Efficient Expression of Naked Plasmid DNA in Mucosal Epithelium: Prospective for the Treatment of Skin Lesions  Ulrich R. Hengge  Journal of Investigative.

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Efficient Expression of Naked Plasmid DNA in Mucosal Epithelium: Prospective for the Treatment of Skin Lesions  Ulrich R. Hengge  Journal of Investigative Dermatology  Volume 111, Issue 4, Pages 605-608 (October 1998) DOI: 10.1046/j.1523-1747.1998.00353.x Copyright © 1998 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Mucosal epitheliae cells expressing β-Gal move upward with time. (a) Gross section of mucosal epithelia (8 mm punch biopsy) 12 h after injection of 20 μg of β-Gal plasmid DNA to two different sites (scale bar: 1 mm); (b) histologic section of an injected and stained biopsy 3 h after injection of β-Gal plasmid DNA shows blue staining (β-Gal protein) in basal and suprabasal layers of the mucosa with absent staining in the spinous and granular layers (scale bar: 100 μm); (c) histologic section of injected mucosa 24 h after β-Gal plasmid DNA injection demonstrating β-Gal staining only in the most superficial mucosal layers (scale bar: 50 μm); (d) histologic section of porcine epidermis 24 h after injection showing abundant β-Gal protein in keratinocytes in all epidermal layers (scale bar: 50 μm). Journal of Investigative Dermatology 1998 111, 605-608DOI: (10.1046/j.1523-1747.1998.00353.x) Copyright © 1998 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Quantitative time course of β-Gal expression in dog mucosa. The amounts of β-Gal protein were measured over time in 8 mm epithelial sheets using a chemiluminescent assay. Six to eight independent samples were analyzed per time point. Error bars: means ± SD. Journal of Investigative Dermatology 1998 111, 605-608DOI: (10.1046/j.1523-1747.1998.00353.x) Copyright © 1998 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 Oral papillomas take up and express intralesionally injected β-Gal indicator plasmid DNA. Two to four centimeter papilloma lesions on the gums of 2–4 mo old beagles were injected with 20 μg β-Gal plasmid DNA. (a) β-Gal activity could be detected grossly 12 h after injection (scale bar: 1 mm); (b) on histologic examination, β-Gal protein was detected 12 h after injection in the most superficial layers, consistent with the increased turnover in a hyperproliferative epithelial lesion (scale bar: 50 μm); (c) gross impression of pcDNA3 control DNA-injected papilloma upon analysis for β-Gal activity (scale bar: 1 mm); (d) histologic evaluation did not reveal any blue staining (β-Gal activity) (scale bar: 100 μm). Journal of Investigative Dermatology 1998 111, 605-608DOI: (10.1046/j.1523-1747.1998.00353.x) Copyright © 1998 The Society for Investigative Dermatology, Inc Terms and Conditions