Caffeine Activates Ancient AMPK Aging Switch — SkimNews
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- Queen Mary University of London researchers found caffeine activates AMPK, an ancient cellular energy sensor involved in stress resistance, DNA repair, and growth — processes closely tied to aging.
- The study, published in the journal Microbial Cell, was conducted in fission yeast, a single-celled organism that shares key biological features with human cells and is sometimes called a "mini-human."
- A surprising twist: caffeine appears to work through AMPK rather than acting directly on TOR, a growth-regulating pathway the same Queen Mary research group had previously linked to caffeine's lifespan effects.
- AMPK functions as a cellular "fuel gauge," detecting when energy is low and helping cells cope — and because it is conserved across yeast and humans, it is a major target for metabolism and aging research.
- AMPK is also the pathway targeted by metformin, a widely used diabetes drug being investigated for longevity effects, making caffeine's connection to the same system especially intriguing.
- Dr. Charalampos Rallis, the study's senior author, said the results show caffeine helps "flip" the AMPK switch when cells are running low on energy.
- The authors caution the findings do not prove coffee extends human life — fission yeast results don't always translate directly, though the shared AMPK pathway gives researchers a biological clue worth following.
Why it matters: The finding repositions caffeine from a known stimulant to a candidate modulator of an evolutionarily ancient metabolic pathway (TOR/AMPK systems date back more than 500 million years) that longevity researchers already target with drugs like metformin and rapamycin. For drug developers, it adds a dietary compound to the AMPK conversation; for consumers, it offers a mechanistic clue — not a prescription — for why moderate caffeine intake keeps showing up in healthy-aging studies.
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