PMID- 20889923 OWN - NLM STAT- MEDLINE DCOM- 20110414 LR - 20210206 IS - 1528-0020 (Electronic) IS - 0006-4971 (Linking) VI - 117 IP - 3 DP - 2011 Jan 20 TI - Killer Ig-like receptor-mediated control of natural killer cell alloreactivity in haploidentical hematopoietic stem cell transplantation. PG - 764-71 LID - 10.1182/blood-2010-08-264085 [doi] AB - Natural killer (NK) cells are key members of the innate immune system. In a self-environment, they sense and kill target cells lacking major histocompatibility complex class I molecules and release various cytokines on activation. The discovery of human leukocyte antigen (HLA) class I specific inhibitory receptors (including the allotype-specific killer immunoglobulin-like receptors), and of various activating receptors and their ligands, provided the basis for understanding the molecular mechanism of NK-cell activation and function, mainly resulting from the balance between activating and inhibitory signals. In an allogeneic setting, such as T cell-depleted haploidentical hematopoietic stem cell transplantation, NK cells may express inhibitory killer immunoglobulin-like receptors that are not engaged by any of the HLA class I alleles present on allogeneic cells. Such "alloreactive" NK cells greatly contribute both to eradication of leukemia blasts escaping the preparative regimen and to clearance of residual host dendritic cells and T lymphocytes (thus preventing graft-versus-host disease and graft rejection, respectively). Improved prevention of graft-versus-host disease might be achieved by redirecting to lymph nodes adoptively transferred, alloreactive NK cells by inducing CCR7-uptake in vitro. Recent studies suggested that, after immune-suppressive therapy, alloreactive NK cells from an HLA-haploidentical donor may prevent leukemia recurrence also in patients who have not received allogeneic hematopoietic stem cell transplantation. FAU - Moretta, Lorenzo AU - Moretta L AD - Giannina Gaslini Institute, Genova-Quarto, Italy. lorenzomoretta@ospedale-gaslini.ge.it FAU - Locatelli, Franco AU - Locatelli F FAU - Pende, Daniela AU - Pende D FAU - Marcenaro, Emanuela AU - Marcenaro E FAU - Mingari, Maria Cristina AU - Mingari MC FAU - Moretta, Alessandro AU - Moretta A LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review DEP - 20101001 PL - United States TA - Blood JT - Blood JID - 7603509 RN - 0 (HLA Antigens) RN - 0 (Receptors, CCR7) RN - 0 (Receptors, KIR) SB - IM MH - Graft Rejection/immunology MH - Graft vs Host Disease/immunology MH - HLA Antigens/immunology/metabolism MH - Hematopoietic Stem Cell Transplantation/*methods MH - Humans MH - Killer Cells, Natural/*immunology/metabolism MH - Models, Immunological MH - Receptors, CCR7/immunology/metabolism MH - Receptors, KIR/*immunology/metabolism EDAT- 2010/10/05 06:00 MHDA- 2011/04/16 06:00 CRDT- 2010/10/05 06:00 PHST- 2010/10/05 06:00 [entrez] PHST- 2010/10/05 06:00 [pubmed] PHST- 2011/04/16 06:00 [medline] AID - S0006-4971(20)59655-9 [pii] AID - 10.1182/blood-2010-08-264085 [doi] PST - ppublish SO - Blood. 2011 Jan 20;117(3):764-71. doi: 10.1182/blood-2010-08-264085. Epub 2010 Oct 1.