The role of β-catenin stability in mutant PS1-associated apoptosis

Conrad C. Weihl, Richard J. Miller, Raymond P. Roos

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

Most early onset cases of familial Alzheimer's disease (FAD) are caused by mutations in presenilin-1 (PS1) and presenilin-2 (PS2). These mutations lead to increased β-amyloid formation and induce apoptosis when expressed in vitro. Recently, PS1 has been reported to associate with β-catenin, an armadillo repeat protein. PS1 may regulate the function of β-catenin, and mutant PS1 may disrupt this regulation. In the present study, we confirm that PS1-WT, as well as mutant PS1-associates with β-catenin, and that mutant PS1 expression decreases the stability and/or enhances the degradation of β- catenin. Most importantly, we correlate β-catenin's destabilization with mutant PS1-associated apoptosis by administering drugs that alter the stability of β-catenin. The application of LiCl and a proteasome inhibitor, N-acetyl-leu-leu-norleucinal (ALLN), increased the stability of cytosolic β- catenin in mutant PS1-expressing cells leading to rescue of these cells from apoptosis. These studies suggest that β-catenin is a key mediator of mutant PS1-associated apoptosis and EAD pathogenesis.

Original languageEnglish
Pages (from-to)2527-2532
Number of pages6
JournalNeuroReport
Volume10
Issue number12
DOIs
StatePublished - Aug 20 1999

Keywords

  • Alzheimer's disease
  • Apoptosis
  • Presenilin-1
  • Replication deficient recombinant adenoviral vector
  • β-Catenin

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