Blocking Sema4D may be a new osteoporosis target
Bone is a tissue in constant state of remodeling by osteoclasts (cells responsible for bone resorption) and osteoblasts (cells responsible for new bone formation).
Osteoporosis is a disease of progressive bone loss that is associated with increase risk of fractures. Particularly debilitating are hip fractures in the elderly that are costly to treat and also lead to increased death and reduction in quality of life. It’s estimated that osteoporosis affects 44 million people in the United States over the age of 50.
Most treatments for osteoporosis inhibit bone resorption e.g. bisphosphonates (alendronate, risedronate, ibandronate, zoledronic acid). By inhibiting or reducing bone resorption, there is a lower amount of bone loss.

Moderated by John Mendlein, the panel contained some R&D heavy weights:
For those unable to make it to Washington DC for the 2011 Convention of the Biotechnology Industry Organization (BIO) that starts today, you can follow all the 