Abstract
T cell depletion using the murine monoclonal antibody (moAb) T10B9 is unique in that the T cell receptor (TCR)γδbearing subset is relatively spared compared to the TCRαβ+ subset. We evaluated the probabilities of engraftment, acute and chronic graft-versus-host disease (GVHD), relapse, and survival in 273 recipients of marrow T cell depleted using T10B9. Sixty-two patients received marrow from an HLA-identical sibling, 54 patients received partially matched related donor marrow and 157 patients received unrelated donor marrow. Limiting dilution analysis (LDA) was used to estimate total clonable T cell dose in all patients and a modified LDA using moAb-coated immunomagnetic beads was used to estimate TCRαβ+, CD4+ and CD8+ T cells in a subset of patients. TCRγδ+ cell dose was estimated by flow cytometry. Cox proportional hazards regression models were used to assess the impact of T cell subset dose/kg of body weight on outcome. We found a significant association of TCRγδ+ T cell dose (P = 0.004), but not TCRαβ+ T cell dose or total clonable T cell dose, with the probability of engraftment. TCRαβ+, CD4+, CD8+ and total clonable T cell dose were significantly associated (P < 0.001) with the risks of grade 2–4 acute gvhd in recipients of marrow from related donors but not in recipients of marrow from unrelated donors. neither total clonable t cell dose nor any t cell subset dose was found to be significantly associated with chronic gvhd, relapse or survival. the results confirm preclinical studies showing tcrγδ+ T cells promote engraftment. TCRγδ+ T cells are not associated with an increased risk of acute GVHD while TCRαβT cells are associated with acute GVHD but not engraftment in recipients of marrow grafts T cell depleted using T10B9. These findings support the hypothesis that T cell subsets differentially contribute to alloengraftment and GVHD.
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Kawanishi, Y., Passweg, J., Drobyski, W. et al. Effect of T cell subset dose on outcome of T cell-depleted bone marrow transplantation. Bone Marrow Transplant 19, 1069–1077 (1997). https://doi.org/10.1038/sj.bmt.1700807
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DOI: https://doi.org/10.1038/sj.bmt.1700807
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