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• W2129206121 abstract "Rationale: Cardiovascular health depends on proper development and integrity of blood vessels. Ets variant 2 (Etv2), a member of the E26 transforming–specific family of transcription factors, is essential to initiate a transcriptional program leading to vascular morphogenesis in early mouse embryos. However, endothelial expression of the Etv2 gene ceases at midgestation; therefore, vascular development past this stage must continue independent of Etv2. Objective: To identify molecular mechanisms underlying transcriptional regulation of vascular morphogenesis and homeostasis in the absence of Etv2. Methods and Results: Using loss- and gain-of-function strategies and a series of molecular techniques, we identify Friend leukemia integration 1 ( Fli1 ), another E26 transforming–specific family transcription factor, as a downstream target of Etv2. We demonstrate that Etv2 binds to conserved Ets-binding sites within the promoter region of the Fli1 gene and governs Fli1 expression. Importantly, in the absence of Etv2 at midgestation, binding of Etv2 at Ets-binding sites in the Fli1 promoter is replaced by Fli1 protein itself, sustaining expression of Fli1 as well as selective Etv2-regulated endothelial genes to promote endothelial cell survival and vascular integrity. Consistent with this, we report that Fli1 binds to the conserved Ets-binding sites within promoter and enhancer regions of other Etv2-regulated endothelial genes, including Tie2 , to control their expression at and beyond midgestation. Conclusions: We have identified a novel positive feed-forward regulatory loop in which Etv2 activates expression of genes involved in vasculogenesis, including Fli1 . Once the program is activated in early embryos, Fli1 then takes over to sustain the process in the absence of Etv2." @default.
• W2129206121 created "2016-06-24" @default.
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• W2129206121 date "2014-05-23" @default.
• W2129206121 modified "2023-10-09" @default.
• W2129206121 title "Fli1 Acts Downstream of Etv2 to Govern Cell Survival and Vascular Homeostasis via Positive Autoregulation" @default.
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• W2129206121 doi "https://doi.org/10.1161/circresaha.1134303145" @default.
• W2129206121 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4080722" @default.
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