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Rathmann, S; Keck, C; Kreutz, C; Weit, N; Müller, M; Timmer, J; Glatzel, S; Follo, M; Malkovsky, M; Werner, M; Handgretinger, R; Finke, J; Fisch, P
Bone marrow transplantation (Basingstoke), 08/2017, Volume: 52, Issue: 8Journal Article
Natural killer (NK) cell subpopulations from 8 HLA-matched but killer cell immunoglobulin-like receptor (KIR)/HLA-ligand-mismatched patient-donor pairs were analyzed in the course of allogeneic hematopoietic stem cell transplantation (HCT). The patients' post-transplantation NKG2A /LIR-1 NK cells, which expressed only inhibitory KIRs for which the patient had no HLA class I ligands, showed higher cytotoxic capacity than the NKG2A /LIR-1 NK cells lacking any inhibitory KIRs that remained tolerant throughout the course of HCT. The NKG2A NK cell subpopulations displayed the highest levels of cytotoxic activation, which appeared to be significantly enhanced in comparison with that in allogeneic graft's donors. LIR-1 NK cells were much more frequent after HCT than LIR-1 NK cells and LIR-1 expression on NKG2A or NKG2A NK cells was associated with significantly lower cytotoxic activities. Thus NKG2A /LIR-1 NK cells expressing only HLA-mismatched KIRs show a partial break in tolerance in the first year following HCT. The failure to exclude LIR-1 cells within the NKG2A NK cell subset in previous studies could explain the earlier conflicting results. Thus systemic immune activation in patients following HCT augments the GvL effect through both increasing overall NK cell activities and partially breaking tolerance of unlicensed NK cells.
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