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In vitro gene targeting in human Hepatoblastoma

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Abstract

Poor treatment results in advanced hepatoblastoma (HB) made alternative treatment approaches desirable. Gene-directed tumor therapy is increasingly investigated in different malignancies. The aim of this study was to analyze possible alternatives of gene transfer into HB cells and to study therapeutic applications based on different strategies. Liposomal transfection of HB cells was assessed using liver-specific promoters, and adenovirus and Sendai virus transductions were performed in vitro. Transfer efficiencies were measured via flow cytometry determining expression of vector-encoded marker gene green fluorescent protein. Gene silencing of the anti-apoptotic bcl-2 gene in HUH6 cells was performed using lipofection of small interfering RNA (siRNA). Additionally, suicide gene therapy was carried out through a yeast-derived cytosine deaminase (YCD)-combined yeast uracil phosphoribosyltransferase (YUPRT)-based adenovirus-mediated gene transfer, leading to a potent intracellular prodrug transformation of 5-fluorocytosine into 5-fluorouracil. Treatment efficiencies were monitored via MTT viability assay. Highest gene transfer rates (86%) were observed using adenovirus transduction. We furthermore observed a significant therapeutic effect of adenovirus-mediated YCD::YUPRT suicide gene transfer. Liposomal-mediated anti-bcl-2 siRNA transfer led to a significant improvement of cisplatin treatment in HUH6 cells. Liver-specific promoters were found to be strongly active in HUH6 cells (mixed HB-derived), but less active in HepT1 cells (embryonal HB-derived). Liposomal transfection and viral transduction are effective approaches to genetically manipulate HB cells in vitro. For the first time, we demonstrate a positive effect of siRNA gene silencing in this malignancy. Additionally, we successfully investigated a model of adenovirus-based suicide gene therapy in HB cell cultures. Our data strongly encourage further studies assessing these alternative treatment approaches.

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Authors and Affiliations

  1. Department of Pediatric Surgery, University of Tübingen, Hoppe-Seyler-Street 3, 72076, Tübingen, Germany

    Steven W. Warmann, Heike Frank, Heike Buck, Heike Heitmann, Guido Seitz & Jörg Fuchs

  2. Department of Internal Medicine I, Medical University Clinic, Otfried-Müller-Street 10, 72076, Tübingen, Germany

    Sorin Armeanu, Florian Graepler, Marie-Luise Lemken, Ulrich M. Lauer & Michael Bitzer

Authors
  1. Steven W. Warmann
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  2. Sorin Armeanu
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  3. Heike Frank
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  4. Heike Buck
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  5. Florian Graepler
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  6. Marie-Luise Lemken
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  7. Heike Heitmann
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  8. Guido Seitz
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  9. Ulrich M. Lauer
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  10. Michael Bitzer
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  11. Jörg Fuchs
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Correspondence to Steven W. Warmann.

Additional information

Steven W. Warmann and Sorin Armeanu contributed equally to this work.

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Warmann, S.W., Armeanu, S., Frank, H. et al. In vitro gene targeting in human Hepatoblastoma. Ped Surgery Int 22, 16–23 (2006). https://doi.org/10.1007/s00383-005-1573-8

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  • DOI: https://doi.org/10.1007/s00383-005-1573-8

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