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Bicistronic retroviral vectors for combining myeloprotection with cell-surface marking

Gene Therapy volume 6, pages 1222–1230 (1999)Cite this article

Abstract

We have developed a retroviral vector coexpressing the multidrug-resistance 1 (MDR1) cDNA for inducing cancer drug resistance and the truncated version of the low-affinity nerve growth factor receptor (ΔLNGFR) for cell-surface marking of transduced cells. The vector is based on the FMEV backbone which mediates high levels of gene expression in hematopoietic cells. To achieve optimal expression levels of both cDNAs, untranslated regions from MDR1 and ΔLNGFR were removed and three different connections were tested: retroviral splice signals, an internal ribosomal entry site (IRES) from encephalomyocarditis virus, and an internal promoter from the chicken β-actin gene. As determined by two-color flow cytometry, the best correlation of the expression of both cDNAs was obtained using the vector SF1mSδ which utilized retroviral splice signals for co-expression. Simultaneous expression of both cDNAs at the single cell level was also shown by confocal laser microscopy. Lymphoid and hematopoietic progenitor cells, including primary human CD34+ cells, transduced with SF1mSδ acquired dominant multidrug resistance. Transduced primary CD34+ cells could be enriched in vitro based on expression of ΔLNGFR, avoiding exposure to cytostatic agents. Thus, monitoring the selection of chemotherapy-resistant cells and analyzing their biological properties may be alleviated, both in vitro and in vivo.

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Acknowledgements

BF, AZ, WO and CB were supported by a grant of the Bundesministerium für Bildung und Forschung (O1KV 9530, 9531, 9811), MH by a grant of the José Carreras Leukemia Fund. We are grateful to B Koch, Boehringer Mannheim, Germany, for providing the biotinylated antibody directed against ΔLNGFR. The Heinrich-Pette-Institut is financially supported by the Freie und Hansestadt Hamburg and the Bundesministerium für Gesundheit, Germany.

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Authors and Affiliations

  1. Department of Cell and Virus Genetics, Heinrich-Pette-Institute for Experimental Virology and Immunology at the University of Hamburg, Hamburg, Germany

    M Hildinger, W Ostertag & C Baum

  2. EUFETS GmbH, Idar-Oberstein, Germany

    A Schilz & H-G Eckert

  3. Department of Tumor Virology, Heinrich-Pette-Institute for Experimental Virology and Immunology, Hamburg University, Germany

    W Bohn

  4. Bone Marrow Transplantation Unit, University Hospital Hamburg-Eppendorf, Hamburg, Germany

    B Fehse & A R Zander

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  1. M Hildinger
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  2. A Schilz
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  4. W Bohn
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  7. W Ostertag
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  8. C Baum
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Hildinger, M., Schilz, A., Eckert, HG. et al. Bicistronic retroviral vectors for combining myeloprotection with cell-surface marking. Gene Ther 6, 1222–1230 (1999). https://doi.org/10.1038/sj.gt.3300942

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