title: FcgammaRIII expression on cultured human keratinocytes and upregulation by interferon-gamma.
abstract: Keratinocytes of human epidermis are actively involved in inflammatory and autoimmune reactions of the skin and interact with resident or infiltrating immunocompetent cells via cytokines, chemokines, and intercellular adhesion mechanisms. Most immunocompetent cells have been reported to express Fcgamma receptors (FcgammaR), which are important for immunoregulatory functions. In this study we investigate FcgammaRIII expression on cultured human keratinocytes and upregulation by interferon-gamma. By real-time polymerase chain reaction, we show basal mRNA expression of both subclasses FcgammaRIIIA and FcgammaRIIIB, but after interferon-gamma treatment mRNA of FcgammaRIIIA and FcgammaRIIIB is increased 4.4 and 6.5 times, respectively. FcgammaRIII protein expression and its increase after interferon-gamma treatment were shown on cultured human keratinocytes by indirect immunofluorescence. In immunoblotting experiments, a bonified anti-CD16 antibody revealed reactivity to a polypeptide of 50-65 kDa on lysates of treated and untreated keratinocytes. In summary, we demonstrate expression of mRNA specific for the FcgammaRIIIA and FcgammaRIIIB subclasses and their upregulation by interferon-gamma on human keratinocytes in vitro, and confirm FcgammaRIII protein expression by indirect immunofluorescence and by immunoblotting experiments.
authors.affiliation: Department of Dermatology, Division of General Dermatology, University of Vienna, School of Medicine, Austria. karlacauza@hotmail.com
authors.forename: Karla
authors.initials: K
authors.lastname: Cauza
authors.forename: Andreas
authors.initials: A
authors.lastname: Grassauer
authors.forename: Gabriele
authors.initials: G
authors.lastname: Hinterhuber
authors.forename: Reinhard
authors.initials: R
authors.lastname: Horvat
authors.forename: Klemens
authors.initials: K
authors.lastname: Rappersberger
authors.forename: Klaus
authors.initials: K
authors.lastname: Wolff
authors.forename: Dagmar
authors.initials: D
authors.lastname: Foedinger
mesh_terms: D000328:Adult; D000906:Antibodies; D015703:Antigens, CD / Q000032:analysis / Q000235:genetics; D000970:Antineoplastic Agents / Q000494:pharmacology*; D002478:Cells, Cultured; D019084:Fluorescent Antibody Technique, Indirect; D058851:GPI-Linked Proteins; D015870:Gene Expression / Q000187:drug effects; D006801:Humans; D007371:Interferon-gamma / Q000494:pharmacology*; D015603:Keratinocytes / Q000737:chemistry / Q000166:cytology / Q000502:physiology*; D012333:RNA, Messenger / Q000032:analysis; D017452:Receptors, IgG / Q000032:analysis / Q000235:genetics* / Q000276:immunology; D015854:Up-Regulation / Q000187:drug effects
chemical_list: D000906:Antibodies; D015703:Antigens, CD; D000970:Antineoplastic Agents; C428200:FCGR3B protein, human; D058851:GPI-Linked Proteins; D012333:RNA, Messenger; D017452:Receptors, IgG; D007371:Interferon-gamma