Secreted Frizzled-related Protein 2 (sFRP2) Redirects Non-canonical Wnt Signaling from Fz7 to Ror2 during Vertebrate Gastrulation.

Eva-Maria Brinkmann, Benjamin Mattes, Rahul Kumar, Anja I H Hagemann, Dietmar Gradl, Steffen Scholpp, Herbert Steinbeisser, Lilian T Kaufmann, Suat Özbek

The Journal of biological chemistry 2016 Jun 24

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Convergent extension movements during vertebrate gastrulation require a balanced activity of non-canonical Wnt signaling pathways, but the factors regulating this interplay on the molecular level are poorly characterized. Here we show that sFRP2, a member of the secreted frizzled-related protein (sFRP) family, is required for morphogenesis and papc expression during Xenopus gastrulation. We further provide evidence that sFRP2 redirects non-canonical Wnt signaling from Frizzled 7 (Fz7) to the receptor tyrosine kinase-like orphan receptor 2 (Ror2). During this process, sFRP2 promotes Ror2 signal transduction by stabilizing Wnt5a-Ror2 complexes at the membrane, whereas it inhibits Fz7 signaling, probably by blocking Fz7 receptor endocytosis. The cysteine-rich domain of sFRP2 is sufficient for Ror2 activation, and related sFRPs can substitute for this function. Notably, direct interaction of the two receptors via their cysteine-rich domains also promotes Ror2-mediated papc expression but inhibits Fz7 signaling. We propose that sFRPs can act as a molecular switch, channeling the signal input for different non-canonical Wnt pathways during vertebrate gastrulation. © 2016 by The American Society for Biochemistry and Molecular Biology, Inc.

Citation

Eva-Maria Brinkmann, Benjamin Mattes, Rahul Kumar, Anja I H Hagemann, Dietmar Gradl, Steffen Scholpp, Herbert Steinbeisser, Lilian T Kaufmann, Suat Özbek. Secreted Frizzled-related Protein 2 (sFRP2) Redirects Non-canonical Wnt Signaling from Fz7 to Ror2 during Vertebrate Gastrulation. The Journal of biological chemistry. 2016 Jun 24;291(26):13730-42