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Amyloid-β Modulates Both AβPP and Tau Phosphorylation.

Joana M Oliveira1, Ana Gabriela Henriques, Filipa Martins

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Alzheimer's disease research reveals amyloid-beta (Aβ) impacts amyloid-beta precursor protein (AβPP) phosphorylation at Thr668. This suggests Aβ influences AβPP processing and tau phosphorylation, linking key disease pathologies.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Alzheimer's disease (AD) is characterized by neurofibrillary tangles (tau) and amyloid plaques (Aβ).
  • Aβ is implicated in altered kinase/phosphatase activity, affecting tau phosphorylation.
  • Amyloid-beta precursor protein (AβPP) is hyperphosphorylated at residues like Thr668 in AD brains.

Purpose of the Study:

  • To investigate the direct effect of Aβ(42) on AβPP phosphorylation at Thr668.
  • To identify kinases and phosphatases involved in AβPP phosphorylation/dephosphorylation at Thr668.
  • To explore the link between Aβ, AβPP phosphorylation, and tau phosphorylation.

Main Methods:

  • Primary cortical neuron cultures.
  • Treatment with Aβ(42) peptide.
  • Analysis of AβPP phosphorylation at Thr668.
  • Assays for kinase (GSK3β, Cdk5) and phosphatase (PP1, PP2B) activity.

Main Results:

  • Aβ(42) significantly impacts AβPP phosphorylation at the Thr668 residue.
  • GSK3β and Cdk5 mediate AβPP phosphorylation at Thr668.
  • PP1 and PP2B are involved in AβPP dephosphorylation at Thr668.
  • Aβ(42) increases tau phosphorylation at Ser396 and Ser262.

Conclusions:

  • Aβ(42) directly modulates AβPP phosphorylation at Thr668, suggesting a feedback loop in Aβ production.
  • Kinases GSK3β and Cdk5, and phosphatases PP1 and PP2B, are key players in regulating AβPP phosphorylation.
  • Aβ promotes cross-talk between signaling pathways, leading to hyperphosphorylation of both AβPP and tau.
  • Aβ's effect on kinases and phosphatases offers a potential mechanism linking Aβ and tau pathology in AD.