Abstract
Using an experimental mouse model, we have investigated the kinetics of hematopoietic reconstitution of recipients transplanted during fetal development with fresh and transduced hematopoietic stem cells (HSCs). Total bone marrow (BM) and purified Lin−Sca-1+ cells, either fresh or transduced ex vivo with enhanced green fluorescent protein (EGFP)-encoding retroviral vectors, were in utero transplanted (IUT) into fetal mice. Data obtained 2 months after transplantation showed a similar proportion of engrafted animals, regardless of the fact that samples were purified or not on HSCs, and subjected or not to ex vivo transduction with retroviral vectors. The transplantation of grafts enriched in HSCs, either fresh or transduced, always improved the levels of donor chimerism of IUT mice in comparison with results obtained in mice transplanted with unpurified BM grafts (6.8 and 7.3% versus 1.15% median values, respectively). Significantly, engrafted recipients that were transplanted with the transduced graft always contained transduced EGFP+ cells in peripheral blood (around 5% of donor cells were EGFP+ at 2 months post-transplantation). This proportion was essentially maintained at longer times post-transplantation, as well as in secondary recipients transplanted with the BM of IUT mice. Our study describes for the first time a significant and stable engraftment of unconditioned mice subjected to IUT with HSCs transduced with retroviral vectors.
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Acknowledgements
The authors thank A Flake and S Satoshi for essential advices and help in establishing the in utero transplantation technique in our laboratory; to I Ormán for expert handling the flow cytometer, S Moreno for her help with the artwork, and E López, ML López and A de Lacal for technical assistance. This work was partially supported by grants SAF2001-0682-C02-01 and SAF2002-03234 from the Comisión Interministerial de Ciencia y Tecnología and from the Health Program of the European Union FPVI.
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Rio, P., Martinez-Palacio, J., Ramirez, A. et al. Efficient engraftment of in utero transplanted mice with retrovirally transduced hematopoietic stem cells. Gene Ther 12, 358–363 (2005). https://doi.org/10.1038/sj.gt.3302419
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DOI: https://doi.org/10.1038/sj.gt.3302419