Induction of Dickkopf-1, a negative modulator of the Wnt pathway, is associated with neuronal degeneration in Alzheimer's brain

Andrea Caricasole, Agata Copani, Filippo Caraci, Eleonora Aronica, Annemieke J. Rozemuller, Alessandra Caruso, Marianna Storto, Giovanni Gaviraghi, Georg C. Terstappen, Ferdinando Nicoletti

Research output: Contribution to journalArticle

Abstract

We used primary cultures of cortical neurons to examine the relationship between β-amyloid toxicity and hyperphosphorylation of the tau protein, the biochemical substrate for neurofibrillary tangles of Alzheimer's brain. Exposure of the cultures to β-amyloid peptide (βAP) induced the expression of the secreted glycoprotein Dickkopf-1 (DKK1). DKK1 negatively modulates the canonical Wnt signaling pathway, thus activating the tau-phosphorylating enzyme glycogen synthase kinase-3β. DKK1 was induced at late times after βAP exposure, and its expression was dependent on the tumor suppressing protein p53. The antisense induced knock-down of DKK1 attenuated neuronal apoptosis but nearly abolished the increase in tau phosphorylation in βAP-treated neurons. DKK1 was also expressed by degenerating neurons in the brain from Alzheimer's patients, where it colocalized with neurofibrillary tangles and distrophic neurites. We conclude that induction of DKK1 contributes to the pathological cascade triggered by β-amyloid and is critically involved in the process of tau phosphorylation.

Original languageEnglish
Pages (from-to)6021-6027
Number of pages7
JournalJournal of Neuroscience
Volume24
Issue number26
DOIs
Publication statusPublished - Jun 30 2004

Keywords

  • β-amyloid
  • Alzheimer's disease
  • Apoptosis
  • Dickkopf-1
  • Tau phosphorylation
  • Wnt pathway

ASJC Scopus subject areas

  • Neuroscience(all)

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