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Related Experiment Video

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Age dependent path integration deficit in 5xFAD mice.

Kendall D Mar1, Chanbee So2, Yixin Hou2

  • 1Department of Psychology, University of Toronto, 100 St. George Street, Sidney Smith Hall, Toronto, Ontario M5S 3G3, Canada.

Behavioural Brain Research
|February 26, 2024
PubMed
Summary

Path integration (PI) may serve as an early Alzheimer's disease (AD) marker. Early amyloid-beta vulnerability in key brain regions correlates with spatial memory deficits in mouse models.

Keywords:
5xFADAlzheimer’s diseasePapez circuitegocentric navigationmammillary bodiespath integration

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Area of Science:

  • Neuroscience
  • Dementia Research
  • Alzheimer's Disease Pathophysiology

Background:

  • Alzheimer's disease (AD) is a leading cause of dementia, marked by cognitive decline.
  • Identifying preclinical AD markers is crucial for early intervention.
  • Spatial memory and navigation are often impaired in AD patients.

Purpose of the Study:

  • To investigate path integration (PI) as a potential preclinical marker for Alzheimer's disease (AD).
  • To explore the role of the Papez circuit in PI deficits in AD mouse models.
  • To assess early neuropathological changes in relation to behavioral impairments.

Main Methods:

  • Utilized an ultrasound-evoked spatial memory assay in C57BL/6J and 5xFAD mice.
  • Measured immediate early gene c-Fos expression in brain regions like the mammillary bodies (MB) and subiculum (Sub).
  • Assessed amyloid-beta (Aβ) deposition and behavioral performance at different ages.

Main Results:

  • C57BL/6J mice showed MB and Sub recruitment during PI, indicated by c-Fos expression.
  • 5xFAD mice exhibited early Aβ vulnerability in MB and Sub at 3 months, preceding widespread pathology.
  • Significant PI behavioral deficits were observed in 5xFAD mice at 5 months, more pronounced in males.

Conclusions:

  • Path integration (PI) shows promise as an early indicator of Alzheimer's disease (AD).
  • Dysfunction in the Papez circuit, specifically MB and Sub, is associated with early AD-related PI deficits.
  • Sex-based differences in PI deficits warrant further investigation in AD research.