Regenerative MedicineHow Aging Stem Cells Drive Bone Loss and What Science Can Do About It
As we age, the stem cells responsible for building new bone undergo a dramatic decline in function. This review examines how bone marrow mesenchymal stem cells become senescent, losing their ability to produce bone-forming osteoblasts while releasing inflammatory signals that accelerate bone loss. The authors detail how epigenetic changes — including DNA methylation shifts, histone modifications, and altered RNA regulation — drive this dysfunction. They also explore how these damaged stem cells corrupt the surrounding bone environment, worsening conditions like osteoporosis and osteoarthritis. Promising therapeutic avenues discussed include senolytics to clear dysfunctional cells, metabolic modulators, and extracellular vesicle therapies. The review calls for multi-omics and single-cell approaches to deepen understanding and guide next-generation treatments for age-related skeletal decline.
