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

H. Fu, W. Li, J. Luo, N.T.K. Lee, M. Li, K.W.K. Tsim, Y. Pang, M.B.H. Youdim, Yifan Han

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

The regulation of alpha-, beta-, (BACE-1), and gamma-secretase activities to alter P-amyloid (A beta) 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 A beta generation were investigated. Bis(7)-tacrine (0.1-3 mu M) substantially reduced the amounts of both secreted and intracellular A beta in Ncuro2a APPswe cells without altering the expression of APP. sAPP alpha and CTF alpha increased, while sAPP beta and CTF beta decreased significantly in Neuro2a APPswe cells following the treatment with bis(7)-tacrine, indicating that bis(7)-tacrine might activate a-secretase and/or inhibit BACE-I 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 IC(50) of 7.5 mu M, but did not directly affect activities of BACE-2, Cathepsin D, alpha- or gamma-secretase. Taken together, our results not only suggest that bis(7)-tacrine may reduce the biosynthesis of A beta mainly by directly inhibiting BACE-I activity, but also provide new insights into the rational design of novel anti-Alzheimer's dimers that might have disease-modifying properties.
Original languageEnglish
Pages (from-to)631-636
Number of pages6
JournalBiochemical and Biophysical Research Communications
Volume366
Issue number3
DOIs
Publication statusPublished - 2008

Keywords

  • Bis(7)-tacrine
  • A beta
  • APP
  • BACE-1
  • Alpha-secretase

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Cell Biology
  • Molecular Biology

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