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Purification and Aggregation of the Amyloid Precursor Protein Intracellular Domain
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FoxO mediates APP-induced AICD-dependent cell death.

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Alzheimer's disease protein APP triggers cell death via its AICD fragment, which interacts with the FoxO protein. This interaction promotes the transcription of cell death genes, highlighting a new pathway in AD pathogenesis.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Alzheimer's disease (AD) pathogenesis is linked to amyloid precursor protein (APP) fragments.
  • Amyloid beta (Aβ) peptides are primary suspects, but the role of APP intracellular domain (AICD) is less understood.

Purpose of the Study:

  • To investigate the role of AICD in APP-induced cell death.
  • To identify downstream mediators of AICD's effects.

Main Methods:

  • Utilized Drosophila models for genetic screening and cell death assays.
  • Investigated protein interactions and nuclear translocation in mammalian cells.
  • Analyzed the transcriptional regulation of pro-apoptotic genes.

Main Results:

  • APP induces AICD-dependent cell death in Drosophila.
  • Forkhead box O (FoxO) transcription factor identified as a key mediator of APP-induced cell death and locomotion defects.
  • AICD interacts with FoxO, co-localizes to the nucleus under oxidative stress, and enhances FoxO-driven transcription of the pro-apoptotic gene Bim.

Conclusions:

  • APP influences cell death through AICD, acting as a transcriptional co-activator for FoxO.
  • This AICD-FoxO pathway represents a novel mechanism in Alzheimer's disease pathology.