[Roles of Wnt signaling in bone metabolism].

Wnts, palmitoylated and glycosylated molecules play a central role in the early development of organs and tissues. Wnts bind to receptor complexes of frizzled and low density lipoprotein-related protein 5/6, which in turn, activate theβ-catenin-dependent canonical pathway. Wnt5a, a typical non-canonical ligand, activates theβ-catenin-independent noncanonical pathways such as the Wnt/Ca pathway and the Wnt/planar cell polarity pathway. Recent studies have established that Wnt-mediated signals are crucial for bone formation and resorption. This review summarizes the current knowledge of the roles of Wnt signaling in bone formation and resorption.