Abstract
We have investigated the feasibility and efficacy of large-scale T cell depletion from granulocyte colony- stimulating factor (G-CSF) mobilized peripheral blood stem cells (PBSC). The method is based on the use of a CD3 antibody conjugated to magnetic microbeads and magnetic activated cell sorting (Clinimacs). A total of eight large-scale experiments were performed. In four experiments, CD3+ T cells were depleted from PBSC obtained from volunteers mobilized with G-CSF whereas, in four experiments, T cells were depleted from PBSC from stem cell donors, in which the CD34+ stem cells had been removed for allogeneic transplantation by positive selection prior to T cell depletion. The mean number of processed mononuclear cells (MNCs) was 3.3 × 1010 (range 1.5 × 1010–5.1 × 1010) with a mean T cell proportion of 35.8% (range 16.7–64.0%). After T cell depletion, the percentage of contaminating T cells was 0.15% (range 0.01–1.01%) with a mean log10 depletion of 3.4 (range 2.8–4.1). The mean recovery of CD3-negative MNCs after depletion was 76% (range 52–100%). The mean recovery of CD34+ stem cells in the four evaluable experiments was 82% (range 75–92%). In vitro colony assays and in vivo NOD/SCID repopulation assays showed that this large-scale T cell depletion method has no negative impact on the function of the hematopoietic precursor cells. Therefore, we conclude that this T cell depletion method is a valuable tool for further graft engineering strategies involving mobilized PBSCs.
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Gordon, P., Leimig, T., Mueller, I. et al. A large-scale method for T cell depletion: towards graft engineering of mobilized peripheral blood stem cells. Bone Marrow Transplant 30, 69–74 (2002). https://doi.org/10.1038/sj.bmt.1703619
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DOI: https://doi.org/10.1038/sj.bmt.1703619
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