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Basic Science and Pathogenesis.

Shreyan Kancharla1, Pattie Lamb2, Jerrel Yakel2

  • 1North Carolina Central University, Durham, NC, USA.

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|December 23, 2025
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Summary

The APOE4 gene variant impairs brain cholinergic signaling and reduces neuron counts in mice, potentially worsening Alzheimer's disease progression.

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Area of Science:

  • Neuroscience
  • Genetics
  • Alzheimer's Disease Research

Background:

  • Alzheimer's disease (AD) involves amyloid-beta and tau pathologies, with cholinergic signaling deficits contributing to cognitive decline.
  • APOE4 is the primary genetic risk factor for sporadic AD, but its precise impact on brain function remains under investigation.
  • Cholinergic system dysfunction is linked to cognitive impairments and early symptoms in Alzheimer's disease.

Purpose of the Study:

  • To investigate the effects of the APOE4 gene on cholinergic signaling pathways in the brain.
  • To determine how APOE4 influences neuronal integrity and receptor expression in key brain regions.
  • To explore the relationship between APOE4, amyloid-beta accumulation, and cholinergic neuron function.

Main Methods:

  • Comparative analysis of brain tissue from 12-month-old female APOE3 and APOE4 knock-in mice.
  • Quantification of neuronal populations using Nissl staining and immunohistochemistry.
  • Assessment of alpha7 nicotinic acetylcholine receptor (α7 nAChR) mRNA expression via RNAscope multiplex assays.

Main Results:

  • APOE4 mice showed a significant reduction in septal cholinergic neurons and widespread hippocampal neuronal loss.
  • A marked decrease in α7 nAChR mRNA expression was observed in specific neuronal populations within the hippocampus of APOE4 mice.
  • Elevated intracellular amyloid-beta levels were detected in the dentate neurons of both APOE4 and α7 nAChR knockout mice.

Conclusions:

  • APOE4 genotype is associated with impaired cholinergic signaling and neuronal loss in mice.
  • These deficits may lead to disinhibition and hyperexcitability of glutamatergic neurons, potentially accelerating Alzheimer's disease pathogenesis.
  • Findings highlight the critical role of APOE4 in cholinergic dysfunction and its implications for Alzheimer's disease progression.