Physical activity-associated gene expression signature in nonhuman primate motor cortex

Area of Science:

• Neuroscience
• Genetics
• Metabolism

Background:

• Body weight regulation is significantly influenced by physical activity levels.
• The motor cortex's role in physical activity and its potential link to weight changes are not fully understood.

Purpose of the Study:

• To investigate if the motor cortex has a unique gene expression profile associated with physical activity.
• To identify specific genes in the motor cortex that correlate with physical activity levels and may influence body weight.

Main Methods:

• Gene expression profiling using DNA microarrays in the motor cortex of 14 female rhesus monkeys with varying physical activity levels.
• Quantitative polymerase chain reaction (qPCR) to validate specific gene expression changes.
• Analysis of protein levels for key genes and their downstream effectors.

Main Results:

• Physical activity strongly correlated with transcripts related to neuronal growth factor signaling and nutrient sensing in the motor cortex.
• Increased physical activity was associated with elevated levels of AKT3 protein, including total AKT and phosphorylated AKT.
• Downstream effectors like forkhead box O3 (FOXO3) and validated genes (CRBN, ORC4L, PDK4) showed significant changes.
• Specific genes identified are linked to physical activity-associated pathways in the motor cortex.

Conclusions:

• The motor cortex exhibits a distinct gene expression profile tied to physical activity.
• Identified genes, including AKT3, FOXO3, CRBN, ORC4L, and PDK4, play a role in the physical activity-associated pathway.
• These genes may be crucial for mediating physical activity's effects on body weight and providing neuroprotection.