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Abid Hussaini1,2, Gustavo A Rodriguez2, Radha Raghuraman2

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Alzheimer's disease impairs brain circuits, causing significant memory and navigation deficits. This study reveals how amyloid-beta accumulation disrupts neuronal networks in the entorhinal cortex, offering insights into cognitive decline.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience

Background:

  • Alzheimer's disease (AD) is a progressive neurodegenerative disorder.
  • Amyloid-beta (Aβ) accumulation and neuroinflammation disrupt neural circuits, especially in memory-related areas like the entorhinal cortex (MEC/LEC).
  • These regions are crucial for spatial navigation and memory encoding, making them vulnerable to early AD pathology.

Purpose of the Study:

  • To investigate neurophysiological changes in the entorhinal cortex during Alzheimer's disease pathogenesis.
  • To understand how AD-related pathology affects neuronal ensemble activity and spatial information processing.

Main Methods:

  • Used in vivo electrophysiology in App NL-G-F knock-in (APP KI) and EC-App/Tau mouse models.
  • Recorded single-unit activity in open field tasks, analyzing spatial information scores, Earth Mover's Distance (EMD), and spatial decoding.
  • Examined neuronal firing characteristics of specific cell types like border and grid cells.

Main Results:

  • APP KI mice showed reduced spatial information encoding in the medial entorhinal cortex (MEC).
  • MEC border and grid cells exhibited unstable firing patterns, disrupting spatial representation.
  • The lateral entorhinal cortex (LEC) displayed hyperactive neuronal populations with decreased information content and precision.

Conclusions:

  • AD pathology induces significant neurophysiological disruptions in entorhinal cortical networks.
  • Altered neuronal dynamics impair spatial and contextual encoding, contributing to cognitive decline in AD.
  • Understanding these circuit-level dysfunctions is key for developing targeted therapeutic interventions for AD.