Volume 19, Issue 11 e202200342
Research Article

Inhibition of Alzheimer's Aβ1-42 Fibrillogenesis and Removal of Copper Ions by Polypeptides Modified Gold Nanoparticles

Binbin Zhou

Binbin Zhou

College of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, Hunan, 414006 China

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Xingxin Sheng

Xingxin Sheng

College of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, Hunan, 414006 China

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Hao Xie

Hao Xie

College of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, Hunan, 414006 China

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Sisi Zhou

Sisi Zhou

College of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, Hunan, 414006 China

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Ming Zhong

Corresponding Author

Ming Zhong

College of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, Hunan, 414006 China

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An Liu

Corresponding Author

An Liu

College of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, Hunan, 414006 China

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First published: 09 September 2022
Citations: 4

Abstract

Aggregation and fibrillation of β-amyloid peptides (Aβ) as well as accumulation of toxic metal ions have been believed to be the central events to cause Alzheimer's disease (AD). Thus, an attractive therapeutic tactic for AD is to design and synthesize inhibitors and metal chelators to prevent Aβ aggregation and chelate toxic metal ions. In this study, the polypeptide functionalized gold nanoparticles (PFGNP) were obtained by modifying polypeptides Cys-Gly-Gly-Gly-Leu-Pro-Phe-Phe-Asp (CGGGLPFFD) and Cys-Gly-Gly-Gly-Gly-Gly-His (CGGGGGH) onto gold nanoparticles through gold-sulfur bond. The inhibitory properties of PFGNP toward Aβ1-42 fibril formation was assessed by thioflavin T (ThT) fluorescence method and corroborated by atomic force microscopy analysis. The ability of PFGNP to complex copper ions was studied by electrochemical method. The experimental results reveal that PFGNP can effectively chelate copper ions and significantly inhibit the fibrillation of Aβ1-42. Moreover, PFGNP exhibits significantly protective effect on Aβ-induced cytotoxicity toward human neuroblastoma SH-SY5Y cells.

Graphical Abstract

Conflict of interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this article.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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