., Murayama, M., Sato, S., Sun, X., Tanaka, N., & Takashima, A.
Affiliations
  • Tokyo Institute of Technology (JP)
  • RIKEN Center for Brain Science (JP)
Corresponding author
Takashima, Akihiko
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2001-08
Volume
276
Issue
34
Pages
32293-32299
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2081099437
Cited by
244
References
60
Citations by year
2026: 1 · 2025: 2 · 2024: 2 · 2023: 4 · 2022: 5 · 2021: 6 · 2020: 8 · 2019: 12 · 2018: 9 · 2017: 11 · 2016: 6 · 2015: 6 · 2014: 12 · 2013: 9 · 2012: 22
FWCI
4.58
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
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
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
amyloid-beta, metal-induced aggregation, zinc, copper, amyloid cytotoxicity, oxidative stress, amyloid plaques, heparin, pH effect, Alzheimer's disease
MeSH terms
Animals, Cell Line, Cell Survival, Cells, Cultured, Circular Dichroism, Copper, Hippocampus, Humans, Neurons, Zinc, Amyloid beta-Peptides, Cell Death, Rats

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