title: [Immunohistochemical detection of c-myc proto-oncogene products in middle ear cholesteatoma].
abstract: Cholesteatoma epithelium is characterised by a keratinocyte dysregulation with a hyperproliferative growth and altered differentiation. In a variety of cells c-myc oncogene was found to be highly linked to the control of growth and differentiation. The expression of c-myc was studied in cholesteatoma epithelium using a monoclonal antibody directed against the 67 kD c-myc protein product and the alkaline phosphatase-anti-alkaline phosphatase-method. Furthermore for quantitative analysis we used a computer aided analysing system. In contrast to normal skin the keratinocytes of suprabasal layers showed a nuclear staining in cholesteatoma epithelium. The incidence of nuclear stainings of epithelial cells in cholesteatoma was significantly increased. Simultaneously, cytoplasmatic staining was observed in both skin and cholesteatoma with a stronger reactivity in the latter. Our findings suggest a participation of the c-myc oncogene in the reported dysregulation of cholesteatoma epithelium.
authors.affiliation: Ludwig-Maximilians-Universität München, Klinik und Poliklinik für Hals-, Nasen-Ohrenkranke.
authors.forename: A
authors.initials: A
authors.lastname: Holly
authors.forename: M
authors.initials: M
authors.lastname: Sittinger
authors.forename: J
authors.initials: J
authors.lastname: Bujía
mesh_terms: D001706:Biopsy; D002454:Cell Differentiation / Q000235:genetics*; D002455:Cell Division / Q000235:genetics*; D018424:Cholesteatoma, Middle Ear / Q000235:genetics* / Q000473:pathology; D004424:Ear Canal / Q000473:pathology; D004848:Epithelium / Q000473:pathology; D006801:Humans; D007124:Immunoenzyme Techniques; D000090063:Proto-Oncogene Mas; D016271:Proto-Oncogene Proteins c-myc / Q000235:genetics*
chemical_list: C000715470:MAS1 protein, human; D000090063:Proto-Oncogene Mas; D016271:Proto-Oncogene Proteins c-myc
vernacular_title: Immunhistochemischer Nachweis von C-MYC-Protooncogen-Produkten im Mittelohrcholesteatom.