Vascular endothelial growth factor A promoter (VEGFA promoter)

The Vascular endothelial growth factor A (VEGFA) promoter is a critical regulatory DNA sequence located upstream of the VEGFA gene that serves as the primary control point for its expression (Pungliya, W., et al. 2004. Cancer Res). It is highly sensitive to environmental cues, most notably hypoxia, through the binding of Hypoxia-Inducible Factor 1 (HIF-1) to the hypoxia-response element (HRE) (Guo, K., et al. 2008. J Biol Chem). The promoter also contains a polypurine/polypyrimidine tract capable of forming G-quadruplex (G4) structures, which act as molecular switches to regulate transcriptional activity and can be targeted by small molecules like TMPyP4 (Sun, D., et al. 2008. J Am Chem Soc). In many solid tumors, the VEGFA promoter is hyperactivated, leading to the overproduction of VEGF and subsequent pathological neovascularization that supports tumor growth and metastasis. Conversely, in ischemic diseases, therapeutic activation of the promoter using engineered zinc finger proteins, such as SB-509, has been explored to promote revascularization (Sangamo Therapeutics. 2011. ClinicalTrials.gov NCT00852735). Targeting the promoter directly allows for the modulation of all VEGFA isoforms at the source, potentially offering a more comprehensive anti-angiogenic effect than antibodies that target specific protein epitopes. However, therapeutic challenges include ensuring the specificity of DNA-binding agents to avoid off-target effects on other essential gene promoters.

Other names

VEGF promoterVEGFA promoter regionVascular permeability factor promoterVPF promoterVEGFA regulatory region

Transcription modulation via G-quadruplex stabilization to inhibit gene expression, or the use of engineered zinc finger protein transcription factors (ZFP-TFs) to either activate or repress transcription at the genomic level.