The effect of Cu2+ and Zn2+ on the Aβ42 peptide aggregation and cellular toxicity

Anuj K. Sharma, Stephanie T. Pavlova, Jaekwang Kim, Jungsu Kim, Liviu M. Mirica

Research output: Contribution to journalArticle

Abstract

The coordination chemistry of Cu and Zn metal ions with the amyloid β (Aβ) peptides has attracted a lot of attention in recent years due to its implications in Alzheimer's disease. A number of reports indicate that Cu and Zn have profound effects on Aβ aggregation. However, the impact of these metal ions on Aβ oligomerization and fibrillization is still not well understood, especially for the more rapidly aggregating and more neurotoxic Aβ42 peptide. Here we report the effect of Cu2+ and Zn2+ on Aβ42 oligomerization and aggregation using a series of methods such as Thioflavin T (ThT) fluorescence, native gel and Western blotting, transmission electron microscopy (TEM), and cellular toxicity studies. Our studies suggest that both Cu2+ and Zn2+ ions inhibit Aβ42 fibrillization. While presence of Cu2+ stabilizes Aβ42 oligomers, Zn2+ leads to formation of amorphous, non-fibrillar aggregates. The effects of temperature, buffer, and metal ion concentration and stoichiometry were also studied. Interestingly, while Cu2+ increases the Aβ42-induced cell toxicity, Zn2+ causes a significant decrease in Aβ42 neurotoxicity. While previous reports have indicated that Cu2+ can disrupt β-sheets and lead to non-fibrillar Aβ aggregates, the neurotoxic consequences were not investigated in detail. The data presented herein including cellular toxicity studies strongly suggest that Cu2+ increases the neurotoxicity of Aβ42 due to stabilization of soluble Aβ42 oligomers.

Original languageEnglish (US)
Pages (from-to)1529-1536
Number of pages8
JournalMetallomics
Volume5
Issue number11
DOIs
StatePublished - Nov 1 2013

Fingerprint

Peptides
Metal ions
Toxicity
Oligomerization
Agglomeration
Ions
Oligomers
Metals
Amyloid
Stoichiometry
Buffers
Gels
Stabilization
Fluorescence
Transmission Electron Microscopy
Transmission electron microscopy
Alzheimer Disease
Western Blotting
Temperature
peptide A42

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Biophysics
  • Biomaterials
  • Biochemistry
  • Metals and Alloys

Cite this

The effect of Cu2+ and Zn2+ on the Aβ42 peptide aggregation and cellular toxicity. / Sharma, Anuj K.; Pavlova, Stephanie T.; Kim, Jaekwang; Kim, Jungsu; Mirica, Liviu M.

In: Metallomics, Vol. 5, No. 11, 01.11.2013, p. 1529-1536.

Research output: Contribution to journalArticle

Sharma, Anuj K. ; Pavlova, Stephanie T. ; Kim, Jaekwang ; Kim, Jungsu ; Mirica, Liviu M. / The effect of Cu2+ and Zn2+ on the Aβ42 peptide aggregation and cellular toxicity. In: Metallomics. 2013 ; Vol. 5, No. 11. pp. 1529-1536.
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