β-Catenin C-terminal signals suppress p53 and are essential for artery formation

Dario F. Riascos-Bernal, Prameladevi Chinnasamy, Longyue (Lily) Cao, Charlene M. Dunaway, Tomas Valenta, Konrad Basler and Nicholas E. S. Sibinga ()
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Dario F. Riascos-Bernal: and Wilf Family Cardiovascular Research Institute, Albert Einstein College of Medicine
Prameladevi Chinnasamy: and Wilf Family Cardiovascular Research Institute, Albert Einstein College of Medicine
Longyue (Lily) Cao: and Wilf Family Cardiovascular Research Institute, Albert Einstein College of Medicine
Charlene M. Dunaway: and Wilf Family Cardiovascular Research Institute, Albert Einstein College of Medicine
Tomas Valenta: Institute of Molecular Life Sciences, University of Zurich
Konrad Basler: Institute of Molecular Life Sciences, University of Zurich
Nicholas E. S. Sibinga: and Wilf Family Cardiovascular Research Institute, Albert Einstein College of Medicine

Nature Communications, 2016, vol. 7, issue 1, 1-14

Abstract: Abstract Increased activity of the tumour suppressor p53 is incompatible with embryogenesis, but how p53 is controlled is not fully understood. Differential requirements for p53 inhibitors Mdm2 and Mdm4 during development suggest that these control mechanisms are context-dependent. Artery formation requires investment of nascent endothelial tubes by smooth muscle cells (SMCs). Here, we find that embryos lacking SMC β-catenin suffer impaired arterial maturation and die by E12.5, with increased vascular wall p53 activity. β-Catenin-deficient SMCs show no change in p53 levels, but greater p53 acetylation and activity, plus impaired growth and survival. In vivo, SMC p53 inactivation suppresses phenotypes caused by loss of β-catenin. Mechanistically, β-catenin C-terminal interactions inhibit Creb-binding protein-dependent p53 acetylation and p53 transcriptional activity, and are required for artery formation. Thus in SMCs, the β-catenin C-terminus indirectly represses p53, and this function is essential for embryogenesis. These findings have implications for angiogenesis, tissue engineering and vascular disease.

Date: 2016
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DOI: 10.1038/ncomms12389

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