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Treadmill exercise overcomes memory deficits related to synaptic plasticity through modulating ionic glutamate
Baixia Li1, Qian Mao1, Na Zhao1
1School of Physical Education and Health Care, East China Normal University, Shanghai, China; Key Laboratory of Adolescent Health Assessment and Exercise Intervention of Ministry of Education, East China Normal University, Shanghai, China.
Regular exercise in Alzheimer's disease (AD) models reduced beta-amyloid (Aβ) plaques and improved cognitive function. Exercise also enhanced synaptic plasticity and normalized glutamate receptor function, suggesting a therapeutic benefit for AD.
Area of Science:
- Neuroscience
- Pathology
- Exercise Physiology
Background:
- Alzheimer's disease (AD) is characterized by neuronal death and synaptic loss, potentially linked to abnormal ionic glutamate receptors.
- Beta-amyloid (Aβ) peptides impair synaptic efficacy and plasticity, contributing to neurodegeneration in AD.
Purpose of the Study:
- To investigate if exercise can ameliorate AD pathology by examining changes in ionic glutamate receptors.
- To assess the impact of treadmill exercise on cognitive function, Aβ levels, and synaptic plasticity in a mouse model of AD.
Main Methods:
- Transgenic APP/PS1 mice and wild-type littermates were divided into control and exercise groups.
- Exercise groups underwent 12 weeks of treadmill training.
- Evaluated spatial learning, memory, Aβ content, amyloid deposition, synapse number, postsynaptic density (PSD) dimensions, and levels of synaptic plasticity proteins and glutamate receptor subunits.
Main Results:
- Twelve weeks of exercise improved spatial learning and memory in TgAPP/PS1 mice.
- Exercise reduced hippocampal Aβ40, Aβ42 levels, and amyloid plaque deposition.
- Exercise increased synapse number, PSD length/thickness, and restored levels of synaptic plasticity proteins (SYN, PSD95, MAP2, NCAM) and glutamate receptor subunits (GluN2B, GluA1) in TgAPP/PS1 mice.
Conclusions:
- Treadmill exercise mitigates cognitive decline in a mouse model of AD by reducing Aβ burden in the hippocampus.
- Exercise-induced improvements in synaptic structural plasticity and excitatory neurotransmission may underlie the cognitive benefits observed in AD.
- Exercise represents a potential non-pharmacological intervention for managing Alzheimer's disease.
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