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TGF-β signaling regulates DACT1 expression in intestinal epithelial cells
Ji-Lian Wang1, Xin Zhou1, Ling-Fu Zhang1
1Department of General Surgery, Peking University Third Hospital, Beijing 100191, China.
Biomedicine & Pharmacotherapy = Biomedecine & Pharmacotherapie
|November 16, 2017
Summary
Transforming growth factor-beta (TGF-β) upregulates Dishevelled-associated antagonist of 1 (DACT1) expression in intestinal cells. This finding clarifies DACT1 regulation and its role in TGF-β
Area of Science:
- Molecular Biology
- Cellular Signaling
- Developmental Biology
Background:
- Dishevelled-associated antagonist of 1 (DACT1) is implicated in embryonic development and tumorigenesis.
- The regulatory mechanisms governing DACT1 expression remain largely uncharacterized.
- DACT1 antagonizes the Wnt signaling pathway.
Purpose of the Study:
- To elucidate the regulatory factors influencing DACT1 expression.
- To investigate the relationship between TGF-β signaling and DACT1.
- To identify key regulatory regions within the DACT1 promoter.
Main Methods:
- Analysis of DACT1 expression in intestinal epithelial cells under various signaling conditions.
- Reporter assays to map the DACT1 minimal and enhanced promoter regions (-500bp to +1bp and -3000bp to +1bp, respectively).
- Site-directed mutagenesis to pinpoint potential regulatory elements near -335bp.
Main Results:
- Wnt signaling did not significantly affect DACT1 expression.
- Transforming growth factor-beta (TGF-β) treatment markedly increased DACT1 expression in intestinal epithelial cells.
- Promoter analysis identified a minimal promoter region and an enhancer region, with critical elements located near -335bp.
Conclusions:
- TGF-β is a key regulator of DACT1 expression in intestinal epithelial cells.
- The identified promoter regions provide a foundation for understanding DACT1 transcriptional control.
- TGF-β-induced DACT1 upregulation may enhance the inhibition of Wnt signaling, impacting cellular processes.
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