Caffeine May Flip an Ancient Cellular Switch Tied to Aging

Your morning coffee may be doing more than helping you wake up. Research from Queen Mary University of London suggests that caffeine can activate an ancient cellular energy system involved in growth, stress resistance and DNA repair, all processes closely tied to aging. The findings, from the university's Cellular Ageing and Senescence laboratory, were published in the journal Microbial Cell.

The researchers studied fission yeast, a single-celled organism that shares many important biological features with human cells and is sometimes called a "mini-human." A few years ago, the same group showed that caffeine could help cells live longer by influencing TOR (Target of Rapamycin), a growth regulator that has been controlling growth, energy use and stress responses in living organisms for more than 500 million years.

The latest study found a surprising twist: instead of acting directly on TOR, caffeine appears to work through a different system called AMPK (AMP-activated protein kinase), a cellular energy sensor that helps maintain metabolic balance. "When your cells are low on energy, AMPK kicks in to help them cope," said Dr. Charalampos (Babis) Rallis of Queen Mary University of London, the study's senior author. "And our results show that caffeine helps flip that switch."

AMPK is found in both yeast and humans, and is also linked to metformin, a diabetes drug studied for its possible effects on aging, and rapamycin, a growth-signaling compound also being investigated for lifespan effects. The researchers found that caffeine's effects on this pathway can influence cell growth, stress responses and DNA repair, a process considered especially important because unrepaired genetic damage can build up over time.

"These findings help explain why caffeine might be beneficial for health and longevity, and they open up exciting possibilities for future research into how we might trigger these effects more directly, with diet, lifestyle, or new medicines," said Dr. John-Patrick Alao, the postdoctoral researcher who led the study. The study does not prove that drinking coffee will make people live longer, since the experiments were carried out in fission yeast and results from simple organisms do not always translate directly to humans.