Abstract
A major problem limiting hematopoietic stem cell (HSC) gene therapy is the low efficiency of gene transfer into human HSCs using retroviral vectors. Strategies, which would allow in vivo expansion of gene-modified hematopoietic cells, could circumvent the problem. To this end, we developed a selective amplifier gene (SAG) consisting of a chimeric gene composed of the granulocyte colony-stimulating factor (G-CSF) receptor gene and the estrogen receptor gene hormone-binding domain. We have previously demonstrated that primary bone marrow progenitor cells transduced with the SAG could be expanded in response to estrogen in vitro. In the present study, we evaluated the efficacy of the SAG in the setting of a clinically applicable cynomolgus monkey transplantation protocol. Cynomolgus bone marrow CD34+ cells were transduced with retroviral vectors encoding the SAG and reinfused into each myeloablated monkey. Three of the six monkeys that received SAG transduced HSCs showed an increase in the levels of circulating progeny containing the provirus in vivo following administration of estrogen or tamoxifen without any serious adverse effects. In one monkey examined in detail, transduced hematopoietic progenitor cells were increased by several-fold (from 5% to 30%). Retroviral integration site analysis revealed that this observed increase was polyclonal and no outgrowth of a dominant single clonal population was observed. These results demonstrate that the inclusion of our SAG in the retroviral construct allows selective in vivo expansion of genetically modified cells by a non-toxic hormone treatment.
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Acknowledgements
We thank F Ono, H Narita and K Hanari for handling and care of monkeys. We thank JF Tisdale for critical reading of the manuscript. We are grateful to I Kato for supplying RetroNectin. We acknowledge Nippon Kayaku's supply of toremifene, Amgen's supply of SCF, Ajinomoto's supply of IL-6, Chugai's supply of G-CSF, and Kirin's supply of IL-3 and thrombopoietin. This study was supported by the Ministry of Education, Culture, Sports, Science and Technology of Japan (YH and KO), the Ministry of Health, Labor and Welfare of Japan (KO), CREST of Japan Science and Technology Corporation (KO), Takeda Science Foundation (KO), Japan Medical Association (KO), Yamanouchi Foundation for Research on Metabolic Disorders (KO), Jichi Medical School Young Investigator Award (YH), the Mochida Memorial Foundation for Medical and Pharmaceutical Research (YH), and Senri Life Science Foundation (YH).
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Hanazono, Y., Nagashima, T., Takatoku, M. et al. In vivo selective expansion of gene-modified hematopoietic cells in a nonhuman primate model. Gene Ther 9, 1055–1064 (2002). https://doi.org/10.1038/sj.gt.3301781
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DOI: https://doi.org/10.1038/sj.gt.3301781
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