title: Oxidative stress induces the expression of the major histocompatibility complex in murine tumor cells.
abstract: The effect of t-butyl hydroperoxide (t-BOOH) on the induction of the Major Histocompatibility Complex (MHC) class I genes has been studied in two cell clones (B9 and G2) of the methylcholanthrene-induced murine fibrosarcoma GR9. These two clones were selected based on their different biological and biochemical behavior specially related to their tumor induction capability when injected into a BALB/c mouse. t-BOOH (0.125 mM) induced the expression of H-2 molecules in both cell clones. In B9 cell clone, in which MHC basal expression is very low or absent, t-BOOH significantly induced H-2Kd, H-2Dd and H-2Ld molecules. In G2 cell clone the expression of MHC class I genes was also enhanced by the xenobiotic, the effect being especially significant on the H-2Ld molecule which is not expressed under basal conditions. H-2 molecules expression was accompanied by the activation of the transactivator factor NF kappa B. These results suggest that oxidative stress may modulate the antigen expression of tumor cells and thus the immune response of the host organism. Basal levels of oxidative parameters, such as anti-oxidant enzymes, malondialdehyde (MDA) and the DNA damaged base 8-hydroxy-2'-deoxyguanosine (8-OHdG), showed differences between the two fibrosarcoma cell clones.
authors.affiliation: Departamento de Bioquímica y Biología Molecular, Universitat de Valencia.
authors.forename: M R
authors.initials: MR
authors.lastname: Oliva
authors.forename: A
authors.initials: A
authors.lastname: Iradi
authors.forename: F
authors.initials: F
authors.lastname: Garrido
authors.forename: M
authors.initials: M
authors.lastname: Ramos
authors.forename: A M
authors.initials: AM
authors.lastname: Oltra
authors.forename: P
authors.initials: P
authors.lastname: Muñiz
authors.forename: G T
authors.initials: GT
authors.lastname: Sáez
mesh_terms: D016475:3T3 Cells; D000080242:8-Hydroxy-2'-Deoxyguanosine; D000818:Animals; D002374:Catalase / Q000378:metabolism; D003849:Deoxyguanosine / Q000031:analogs & derivatives* / Q000378:metabolism; D024202:Electrophoretic Mobility Shift Assay; D005354:Fibrosarcoma / Q000139:chemically induced / Q000235:genetics / Q000378:metabolism*; D005434:Flow Cytometry; D005786:Gene Expression Regulation / Q000187:drug effects; D005978:Glutathione / Q000378:metabolism; D005979:Glutathione Peroxidase / Q000378:metabolism; D015395:Histocompatibility Antigens Class I / Q000235:genetics / Q000378:metabolism*; D008285:Major Histocompatibility Complex / Q000235:genetics*; D008315:Malondialdehyde / Q000378:metabolism; D008748:Methylcholanthrene / Q000494:pharmacology; D051379:Mice; D008807:Mice, Inbred BALB C; D016328:NF-kappa B / Q000378:metabolism; D018384:Oxidative Stress / Q000187:drug effects; D013482:Superoxide Dismutase / Q000378:metabolism; D014407:Tumor Cells, Cultured; D020122:tert-Butylhydroperoxide / Q000494:pharmacology
chemical_list: D015395:Histocompatibility Antigens Class I; D016328:NF-kappa B; D008315:Malondialdehyde; D008748:Methylcholanthrene; D000080242:8-Hydroxy-2'-Deoxyguanosine; D020122:tert-Butylhydroperoxide; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D003849:Deoxyguanosine; D005978:Glutathione