Molecular Therapy - Nucleic Acids

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Molecular Therapy - Nucleic Acids Intradermal Delivery of Synthetic mRNA Using Hollow Microneedles for Efficient and Rapid Production of Exogenous Proteins in Skin  Sonia Golombek, Martin Pilz, Heidrun Steinle, Efrat Kochba, Yotam Levin, Dominique Lunter, Christian Schlensak, Hans Peter Wendel, Meltem Avci-Adali  Molecular Therapy - Nucleic Acids  Volume 11, Pages 382-392 (June 2018) DOI: 10.1016/j.omtn.2018.03.005 Copyright © 2018 The Authors Terms and Conditions

Figure 1 Analysis of the Generated PCR Product, Synthetic hGLuc mRNA, and Cy3-Labeled mRNA, by 1% Agarose Gel Electrophoresis (A) 200 ng hGLuc DNA (left) or hGLuc mRNA (right) was loaded on 1% agarose gel. The purity and the specific length of the PCR product and synthetic mRNA were confirmed by a single band at around 900 bases. (B) First, Cy3-labeled mRNA was detected using an UV transilluminator, and then all nucleic acids were detected by GelRed staining. Molecular Therapy - Nucleic Acids 2018 11, 382-392DOI: (10.1016/j.omtn.2018.03.005) Copyright © 2018 The Authors Terms and Conditions

Figure 2 Detection of Luciferase Activity after Transfection of HEK923 Cells with Synthetic hGLuc mRNA 3 × 105 HEK293 cells were incubated for 4 hr at 37°C with 0.2, 0.5, or 1.5 μg mRNA complexed with Lipofectamine 2000. Then transfection complexes were discarded, and fresh medium was added to the cells. After 24 hr, the luciferase activity (RLUs) was detected in the supernatants and cell lysates. Cells treated with medium or medium and Lipofectamine 2000 (L2000) served as negative controls. Results are shown as mean ± SEM (n = 3). Statistical differences were determined using two-way ANOVA followed by Bonferroni’s multiple comparisons test (**p < 0.01, ***p < 0.001, ****p < 0.0001). Molecular Therapy - Nucleic Acids 2018 11, 382-392DOI: (10.1016/j.omtn.2018.03.005) Copyright © 2018 The Authors Terms and Conditions

Figure 3 Delivery of Synthetic hGLuc mRNA into Porcine Skin Using Hollow Microneedles and Analysis of Protein Expression (1) Porcine skin detached from the outer side of pigs’ ears was trimmed and punched into 1-mm-thick pieces with 1.5-cm diameter and disinfected. The structure of the skin is shown schematically. S.c., stratum corneum; E, epidermis; D, dermis. (2) Lipoplexes were generated by incubation of 1.5 μg hGLuc mRNA with 1.5 μl Lipofectamine 2000 in a total volume of 35 μL OptiMEM I reduced serum-free medium for 20 min at RT. The mixture was injected into the skin using MicronJet600 microneedles. (3) After washing with DPBS, the skin was transferred into a ThinCert insert, which served as a permeable barrier between the skin and the surrounding medium. (4) The skin was incubated air-exposed in 1.5 mL human endothelial cell culture medium in one well of a 12-well plate from 24 to 72 hr at 37°C and 5% CO2. The microinjected lipoplexes can enter the cells via endocytosis. After the release of mRNA into the cytosol, mRNA is translated by ribosomes into protein. (5) After the appropriate incubation time, the produced hGLuc protein is detected by luciferase assay in the surrounding medium as well as in the skin. Molecular Therapy - Nucleic Acids 2018 11, 382-392DOI: (10.1016/j.omtn.2018.03.005) Copyright © 2018 The Authors Terms and Conditions

Figure 4 Analysis of Injection Depth after Delivery of Metallic Microspheres into Pig Skin Paraffin-embedded porcine skin sections microinjected with metallic microspheres were stained with H&E. Non-injected skin pieces served as controls. The upper layer of the skin, the stratum corneum (S.c.) (20–30 μm) forms a protective barrier for the underlying epidermis (E) (50–200 μm) and the following dermis (D). The arrow indicates the injection site of the beads. The injected beads were detected approximately 600 μm under the skin surface. Nuclei, blue-purple; cytoplasm, red; collagen, light pink; erythrocytes, cherry red; microspheres, brown. Molecular Therapy - Nucleic Acids 2018 11, 382-392DOI: (10.1016/j.omtn.2018.03.005) Copyright © 2018 The Authors Terms and Conditions

Figure 5 Detection of Microinjected Cy3-Labeled hGLuc mRNA in Porcine Skin Samples were fixed 4 hr after microinjection of 1.5 μg Cy3-labeled hGLuc mRNA in 4% paraformaldehyde. Paraffin-embedded tissues were sectioned at a thickness of 2.5 μm and stained with DAPI. Representative pictures of 3 experiments are presented. BF, bright field; DAPI, blue; Cy3 hGLuc mRNA, red. Molecular Therapy - Nucleic Acids 2018 11, 382-392DOI: (10.1016/j.omtn.2018.03.005) Copyright © 2018 The Authors Terms and Conditions

Figure 6 Detection of Luciferase Activity after Microinjection of Synthetic hGLuc mRNA into Porcine Skin (A) Luciferase activity was determined in medium (n = 4) and skin lysates (n = 5) 24, 48, and 72 hr after microinjection of 1.5 μg hGLuc mRNA complexed with Lipofectamine 2000 (L200) (B) Additionally, 1.5 μg hGLuc mRNA was injected without Lipofectamine 2000 complexation, referred to as naked mRNA, into the skin (n = 3). The medium was collected, and fresh medium was added every 24 hr. Luciferase activity was determined in the collected medium. Skin pieces injected with only medium or medium plus Lipofectamine 2000 served as controls. Results are presented as mean ± SEM. Statistical differences were determined using two-way ANOVA followed by Bonferroni’s multiple comparisons test (*p < 0.05, **p < 0.01, ***p < 0.001, ****p < 0.0001). Molecular Therapy - Nucleic Acids 2018 11, 382-392DOI: (10.1016/j.omtn.2018.03.005) Copyright © 2018 The Authors Terms and Conditions