title: The cell surface phenotype of human natural interferon-alpha producing cells as determined by flow cytometry.
abstract: The relationship between the so-called natural interferon-alpha (IFN-alpha) producing cell (IPC), stimulated to produce IFN-alpha by herpes simplex virus type 1 (HSV), and of dendritic cells (DC) in peripheral blood leucocytes was investigated. The simultaneous expression of cell surface antigens and intracellular IFN-alpha in the HSV-stimulated IPC (HSV-IPC) was examined by flow cytometry (FCM). The HSV-IPC were infrequent, < 0.3% of the mononuclear leucocytes, and with homogeneous light scatter characteristics. The HSV-IPC were confirmed to lack leucocyte lineage specific markers, and to express CD4, CD36 and HLA-DR. Furthermore, they expressed high levels of CD44, CD45RA and CD45RB, and lower levels of CD40, CD45R0, CD72 and CD83. The HSV-IPC expression of CD13, CD33 and Fc epsilon RI were weak but significant, while no CD5, CD11b, CD16, CD64, CD80 or CD86 were detected. Sorted pure HSV-IPC had irregular shaped nuclei, many mitochondria and vesicles, and rugged cell membranes without veils. Sorted HSV-IPC stimulated proliferation of autologous T cells from HSV immune donors. Thus, the HSV-IPC in many respects resemble immature DC, but clearly differ from typical mature DC. However, they may also represent a specialized population of efficient IFN-alpha producing cells.
authors.affiliation: Department of Veterinary Microbiology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
authors.forename: H
authors.initials: H
authors.lastname: Svensson
authors.forename: A
authors.initials: A
authors.lastname: Johannisson
authors.forename: T
authors.initials: T
authors.lastname: Nikkilä
authors.forename: G V
authors.initials: GV
authors.lastname: Alm
authors.forename: B
authors.initials: B
authors.lastname: Cederblad
mesh_terms: D015703:Antigens, CD / Q000032:analysis; D003713:Dendritic Cells / Q000276:immunology; D005434:Flow Cytometry; D006801:Humans; D016898:Interferon-alpha / Q000096:biosynthesis*; D007963:Leukocytes, Mononuclear / Q000276:immunology*; D008213:Lymphocyte Activation; D010641:Phenotype; D018139:Simplexvirus / Q000502:physiology; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D015703:Antigens, CD; D016898:Interferon-alpha