NK cells expressing inhibitory KIR for non–self-ligands remain tolerant in HLA-matched sibling stem cell transplantation
Natural killer (NK)–cell alloreactivity in recipients of hematopoietic stem cell grafts from HLA-identical siblings is intriguing and has suggested breaking of NK-cell tolerance during the posttransplantation period. To examine this possibility, we analyzed clinical outcomes in a cohort of 105 patie...
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Veröffentlicht in: | Blood 2010-04, Vol.115 (13), p.2686-2694 |
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Sprache: | eng |
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Zusammenfassung: | Natural killer (NK)–cell alloreactivity in recipients of hematopoietic stem cell grafts from HLA-identical siblings is intriguing and has suggested breaking of NK-cell tolerance during the posttransplantation period. To examine this possibility, we analyzed clinical outcomes in a cohort of 105 patients with myeloid malignancies who received T cell–replete grafts from HLA-matched sibling donors. Presence of inhibitory killer cell immunoglobulin-like receptors (KIRs) for nonself HLA class I ligands had no effect on disease-free survival, incidence of relapse, or graft-versus-host disease. A longitudinal analysis of the NK-cell repertoire and function revealed a global hyporesponsiveness of NK cells early after transplantation. Functional responses recovered at approximately 6 months after transplantation. Importantly, NKG2A− NK cells expressing KIRs for nonself HLA class I ligands remained tolerant at all time points. Furthermore, a direct comparison of NK-cell reconstitution in T cell–replete and T cell–depleted HLA-matched sibling stem cell transplantation (SCT) revealed that NKG2A+ NK cells dominated the functional repertoire early after transplantation, with intact tolerance of NKG2A− NK cells expressing KIRs for nonself ligands in both settings. Our results provide evidence against the emergence of alloreactive NK cells in HLA-identical allogeneic SCT. |
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ISSN: | 0006-4971 1528-0020 1528-0020 |
DOI: | 10.1182/blood-2009-07-229740 |