Rapamycin significantly improves tendon-to-bone healing in ageing by enhancing bone growth, fibrocartilage regeneration, and tendon repair, leading to better structural and functional recovery after injury.
September 2024 – Journal of Shoulder and Elbow Surgery
Key takeaways
- Supports tissue regeneration with age: Rapamycin accelerated repair at the tendon-to-bone interface by enhancing the formation of fibrocartilage and promoting structural integrity. This suggests potential for reversing age-related declines in healing capacity and musculoskeletal resilience, key factors in maintaining mobility and function with age
- Improves bone strength and density: Older rats treated with rapamycin had significantly increased bone mineral density and trabecular volume at the repair site. This points to rapamycin’s ability to stimulate osteogenesis, which may counteract the natural bone thinning that occurs with ageing and support stronger joint and tendon attachments
- Stimulates key repair pathways: Rapamycin increased levels of regenerative markers, including RUNX2, SOX9, and SCX, which are vital for bone, cartilage, and tendon formation. By activating these pathways, rapamycin may help restore a more youthful regenerative profile in aged tissues, potentially extending musculoskeletal healthspan
- Enhances mechanical resilience post-injury: Treated animals showed greater failure load, strength, and stiffness in repaired tissue compared to untreated controls. These improvements suggest rapamycin enhances the quality and durability of tissue repair, which is essential for injury prevention and maintaining physical activity levels with advancing age
Read the article at:Zhi, Xinwang, et al. “Rapamycin facilitates healing of the tendon-bone interface in an aging rat model of chronic rotator cuff injury.” Journal of Shoulder and Elbow Surgery, vol. 33, 2024, pp. 2064–2072. https://doi.org/10.1016/j.jse.2024.01.056.
