title: Expression of the HLA-C2-specific activating killer-cell Ig-like receptor KIR2DS1 on NK and T cells.
abstract: Killer Ig-like receptors (KIRs) are MHC class I-specific receptors expressed by Natural Killer (NK) and T cell subsets. KIRs either inhibit (KIR-L) or activate (KIR-S) lymphocyte functions. Inhibitory KIR2DL1 and activating KIR2DS1 share ligand specificity for the HLA-C2 group, consistent with their almost identical extracytoplasmic domain. This homology hampered the distinction between KIR2DL1 and KIR2DS1. We report here the characterization of the KIR2DS1(+) subsets among primary human NK and T cells. Regardless of the host HLA-C genotype, around 10% of circulating NK cells expressed KIR2DS1 in absence of KIR2DL1. In HLA-C2 individuals, KIR2DS1 was not able to induce NK cell education (i.e., the acquisition of NK cell competence) nor to interfere with KIR2DL1-induced NK cell education. KIR2DS1 was also present on rare oligoclonal TCRalphabeta(+)CD8alpha(+) and TCRalphabeta(+)CD4(-)CD8(-) subsets. As KIR2DS1 has been associated with autoimmunity and hematopoietic stem cell transplantation, these results pave the way to dissect the function of KIR2DS1 in these clinical conditions.
authors.affiliation: Centre d'Immunologie de Marseille-Luminy, Université de la Méditerranée, case 906, Campus de Luminy, 13288 Marseille, France.
authors.forename: Céline
authors.initials: C
authors.lastname: Cognet
authors.forename: Catherine
authors.initials: C
authors.lastname: Farnarier
authors.forename: Laurent
authors.initials: L
authors.lastname: Gauthier
authors.forename: Coralie
authors.initials: C
authors.lastname: Frassati
authors.forename: Pascale
authors.initials: P
authors.lastname: André
authors.forename: Aude
authors.initials: A
authors.lastname: Magérus-Chatinet
authors.forename: Nicolas
authors.initials: N
authors.lastname: Anfossi
authors.forename: Frederic
authors.initials: F
authors.lastname: Rieux-Laucat
authors.forename: Eric
authors.initials: E
authors.lastname: Vivier
authors.forename: Nicolas
authors.initials: N
authors.lastname: Schleinitz
mesh_terms: D000818:Animals; D002460:Cell Line; D004247:DNA / Q000737:chemistry / Q000235:genetics; D005434:Flow Cytometry; D005838:Genotype; D015236:HLA-C Antigens / Q000276:immunology*; D006801:Humans; D007694:Killer Cells, Natural / Q000276:immunology*; D007963:Leukocytes, Mononuclear / Q000276:immunology; D008213:Lymphocyte Activation / Q000276:immunology; D051379:Mice; D054340:Receptors, KIR / Q000096:biosynthesis* / Q000235:genetics / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D015236:HLA-C Antigens; C496212:KIR2DS1 protein, human; D054340:Receptors, KIR; D004247:DNA