Lentivirus-Mediated Gene Transfer to Human Epidermis

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Presentation transcript:

Lentivirus-Mediated Gene Transfer to Human Epidermis Soosan Ghazizadeh, Anne B. Katz, Robin Harrington, Lorne B. Taichman  Journal of Investigative Dermatology Symposium Proceedings  Volume 9, Issue 3, Pages 269-275 (September 2004) DOI: 10.1111/j.1087-0024.2004.09302.x Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Lentivirus-mediated transduction of clonogenic keratinocytes in culture. (A) Transduction efficiencies of clonogenic human keratinocytes transduced at multiplicity of infection (MOI) of 0.5, 1, 2, 4, 8 with HR'CMVLZ-SIN (HIVLZ) or MFGLZ were measured by X-gal staining of established colonies of keratinocytes. Error bar indicates standard deviation for each group (n=3) in three separate experiments. (B) Transduced clones were expanded for more than 30 population doublings and β-gal activity in transduced clones (n=18) from each group was quantified by flow cytometry using CMFDG as a substrate and expressed as mean fluorescent intensity. Journal of Investigative Dermatology Symposium Proceedings 2004 9, 269-275DOI: (10.1111/j.1087-0024.2004.09302.x) Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Post-transcriptional control of lentiviral-mediated transgene expression in keratinocytes. Human keratinocytes were transduced with MFGLZ or HIVLZ at an MOI of 10 (95%–96% expressing lacZ). Transduced cells were expanded and used for comparative protein, DNA and RNA analyses. Non-transduced was used as a control. (A) β-gal activity in control and transduced keratinocytes was analyzed by flow cytometry and expressed as MFI. (B) Southern analysis of genomic DNA isolated from control and transduced keratinocytes as indicated in the figure and hybridized with a lacZ-specific probe. (C) Total RNA isolated from non-transduced (lane 1), MFGLZ- (lane 2) and HIVLZ-transduced keratinocytes (lane 3) and steady-state mRNA levels for lacZ and β-actin were measured by hybridizing 10 μg total cellular RNA with specific antisense riboprobes (a 635-nt for lacZ and 270-nt for β-actin). RNase protected fragments were analyzed by electrophoresis on a 5% denaturing polyacrylamide gel. Journal of Investigative Dermatology Symposium Proceedings 2004 9, 269-275DOI: (10.1111/j.1087-0024.2004.09302.x) Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 Histochemical staining of grafted tissue for β-gal expression. Organotypic raft cultures were constructed with MFGLZ-transduced keratinocytes (A and B) or HIVLZ-transduced keratinocytes (C and D) and were grafted onto athymic mice. Twenty weeks later tissue was excised and cryosections were examined for β-gal expression by staining with X-gal for 1 h (A and C) or 3 h (B and D). β-gal expressing cells are stained blue. Note lacZ expression in the transitional and cornified layers of epidermis in C. Sections were counterstained with H&E. Bar represents 50 μm. Journal of Investigative Dermatology Symposium Proceedings 2004 9, 269-275DOI: (10.1111/j.1087-0024.2004.09302.x) Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 WPRE enhances lentivirus-mediated transgene expression. (A) Kertinocytes were transduced with HR'CMV-GFP or HR'CMV-GFP-WPRE at an MOI of 0.3 or 3. Three days post-transduction, GFP expression in HR'CMV-GFP-transduced cells (black bars) was compared with that of HR'CMV-GFP-WPRE-transduced cells (gray bars). The percent GFP positive cells in each population is stated above the bars. This is a representative of three independent experiments. (B and C) Three-dimensional raft cultures of human keratinocytes were constructed using keratinocytes transduced with HR'CMV-GFP (B) or HR'CMV-GFP-WPRE (C) at an MOI of 3. Rafts were fixed, cryopreserved and sections were counterstained with DAPI (blue nuclear staining) and analyzed for green fluorescent (green). The position of basement membrane is indicated with a dotted line. The bar represents 50 μm. Journal of Investigative Dermatology Symposium Proceedings 2004 9, 269-275DOI: (10.1111/j.1087-0024.2004.09302.x) Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 5 In vivo transduction of xenograted human epidermis with LVV. Human foreskin grafts were injected intradermally with HR'CMV-GFP-WPRE (5 × 106 transducing units in 20 μL) and GFP expression was assessed in live animals using a fluorescent stereoscope (A and B). The boxed region in A is shown at higher magnification in B to show GFP-expressing corneocytes. At 12 wk post-transduction transduced skin was excised, fixed and cryosections were examined by fluorescent microscopy. Extensive GFP expression in the epidermis is shown in C. A column of GFP expressing cells representing an epidermal proliferative unit is shown in D. Tissue sections were counterstained with DAPI (blue nuclear staining). In C and D, the position of basement membrane is denoted with a dotted line. Bar represents 1.2 mm for A, 200 μm for B, and 50 μm for C and D. Journal of Investigative Dermatology Symposium Proceedings 2004 9, 269-275DOI: (10.1111/j.1087-0024.2004.09302.x) Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions