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XB-ART-39225
Development April 1, 2009; 136 (7): 1115-25.

Kruppel-like factor 2 cooperates with the ETS family protein ERG to activate Flk1 expression during vascular development.



Abstract
The VEGF receptor, FLK1, is essential for differentiation of the endothelial lineage and for embryonic vascular development. Using comparative genomics, we have identified conserved ETS and Krüppel-like factor (KLF) binding sites within the Flk1 enhancer. In transgenic studies, mutation of either site results in dramatic reduction of Flk1 reporter expression. Overexpression of KLF2 or the ETS transcription factor ERG is sufficient to induce ectopic Flk1 expression in the Xenopus embryo. Inhibition of KLF2 function in the Xenopus embryo results in a dramatic reduction in Flk1 transcript levels. Furthermore, we show that KLF2 and ERG associate in a physical complex and that the two proteins synergistically activate transcription of Flk1. Since the ETS and KLF protein families have independently been recognized as important regulators of endothelial gene expression, cooperation between the two families has broad implications for gene regulation during development, normal physiology and vascular disease.

PubMed ID: 19244281
PMC ID: PMC2685932
Article link: Development
Grant support: [+]

Species referenced: Xenopus laevis
Genes referenced: apln aplnr cdh5 erg kdr klf2 vegfa
Morpholinos: klf2 MO1


Article Images: [+] show captions
References [+] :
Atkins, Role of Krüppel-like transcription factors in endothelial biology. 2007, Pubmed