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Related Experiment Videos

Physical training modifies the age-related decrease of GAP-43 and synaptophysin in the hippocampal formation in

Y C Chen1, Q S Chen, J L Lei

  • 1Department of Anatomy, Beijing Medical University, Beijing 100083, China. any@mail.bjmu.edu.cn

Brain Research
|September 18, 1998
PubMed
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Prolonged physical training in mice counteracted age-related declines in hippocampal growth-associated protein 43 (GAP-43) and synaptophysin. This exercise-induced increase in key synaptic proteins suggests enhanced neuroplasticity and synaptogenesis.

Area of Science:

  • Neuroscience
  • Aging Research
  • Exercise Physiology

Background:

  • Aging is associated with a decline in synaptic plasticity and the expression of key proteins like GAP-43 and synaptophysin in the hippocampus.
  • Understanding factors that can mitigate age-related neural changes is crucial for promoting healthy aging.

Purpose of the Study:

  • To investigate the impact of long-term, moderate physical training on the expression of GAP-43 and synaptophysin in the mouse hippocampal formation.
  • To determine if physical activity can reverse or attenuate age-related decreases in these synaptic markers.

Main Methods:

  • C57BL/6J mice were divided into trained, sedentary, and young control groups.
  • The trained group engaged in voluntary running wheel exercise for 1 hour daily, 5 days a week, for 21 months.

Related Experiment Videos

  • Immunohistochemistry and image analysis quantified GAP-43 and synaptophysin densities in hippocampal subregions (CA1, CA3, dentate gyrus).

    • Main Results:

    • Sedentary mice showed significantly decreased densities of GAP-43 and synaptophysin compared to young mice.
    • Trained mice exhibited significantly increased densities of GAP-43 and synaptophysin in hippocampal regions compared to age-matched sedentary controls.
    • These increases were observed in the CA1, CA3, and dentate gyrus areas.

    Conclusions:

    • Moderate, prolonged physical training can modify the age-related decrease in GAP-43 and synaptophysin expression in the hippocampus.
    • The enhanced expression of these proteins suggests that physical activity promotes anatomical sprouting and synaptogenesis, contributing to neural health during aging.