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Basic Science and Pathogenesis.

Deniz Ghaffari1, Jennifer K Griffin1, Ye Zhou1

  • 1University of Toronto, Toronto, ON, Canada.

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This summary is machine-generated.

Microglia TREM2 signaling differs between mouse strains, impacting Alzheimer's disease (AD) pathology. ABI3 deletion effects in AD models may depend on these TREM2 pathway variations.

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Area of Science:

  • Neuroscience
  • Immunology
  • Genetics

Background:

  • Alzheimer's disease (AD) is a leading cause of dementia with no effective treatments.
  • Microglia, immune cells in the brain, are implicated in AD pathogenesis due to associated genetic variants.
  • Conflicting results exist regarding the role of ABI3 deletion in AD mouse models, suggesting underlying biological differences.

Purpose of the Study:

  • To investigate the impact of genetic background differences on TREM2 signaling in microglia.
  • To explore how altered TREM2 signaling in different microglial populations may explain discrepancies in ABI3 deletion studies for AD.
  • To identify potential therapeutic targets by understanding the interplay between TREM2 and ABI3 in AD.

Main Methods:

  • Primary microglia from C57 and SJL mice were used.
  • TREM2 cleavage was measured by ELISA.
  • TREM2 signaling pathway components (SYK, PLCG2) were analyzed via western blotting after anti-TREM2 antibody stimulation.
  • Amyloid-beta phagocytosis by microglia was assessed using live imaging.

Main Results:

  • SJL microglia exhibited significantly lower TREM2 cleavage compared to C57 microglia.
  • Stimulation of SJL microglia with an anti-TREM2 antibody resulted in attenuated SYK and PLCG2 phosphorylation.
  • SJL microglia showed reduced amyloid-beta phagocytosis compared to C57 microglia, indicating impaired TREM2 function.

Conclusions:

  • TREM2 signaling and AD-related functions are significantly altered in SJL microglia.
  • Differences in TREM2 signaling between microglial populations may explain conflicting AD phenotypes observed in ABI3-deficient mouse models.
  • Further research aims to elucidate the molecular link between TREM2 and ABI3 to develop novel AD therapeutics.