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

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NDRG1 keeps aging muscle stem cells alive, but makes them slower to activate and repair damaged muscle.
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Blocking NDRG1 in mice equivalent to 75 human years restored youthful stem-cell activity and improved muscle repair.
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Removing NDRG1 speeds short-term muscle regeneration, then leaves fewer stem cells for future injuries.
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Boosting aged stem cells may improve repair briefly, but the same treatment can reduce survival and backfire.
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Slower muscle repair in aging may be protection, not failure, preserving the stem cells needed later.
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Aging may filter muscle stem cells, leaving NDRG1-rich survivors that endure longer but repair more slowly.
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Older mice have 3.5 times more NDRG1 in their muscle stem cells than young mice.
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As muscle stem cells age, they may trade reproduction for resilience, like animals choosing hibernation over reproduction during deprivation.
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Researchers still need to identify how aging stem cells choose between staying alive and performing fast repairs.

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