Fixing calcium signals extends mouse lifespan
Cells use tiny calcium pulses as switches for hundreds of processes. When those signals go wrong with age, the body deteriorates faster. Researchers now show that correcting this imbalance with an existing antidepressant can extend lifespan in mice.
Calcium ions (Ca²⁺) act as on/off signals inside cells. A rise or drop in cytoplasmic calcium concentration activates or silences dozens of pathways. It has long been known that calcium balance breaks down in age-related diseases, from heart failure to Alzheimer’s. What was missing was a clear molecular chain linking this breakdown to cellular aging itself.
A team of Chinese researchers, publishing in Nature Communications, set out to trace that chain. They studied both progeroid mice, which age rapidly due to a genetic mutation, and naturally aging mice. In both, calcium levels in the cytoplasm were elevated. The source turned out to be a leaky channel called IP3R on the endoplasmic reticulum (ER), the organelle responsible for protein production and storage.
From calcium leak to cellular aging
The excess calcium activated a protein called S100A6, which in turn bound to and destabilised PARP1, a key DNA-repair enzyme. With less functional PARP1, DNA damage accumulated. Small fragments of DNA escaped from the nucleus and triggered an inflammatory signalling pathway known as cGAS-STING, pushing cells into a state of chronic low-grade inflammation, a hallmark of aging sometimes called inflammaging.
The team then tested whether this chain could be reversed. The researchers found that mianserin, an approved antidepressant, inhibited IP3R. In progeroid mice, health markers improved visibly. In naturally aging mice, both median and maximum lifespan increased. These results are so far only demonstrated in mice, and whether the same mechanism operates with similar strength in humans remains unknown.
Why this matters for longevity research
The study is notable for mapping a specific molecular pathway from calcium imbalance to cellular senescence. It also points to an existing approved drug, potentially shortening the road to clinical investigation. The finding that DNA-repair capacity is regulated through calcium signalling is a genuinely new angle. That said, the gap between mouse and human biology is substantial, and the progeroid model represents an accelerated, atypical aging process. Whether mianserin has comparable effects in healthy aging humans is still an open question.
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