UCLA blocks NDRG1 to speed muscle repair in aged mice
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- NDRG1 levels rise about 3.5‑fold in old muscle stem cells compared with young cells.
- mTOR signaling is dampened by NDRG1, acting as a brake on stem‑cell activation.
- NDRG1 inhibition in mice equivalent to ~75 human years restored fast stem‑cell activation and sped muscle healing.
- Stem cells with blocked NDRG1 showed reduced long‑term survival, limiting regeneration after repeated injuries.
- Researchers describe the pattern as “cellular survivorship bias,” where stress‑resistant, slower‑acting cells dominate with age.
- UCLA led the work, with senior author Dr. Thomas Rando directing the Broad Center of Regenerative Medicine.
- The study appears in Science (2026; 391 (6784): 517) and was funded by NIH, NOMIS Foundation, Milky Way Research Foundation, Hevolution Foundation, and Korea’s National Research Foundation.
Why it matters: Older adults could see faster muscle recovery if NDRG1 inhibition translates to humans, but the approach may deplete the stem‑cell pool, limiting regeneration after repeated injuries. The finding redirects anti‑aging research toward balancing repair speed with cell longevity and may require new therapeutic strategies to preserve long‑term muscle health.
