Moderate-Intensity Treadmill Exercise Regulates GSK3α/β Activity in the Cortex and Hippocampus of APP/PS1 Transgenic...

Area of Science:

• Neuroscience
• Exercise Physiology
• Molecular Biology

Background:

• Alzheimer's disease (AD) pathogenesis involves amyloid-beta (Aβ) accumulation and tau hyperphosphorylation.
• Physical exercise is recognized for its benefits in AD, but underlying molecular mechanisms require elucidation.

Purpose of the Study:

• To investigate the effects of moderate-intensity treadmill exercise on cognitive function and molecular markers in an Alzheimer's disease mouse model.
• To explore exercise-induced changes in amyloid precursor protein (APP)/Presenilin 1 (PS1) transgenic mice, focusing on Aβ levels, tau phosphorylation, and the Akt/GSK3 signaling pathway.

Main Methods:

• Six-month-old APP/PS1 transgenic and wild-type mice were subjected to a 12-week moderate-intensity treadmill running program or a sedentary condition.
• Cognitive function was assessed, followed by biochemical analysis of amyloid-beta (Aβ) levels and tau, Akt, and GSK3 phosphorylation in cortical and hippocampal tissues.

Main Results:

• Exercise significantly improved memory function in APP/PS1 mice compared to sedentary controls.
• Exercise led to reduced Aβ levels and altered tau, GSK3, and Akt phosphorylation patterns in the brains of transgenic mice.
• Specific changes in GSK3α/β and Akt phosphorylation were observed in both cortex and hippocampus, suggesting targeted molecular effects.

Conclusions:

• Moderate-intensity aerobic exercise is effective in enhancing memory in a mouse model of Alzheimer's disease.
• Exercise likely improves cognitive function through differential modulation of GSK3α/β phosphorylation in key brain regions.
• Findings support exercise as a potential non-pharmacological intervention for Alzheimer's disease.