FGF-18

FGF-18 is a cartilage- and bone-centric ligand that signals through FGFR3 as well as FGFR1 and FGFR2. It drives proliferation of growth-plate chondrocytes, osteoblast differentiation and skull and limb skeletal development; Fgf18-null mice display delayed ossification and cleft palate. In adults FGF-18 is expressed in cartilage, lung and liver, and it stimulates proteoglycan synthesis in articular chondrocytes. A recombinant human FGF-18 variant, sprifermin, has been evaluated in clinical trials for knee osteoarthritis, where intra-articular injection increased cartilage thickness. Recombinant FGF-18 is used in chondrogenesis assays, skeletal biology research and FGFR3 ligand studies.