title: Effects of cytokines combined with high-dose gamma irradiation on the expression of major histocompatibility complex molecules and intercellular adhesion molecule-1 in human ovarian cancers.
abstract: Tumor cells from 7 freshly isolated human ovarian tumors and 2 continuous human ovarian cancer cell lines were analyzed for their surface expression of MHC class-1, class 11 and ICAM-1 surface antigens before and after exposure to gamma-irradiation and/or the cytokines TNF-alpha plus IFN-gamma. All 7 fresh tumors expressed high levels of MHC class 1 and 1CAM-1 antigens, and levels were markedly up-regulated after exposure to TNF-alpha plus IFN-gamma Similarly, class-11 antigens were either induced (3 out of 7 tumors) or significantly up-regulated by TNF-alpha plus IFN-gamma. Exposure to high doses of gamma-irradiation also increased the expression of MHC class-1 and ICAM-1 antigens, albeit to a modest degree. MHC class 1 and ICAM-1 antigens expression was much lower on continuous human ovarian cell lines than on the fresh tumors. Exposure of these cells to TNF-alpha plus IFN-gamma markedly up-regulated antigen expression to levels comparable to those expressed on the freshly isolated tumors. With the established ovarian cell lines, removal of cytokines caused a rapid down-regulation of antigen expression to basal levels within 6 days, while in the fresh tumors a low level of up-regulation was still present at this time. In contrast, exposure to cytokines followed by high-dose gamma-irradiation resulted in a highly significant and long-lasting expression of each surface antigen which was either up-regulated or induced by the cytokines. These data indicated that the combination of these modalities may be beneficial in generating optimal antigen expression for use of tumor cells in vaccine studies.
authors.affiliation: Department of Molecular Biology and Biochemistry, University of California, Irvine 92717, USA.
authors.forename: A D
authors.initials: AD
authors.lastname: Santin
authors.forename: G S
authors.initials: GS
authors.lastname: Rose
authors.forename: J C
authors.initials: JC
authors.lastname: Hiserodt
authors.forename: J
authors.initials: J
authors.lastname: Fruehauf
authors.forename: L M
authors.initials: LM
authors.lastname: Eck
authors.forename: R I
authors.initials: RI
authors.lastname: Garcia
authors.forename: V
authors.initials: V
authors.lastname: Schranz
authors.forename: P J
authors.initials: PJ
authors.lastname: Disaia
authors.forename: S
authors.initials: S
authors.lastname: Pecorelli
authors.forename: G A
authors.initials: GA
authors.lastname: Granger
mesh_terms: D000230:Adenocarcinoma / Q000276:immunology / Q000378:metabolism*; D005260:Female; D005720:Gamma Rays; D015395:Histocompatibility Antigens Class I / Q000378:metabolism*; D006801:Humans; D018799:Intercellular Adhesion Molecule-1 / Q000378:metabolism*; D007371:Interferon-gamma / Q000494:pharmacology*; D010051:Ovarian Neoplasms / Q000276:immunology / Q000378:metabolism*; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology*
chemical_list: D015395:Histocompatibility Antigens Class I; D014409:Tumor Necrosis Factor-alpha; D018799:Intercellular Adhesion Molecule-1; D007371:Interferon-gamma