title: Synergistic enhancement of class I major histocompatibility complex antigen expression in K562 cells induced by recombinant human interferon-gamma and tumor necrosis factor in combination.
abstract: The effects of recombinant preparations of human interferon-gamma (rIFN-gamma) and tumor necrosis factor (rTNF), alone or in combination, on class I or class II major histocompatibility complex (MHC) antigen induction were studied using K562, a multipotent hematopoietic precursor cell line. Class I antigens were weakly induced by rIFN-gamma; however, rTNF at any concentration examined (1-1000 U/ml) showed no effect on the induction of class I or class II antigens in the cells. rIFN-gamma (600 U/ml) induced approximately 20% of the cells to express class I antigens after 72-h exposure, whereas 81% of the cells demonstrated class I antigens on their cell surfaces when the cells were simultaneously exposed to 600 U/ml of rIFN-gamma and 1000 U/ml of rTNF. The class II MHC antigens were not induced by the treatments with rIFN-gamma or rTNF, alone or in combination. A synergistic increase of mRNA for class I MHC molecules was demonstrated by treatments of the cells with rIFN-gamma and rTNF in combination. rTNF, but not rIFN-gamma, weakly induced granulocyte-monocyte antigens on the cell surface; however, no synergism was observed on the induction of these antigens by the combined treatments with rIFN-gamma and rTNF. These results indicate that class I MHC antigen expression on K562 cells can be induced by IFN-gamma in cooperation with TNF in a manner different from myeloid antigen expression.
authors.affiliation: Department of Laboratory Medicine, National Defense Medical College, Saitama, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Takemura
authors.forename: Y
authors.initials: Y
authors.lastname: Koide
authors.forename: M
authors.initials: M
authors.lastname: Kawabata
authors.forename: S
authors.initials: S
authors.lastname: Kitajima
authors.forename: C
authors.initials: C
authors.lastname: Ohba
authors.forename: H
authors.initials: H
authors.lastname: Suzuki
authors.forename: S
authors.initials: S
authors.lastname: Sekiguchi
mesh_terms: D004305:Dose-Response Relationship, Drug; D004357:Drug Synergism; D005786:Gene Expression Regulation / Q000187:drug effects; D015395:Histocompatibility Antigens Class I / Q000235:genetics / Q000276:immunology*; D006801:Humans; D066298:In Vitro Techniques; D007371:Interferon-gamma / Q000494:pharmacology*; D007951:Leukemia, Myeloid / Q000473:pathology*; D012333:RNA, Messenger / Q000235:genetics; D011994:Recombinant Proteins; D014407:Tumor Cells, Cultured; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology*
chemical_list: D015395:Histocompatibility Antigens Class I; D012333:RNA, Messenger; D011994:Recombinant Proteins; D014409:Tumor Necrosis Factor-alpha; D007371:Interferon-gamma