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Astrocyte calcium dysfunction causes early network hyperactivity in Alzheimer's disease.

Disha Shah1, Willy Gsell2, Jérôme Wahis3

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Astrocytes dysfunction causes early Alzheimer's disease (AD) network hyperactivity and connectivity issues years before amyloid plaques form. Restoring astrocyte activity reverses these brain changes and related symptoms.

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Area of Science:

  • Neuroscience
  • Neurodegenerative Diseases
  • Astrocyte Biology

Background:

  • Network activity and functional connectivity (FC) dysfunctions are early indicators in Alzheimer's disease (AD).
  • The role of astrocytes, which regulate neuronal activity, in early AD network hyperactivity is not well understood.

Purpose of the Study:

  • To investigate the role of astrocytes in early network hyperactivity and functional connectivity disruptions in Alzheimer's disease.
  • To explore the mechanisms underlying early AD pathogenesis and identify potential therapeutic targets.

Main Methods:

  • Analysis of functional connectivity (FC) in the human cingulate cortex.
  • Utilizing AppNL-F mouse models to study neuronal hyperactivity and astrocyte calcium signaling.
  • Investigating the effects of restoring astrocyte calcium activity on network function and behavior.

Main Results:

  • Increased FC in the human cingulate cortex predates amyloid deposition by several years.
  • AppNL-F mice exhibit early cingulate FC disruption and neuronal hyperactivity.
  • Decreased astrocyte calcium signaling correlates with network disruptions; restoring it normalizes hyperactivity, FC, and behavioral deficits.

Conclusions:

  • Astrocytes play a critical role in mediating early features of Alzheimer's disease.
  • Astrocyte calcium signaling dysfunction contributes to neuronal hyperactivity and network disruptions in AD.
  • Targeting astrocyte activity may offer a therapeutic strategy for early AD intervention.