title: Regulation of a graft-versus-leukemia effect by major histocompatibility complex class II molecules on leukemia cells: HLA-DR1 expression renders K562 cell tumors resistant to adoptively transferred lymphocytes in severe combined immunodeficiency mice/nonobese diabetic mice.
abstract: To understand the role of key molecules in determining the strength and nature of allogeneic T-cell response to leukemia, we transfected HLA-DR1 into the major histocompatibility complex (MHC)-deficient, natural killer (NK)-cell sensitive K562 leukemia cell line. Untransfected K562 cells stimulated NK proliferation in vitro and formed subcutaneous tumors in severe combined immunodeficiency/non-obese diabetic (SCID/NOD) mice. Tumor growth was inhibited by adoptive intravenous transfer of fresh unprimed peripheral blood mononuclear cells (PBMC). In contrast, HLA-DR1 transfected cells stimulated CD4(+) T cells, but not NK-cell proliferation in vitro and formed tumors resistant to fresh PBMC in SCID/NOD mice. Tumors not expressing MHC were infiltrated with CD16(+)CD56(+) lymphocytes whereas nonregressing HLA-DR1 expressing tumors showed only a scanty infiltration with both T-cell and NK-cell subsets. The results indicate that MHC class II expression by leukemia cells can determine the effector cell type that it engages. In vivo MHC class II expression rendered K562 cell tumors resistant to NK-cell mediated antitumor reactivity.
authors.affiliation: Bone Marrow Transplantation Unit, Hematology Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA.
authors.forename: F F
authors.initials: FF
authors.lastname: Weichold
authors.forename: Y Z
authors.initials: YZ
authors.lastname: Jiang
authors.forename: D E
authors.initials: DE
authors.lastname: Dunn
authors.forename: M
authors.initials: M
authors.lastname: Bloom
authors.forename: V
authors.initials: V
authors.lastname: Malkovska
authors.forename: N F
authors.initials: NF
authors.lastname: Hensel
authors.forename: A J
authors.initials: AJ
authors.lastname: Barrett
mesh_terms: D019264:Adoptive Transfer; D000818:Animals; D003602:Cytotoxicity, Immunologic; D006087:Graft vs Host Reaction / Q000276:immunology*; D015798:HLA-DR1 Antigen / Q000378:metabolism*; D006801:Humans; D007694:Killer Cells, Natural / Q000276:immunology; D008214:Lymphocytes / Q000276:immunology; D051379:Mice; D016688:Mice, Inbred NOD; D016513:Mice, SCID; D014162:Transfection; D014407:Tumor Cells, Cultured
chemical_list: D015798:HLA-DR1 Antigen