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Basic Science and Pathogenesis.

Danielle Cozachenco1, Ricardo A S Lima-Filho1, Mariana Chauvet1

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Alzheimer's disease (AD) pathology involves amyloid-beta oligomers (AβOs) and tau oligomers (TauOs). In microglia, these toxins did not alter protein synthesis via eIF2α-P, suggesting other pathways are involved in AD.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Alzheimer's disease (AD) is characterized by neurofibrillary tangles (tau protein) and amyloid-beta (Aβ) peptide aggregates.
  • Soluble Aβ oligomers (AβOs) and tau oligomers (TauOs) are implicated in AD pathogenesis.
  • Aβ and tau aggregates impair neuronal mRNA translation via eIF2α-P, leading to cognitive decline.

Purpose of the Study:

  • To investigate the regulation of protein synthesis in microglia in the context of Alzheimer's disease.
  • To determine the effects of AβOs and TauOs on microglial protein synthesis and homeostasis.

Main Methods:

  • Analysis of protein synthesis regulation in postmortem AD brains.
  • Primary microglia cultures were exposed to AβOs or TauOs.

Main Results:

  • Increased eIF2α-P levels in AD prefrontal cortex, associated with CERAD and Braak stages.
  • Differential association of eIF2α-P with CERAD and Braak stages in AD hippocampus.
  • No significant changes in eIF2α-P, ATF4, or global protein synthesis rates in microglia exposed to AβOs or TauOs at 6 or 24 hours.
  • AβOs increased CX3CR1 levels and showed a trend for increased HMGB1 in microglia.

Conclusions:

  • Microglial eIF2α-P and downstream signaling are not affected by AβOs or TauOs exposure.
  • Further research is needed to identify alternative mechanisms regulating mRNA translation in AD microglia.