Rats with naturally high aerobic capacity exhibit distinct DNA methylation patterns in the hippocampus and elevated signaling through MAPK, AKT-mTOR, and synaptic pathways in cortical tissue—a molecular signature present independent of exercise training. This suggests intrinsic aerobic capacity creates a measurable biochemical state in aged brain tissue that may support cognitive resilience.
Key Points
- High-capacity runners show hypermethylation in hippocampal open-sea and gene-body regions
- Cortical signaling shifts toward MAPK, AKT-mTOR-S6, and synaptic pathway activation
- Molecular phenotype correlates with VO2 max independent of training intervention
Longevity Analysis
Intrinsic aerobic capacity—the genetic predisposition to perform work—encodes a distinct epigenetic state in brain tissue. Rather than requiring exercise training to achieve protective signaling patterns, individuals with high baseline capacity appear to maintain favorable methylation profiles and protein phosphorylation signatures in aged neural tissue. This decouples the neurobiological benefits of cardiovascular capacity from training behavior itself, suggesting that both genetic architecture and trainable aerobic function contribute to age-related brain preservation through different mechanistic pathways. The sustained elevation in MAPK and mTOR signaling, combined with specific methylation patterns, indicates how capacity-linked physiology maintains synaptic integrity and mitochondrial function when other regenerative markers remain unchanged.
Original published by Wiley Aging Cell, by Lei Zhou, Soroosh Mozaffaritabar, Erika Koltai, Takuji Kawamura, Mitsuru Higuchi, Sylwester Kujach, Yaodong Gu, Lauren Gerard Koch, Steven Loyal Britton, Zsolt Radák .