Short peptide slows egg cell aging in mice
Female fertility begins to decline in the mid-thirties, and no effective treatment currently exists to slow this process. Researchers now report that a small molecule can delay multiple signs of reproductive aging in mice.
Scientists published their findings in the journal Aging Cell. They studied elamipretide, a peptide (a short chain of amino acids) known to accumulate in the inner membrane of mitochondria, the energy-producing structures inside cells. There, it supports energy production and reduces oxidative damage, the harm caused by reactive oxygen molecules. Both processes are also involved in the aging of egg cells (oocytes), which led the researchers to test the compound in aged mice.
What happened in aged mice
A seven-day treatment regimen was found to be optimal. Aged mice that received elamipretide showed improved fertilization rates and larger litter sizes in the month following treatment. Metabolite analysis revealed that 250 small molecules were present at different levels in aged mouse ovaries compared with young ones. Treatment partially reversed those changes. Among the affected compounds was pyruvate, a molecule linked to mitochondrial energy metabolism, which was altered in aged ovaries and influenced by elamipretide.
The treatment also affected vitamin B6 metabolism. Supplementing vitamin B6 separately improved oocyte quality in aged mice. In addition, elamipretide altered activity in the VEGF-A signaling pathway, which is involved in oocyte maturation. Inhibiting VEGF-A improved oocyte quality, suggesting elamipretide acts through this pathway.
Also tested in human oocytes in the lab
Alongside the mouse experiments, the researchers tested elamipretide on human oocytes in vitro. The source describes these results as promising, but detailed findings from the human oocyte component are limited in the available reporting. No approved treatment currently slows ovarian aging. This research points to a direction for future investigation, but clinical applications remain distant.
Search terms to explore further: mitochondrial function oocyte quality, oxidative stress ovarian aging, VEGF signaling oocyte maturation