Abstract
Canine leukocyte adhesion deficiency (CLAD) provides a unique large animal model for testing new therapeutic approaches for the treatment of children with leukocyte adhesion deficiency (LAD). In our CLAD model, we examined two different fragments of the human elongation factor 1α (EF1α) promoter (EF1αL, 1189 bp and EF1αS, 233 bp) driving the expression of canine CD18 in a self-inactivating (SIN) lentiviral vector. The EF1αS vector resulted in the highest levels of canine CD18 expression in CLAD CD34+ cells in vitro. Subsequently, autologous CD34+ bone marrow cells from four CLAD pups were transduced with the EF1αS vector and infused following a non-myeloablative dose of 200 cGy total-body irradiation. None of the CLAD pups achieved levels of circulating CD18+ neutrophils sufficient to reverse the CLAD phenotype, and all four animals were euthanized because of infections within 9 weeks of treatment. These results indicate that the EF1αS promoter-driven CD18 expression in the context of a RRLSIN lentiviral vector does not lead to sufficient numbers of CD18+ neutrophils in vivo to reverse the CLAD phenotype when used in a non-myeloablative transplant regimen in dogs.
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Acknowledgements
This research was supported by the Intramural Research Program of the NIH, National Cancer Institute, Center for Cancer Research. We thank William Telford and Veena Kapoor, NCI, for assistance with flow cytometry.
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Nelson, E., Tuschong, L., Hunter, M. et al. Lentiviral vectors incorporating a human elongation factor 1α promoter for the treatment of canine leukocyte adhesion deficiency. Gene Ther 17, 672–677 (2010). https://doi.org/10.1038/gt.2010.7
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DOI: https://doi.org/10.1038/gt.2010.7
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