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The extra- and intracellular barriers to lipid and adenovirus-mediated pulmonary gene transfer in native sheep airway epithelium

Gene Therapy volume 6, pages 534–546 (1999)Cite this article

Abstract

Gene transfer to the respiratory epithelium is currently suboptimal and may be helped by the identification of limiting biological barriers. We have, therefore, developed an ex vivo model which retains many of the characteristics of in vivo native airways including mucociliary clearance, mucus coverage and an intact cellular structure. Using this model we have demonstrated several barriers to gene transfer. Liposome-mediated gene transfer was inhibited by normal mucus, with removal of this layer increasing expression approximately 25-fold. In addition both liposome and adenovirus were inhibited by CF sputum. The apical membrane represented a significant barrier to both agents. Adenovirus-mediated expression could be significantly augmented by increasing contact time or by pretreatment of tissues with a nominally calcium-free medium. The presence of these extracellular and plasma membrane barriers appeared to be the key parameters responsible for the approximately three log difference in gene expression found in vitro compared with our ex vivo model. Cytoskeletal elements and the cell cycle also influenced in vitro gene transfer, and represent further barriers which need to be overcome.

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Authors and Affiliations

  1. Ion Transport Unit, Imperial College, National Heart and Lung Institute, London, UK

    C Kitson, B Angel, D Judd, D M Geddes & E W F W Alton

  2. Department of Cardiac Medicine, Imperial College, National Heart and Lung Institute, London, UK

    S Rothery & N J Severs

  3. Electron Microscopy Unit, Royal Brompton Hospital, London, UK

    A Dewar

  4. Department of Pharmacy, University of Pittsburgh, PA, USA

    L Huang

  5. Genzyme Corporation, Framingham, MA, USA

    S C Wadsworth & S H Cheng

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  2. B Angel
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Kitson, C., Angel, B., Judd, D. et al. The extra- and intracellular barriers to lipid and adenovirus-mediated pulmonary gene transfer in native sheep airway epithelium. Gene Ther 6, 534–546 (1999). https://doi.org/10.1038/sj.gt.3300840

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