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Scientists find a way to help the body evict its own zombie cells. Researchers at Albert Einstein College of Medicine discovered that a declining cellular recycling process called chaperone-mediated autophagy (CMA) lets senescent "zombie" cells accumulate with age. Restoring CMA in mice reduced zombie-cell buildup and eased lung fibrosis — and a small-molecule drug called CA77.1 looks promising as a potential treatment.
Scientists find a way to help the body evict its own zombie cells
As we age, our bodies fill up with "zombie cells" — cells that have stopped functioning normally but refuse to die, quietly fueling chronic inflammation and age-related disease. A new study published in Nature Aging by researchers at Albert Einstein College of Medicine reveals why these senescent cells become so hard to clear: a cellular recycling process called chaperone-mediated autophagy (CMA) declines with age, impairing both the zombie cells themselves and the immune cells (macrophages) tasked with removing them.
In older mice, this CMA decline caused senescent cells to secrete toxic substances that turned nearby healthy cells into zombies and blocked macrophages from recognizing and engulfing them. Restoring CMA — using a small-molecule drug called CA77.1 — reduced zombie-cell accumulation across multiple organs and lessened lung fibrosis severity in mouse models. Human lung tissue from idiopathic pulmonary fibrosis (IPF) patients also showed markedly reduced CMA activity, suggesting the findings may translate to people.
By the numbers
Why it matters: Rather than killing zombie cells with drugs (senolytics), this approach aims to restore the body's natural immune clearance — a potentially safer and more targeted strategy for tackling aging-related diseases like lung fibrosis and beyond.
