Scientists Reverse Muscle Aging by Reactivating Cellular Energy Pathway

Age-related muscle loss affects millions of people, but scientists have discovered a promising way to rejuvenate aging muscle stem cells by targeting cellular energy production pathways.

Researchers studied satellite cells, the stem cells responsible for muscle repair and growth, in 18-month-old mice (equivalent to elderly humans). They found that these cells had significantly reduced HIF-1α signaling, a pathway crucial for cellular energy metabolism under low-oxygen conditions.

The team treated aged muscle cells with roxadustat, an FDA-approved drug that reactivates HIF-1α signaling. This treatment restored the cells' ability to produce lactate, a metabolic byproduct that serves important signaling functions. The increased lactate triggered beneficial epigenetic changes through histone lactylation, essentially reprogramming the cells' gene expression patterns.

Treated cells showed remarkable improvements: they reduced senescence markers by 54%, increased stem cell maintenance factors, and when prompted to form muscle fibers, created significantly larger and more metabolically active muscle tissue. The cells also activated growth pathways associated with muscle building and repair.

This research provides a mechanistic explanation for how cellular energy metabolism influences muscle aging and suggests that drugs targeting HIF-1α could help maintain muscle mass and function during aging. Since roxadustat is already approved for treating anemia, it could potentially be repurposed for sarcopenia treatment, though human trials would be necessary to confirm safety and efficacy for this application.