Smad7 and PP1α Control TGF-β/ALK1 Signaling in Endothelial Cells
Author Information
Author(s): Valdimarsdottir Gudrun, Goumans Marie-José, Itoh Fumiko, Itoh Susumu, Heldin Carl-Henrik, Dijke Peter ten
Primary Institution: Dept. of Biochemistry and Molecular Biology, Faculty of Medicine, University of Iceland
Hypothesis
Smad7 and protein phosphatase 1α (PP1α) are critical determinants in the duration of TGF-β/ALK1 signaling in endothelial cells.
Conclusion
Smad7 recruits PP1α to ALK1, inhibiting TGF-β/ALK1-induced Smad1/5 phosphorylation.
Supporting Evidence
- Smad7 and PP1α mRNA expression levels were specifically upregulated by TGF-β/ALK1.
- Ectopic expression of Smad7 or PP1α inhibited TGF-β/ALK1-induced Smad1/5 phosphorylation.
- Knockdown of Smad7 or PP1α enhanced TGF-β/ALK1-induced signaling responses.
- PP1α interacted with ALK1, and this association was potentiated by Smad7.
Takeaway
This study shows that a protein called Smad7 helps control how long a signal from TGF-β lasts in certain cells, which is important for their behavior.
Methodology
The study involved treating endothelial cells with TGF-β and analyzing the effects on Smad phosphorylation and signaling pathways.
Digital Object Identifier (DOI)
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