Menadione and ethacrynic acid inhibit the hypoxia-inducible factor (HIF) pathway by disrupting HIF-1α interaction with p300.
Hypoxia is a general characteristic of most solid malignancies and intimately related to neoplastic diseases and cancer progression. Homeostatic response to hypoxia is primarily mediated by hypoxia inducible factor (HIF)-1α that elicits transcriptional activity through recruitment of the CREB binding protein (CBP)/p300 coactivator. Targeted blockade of HIF-1α binding to CBP/p300 ... would thus constitute a novel approach for cancer treatment by suppressing tumor angiogenesis and metastasis. Here, we identified inhibitors against the interaction between HIF-1α and p300 by a fluorescence polarization-based assay employing a fluorescently-labeled peptide containing the C-terminal activation domain of HIF-1α. Two small molecule inhibitors, menadione (MD) and ethacrynic acid (EA), were found to decrease expression of luciferase under the control of hypoxia-responsive elements in hypoxic cells as well as to efficiently block the interaction between the full-length HIF-1α and p300. While these compounds did not alter the expression level of HIF-1α, they down-regulated expression of a HIF-1α target vascular endothelial growth factor (VEGF) gene. Considering hypoxia-induced VEGF expression leading to highly aggressive tumor growth, MD and EA may provide new scaffolds for development of tumor therapeutic reagents as well as tools for a better understanding of HIF-1α-mediated hypoxic regulation.
Mesh Terms:
Binding Sites, Cell Hypoxia, Cell Survival, Dose-Response Relationship, Drug, E1A-Associated p300 Protein, Ethacrynic Acid, Gene Expression, HeLa Cells, Humans, Hypoxia-Inducible Factor 1, alpha Subunit, Immunoblotting, Luciferases, Molecular Structure, Protein Binding, Protein Interaction Mapping, Response Elements, Reverse Transcriptase Polymerase Chain Reaction, Signal Transduction, Vascular Endothelial Growth Factor A, Vitamin K 3
Binding Sites, Cell Hypoxia, Cell Survival, Dose-Response Relationship, Drug, E1A-Associated p300 Protein, Ethacrynic Acid, Gene Expression, HeLa Cells, Humans, Hypoxia-Inducible Factor 1, alpha Subunit, Immunoblotting, Luciferases, Molecular Structure, Protein Binding, Protein Interaction Mapping, Response Elements, Reverse Transcriptase Polymerase Chain Reaction, Signal Transduction, Vascular Endothelial Growth Factor A, Vitamin K 3
Biochem. Biophys. Res. Commun.
Date: May. 17, 2013
PubMed ID: 23618863
View in: Pubmed Google Scholar
Download Curated Data For This Publication
170857
Switch View:
- Interactions 2