MCell: Caffeine Activates a Cellular Mechanism Linked to Aging

Scientists have discovered that caffeine activates an ancient cellular mechanism known as AMPK, which is involved in stress resistance, DNA repair and growth regulation — processes closely linked to aging. The study was published in the journal Microbial Cell.

AMPK acts as a kind of cellular energy sensor: it is activated when energy levels are low and switches the cell from growth mode to a state focused on conserving energy and “repair.” This system is extremely ancient — it has regulated metabolism in living organisms for more than 500 million years and functions in similar ways in yeast, animals and humans.

Researchers led by John-Patrick Alao from the Cellular Senescence Laboratory at Queen Mary University of London studied dividing yeast cells — single-celled organisms that, despite their simplicity, share many important biological mechanisms with humans. They found that caffeine activates AMPK in these cells, shifting them toward a state associated with slower aging.

Previously, the effects of caffeine were more often linked to another growth regulator, the TOR protein. The new study, however, suggests that caffeine affects aging indirectly through AMPK. This may help explain why coffee has been associated with a wide range of effects on metabolism and lifespan.

The AMPK mechanism is of particular interest to scientists because it is also activated by other interventions associated with longevity, such as metformin and physical exercise. If caffeine is confirmed to affect the same system, this could help explain why observational studies have often found a lower risk of certain age-related diseases among coffee drinkers.