Biological Activity: The ED50, as determined by inhibition of Wnt-3a induced alkaline phosphatase production using mouse MC3T3E1 cells, is less than 150 ng/mL.
Relevance: Antagonizes canonical Wnt signaling by inhibiting LRP5/6 interaction with Wnt and by forming a ternary complex with the transmembrane protein KREMEN that promotes internalization of LRP5/6. DKKs play an important role in vertebrate development, where they locally inhibit Wnt regulated processes such as antero-posterior axial patterning, limb development, somitogenesis and eye formation. In the adult, Dkks are implicated in bone formation and bone disease, cancer and Alzheimer disease. {ECO:0000269|PubMed:22000856}. Synonyms: Dickkopf-1, hDkk-1, SK