Nonviral in vivo gene delivery into tumors using a novel low volume jet-injection technology

Gene Therapy
Wolfgang WaltherPeter M Schlag

Abstract

The jet-injection technology has developed as an applicable alternative to viral or liposomal gene delivery systems. In this study a novel, low-volume, 'high-speed jet injector' hand-held system was used for the direct gene transfer of naked DNA into tumors. Lewis-lung carcinoma bearing mice were jet-injected with the beta-galactosidase (LacZ), the green fluorescence (GFP) or the human tumor necrosis factor alpha (TNF-alpha) gene carrying vector plasmids. The animals received five jet injections into the tumor at a pressure of 3.0 bar, delivering 3--5 microl plasmid DNA (1 microg DNA/microl in water) per single jet injection. The jet injection of DNA leads to a widespread expression pattern within tumor tissues with penetration depths of 5--10 mm. Analysis of tumor cryosections revealed moderate LacZ or GFP expression at 48 h and strong reporter gene expression 72 h and 96 h after jet injection. The simultaneous jet injection of the TNF-alpha and LacZ carrying vectors demonstrated efficient expression and secretion of both the cytokine, as well as LacZ expression within the tumor 24 h, 48 h, 72 h, 96 h and 120 h after jet injection. These studies demonstrate the applicability of jet injection for the efficient in vivo gene tran...Continue Reading

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