Voluntary wheel running decreases amyloidogenic pathway and rescues cognition and mitochondrial energy metabolism in middle-aged female 3xTg-AD mouse model of Alzheimer's disease.
Level 5 - mechanism / opinion, no new human data
Preclinical animal model
PubMed 39573868 · doi:10.1177/13872877241289388
What was done
Female 3xTg-AD mice at 8 months of age underwent 6 months of voluntary wheel running. The authors assessed body metabolism, muscle oxidative profile, and cognitive performance via novel object recognition and open field tasks. They evaluated hippocampal levels of amyloidogenic AβPPβ fragment, phospho-Tau, phospho-Akt, and phospho-AMPK, as well as hippocampal mitochondrial respiratory function.
What was found
The abstract reports directional findings without numerical values or confidence intervals. Voluntary wheel running restored novel object recognition and open field retention memory in 3xTg-AD mice. In the hippocampus, running decreased levels of amyloidogenic AβPPβ fragment, phospho-Tau protein, and phospho-Akt, with no change in phospho-AMPK. Running also restored hippocampal mitochondrial respiratory function, addressing deficits in coupling degree and complex I contribution.
Why it matters
This study demonstrates that long-term voluntary exercise can reduce key biochemical markers of Alzheimer's pathology while rescuing hippocampal mitochondrial respiration and memory in a transgenic mouse model.
Limits
This is an animal study, limiting direct generalizability to humans. The abstract does not disclose sample sizes (n), numerical values, or effect sizes. Only female mice were evaluated, precluding assessment of sex-specific differences.
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