title: Interferon-gamma can augment expression ability of HLA-DR antigens on pokeweed mitogen-stimulated human T lymphocytes.
abstract: The effect of natural interferon (IFN)-gamma on HLA-DR molecule expression of pokeweed mitogen (PWM)-stimulated T cells from cord blood and adult peripheral blood was assessed by direct immunofluorescence with fluorescein-labeled monoclonal anti-HLA-DR antibody on a flow cytometer. Although cord blood T cells showed only weak expression of HLA-DR antigens on PWM stimulation, IFN-gamma could enhance HLA-DR expression of PWM-stimulated cord blood T cells to levels comparable to those of adult ones. A similar, but slight, increase in HLA-DR expression was inducible in PWM-stimulated adult T cells by the addition of IFN-gamma, but at higher doses. This increased expression of HLA-Dr antigens on PWM-stimulated T cells was almost completely abolished by both acid treatment of IFN-gamma and neutralization of IFN-gamma with specific antiserum. In contrast to IFN-gamma, neither recombinant IFN-alpha nor IFN-beta showed any effect on HLA-DR expression of PWM-stimulated T cells. These results suggested a possible function of IFN-gamma that might modulate HLA-DR expression ability of T cells in their activation process.
mesh_terms: D000328:Adult; D002455:Cell Division; D002478:Cells, Cultured; D005260:Female; D005312:Fetal Blood / Q000276:immunology; D005802:Genes, MHC Class II; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II / Q000032:analysis*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007371:Interferon-gamma / Q000276:immunology*; D008213:Lymphocyte Activation; D008297:Male; D009500:Neutralization Tests; D011043:Pokeweed Mitogens; D011247:Pregnancy; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II; D011043:Pokeweed Mitogens; D007371:Interferon-gamma