title: Targeting alphavbeta3 and alpha5beta1 for gene delivery to proliferating VSMCs: synergistic effect of TGF-beta1.
abstract: TGF-beta1 levels increase after vascular injury and promote vascular smooth muscle cell (VSMC) proliferation. We define a nonviral gene delivery system that targets alphavbeta3 and alpha5beta1 integrins that are expressed on proliferating VSMCs and strongly induced by TGF-beta1. A 15-amino acid RGDNP-containing peptide from American Pit Viper venom was linked to a Lys(16) peptide as vector (molossin vector) and complexed with Lipofectamine or fusogenic peptide for delivery of luciferase or beta-galactosidase reporter genes to primary cultures of human, rabbit, and rat VSMCs. Preincubation of VSMCs with TGF-beta1 for 24 h, but not with PDGF-BB, interferon-gamma, TNF-alpha, nor PMA, increased alphavbeta3 and alpha5beta1 expressions on VSMCs and enhanced gene delivery of molossin vector. Thus beta-galactosidase activity increased from 35 +/- 5% (controls) to 75 +/- 5% after TGF-beta1 treatment, and luciferase activity increased fourfold over control values. Potential use of this system in vessel bypass surgery was examined in an ex vivo rat aortic organ culture model after endothelial damage. Molossin vector system delivered beta-galactosidase to VSMCs in the vessel wall that remained for up to 12 days posttransfection. The molossin vector system, when combined with TGF-beta1, enhances gene delivery to proliferating VSMCs and might have clinical applications for certain vasculoproliferative diseases.
authors.affiliation: Department of Cardiology, Institute of Liver Studies, King's College London, London SE5 9PJ, UK.
authors.forename: Jian-Mei
authors.initials: JM
authors.lastname: Li
authors.forename: Lampson M
authors.initials: LM
authors.lastname: Fan
authors.forename: Ajay
authors.initials: A
authors.lastname: Shah
authors.forename: Gavin
authors.initials: G
authors.lastname: Brooks
mesh_terms: D001011:Aorta / Q000166:cytology; D002455:Cell Division; D002478:Cells, Cultured; D004357:Drug Synergism; D015870:Gene Expression; D018014:Gene Transfer Techniques; D005822:Genetic Vectors; D006801:Humans; D039081:Integrin alpha5beta1 / Q000235:genetics*; D039302:Integrin alphaVbeta3 / Q000235:genetics*; D009131:Muscle, Smooth, Vascular / Q000166:cytology / Q000502:physiology*; D009842:Oligopeptides / Q000494:pharmacology; D009924:Organ Culture Techniques; D014162:Transfection / Q000379:methods; D016212:Transforming Growth Factor beta / Q000494:pharmacology*; D053773:Transforming Growth Factor beta1
chemical_list: D039081:Integrin alpha5beta1; D039302:Integrin alphaVbeta3; D009842:Oligopeptides; C508960:TGFB1 protein, human; C508962:Tgfb1 protein, rat; D016212:Transforming Growth Factor beta; D053773:Transforming Growth Factor beta1; C418682:molossin peptide