Deletion of the γ-secretase subunits Aph1B/C impairs memory and worsens the deficits of knock-in mice modeling the Alzheimer-like familial Danish dementia

Fabrizio Biundo, Keita Ishiwari, Dolores Del Prete, Luciano D'Adamio

Research output: Contribution to journalArticle

3 Scopus citations


Mutations in BRI2/ITM2b genes cause Familial British and Danish Dementias (FBD and FDD), which are pathogenically similar to Familial Alzheimer Disease (FAD). BRI2 inhibits processing of Amyloid precursor protein (APP), a protein involved in FAD pathogenesis. Accumulation of a carboxyl-terminal APP metabolite -β-CTF- causes memory deficits in a knock-in mouse model of FDD, called FDDKI. We have investigated further the pathogenic function of β-CTF studying the effect of Aph1B/C deletion on FDDKI mice. This strategy is based on the evidence that deletion of Aph1B/C proteins, which are components of the γ-secretase that cleaves β-CTF, results in stabilization of β-CTF and a reduction of Aβ. We found that both the FDD mutation and the Aph1B/C deficiency mildly interfered with spatial long term memory, spatial working/short-term memory and long-term contextual fear memory. In addition, the Aph1BC deficiency induced deficits in long-term cued fear memory. Moreover, the two mutations have additive adverse effects as they compromise the accuracy of spatial long-term memory and induce spatial memory retention deficits in young mice. Overall, the data are consistent with a role for β-CTF in the genesis of memory deficits.

Original languageEnglish (US)
Pages (from-to)11923-11944
Number of pages22
Issue number11
StatePublished - Mar 15 2016



  • Alzheimer
  • APP
  • Danish dementia
  • Gamma-secretase
  • Gerotarget
  • Itm2b-bri2

ASJC Scopus subject areas

  • Oncology

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