Endoglin expression in the endothelium is regulated by Fli-1, Erg, and Elf-1 acting on the promoter and a -8-kb enhancer.
Angiogenesis is critical to the growth and regeneration of tissue but is also a key component of tumor growth and chronic inflammatory disorders. Endoglin plays a key role in angiogenesis by modulating cellular responses to transforming growth factor-beta (TGF-beta) signaling and is upregulated in proliferating endothelial cells. To gain insights into the transcriptional hierarchies that govern endoglin expression, we used a combination of comparative genomic, biochemical, and transgenic approaches. Both the promoter and a region 8 kb upstream of exon 1 were active in transfection assays in endothelial cells. In transgenic mice, the promoter directed low-level expression to a subset of endothelial cells. By contrast, inclusion of the -8 enhancer resulted in robust endothelial activity with additional staining in developing ear mesenchyme. Subsequent molecular analysis demonstrated that both the -8 enhancer and the promoter depend on conserved Ets sites, which were bound in endothelial cells in vivo by Fli-1, Erg, and Elf-1. This study therefore establishes the transcriptional framework within which endoglin functions during angiogenesis.[1]References
- Endoglin expression in the endothelium is regulated by Fli-1, Erg, and Elf-1 acting on the promoter and a -8-kb enhancer. Pimanda, J.E., Chan, W.Y., Donaldson, I.J., Bowen, M., Green, A.R., Göttgens, B. Blood (2006) [Pubmed]
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