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• W2078396087 startingPage "1469" @default.
• W2078396087 abstract "The vessel wall fibrinolytic system plays an important role in maintaining the arterial phenotype and in regulating the arterial response to injury. Plasminogen activator inhibitor type 1 (PAI-1) regulates tissue fibrinolysis and is expressed in arterial tissue; however, its biological role remains uncertain. To help elucidate the role of PAI-1 in the artery wall, and to begin to clarify whether manipulation of vascular PAI-1 expression might be a target for gene therapy, we used adenoviral vectors to increase expression of rat PAI-1 in rat carotid arteries. Infusion of an adenoviral vector in which PAI-1 expression was driven by a promoter derived from the Rous sarcoma virus (RSV) did not increase PAI-1 expression above endogenous levels. To improve PAI-1 expression, we modified the vector by (1) truncating the 3' untranslated region of PAI-1 to increase the mRNA half-life, (2) substituting the SRalpha or the cytomegalovirus (CMV) promoter for the RSV promoter, (3) including an intron in the expression cassette, and (4) altering the direction of transcription of the transgene cassette. The optimal expression vector, revealed by in vitro studies, contained the CMV promoter, an intron, and a truncated PAI-1 mRNA. This vector increased PAI-1 expression by 30-fold over control levels in vitro and by 1.6 to 2-fold over endogenous levels in vivo. This vector will be useful for elucidating the role of PAI-1 in arterial pathobiology. Because genes that are important in maintaining the vascular phenotype are likely to be expressed in the vasculature, the technical issues of how to increase in vivo expression of endogenous genes are highly relevant to the development of genetic therapies for vascular disease." @default.
• W2078396087 created "2016-06-24" @default.
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• W2078396087 date "1999-06-10" @default.
• W2078396087 modified "2023-10-13" @default.
• W2078396087 title "Optimizing Vascular Gene Transfer of Plasminogen Activator Inhibitor 1" @default.
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• W2078396087 doi "https://doi.org/10.1089/10430349950017806" @default.
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