Osteopontin induces cyclo-oxygenase-2 expression in osteoclasts.
Osteopontin (OPN) is a secreted phosphoprotein that is abundant in the bone matrix and plays an important role in bone homeostasis. Cortical bone in OPNnull mice has a heterogenous mineral density and reduced fracture toughness indicative of a defect in bone homeostasis. Osteoclasts binding to bone appears to be mediat...