Article ; Online: Rspo2 inhibits TCF3 phosphorylation to antagonize Wnt signaling during vertebrate anteroposterior axis specification.
2021 Volume 11, Issue 1, Page(s) 13433
Abstract: The Wnt pathway activates target genes by controlling the β-catenin-T-cell factor (TCF) transcriptional complex during embryonic development and cancer. This pathway can be potentiated by R-spondins, a family of proteins that bind RNF43/ZNRF3 E3 ... ...
Abstract | The Wnt pathway activates target genes by controlling the β-catenin-T-cell factor (TCF) transcriptional complex during embryonic development and cancer. This pathway can be potentiated by R-spondins, a family of proteins that bind RNF43/ZNRF3 E3 ubiquitin ligases and LGR4/5 receptors to prevent Frizzled degradation. Here we demonstrate that, during Xenopus anteroposterior axis specification, Rspo2 functions as a Wnt antagonist, both morphologically and at the level of gene targets and pathway mediators. Unexpectedly, the binding to RNF43/ZNRF3 and LGR4/5 was not required for the Wnt inhibitory activity. Moreover, Rspo2 did not influence Dishevelled phosphorylation in response to Wnt ligands, suggesting that Frizzled activity is not affected. Further analysis indicated that the Wnt antagonism is due to the inhibitory effect of Rspo2 on TCF3/TCF7L1 phosphorylation that normally leads to target gene activation. Consistent with this mechanism, Rspo2 anteriorizing activity has been rescued in TCF3-depleted embryos. These observations suggest that Rspo2 is a context-specific regulator of TCF3 phosphorylation and Wnt signaling. |
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MeSH term(s) | Animals ; Body Patterning/drug effects ; Body Patterning/physiology ; Embryo, Nonmammalian/abnormalities ; Embryo, Nonmammalian/drug effects ; Embryo, Nonmammalian/metabolism ; Embryonic Development/drug effects ; Gene Expression Regulation, Developmental/drug effects ; Genes, Reporter ; Head/embryology ; Intercellular Signaling Peptides and Proteins/physiology ; Phosphorylation/drug effects ; Protein Processing, Post-Translational/drug effects ; Transcription Factor 3/antagonists & inhibitors ; Transcription Factor 3/metabolism ; Wnt Signaling Pathway/drug effects ; Xenopus Proteins/antagonists & inhibitors ; Xenopus Proteins/biosynthesis ; Xenopus Proteins/genetics ; Xenopus Proteins/metabolism ; Xenopus Proteins/pharmacology ; Xenopus Proteins/physiology ; Xenopus laevis/embryology |
Chemical Substances | Intercellular Signaling Peptides and Proteins ; Rspo2 protein, Xenopus ; Tcf3 protein, Xenopus ; Transcription Factor 3 ; Xenopus Proteins |
Language | English |
Publishing date | 2021-06-28 |
Publishing country | England |
Document type | Journal Article ; Research Support, N.I.H., Extramural |
ZDB-ID | 2615211-3 |
ISSN | 2045-2322 ; 2045-2322 |
ISSN (online) | 2045-2322 |
ISSN | 2045-2322 |
DOI | 10.1038/s41598-021-92824-6 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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