Wnt5a modulates glycogen synthase kinase 3 to induce phosphorylation of receptor tyrosine kinase Ror2.
The receptor tyrosine kinase Ror2 plays important roles in mediating non-canonical Wnt5a signaling by activating the Wnt-JNK pathway and inhibiting the beta-catenin-TCF pathway. It has been shown that Ror2 is phosphorylated and activated by casein kinase Iepsilon when both molecules are over-expressed in cultured cells. However, it remains unknown whether or not Ror2 is phosphorylated upon Wnt5a stimulation. Here we show that Ror2 is phosphorylated on serine/threonine residues upon stimulation of cultured cells, expressing Ror2 endogenously, with Wnt5a, but not Wnt3a. It was found that treatment of cells with glycogen synthase kinase-3 (GSK-3) inhibitors (LiCl and SB216763) or small interfering RNAs (siRNAs) for GSK-3 (mainly GSK-3alpha) can inhibit Wnt5a-induced phosphorylation of Ror2. Immunoprecipitated Ror2 can also be phosphorylated by purified GSK-3alpha or GSK-3betain vitro, and ectopic co-expression of Ror2 and GSK-3 (mainly GSK-3alpha) in cultured cells results in Ror2 phosphorylation, irrespective of Wnt5a, that is sensitive to SB216763. These results indicate that GSK-3 is involved in Wnt5a-induced phosphorylation of Ror2. Moreover, it was found that Wnt5a-induced cell migration can be inhibited by SB216763 or by siRNA-mediated suppression of GSK-3alpha (and GSK-3beta) expression, further emphasizing the role(s) of GSK-3 in Wnt5a-induced signaling.
Yamamoto
Hiroyuki
H
Department of Physiology and Cell Biology, Faculty of Medical Sciences, Graduate School of Medicine, Kobe University, 7-5-1, Kusunoki-cho, Chuo-ku, Kobe 650-0017, Japan.
Yoo
Sa Kan
SK
Nishita
Michiru
M
Kikuchi
Akira
A
Minami
Yasuhiro
Y
D000818:Animals; D002478:Cells, Cultured; D038362:Glycogen Synthase Kinase 3 / Q000037:antagonists & inhibitors / Q000378:metabolism*; D006367:HeLa Cells; D006801:Humans; D007739:L Cells; D051379:Mice; D041681:NIH 3T3 Cells; D010766:Phosphorylation; D020794:Receptor Protein-Tyrosine Kinases / Q000378:metabolism*; D057050:Receptor Tyrosine Kinase-like Orphan Receptors; D011956:Receptors, Cell Surface / Q000378:metabolism*; D015398:Signal Transduction; D014162:Transfection; D051153:Wnt Proteins / Q000378:metabolism*; D000071818:Wnt-5a Protein
D011956:Receptors, Cell Surface; D051153:Wnt Proteins; D000071818:Wnt-5a Protein; C438615:Wnt5a protein, mouse; C078717:ROR2 protein, human; D020794:Receptor Protein-Tyrosine Kinases; D057050:Receptor Tyrosine Kinase-like Orphan Receptors; C477010:Ror2 protein, mouse; D038362:Glycogen Synthase Kinase 3