BMB Rep. 2015; 48(8): 429-430  
Roles of YAP in mediating endothelial cell junctional stability and vascular remodeling
Hyun-Jung Choi1 & Young-Guen Kwon2,*
1Severance Integrative Research Institute for Cerebral & Cardiovascular Diseases (SIRIC), College of Medicine, Yonsei University, 2Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul 03722, Korea
Correspondence to: E-mail: ygkwon@yonsei.ac.kr
Received: July 9, 2015; Published online: August 31, 2015.
© Korean Society for Biochemistry and Molecular Biology. All rights reserved.

Abstract
Angiogenesis is a complex process involving dynamic interaction of various cell to cell interactions. Endothelial cell interactions regulated by growth factors, inflammatory cytokines, or hemodynamic stress are critical for balancing vascular quiescence and activation. Yes-associated protein (YAP), an effector of Hippo signaling, is known to play significant roles in maintaining cellular homeostasis. However, its role in endothelial cells for angiogenic regulation remains relatively unexplored. We demonstrated the critical role of YAP in vascular endothelial cells and elucidated the underlying molecular mechanisms involved in angiogenic regulation of YAP. YAP was expressed in active angiogenic regions where endothelial cell junctions were relatively loosened. Consistently, YAP subcellular localization and activity were regulated by VE-cadherin-mediated PI3K/Akt pathway. YAP thereby regulated endothelial sprouting via angiopoietin-2 expression. These results provide an insight into a model of coordinating endothelial junctional stability and angiogenic activation through YAP.
Keywords: YAP, ANG-2, VE-cadherin, Akt, Endothelial junction, Angiogenesis


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