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Basic Science and Pathogenesis.

Manvir Lalia1, Stephan Wagner1, Selina Hummel1

  • 1LMU University Hospital, Munich, Germany.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
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In Alzheimer's disease (AD) mouse models, microglia drive increased metabolic connectivity between brain regions. This study identified microglia as key contributors to altered brain communication in AD.

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Area of Science:

  • Neuroscience
  • Molecular Imaging
  • Cellular Biology

Background:

  • Neurodegenerative diseases like Alzheimer's disease (AD) involve complex pathophysiology.
  • Metabolic connectivity, assessed via molecular imaging, shows altered patterns in AD.
  • The cellular origins of these connectivity changes remain unclear.

Purpose of the Study:

  • To identify the cellular sources driving metabolic connectivity changes in an AD mouse model.
  • To compare these sources in AD mice versus wild-type (WT) controls.

Main Methods:

  • PET/MRI imaging with F-18-FDG was used to measure glucose metabolism and metabolic connectivity.
  • Brain cells (microglia, astrocytes, oligodendrocytes, neurons) were isolated for cell-specific uptake analysis.
  • Correlation analyses were performed between regional and cellular FDG uptake.

Main Results:

  • AD mice showed higher overall FDG uptake and increased forebrain-hindbrain metabolic connectivity.
  • Microglia exhibited the highest single-cell FDG uptake and were significantly correlated with metabolic connectivity.
  • In AD mice, microglia, astrocytes, and oligodendrocytes had increased uptake, while neurons had reduced uptake.

Conclusions:

  • Microglia are the primary drivers of altered forebrain-hindbrain metabolic connectivity in this AD mouse model.
  • Further research into microglial gene expression could elucidate underlying molecular mechanisms.