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Related Experiment Video

Updated: Mar 14, 2026

Immunohistochemical Visualization of Hippocampal Neuron Activity After Spatial Learning in a Mouse Model of Neurodevelopmental Disorders
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APOE-Sensitive Cholinergic Sprouting Compensates for Hippocampal Dysfunctions Due to Reduced Entorhinal Input.

Jean-Bastien Bott1, Céline Héraud1, Brigitte Cosquer1

  • 1Laboratoire de Neurosciences Cognitives et Adaptatives, Centre National de la Recherche Scientifique-Unité Mixte de Recherche 7364, Neuropôle de Strasbourg Groupement De Recherche Européen/Centre National de la Recherche Scientifique 2905, F-67000 Strasbourg, France; and Université de Strasbourg, F-67000 Strasbourg, France.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|October 7, 2016
PubMed
Summary
This summary is machine-generated.

Brain repair mechanisms, like cholinergic sprouting, can compensate for entorhinal cortex lesions, improving spatial memory in early Alzheimer's disease (AD). Impaired sprouting in APOE4 carriers may worsen cognitive decline, suggesting new therapeutic targets beyond amyloid.

Keywords:
APOE4Alzheimer's diseasecholinergic sproutingentorhinal cortexhippocampal disconnectionspatial memory

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Area of Science:

  • Neuroscience
  • Neurodegenerative Diseases
  • Alzheimer's Disease Pathogenesis

Background:

  • Alzheimer's disease (AD) and mild cognitive impairment (MCI) involve entorhinal cortex (EC) neuronal loss, leading to hippocampal disconnection and cognitive deficits.
  • Cholinergic sprouting in the hippocampus is hypothesized to compensate for reduced EC glutamatergic input, but direct evidence is lacking.
  • The APOE4 allele, a major risk factor for AD, impairs cholinergic sprouting in transgenic mouse models.

Purpose of the Study:

  • To investigate the compensatory role of cholinergic sprouting in response to EC lesions.
  • To explore the mechanisms underlying EC lesion-induced spatial memory deficits and network hyperactivity.
  • To determine the impact of the APOE4 allele on cholinergic sprouting and functional compensation.

Main Methods:

  • Utilized transgenic mice expressing the human APOE4 allele to model impaired cholinergic sprouting.
  • Induced partial EC lesions and assessed spatial memory deficits and hippocampal-entorhinal network activity.
  • Employed optogenetics to stimulate cholinergic fibers and modulate dentate network hyperactivity.

Main Results:

  • Cholinergic sprouting was found to be necessary and sufficient for acute compensation of EC lesion-induced spatial memory deficits.
  • Partial EC lesions induced abnormal hyperactivity in EC/dentate networks, which was ameliorated by cholinergic stimulation.
  • APOE4 expression impaired cholinergic sprouting, correlating with deficits in compensatory mechanisms.

Conclusions:

  • Cholinergic sprouting plays a critical role in the acute functional compensation of EC lesions, potentially by controlling dentate hyperactivity.
  • Impaired cholinergic sprouting in APOE4 carriers may contribute to accelerated cognitive decline in MCI and AD.
  • Targeting cholinergic pathways and addressing dentate hyperactivity represent potential therapeutic strategies for AD.