Active Immunotherapy with 12-mer Aβ1-42-like Assembly Vaccine Shows Efficacy in Aged 3×Tg-AD Mice

Author(s): Hao Fang, Guo Zhou, Qingli Li, Haichao Wang, Xiaobin Pang, Qing Xu*, Yunzhou Yu*

Journal Name: Current Molecular Medicine

Volume 21 , Issue 1 , 2021

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Background: Alzheimer's disease (AD) is the most common progressive neurodegenerative disorder characterized by senile plaques and neurofibrillary tangles (NFTs). The amyloid-oligomer hypothesis indicates that the buildup of toxic oligomers in vivo is likely to impair memory and synaptic function.

Methods: In our study, a kind of novel recombinant chimeric 12×(Aβ1-15-Th) antigen was developed as 12-mer Aβ1-42-like assembly vaccine. We designed this 12×(Aβ1-15- Th) antigen to mimic the assembly states of Aβ1-42 using twelvefold Aβ1–15 (B cell epitopes of human Aβ1-42) and foreign human T helper (Th) epitopes (as the T cell epitopes of Aβ1-42) constructs. Its immunogenicity as a subunit vaccine was tested on C57/BL6 mice, and the efficacy was shown by applying it to AD mice.

Results: This 12×(Aβ1-15-Th) vaccine induced robust Aβ-specific antibodies in 3×Tg- AD and C57/BL6 mice. As early immunotherapeutic agent of AD, the 12×(Aβ1-15-Th) vaccine significantly improved the behavior performance of aged 3 × Tg-AD mice, and reduced the levels of soluble Aβ oligomers and soluble Aβ in the brain. In aged 3 × Tg- AD mice, immunotherapy with the 12×(Aβ1-15-Th) vaccine could prevent Aβ-induced decrease of synaptic proteins, which suggested that it had neuroprotective effects on the brain.

Conclusion: The novel recombinant 12×(Aβ1-15-Th) chimeric vaccine targeting of pathological conformations of Aβ oligomers has shown obvious neuroprotective benefits in the preclinical AD model mouse, which indicates that it is a good candidate vaccine for the prophylaxis of AD.

Keywords: Alzheimer's disease, Amyloid-β, Chimeric vaccine, Immunotherapy, Calpain, Synaptic protein.

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Article Details

Year: 2021
Published on: 18 March, 2021
Page: [45 - 55]
Pages: 11
DOI: 10.2174/1566524020666200427101231
Price: $65

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