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1 Okazaki Institute for Integrative Bioscience, National Institutes of Natural Sciences, Myodaiji, Okazaki, Aichi 444-8787, Japan
2 Kondoh Differentiation Signaling Project, ERATO/Kondoh Research Team, SORST, JST, Yoshidakawaracho, Sakyo-ku, Kyoto 606-8305, Japan
3 Graduate School of Frontier Biosciences, Osaka University, Yamadaoka, Suita 565-0871, Japan
4 Department of Molecular Biomechanics, The Graduate University for Advanced Studies (SOKENDAI), Myodaiji, Okazaki, Aichi 444-8787, Japan
Both Wnt ligands and Frizzled (Fz) receptors each constitute a large family in vertebrates, but the receptor specificity of each Wnt has remained largely unknown. Here, we examined the receptor specificity of two typical Wnts, Wnt-3a and Wnt-5a, in signal transmission. To investigate systematically the combinatorial effects of these Wnts, various Fzs on canonical Wnt/ß-catenin signaling, we analyzed the ability of these Wnt proteins to increase stability of armadillo/ß-catenin proteins in Drosophila S2 cells expressing vertebrate Fzs. Wnt-3a increases the amount of armadillo proteins in cells expressing Fzs 4, 5 and 8, but not Fzs 3 and 6; whereas Wnt-5a does not increase it in any cell line. In contrast, both Wnt-3a and Wnt-5a increase the phosphorylation of Dsh in combination with most of the Fzs. This Dsh phosphorylation is abrogated by decreasing the levels of casein kinase I 
by double-stranded RNA-mediated translational interference. These observations indicate that both Wnt proteins can interact with the majority of Fz receptors and elicit signaling reactions exemplified by Dsh phosphorylation but that the stabilization of ß-catenin/armadillo proteins in the Wnt/ß-catenin signaling occurs only when specific combinations of Wnt and Fz meet.
* Correspondence: E-mail: stakada{at}nibb.ac.jp
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