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Long-term treadmill exercise induces neuroprotective molecular changes in rat brain
S Bayod1, J Del Valle, A M Canudas
1Unitat de Farmacologia i Farmacognòsia Facultat de Farmàcia, Universitat de Barcelona, Nucli Universitari de Pedralbes, E-08028 Barcelona, Spain.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|August 6, 2011
Summary
Long-term moderate exercise in rats improved brain health, particularly in the hippocampus. This enhanced neuroprotection by upregulating beneficial pathways and preventing neurodegeneration signs.
Area of Science:
- Neuroscience
- Exercise Physiology
- Molecular Biology
Background:
- Exercise benefits general health, but its impact on neurodegeneration and underlying brain mechanisms remain unclear.
- Understanding molecular pathways is crucial for harnessing exercise's neuroprotective potential.
Purpose of the Study:
- To investigate the cellular mechanisms of long-term moderate treadmill training on the adult male rat brain.
- To identify exercise-induced changes in key molecular pathways and their effect on neurodegeneration markers.
Main Methods:
- Comparison of three groups: exercised, handled non-exercised, and sedentary rats over 36 weeks.
- Analysis of Insulin-like Growth Factor 1 (IGF-1), PGC-1α, OXPHOS system, and sirtuin 1 pathway activation.
- Assessment of tau hyperphosphorylation and GSK3β activation to evaluate neuroprotective effects.
Main Results:
- Moderate exercise increased IGF-1, PGC-1α, and OXPHOS system activity.
- Sirtuin 1 pathway was activated by exercise and handling, but not in sedentary rats.
- Exercise significantly reduced phospho-tau and GSK3β activation, especially in the hippocampus.
Conclusions:
- Long-term moderate exercise positively impacts brain parameters, particularly in the hippocampus, in a rodent model.
- Exercise upregulates sirtuin 1, stimulates mitochondrial biogenesis, activates AMPK, and prevents neurodegeneration.
- Findings support exercise's role in hormesis and neuroprotection, aligning with existing research.
