Promising anti-Alzheimer's dimer bis(7)-tacrine reduces β-amyloid generation by directly inhibiting BACE-1 activity

Hongjun Fu, Wenming Li, Jialie Luo, Nelson T.K. Lee, Mingtao Li, Karl W.K. Tsim, Yuanping Pang, Moussa B.H. Youdim, Yifan Han

Research output: Contribution to journalArticle

54 Scopus citations

Abstract

The regulation of α-, β-, (BACE-1), and γ-secretase activities to alter β-amyloid (Aβ) generation is considered to be one of the most promising disease-modifying therapeutics for Alzheimer's disease. In this study, the effect and mechanisms of bis(7)-tacrine (a promising anti-Alzheimer's dimer) on Aβ generation were investigated. Bis(7)-tacrine (0.1-3 μM) substantially reduced the amounts of both secreted and intracellular Aβ in Neuro2a APPswe cells without altering the expression of APP. sAPPα and CTFα increased, while sAPPβ and CTFβ decreased significantly in Neuro2a APPswe cells following the treatment with bis(7)-tacrine, indicating that bis(7)-tacrine might activate α-secretase and/or inhibit BACE-1 activity. Furthermore, bis(7)-tacrine concentration-dependently inhibited BACE-1 activity in cultured cells, and also in recombinant human BACE-1 in a non-competitive manner with an IC50 of 7.5 μM, but did not directly affect activities of BACE-2, Cathepsin D, α- or γ-secretase. Taken together, our results not only suggest that bis(7)-tacrine may reduce the biosynthesis of Aβ mainly by directly inhibiting BACE-1 activity, but also provide new insights into the rational design of novel anti-Alzheimer's dimers that might have disease-modifying properties.

Original languageEnglish (US)
Pages (from-to)631-636
Number of pages6
JournalBiochemical and Biophysical Research Communications
Volume366
Issue number3
DOIs
StatePublished - Feb 15 2008

Keywords

  • APP
  • BACE-1
  • Bis(7)-tacrine
  • α-Secretase

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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