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Published on: June 17, 2014
Wnt4 inhibits beta-catenin/TCF signalling by redirecting beta-catenin to the cell membrane
Pascal Bernard1, Alice Fleming, Arnaud Lacombe
1Human Molecular Genetics laboratory, Prince Henry's Institute of Medical Research, Monash Medical Centre, PO Box 5152, Clayton 3168, VIC, Australia.
Background Information:
During embryonic development, beta-catenin is central both to the transcriptional activation of Wnt [wingless-type MMTV (murine-mammary-tumour virus) integration site family] target genes and as a mediator of cell-cell adhesion. Signals that regulate its levels and subcellular localization are critical. One mechanism of Wnt signalling results in stabilization of beta-catenin protein, which leads to its translocation into the nucleus, where it interacts with TCF (T-cell factor, HMG box) and activates transcription of target genes. Less well understood are mechanisms of Wnt signalling that do not involve beta-catenin stabilization and result in inhibition of beta-catenin-mediated transcription.
Results:
Here, we show that a member of the Wnt protein family, Wnt4 (Wnt, member 4), regulates the subcellular localization of beta-catenin, redirecting it to the cell membrane. Unique among Wnts, this action does not affect the stability of beta-catenin but does prohibit its involvement in TCF gene transactivation.
Conclusions:
This novel mechanism suggests that Wnt4 acts as a switch between the two modes of beta-catenin function, transcriptional activation and cell-cell adhesion.
Insights
Wnt4 protein redirects beta-catenin to the cell membrane, inhibiting its role in gene activation without altering stability. This reveals a new Wnt signaling pathway switching beta-catenin functions.
Area of Science:
- Developmental Biology
- Molecular Biology
- Cell Signaling
Background:
- Beta-catenin is crucial for Wnt target gene transcription and cell-cell adhesion during embryonic development.
- Wnt signaling pathways regulate beta-catenin levels and localization.
- One known pathway stabilizes beta-catenin, promoting nuclear translocation for gene activation.
Purpose of the Study:
- To investigate Wnt signaling mechanisms that do not involve beta-catenin stabilization.
- To understand how Wnt signaling can inhibit beta-catenin-mediated transcription.
Main Methods:
- Investigated the role of Wnt4 in beta-catenin regulation.
- Analyzed beta-catenin subcellular localization and TCF gene transactivation.
Main Results:
- Wnt4 regulates beta-catenin's subcellular localization, moving it to the cell membrane.
- This Wnt4-mediated localization does not affect beta-catenin stability.
- Wnt4 inhibits beta-catenin's involvement in TCF gene transactivation.
Conclusions:
- Wnt4 employs a novel mechanism to regulate beta-catenin function.
- Wnt4 acts as a molecular switch, balancing beta-catenin's roles in transcription and adhesion.
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