Treadmill Exercise Facilitates Synaptic Plasticity in APP/PS1 Mice by Regulating Hippocampal AMPAR Activity

Area of Science:

• Neuroscience
• Exercise Physiology
• Alzheimer's Disease Research

Background:

• Exercise is a recognized lifestyle intervention for mitigating Alzheimer's disease (AD) risk and progression.
• The precise cellular and molecular mechanisms behind exercise's benefits in AD are not fully understood.
• Investigating these mechanisms is crucial for developing targeted therapeutic strategies.

Purpose of the Study:

• To investigate the effects of treadmill exercise on memory, synaptic plasticity, and AMPARs in an AD mouse model.
• To elucidate the molecular pathways linking exercise to improved cognitive function in the context of Alzheimer's disease.

Main Methods:

• Utilized 4-month-old male APP/PS1 mice, a model for Alzheimer's disease, and C57BL/6J controls.
• Assigned mice to either an 8-week treadmill exercise regimen or a sedentary condition.
• Assessed memory retrieval, hippocampal synaptic plasticity (STP, LTP), synaptic morphology, and AMPAR expression/activity.

Main Results:

• Treadmill exercise significantly reversed memory retrieval deficits in APP/PS1 mice.
• Exercise enhanced hippocampal synaptic strength, short-term potentiation (STP), and long-term potentiation (LTP).
• Exercise increased synapse numbers, improved synaptic structures, and elevated AMPAR expression and activity.

Conclusions:

• Treadmill exercise improves behavioral performance in an Alzheimer's disease mouse model.
• Exercise facilitates synaptic transmission via enhanced structural plasticity and AMPAR activity in the hippocampus.
• These findings highlight exercise as a viable intervention for enhancing cognitive function and synaptic health in AD.