title: Natural killer cell proliferation induced by anti-NK1.1 and IL-2.
abstract: NKR-P1 molecules are involved in natural killing of certain tumour targets. Indeed, the NK1.1 (NKR-P1C) molecule is the most specific serological marker on murine NK cells in C57BL/6 mice. Previous studies of NKR-P1 have indicated that anti-NKR-P1 mAb induced NK cells to kill otherwise insensitive targets, NK cell phosphoinositol turnover and Ca++ flux but it was not previously known if all NK cells were activated. In this study we report that immobilized anti-NK1.1 also specifically induced proliferation as measured by thymidine incorporation. The response required low doses of IL-2 for a synergistic effect. Cells stimulated with anti-NK1.1 + IL-2 displayed characteristic cytolytic activity against a NK-sensitive tumour target, YAC-1. However, anti-NK1.1-stimulated cells displayed delayed proliferation kinetics, heterogeneity of the expression of the very early antigen marker, CD69, and altered expression of the Ly-49 family members when compared to NK cells activated by high concentrations of IL-2. Taken together, these data demonstrate that immobilized anti-NK1.1 triggers only a subpopulation of NK cells.
authors.affiliation: Department of Pediatrics, Washington University School of Medicine, St Louis, Missouri 63110, USA.
authors.forename: A
authors.initials: A
authors.lastname: Reichlin
authors.forename: W M
authors.initials: WM
authors.lastname: Yokoyama
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology*; D015703:Antigens, CD / Q000378:metabolism; D000945:Antigens, Differentiation, T-Lymphocyte / Q000378:metabolism; D000950:Antigens, Ly / Q000187:drug effects / Q000276:immunology; D000954:Antigens, Surface / Q000276:immunology*; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D006224:Cricetinae; D003602:Cytotoxicity, Immunologic / Q000187:drug effects*; D005434:Flow Cytometry; D006801:Humans; D007376:Interleukin-2 / Q000494:pharmacology*; D007694:Killer Cells, Natural / Q000166:cytology / Q000187:drug effects* / Q000276:immunology; D037181:Lectins, C-Type; D051379:Mice; D008810:Mice, Inbred C57BL; D055651:NK Cell Lectin-Like Receptor Subfamily B; D051381:Rats; D011971:Receptors, Immunologic / Q000276:immunology / Q000502:physiology; D011994:Recombinant Proteins / Q000494:pharmacology; D013997:Time Factors; D000099192:CD69 Antigens
chemical_list: D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D000945:Antigens, Differentiation, T-Lymphocyte; D000950:Antigens, Ly; D000954:Antigens, Surface; D007376:Interleukin-2; D037181:Lectins, C-Type; D055651:NK Cell Lectin-Like Receptor Subfamily B; D011971:Receptors, Immunologic; D011994:Recombinant Proteins; D000099192:CD69 Antigens; C527203:KLRB1 protein, human; C527211:Klrb1c protein, mouse