title: Regulatory role of NKp44, NKp46, DNAM-1 and NKG2D receptors in the interaction between NK cells and trophoblast cells. Evidence for divergent functional profiles of decidual versus peripheral NK cells.
abstract: During the first trimester of pregnancy NK cells represent >50% of the lymphoid cells present in the human decidua where they reside in close contact with trophoblast cells. Because in decidual tissues NK cell activation and function may be induced by this interaction, we analyzed the cellular ligands recognized by activating NK receptors expressed on trophoblast cells. We show that these cells primarily express the NKp44 and DNAM-1 ligands and that interaction between these ligands and their corresponding receptors results in NK cell triggering. While activated peripheral blood NK (pNK) cells lysed the trophoblast cell lines JAR and JEG3, decidual NK (dNK) cells did not. On the other hand, they released VEGF, SDF-1, IP10 and large amounts of IL-8. Interaction with K562 target cells was exploited to induce optimal NK cell triggering, allowing a parallel, quantitative assessment of both cytolytic activity and cytokine production elicited by dNK cells. While dNK cells were unable to kill K562 even at high effector:target (E:T) ratios, they released large amounts of IL-8 also at low E:T ratios, a scenario compatible with dNK trophoblast cells interaction occurring within decidual tissues.
authors.affiliation: Dipartimento di Medicina Sperimentale, Università degli Studi di Genova, Genova, Italy.
authors.forename: Paola
authors.initials: P
authors.lastname: Vacca
authors.forename: Claudia
authors.initials: C
authors.lastname: Cantoni
authors.forename: Carola
authors.initials: C
authors.lastname: Prato
authors.forename: Ezio
authors.initials: E
authors.lastname: Fulcheri
authors.forename: Alessandro
authors.initials: A
authors.lastname: Moretta
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Moretta
authors.forename: Maria Cristina
authors.initials: MC
authors.lastname: Mingari
mesh_terms: D000945:Antigens, Differentiation, T-Lymphocyte / Q000378:metabolism*; D002450:Cell Communication; D016207:Cytokines / Q000378:metabolism; D003601:Cytotoxicity Tests, Immunologic; D003656:Decidua / Q000166:cytology; D005260:Female; D006801:Humans; D020014:K562 Cells; D007694:Killer Cells, Natural / Q000166:cytology / Q000378:metabolism*; D008213:Lymphocyte Activation; D016131:Lymphocyte Subsets / Q000166:cytology / Q000378:metabolism*; D055655:NK Cell Lectin-Like Receptor Subfamily K / Q000378:metabolism*; D055627:Natural Cytotoxicity Triggering Receptor 1 / Q000378:metabolism*; D055629:Natural Cytotoxicity Triggering Receptor 2 / Q000378:metabolism*; D011247:Pregnancy; D014327:Trophoblasts / Q000166:cytology / Q000276:immunology / Q000378:metabolism*; D042461:Vascular Endothelial Growth Factor A / Q000378:metabolism; D000098862:T Lineage-Specific Activation Antigen 1
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D000098862:T Lineage-Specific Activation Antigen 1; D016207:Cytokines; C527085:KLRK1 protein, human; C112260:NCR1 protein, human; C112837:NCR2 protein, human; D055655:NK Cell Lectin-Like Receptor Subfamily K; D055627:Natural Cytotoxicity Triggering Receptor 1; D055629:Natural Cytotoxicity Triggering Receptor 2; C467484:VEGFA protein, human; D042461:Vascular Endothelial Growth Factor A