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XB-ART-36442
Dev Biol October 15, 2007; 310 (2): 250-63.
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Wise retained in the endoplasmic reticulum inhibits Wnt signaling by reducing cell surface LRP6.

Guidato S , Itasaki N .


Abstract
The Wnt signaling pathway is tightly regulated by extracellular and intracellular modulators. Wise was isolated as a secreted protein capable of interacting with the Wnt co-receptor LRP6. Studies in Xenopus embryos revealed that Wise either enhances or inhibits the Wnt pathway depending on the cellular context. Here we show that the cellular localization of Wise has distinct effects on the Wnt pathway readout. While secreted Wise either synergizes or inhibits the Wnt signals depending on the partner ligand, ER-retained Wise consistently blocks the Wnt pathway. ER-retained Wise reduces LRP6 on the cell surface, making cells less susceptible to the Wnt signal. This study provides a cellular mechanism for the action of Wise and introduces the modulation of cellular susceptibility to Wnt signals as a novel mechanism of the regulation of the Wnt pathway.

PubMed ID: 17765217
Article link: Dev Biol
Grant support: [+]

Species referenced: Xenopus laevis
Genes referenced: ctnnb1 dkk3 egr2 emx2 en2 fzd2 lrp6 muc2 muc2l myc ncam1 nodal3.1 nog sia1 sostdc1 tub wnt3a
Morpholinos: sostdc1 MO1 sostdc1 MO2


Article Images: [+] show captions