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Behavioral and EEG changes in male 5xFAD mice.

F Schneider1, K Baldauf1, W Wetzel2

  • 1German Centre for Neurodegenerative Diseases (DZNE), D-39120 Magdeburg, Germany.

Physiology & Behavior
|June 8, 2014
PubMed
Summary

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Male 5xFAD mice exhibit early cognitive and behavioral deficits, including reduced anxiety and impaired learning, making them a valuable model for Alzheimer's disease (AD) research. These findings highlight functional disturbances in male Alzheimer's disease models.

Area of Science:

  • Neuroscience
  • Genetics
  • Animal Models

Background:

  • Transgenic animal models are crucial for studying Alzheimer's disease (AD) pathophysiology and cognitive dysfunction.
  • The 5xFAD mouse model exhibits early amyloid plaque deposition, overexpressing human amyloid precursor protein (APP) and presenilin 1 (PS1).
  • This leads to accelerated accumulation of amyloid-beta (Aβ) peptides, particularly the Aβ42 species.

Purpose of the Study:

  • To investigate the behavioral and functional characteristics of male 5xFAD mice, as most previous studies focused on females.
  • To assess cognitive functions, anxiety levels, and exploratory behavior in male 5xFAD mice.
  • To analyze electroencephalogram (EEG) patterns and sleep architecture in male 5xFAD mice.

Main Methods:

  • Behavioral testing including elevated plus maze, open field exploration, and Morris water maze.
Keywords:
5xFAD miceCognitive deficitsEEGNon-cognitive impairmentsSleep recording

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  • Electroencephalogram (EEG) recordings in awake and sleeping male 5xFAD mice and wild-type controls.
  • Analysis of EEG frequency bands (delta, theta, alpha, beta, gamma, subdelta) and sleep stages (REM sleep).

    • Main Results:

    • Male 5xFAD mice displayed decreased anxiety, reduced locomotion and exploration, and impaired learning and memory starting at 9 months of age.
    • EEG recordings at 6 months showed decreased delta, theta, alpha, beta, and gamma frequencies, with increased subdelta frequency.
    • Reduced rapid eye movement (REM) sleep was observed in relation to total sleep time.

    Conclusions:

    • Male 5xFAD mice develop early functional disturbances and subsequent behavioral deficits relevant to Alzheimer's disease.
    • These findings establish male 5xFAD mice as a suitable model for investigating AD mechanisms.
    • The study underscores the importance of sex-specific characterization in AD mouse models.