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BMP promotes motility and represses growth of smooth muscle cells by activation of tandem Wnt pathways

BMP promotes motility and represses growth of smooth muscle cells by activation of tandem Wnt pathways
We present a novel cell-signaling paradigm in which bone morphogenetic protein 2 (BMP-2) consecutively and interdependently activates the wingless (Wnt)–β-catenin (βC) and Wnt–planar cell polarity (PCP) signaling pathways to facilitate vascular smooth muscle motility while simultaneously suppressing growth. We show that BMP-2, in a phospho-Akt–dependent manner, induces βC transcriptional activity to produce fibronectin, which then activates integrin-linked kinase 1 (ILK-1) via α4-integrins. ILK-1 then induces the Wnt–PCP pathway by binding a proline-rich motif in disheveled (Dvl) and consequently activating RhoA-Rac1–mediated motility. Transfection of a Dvl mutant that binds βC without activating RhoA-Rac1 not only prevents BMP-2–mediated vascular smooth muscle cell motility but promotes proliferation in association with persistent βC activity. Interfering with the Dvl-dependent Wnt–PCP activation in a murine stented aortic graft injury model promotes extensive neointima formation, as shown by optical coherence tomography and histopathology. We speculate that, in response to injury, factors that subvert BMP-2–mediated tandem activation of Wnt–βC and Wnt–PCP pathways contribute to obliterative vascular disease in both the systemic and pulmonary circulations.
- Baylor College of Medicine United States
- University of British Columbia Canada
- Department of Biochemistry and Molecular Biology-University of British Columbia Canada
- University of British Colombia Canada
- Stanford University United States
Glycogen Synthase Kinase 3 beta, Myocytes, Smooth Muscle, Becaplermin, Dishevelled Proteins, Bone Morphogenetic Protein 2, Bone Morphogenetic Protein Receptors, Type II, Models, Biological, Fibronectins, Enzyme Activation, Glycogen Synthase Kinase 3, Mice, Axin Protein, Cell Movement, Neointima, Animals, Humans, Mutant Proteins, Research Articles, Aorta, Adaptor Proteins, Signal Transducing, Cell Proliferation
Glycogen Synthase Kinase 3 beta, Myocytes, Smooth Muscle, Becaplermin, Dishevelled Proteins, Bone Morphogenetic Protein 2, Bone Morphogenetic Protein Receptors, Type II, Models, Biological, Fibronectins, Enzyme Activation, Glycogen Synthase Kinase 3, Mice, Axin Protein, Cell Movement, Neointima, Animals, Humans, Mutant Proteins, Research Articles, Aorta, Adaptor Proteins, Signal Transducing, Cell Proliferation
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