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LDB2 regulates the expression of DLL4 through the formation of oligomeric complexes in endothelial cells
Hyun-Jung Choi1,*,#, Seung-Sik Rho2, Dong-Hoon Choi2, Young-Guen Kwon2,#
1Severance Integrative Research Institute for Cerebral & Cardiovascular Disease (SIRIC), Yonsei University, College of Medicine,
2Department of Biochemistry, Yonsei University, College of Life Science and Biotechnology
Abstract
Delta-like ligand 4 (DLL4) expression in endothelial cells is intimately associated with angiogenic sprouting and vascular remodeling, but the precise mechanism of transcriptional regulation of DLL4 remains incompletely understood. Here, we showed that LIM-domain binding protein 2 (LDB2) plays an important role in regulating basal DLL4 and VEGF-induced DLL4 expression. Knockdown of LDB2 using siRNA enhanced endothelial sprouting and tubular network formation in vitro. Silencing of LDB2 expression in endothelial cells decreased DLL4 expression. Conversely, LDB2 overexpression increased it. LDB2 regulated DLL4 promoter activity by binding to its promoter region and the same promoter region was occupied and regulated by the LMO2/TAL-1/GATA2 complex. Interestingly, LDB2 also mediated VEGF-induced DLL4 expression in endothelial cells, and the LDB2 oligomerization domain was required for this activity. The regulation of DLL4 by the LDB2 complex provides a novel mechanism of DLL4 transcriptional control that may be exploited to develop therapeutics for aberrant vascular remodeling.
Abstract, Accepted Manuscript(in press) [Submitted on July 21, 2017, Accepted on September 14, 2017]
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