1. Src and Fyn define a new signaling cascade activated by canonical and non-canonical Wnt ligands and required for gene transcription and cell invasion
- Author
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Beatriz Del Valle-Pérez, Antonio García de Herreros, Guillem Fuertes, Aida Villarroel, Josué Curto, Mireia Duñach, and Neus Ontiveros
- Subjects
STAT3 Transcription Factor ,Transcription, Genetic ,Proto-Oncogene Proteins c-fyn ,Receptor Tyrosine Kinase-like Orphan Receptors ,environment and public health ,Wnt-5a Protein ,Cell Line ,03 medical and health sciences ,Cellular and Molecular Neuroscience ,chemistry.chemical_compound ,FYN ,Neoplasms ,Wnt3A Protein ,Humans ,Neoplasm Invasiveness ,Phosphorylation ,Wnt Signaling Pathway ,Molecular Biology ,beta Catenin ,Pharmacology ,0303 health sciences ,Chemistry ,030302 biochemistry & molecular biology ,Wnt signaling pathway ,ROR2 ,LRP5 ,Tyrosine phosphorylation ,Cell Biology ,Frizzled Receptors ,Cell biology ,Enzyme Activation ,body regions ,enzymes and coenzymes (carbohydrates) ,HEK293 Cells ,Low Density Lipoprotein Receptor-Related Protein-5 ,src-Family Kinases ,Low Density Lipoprotein Receptor-Related Protein-6 ,embryonic structures ,Molecular Medicine ,Signal transduction ,Proto-oncogene tyrosine-protein kinase Src - Abstract
Wnt ligands signal through canonical or non-canonical signaling pathways. Although both routes share common elements, such as the Fz2 receptor, they differ in the co-receptor and in many of the final responses; for instance, whereas canonical Wnts increase β-catenin stability, non-canonical ligands downregulate it. However, both types of ligands stimulate tumor cell invasion. We show here that both the canonical Wnt3a and the non-canonical Wnt5a stimulate Fz2 tyrosine phosphorylation, Fyn binding to Fz2, Fyn activation and Fyn-dependent Stat3 phosphorylation. Wnt3a and Wnt5a require Src for Fz2 tyrosine phosphorylation; Src binds to canonical and non-canonical co-receptors (LRP5/6 and Ror2, respectively) and is activated by Wnt3a and Wnt5a. This Fz2/Fyn/Stat3 branch is incompatible with the classical Fz2/Dvl2 pathway as shown by experiments of over-expression or depletion. Fyn is necessary for transcription of genes associated with invasiveness, such as Snail1, and for activation of cell invasion by both Wnt ligands. Our results extend the knowledge about canonical Wnt pathways, demonstrating additional roles for Fyn in this pathway and describing how this protein kinase is activated by both canonical and non-canonical Wnts.
- Published
- 2019
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