Isolation, culture, and osteogenic/chondrogenic differentiation of bone marrow-derived mesenchymal stem cells.

Musculoskeletal disorders, as non-healing fractures and large bone defects, articular cartilage and subchondral bone injuries, often result in lifelong chronic pain and compromised quality of life. Although generally a natural process, failure of large bone defects to heal such as after complex fractures, resection of tumours, infections, or revisions of joint replacements remains a critical challenge that requires more appropriate solutions as those currently available. In addition, regeneration of chondral and osteochondral defects continues to be a challenge until to date. A profound understanding of the underlying mechanisms of endogenous regeneration is a prerequisite for successful bone and cartilage regeneration. Presently, one of the most promising therapeutic approaches is cell-based tissue engineering which provides a healthy population of cells to the injured site. Use of differentiated cells has severe limitations; an excellent alternative would be the application of adult marrow stromal cells/mesenchymal stem cells (MSC) which possess extensive proliferation potential and proven capability to differentiate along the osteochondral pathway. The process of osteo-/chondrogenesis can be mimicked in vitro by inducing osteo-chondroprogenitor stem cells to undergo osteogenesis and chondrogenesis through exposure of osteo-/chondrogenic favourable microenvironmental, mechanical, and nutritional conditions. This chapter provides comprehensive protocols for the isolation, expansion, and osteo-/chondrogenic differentiation of adult bone marrow-derived MSC.