Abstract
Proto-oncogene activation caused by retroviral vector integration can cause malignancies in gene therapy trials. This has led investigators to search for less genotoxic vectors with minimal enhancer activity and a decreased risk of influencing neighboring chromosomal gene expression after integration. We previously showed that foamy virus (FV) vectors expressing the canine CD18 gene from an internal murine stem cell virus (MSCV) promoter could cure canine leukocyte adhesion deficiency (LAD). Here, we have repeated these studies using a FV vector expressing canine CD18 from a phosphoglycerate kinase (PGK) gene promoter. In vitro analysis showed that this vector did not contain an enhancer that activated neighboring genes, and it expressed CD18 efficiently in canine neutrophils and CD34+ cells. However, dogs that received hematopoietic stem cells transduced with the PGK-CD18 vector continued to suffer from LAD, and sometimes died prematurely of the disease. These studies show that the PGK promoter cannot effectively replace the MSCV promoter in CD18-expressing FV vectors, and they suggest that vectors containing a strong promoter–enhancer may be necessary for the treatment of human LAD.
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Acknowledgements
This research was supported by US National Institutes of Health grants HL53750 and HL085107 and the Intramural Research Program of the US National Institutes of Health, National Cancer Institute, Center for Cancer Research. We thank Raisa Stolitenko for technical assistance, William Telford and Veena Kapoor for help with flow cytometry, and Dennis Hickstein for support and advice.
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Bauer, T., Olson, E., Huo, Y. et al. Treatment of canine leukocyte adhesion deficiency by foamy virus vectors expressing CD18 from a PGK promoter. Gene Ther 18, 553–559 (2011). https://doi.org/10.1038/gt.2010.169
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DOI: https://doi.org/10.1038/gt.2010.169
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