Amphiphysin i cleavage by asparagine endopeptidase leads to tau hyperphosphorylation and synaptic dysfunction
eLife, ISSN: 2050-084X, Vol: 10
2021
- 12Citations
- 10Captures
- 1Mentions
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- Citations12
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- 12
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- Captures10
- Readers10
- 10
- Mentions1
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Amphiphysin I cleavage by asparagine endopeptidase leads to tau hyperphosphorylation and synaptic dysfunction.
Elife. 2021 May 21;10 Authors: Zhang X, Zou L, Meng L, Xiong M, Pan L, Chen G, Zheng Y, Xiong J, Wang Z, Duong DM, Zhang Z, Cao X, Wang T, Tang L, Ye K, Zhang Z PubMed: 34018922 Submit Comment
Article Description
Neurofibrillary tangles composed of hyperphosphorylated tau and synaptic dysfunction are characteristics of Alzheimer’s disease (AD). However, the underlying molecular mechanisms remain poorly understood. Here, we identified Amphiphysin I mediates both tau phosphorylation and synaptic dysfunction in AD. Amphiphysin I is cleaved by a cysteine proteinase asparagine endopeptidase (AEP) at N278 in the brains of AD patients. The amount of AEP-generated N-terminal fragment of Amphiphysin I (1-278) is increased with aging. Amphiphysin I (1-278) inhibits clathrin-mediated endocytosis and induces synaptic dysfunction. Furthermore, Amphiphysin I (1-278) binds p35 and promotes its transition to p25, thus activates CDK5 and enhances tau hyperphosphorylation. Overexpression of Amphiphysin I (1-278) in the hippocampus of Tau P301S mice induces synaptic dysfunction, tau hyperphosphorylation, and cognitive deficits. However, overexpression of the N278A mutant Amphiphysin I, which resists the AEP-mediated cleavage, alleviates the pathological and behavioral defects. These findings suggest a mechanism of tau hyperphosphorylation and synaptic dysfunction in AD.
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eLife Sciences Publications, Ltd
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