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Watanabe Y, Seya D, Ihara D, Ishii S, Uemoto T, Kubo A, Arai Y, Isomoto Y, Nakano A, Abe T, Shigeta M, Kawamura T, Saito Y, Ogura T, Nakagawa O. Importance of endothelial Hey1 expression for thoracic great vessel development and its distal enhancer for Notch-dependent endothelial transcription. J Biol Chem 2020; 295:17632-17645. [PMID: 33454003 PMCID: PMC7762959 DOI: 10.1074/jbc.ra120.015003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 10/12/2020] [Indexed: 12/19/2022] Open
Abstract
Thoracic great vessels such as the aorta and subclavian arteries are formed through dynamic remodeling of embryonic pharyngeal arch arteries (PAAs). Previous work has shown that loss of a basic helix-loop-helix transcription factor Hey1 in mice causes abnormal fourth PAA development and lethal great vessel anomalies resembling congenital malformations in humans. However, how Hey1 mediates vascular formation remains unclear. In this study, we revealed that Hey1 in vascular endothelial cells, but not in smooth muscle cells, played essential roles for PAA development and great vessel morphogenesis in mouse embryos. Tek-Cre-mediated Hey1 deletion in endothelial cells affected endothelial tube formation and smooth muscle differentiation in embryonic fourth PAAs and resulted in interruption of the aortic arch and other great vessel malformations. Cell specificity and signal responsiveness of Hey1 expression were controlled through multiple cis-regulatory regions. We found two distal genomic regions that had enhancer activity in endothelial cells and in the pharyngeal epithelium and somites, respectively. The novel endothelial enhancer was conserved across species and was specific to large-caliber arteries. Its transcriptional activity was regulated by Notch signaling in vitro and in vivo, but not by ALK1 signaling and other transcription factors implicated in endothelial cell specificity. The distal endothelial enhancer was not essential for basal Hey1 expression in mouse embryos but may likely serve for Notch-dependent transcriptional control in endothelial cells together with the proximal regulatory region. These findings help in understanding the significance and regulation of endothelial Hey1 as a mediator of multiple signaling pathways in embryonic vascular formation.
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Affiliation(s)
- Yusuke Watanabe
- Department of Molecular Physiology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka, Japan; Graduate School of Medical Sciences, Nara Medical University, Kashihara, Nara, Japan.
| | - Daiki Seya
- Department of Molecular Physiology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka, Japan
| | - Dai Ihara
- Department of Molecular Physiology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka, Japan; Laboratory of Stem Cell and Regenerative Medicine, Department of Biomedical Sciences, College of Life Sciences, Ritsumeikan University, Kusatsu, Shiga, Japan
| | - Shuhei Ishii
- Department of Molecular Physiology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka, Japan; Graduate School of Medical Sciences, Nara Medical University, Kashihara, Nara, Japan
| | - Taiki Uemoto
- Department of Molecular Physiology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka, Japan; Graduate School of Medical Sciences, Nara Medical University, Kashihara, Nara, Japan
| | - Atsushi Kubo
- Department of Developmental Neurobiology, Institute of Development, Aging, and Cancer, Tohoku University, Sendai, Miyagi, Japan
| | - Yuji Arai
- Department of Molecular Physiology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka, Japan; Laboratory of Animal Experiment and Medical Management, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka, Japan
| | - Yoshie Isomoto
- Laboratory of Animal Experiment and Medical Management, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka, Japan
| | - Atsushi Nakano
- Laboratory of Animal Experiment and Medical Management, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka, Japan
| | - Takaya Abe
- Laboratory for Animal Resources and Genetic Engineering, RIKEN Center for Biosystems Dynamics Research, Kobe, Japan
| | - Mayo Shigeta
- Laboratory for Animal Resources and Genetic Engineering, RIKEN Center for Biosystems Dynamics Research, Kobe, Japan
| | - Teruhisa Kawamura
- Laboratory of Stem Cell and Regenerative Medicine, Department of Biomedical Sciences, College of Life Sciences, Ritsumeikan University, Kusatsu, Shiga, Japan
| | - Yoshihiko Saito
- Graduate School of Medical Sciences, Nara Medical University, Kashihara, Nara, Japan; Department of Cardiovascular Medicine, Nara Medical University, Kashihara, Nara, Japan
| | - Toshihiko Ogura
- Department of Developmental Neurobiology, Institute of Development, Aging, and Cancer, Tohoku University, Sendai, Miyagi, Japan
| | - Osamu Nakagawa
- Department of Molecular Physiology, National Cerebral and Cardiovascular Center Research Institute, Suita, Osaka, Japan; Graduate School of Medical Sciences, Nara Medical University, Kashihara, Nara, Japan.
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