LDL-receptor-related proteins in Wnt signal transduction

Keiko Tamai, Mikhall Semenov, Yolchi Kato, Rebecca Spokony, Chunming Liu, Yu Katsuyama, Fred Hess, Jean Pierre Saint-Jeannet, Xi He

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Abstract

The Wnt family of secreted signalling molecules are essential in embryo development and tumour formation. The Frizzled (Fz) family of serpentine receptors function as Wnt receptors, but how Fz proteins transduce signalling is not understood. In Drosophila, arrow phenocopies the wingless (DWnt-1) phenotype, and encodes a transmembrane protein that is homologous to two members of the mammalian, low-density lipoprotein receptor (LDLR)-related protein (LRP) family, LRP5 and LRP6 (refs 12-15). Here we report that LRP6 functions as a co-receptor for Wnt signal transduction. In Xenopus embryos, LRP6 activated Wnt-Fz signalling, and induced Wnt responsive genes, dorsal axis duplication and neural crest formation. An LRP6 mutant lacking the carboxyl intracellular domain blocked signalling by Wnt or Wnt-Fz, but not by Dishevelled or β-catenin, and inhibited neural crest development. The extracellular domain of LRP6 bound Wnt-1 and associated with Fz in a Wnt-dependent manner. Our results indicate that LRP6 may be a component of the Wnt receptor complex.

Original languageEnglish (US)
Pages (from-to)530-535
Number of pages6
JournalNature
Volume407
Issue number6803
DOIs
StatePublished - Sep 28 2000

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Cite this

Tamai, K., Semenov, M., Kato, Y., Spokony, R., Liu, C., Katsuyama, Y., Hess, F., Saint-Jeannet, J. P., & He, X. (2000). LDL-receptor-related proteins in Wnt signal transduction. Nature, 407(6803), 530-535. https://doi.org/10.1038/35035117