Scientists finally know how exercise strengthens bones
Osteoporosis is a disease that weakens bones and affects tens of millions of people, and long-awaited new therapies could be on the horizon after researchers discovered a key mechanism by which exercise strengthens bones.
TL;DR
- Researchers discovered a key mechanism by which exercise strengthens bones.
- The protein Piezo1 acts as an 'exercise sensor' in bones, promoting bone growth and reducing fat accumulation.
- This mechanism involves directing mesenchymal stem cells towards becoming bone-building osteoblasts instead of fat cells (adipocytes).
- Previous studies indicated mechanical forces shift the balance towards bone growth, but the 'why' was unclear until now.
- Mice lacking Piezo1 showed reduced bone density, decreased bone formation, and increased adipocytes in bone marrow, and did not benefit from exercise in bone strengthening.
- The identified signaling pathways are reversible, offering potential for future drug development to mimic Piezo1's effects.
- New therapies could benefit individuals unable to exercise due to age or physical limitations, reducing bone loss and fracture risk.
- Human therapies are still distant, as the study was on mice and Piezo1 has many functions in the body.
- This research provides a promising strategy beyond traditional physical therapy to preserve bone health in aging populations.