Regenerative MedicineHow Nutrient-Sensing Pathways Control Stem Cell Aging and Tissue Renewal
Adult stem cells keep our tissues healthy by self-renewing and differentiating into specialized cells. This process depends heavily on how cells sense nutrients. A new review from Chinese Academy of Sciences researchers maps four key nutrient-sensing pathways — mTOR, AMPK, Sirtuins, and insulin/IGF-1 signaling — and shows how they work together to control whether stem cells stay dormant, become active, or differentiate. As we age, these pathways fall out of balance, causing stem cells to become exhausted and tissues to degenerate. The good news: interventions like rapamycin (an mTOR inhibitor), metformin (an AMPK activator), NAD+ precursors such as NMN or NR, and dietary strategies like caloric restriction may restore this balance and rejuvenate stem cell function, offering real therapeutic promise against aging and related diseases.
