title: Immune response in lymphocyte cultures stimulated by oral bacteria preparations.
abstract: Lymphocyte cultures were used as an in vitro experimental model to get a deeper insight into immune response to oral bacteria in periapical granulomas. Lymphocytes isolated from leucocyte concentrate were in lymphocyte cultures stimulated by antigen preparations of oral bacteria. Lymphocyte subsets that have developed in lymphocyte cultures after a week of stimulation were analysed by flow cytometry. A significant increase in expression of INF-gamma molecules in CD3+ cells stimulated by antigen preparations of oral streptococci was found, compared with negative control. On the other hand we observed a significant increase in expression of IL-4 in CD3+ cells stimulated by antigens of anaerobic bacteria, compared with negative control. Our results show that antigens of oral streptococci in in vitro lymphocyte cultures induce the differentiation of T helper cells into Th2 cells and that antigen preparations of anaerobic bacteria induce the differentiation of T helper cells into Th1 cells. Furthermore, an increased expression of HLA-DR molecules on CD8+ T cells stimulated by antigens of oral streptococci was found, compared with negative control.
authors.affiliation: Institute Jozef Stefan, Ljubljana, Slovenia.
authors.forename: N
authors.initials: N
authors.lastname: Vardjan
authors.forename: A N
authors.initials: AN
authors.lastname: Kopitar
authors.forename: N
authors.initials: N
authors.lastname: Ihan Hren
authors.forename: T
authors.initials: T
authors.lastname: Malovrh
authors.forename: B
authors.initials: B
authors.lastname: Wraber
authors.forename: A
authors.initials: A
authors.lastname: Ihan
mesh_terms: D000917:Antibody Formation; D001421:Bacteria, Anaerobic / Q000276:immunology*; D017252:CD3 Complex / Q000032:analysis; D016827:CD8 Antigens / Q000032:analysis; D002478:Cells, Cultured; D005434:Flow Cytometry; D006684:HLA-DR Antigens / Q000378:metabolism; D006801:Humans; D007371:Interferon-gamma / Q000378:metabolism; D015847:Interleukin-4 / Q000378:metabolism; D016131:Lymphocyte Subsets / Q000276:immunology; D008214:Lymphocytes / Q000276:immunology* / Q000382:microbiology*; D009055:Mouth / Q000382:microbiology*; D013291:Streptococcus / Q000276:immunology*
chemical_list: D017252:CD3 Complex; D016827:CD8 Antigens; D006684:HLA-DR Antigens; D015847:Interleukin-4; D007371:Interferon-gamma