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Localized APP expression results in progressive network dysfunction by disorganizing spike timing.

Silvia Viana da Silva1, Matthias G Haberl2, Kshitij Gaur3

  • 1Neurobiology Department, School of Biological Sciences, University of California, San Diego, La Jolla, CA, USA; NeuroCure Excellence Cluster and German Center for Neurodegenerative Diseases (DZNE), Berlin, Germany.

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Summary

Localized Alzheimer's pathology in the hippocampus (CA3) impairs memory and disrupts neuronal activity in connected regions (CA1). This suggests disease progression involves physiological dysfunction, not solely spreading molecular damage.

Keywords:
Alzheimer’s diseaseamyloid precursor proteinhippocampusphase precessionspike timingtheta oscillations

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Area of Science:

  • Neuroscience
  • Pathology
  • Molecular Biology

Background:

  • Alzheimer's disease (AD) involves progressive cognitive decline.
  • The underlying pathology, whether spreading or focal, remains debated.
  • Aberrant neuronal activity is a hallmark of AD.

Purpose of the Study:

  • To investigate if focal pathology in Alzheimer's disease can cause network dysfunction.
  • To differentiate between spreading pathology and network dysfunction as drivers of AD progression.

Main Methods:

  • Generated a mouse model with mutant human amyloid precursor protein (APP) specifically in hippocampal CA3 cells.
  • Assessed hippocampus-dependent memory performance in mutant and wild-type mice.
  • Recorded neuronal activity (theta oscillation frequency and principal cell timing) in the CA1 region.

Main Results:

  • Mutant mice exhibited impaired performance in memory tasks.
  • Reduced theta oscillation frequency and disrupted principal cell timing were observed in the CA1 region of mutant mice.
  • These effects were present in both young adult and aged mice.

Conclusions:

  • Highly localized, presynaptic pathology (in CA3) is sufficient to induce aberrant firing patterns in postsynaptic neuronal networks (in CA1).
  • Alzheimer's disease progression is influenced by advancing physiological dysfunction, in addition to spreading pathology.
  • This finding offers new insights into the mechanisms driving Alzheimer's disease progression.