Exercise Fights Osteoporosis Study
A new study published in ScienceAlert has uncovered the key mechanism explaining how exercise, particularly strength training, combats osteoporosis. The research shows that mechanical load from resistance exercise directly stimulates bone-forming cells, reinforcing the importance of weight-bearing activities for lifelong skeletal strength. The findings could lead to improved treatments for the disease that weakens bones and affects millions worldwide.
- The newly identified mechanism centers on a protein called Piezo1, which acts as an "exercise sensor" in bone marrow mesenchymal stem cells (BMMSCs). When activated by mechanical force, Piezo1 guides these stem cells to become bone-forming osteoblasts instead of fat cells called adipocytes. - This research was led by a team of biomedical scientists, including Xu Aimin, from the University of Hong Kong. Their experiments on mice demonstrated that removing the Piezo1 protein led to lower bone density and prevented the bone-strengthening benefits of exercise. - Osteoporosis is a significant global health issue, affecting an estimated 200 million women worldwide. Globally, one in three women and one in five men over the age of 50 will experience a fracture due to osteoporosis. - The discovery of Piezo1's role could lead to new drugs that activate this pathway, essentially mimicking the bone-building effects of exercise for those unable to perform physical activity, such as the frail and elderly. - Current treatments for osteoporosis primarily fall into two categories: anti-resorptive agents like bisphosphonates which slow bone destruction, and anabolic agents like teriparatide which stimulate bone formation. - While promising, the findings are based on mouse models, and manipulating the Piezo1 protein in humans could be complex as it performs many different roles throughout the body.
