Researchers at Stanford Medicine have identified a single immune-cell receptor — called EP2 — that appears to be a key driver of the aging process across the entire body. The findings, published in Science, show that as organisms age, a hormone called PGE2 accumulates and overstimulates the EP2 receptor on tissue-resident macrophages. This suppresses the macrophages’ ability to clear out spent neutrophils — “zombie cells” that leak toxic substances and trigger chronic inflammation. When scientists genetically blocked the EP2 receptor in older mice (equivalent to humans in their 60s–70s), the results were striking: the animals stayed leaner, stronger, and cognitively sharper. Inflammation dropped in the heart, liver, kidneys, and brain. Memory and balance tests performed nearly as well as in young mice. Of 71 blood proteins that normally shift with age, 59 remained at youthful levels in the treated animals. “We’ve been trying to figure out why we age. Now we know at least one big reason for it,” said senior author Dr. Katrin Andreasson. A parallel analysis of human liver tissue confirmed similar molecular changes, suggesting the mechanism may translate to humans. The discovery opens the door to a new class of anti-aging therapies that target a single biological switch rather than treating individual diseases separately.
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