A constitutively active hypoxia-inducible factor-1alpha/VP16 hybrid factor activates expression of the human B-type natriuretic peptide gene

Molecular Pharmacology
Yuxia LuoKaren A Vincent

Abstract

Hypoxia-inducible factor-1 (HIF-1) is a primary regulator of the physiological response to hypoxia. A recombinant adenovirus expressing a constitutively active hybrid form of the HIF-1alpha subunit (Ad2/HIF-1alpha/VP16) is being evaluated as a gene therapy for the treatment of peripheral vascular disease. Ad2/HIF-1alpha/VP16 up-regulates known HIF-1-responsive genes, including those involved in angiogenesis. Expression profile analysis revealed that the brain natriuretic peptide (BNP) gene was significantly up-regulated in response to HIF-1alpha/VP16 in human fetal cardiac cells. Real-time reverse transcription-polymerase chain reaction analyses confirmed transcriptional activation of the BNP gene by HIF-1alpha/VP16 in human but not rat cardiac cells. Because hypoxia itself did not increase human BNP gene expression in these analyses, the mechanism of the HIF-1alpha/VP16 effect was determined. Analyses of promoter deletion mutants suggested that the cis-acting sequence in the human BNP promoter mediating activation by HIF-1alpha/VP16 was a putative HIF-1 responsive element (HRE) located at -466. An SV40 basal promoter-luciferase plasmid containing a minimal BNP HRE was up-regulated by HIF-1alpha/VP16, whereas a similar construc...Continue Reading

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Citations

Mar 20, 2010·Journal of Bone and Mineral Metabolism·Andrew J LegerNelson S Yew
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