Diffusion tensor-MRI detects exercise-induced neuroplasticity in the hippocampal microstructure in mice

Area of Science:

• Neuroscience
• Exercise Physiology
• Biomedical Imaging

Background:

• Translating animal study findings on exercise-induced neuroplasticity to humans is challenging due to differing research techniques.
• Bridging the gap between preclinical and clinical research methods is crucial for understanding brain adaptation to exercise.

Purpose of the Study:

• To investigate exercise-induced brain plasticity in mice using diffusion tensor imaging MRI (DTI), a technique common in human studies.
• To establish a translational bridge between animal models and human research on exercise and neuroplasticity.

Main Methods:

• A longitudinal study involving voluntary free-wheel running exercise in wild-type mice.
• Diffusion tensor imaging MRI scans were performed at baseline, 4 weeks, and 9 weeks.
• Histological analysis was conducted to examine cellular changes.

Main Results:

• Significant increases in hippocampal volume and fractional anisotropy (a measure of white matter integrity) were observed with exercise.
• Exercise levels positively correlated with the observed effect size.
• Increased numbers of PDGFRα+ oligodendrocyte precursor cells were found in the corpus callosum of exercising mice.

Conclusions:

• The study provides in vivo evidence that exercise induces similar adaptive brain changes in mice and humans.
• DTI MRI is a viable technique for studying exercise-induced neuroplasticity in animal models, facilitating translational research.
• Exercise promotes neurogenesis and white matter plasticity, supporting its benefits for brain health across species.