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XB-ART-35636
J Biol Chem. May 25, 2007; 282 (21): 15903-11.

R-spondin1 is a high affinity ligand for LRP6 and induces LRP6 phosphorylation and beta-catenin signaling.

Wei Q , Yokota C , Semenov MV , Doble B , Woodgett J , He X .


Abstract
R-spondin proteins are newly identified secreted molecules that activate beta-catenin signaling. However, the mechanism of R-spondin action and its relationship with Wnt signaling remain unclear. Here we show that human R-spondin1 (hRspo1) is a high affinity ligand for the Wnt co-receptor LRP6 (K(d) = 1.2 nm). hRspo1 induces glycogen synthase kinase 3-dependent phosphorylation and activation of LRP6. DKK1, an LRP6 antagonist, inhibits hRspo1-induced LRP6 phosphorylation. We further demonstrate that hRspo1 synergizes with Frizzled5 in Xenopus axis induction assays and induces the phosphorylation of Dishevelled, a cytoplasmic component downstream of Frizzled function. Our study reveals interesting similarity and distinction between Wnt and R-spondin signaling.

PubMed ID: 17400545
Article link: J Biol Chem.

Genes referenced: dkk1 dvl2 fzd5 gys1 lrp6
Antibodies referenced:
Morpholinos referenced:

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