title: A hypoxia-inducible vigilant vector system for activating therapeutic genes in ischemia.
abstract: Hypoxia represents an endogenous pathophysiological signal underlying cell growth, adaptation and death in a variety of diseases, including ischemic heart diseases, stroke and solid tumors. A vigilant vector system depends on a gene switch which can sense the hypoxia signal occurring in ischemic events and turn on/off protective gene expressions when necessary. This system uses the oxygen-dependent degradation domain derived from hypoxia-inducible factor 1alpha as the hypoxia sensor and a double-vector system as signal amplifier. For treating ischemic heart diseases, a cardiac-specific MLC-2v promoter is used to deliver transgenes specifically to the heart. When tested in cardiomyocyte cultures, it produced a rapid and robust gene induction upon exposure to low oxygen. In a mouse model for myocardial infarction, the vigilant vectors turned on therapeutic genes such as heme oxygenase-1 in response to ischemia, significantly reduced apoptosis in the infarct area and improved cardiac functions. The hypoxia-regulated gene transfer afforded by the vigilant vectors may provide a powerful tool for delivering therapeutic proteins specifically to ischemic tissues with optimal physiological control.
authors.affiliation: Department of Pediatrics, College of Medicine and All Children's Hospital Research Institute, University of South Florida, St Petersburg, FL 33701, USA.
authors.forename: Y L
authors.initials: YL
authors.lastname: Tang
authors.forename: Y
authors.initials: Y
authors.lastname: Tang
authors.forename: Y C
authors.initials: YC
authors.lastname: Zhang
authors.forename: A
authors.initials: A
authors.lastname: Agarwal
authors.forename: H
authors.initials: H
authors.lastname: Kasahara
authors.forename: K
authors.initials: K
authors.lastname: Qian
authors.forename: L
authors.initials: L
authors.lastname: Shen
authors.forename: M I
authors.initials: MI
authors.lastname: Phillips
mesh_terms: D000818:Animals; D017209:Apoptosis; D002478:Cells, Cultured; D005786:Gene Expression Regulation; D005812:Genes, Switch; D005818:Genetic Engineering; D015316:Genetic Therapy / Q000379:methods*; D005822:Genetic Vectors / Q000008:administration & dosage* / Q000235:genetics; D051547:Heme Oxygenase-1 / Q000235:genetics; D006801:Humans; D000860:Hypoxia; D051795:Hypoxia-Inducible Factor 1, alpha Subunit / Q000235:genetics*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D023421:Models, Animal; D009203:Myocardial Infarction / Q000628:therapy*; D032383:Myocytes, Cardiac / Q000378:metabolism*; D017434:Protein Structure, Tertiary; D051381:Rats; D017207:Rats, Sprague-Dawley; D015533:Transcriptional Activation
chemical_list: C497443:Hif1a protein, mouse; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D051547:Heme Oxygenase-1