Old muscle stem cells can act young again but there’s a catch

A team at UCLA has uncovered the reason aging muscles heal more slowly than they used to. In older muscle stem cells, a protein called NDRG1 builds up and essentially hits the brakes on repair—slowing how quickly these cells can spring into action after an injury. But here's the twist: that same protein is actually keeping these aging cells alive, protecting them from the stresses of getting older. Researchers say it's a biological trade-off: cells gain resilience against aging but lose speed in healing. The discovery could eventually help scientists find ways to restore faster healing without compromising cell survival.

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