Amyloid-β Oligomers May Impair SNARE-Mediated Exocytosis by Direct Binding to Syntaxin 1a

Yoosoo Yang, Jaewook Kim, Hye Yun Kim, Nayeon Ryoo, Sejin Lee, Young Soo Kim, Hyewhon Rhim, Yeon Kyun Shin

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20 Citations (Scopus)

Abstract

Alzheimer's disease (AD) is closely associated with synaptic dysfunction, and thus current treatments often aim to stimulate neurotransmission to improve cognitive impairment. Whereas the formation of the soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) complex is essential for synaptic transmission, the correlation between SNAREs and AD neuropathology is unknown. Here, we report that intracellular amyloid-β (Aβ) oligomers directly inhibit SNARE-mediated exocytosis by impairing SNARE complex formation. We observe abnormal reduction of SNARE complex levels in the brains of APP/PS1 transgenic (TG) mice compared to age-matched wild-types. We demonstrate that Aβ oligomers block SNARE complex assembly through the direct interaction with a target membrane (t)-SNARE syntaxin 1a in vitro. Furthermore, the results of the in vitro single-vesicle content-mixing assay reveal that Aβ oligomers inhibit SNARE-mediated fusion pores. Thus, our study identifies a potential molecular mechanism by which intracellular Aβ oligomers hamper SNARE-mediated exocytosis, likely leading to AD-associated synaptic dysfunctions.

Original languageEnglish
Article number1940
Pages (from-to)1244-1251
Number of pages8
JournalCell Reports
Volume12
Issue number8
DOIs
Publication statusPublished - 2015 Aug 25

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)

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    Yang, Y., Kim, J., Kim, H. Y., Ryoo, N., Lee, S., Kim, Y. S., Rhim, H., & Shin, Y. K. (2015). Amyloid-β Oligomers May Impair SNARE-Mediated Exocytosis by Direct Binding to Syntaxin 1a. Cell Reports, 12(8), 1244-1251. [1940]. https://doi.org/10.1016/j.celrep.2015.07.044