Disruption of the grid cell network in a mouse model of early Alzheimer’s disease

Johnson Ying, Alexandra T. Keinath, Raphael Lavoie, Erika Vigneault, Salah El Mestikawy and Mark P. Brandon ()
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Johnson Ying: McGill University
Alexandra T. Keinath: McGill University
Raphael Lavoie: McGill University
Erika Vigneault: McGill University
Salah El Mestikawy: McGill University
Mark P. Brandon: McGill University

Nature Communications, 2022, vol. 13, issue 1, 1-13

Abstract: Abstract Early-onset familial Alzheimer’s disease (AD) is marked by an aggressive buildup of amyloid beta (Aβ) proteins, yet the neural circuit operations impacted during the initial stages of Aβ pathogenesis remain elusive. Here, we report a coding impairment of the medial entorhinal cortex (MEC) grid cell network in the J20 transgenic mouse model of familial AD that over-expresses Aβ throughout the hippocampus and entorhinal cortex. Grid cells showed reduced spatial periodicity, spatial stability, and synchrony with interneurons and head-direction cells. In contrast, the spatial coding of non-grid cells within the MEC, and place cells within the hippocampus, remained intact. Grid cell deficits emerged at the earliest incidence of Aβ fibril deposition and coincided with impaired spatial memory performance in a path integration task. These results demonstrate that widespread Aβ-mediated damage to the entorhinal-hippocampal circuit results in an early impairment of the entorhinal grid cell network.

Date: 2022
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DOI: 10.1038/s41467-022-28551-x

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